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P0300 Diagnostic Trouble Code Discussion for April 2010

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
2005 Chevrolet Aveo LT 1.6L Poor Idle Quality, Surge, MIL Lamp on, Idle flactuates VIN: KL1TG52615
P0300: Engine Misfire Detected. Vehicle came in with busted timing belt and shewed up idler pulley, Obviously, all the valve bent on the cylinder head. After installing a good used cylinder head (had about 70K miles on the used cyl.head), new timing kit (with tensioner and idler pulley, and...
April 01, 2010
2004 Mazda 6 S 3.0L Misfire, MIL Lamp on VIN: 1YUP82D6Y5
P0300: Random Misfire Detected. "ever since" we installed a front crank seal, there has been misfire codes. Stared with po300 and po303. We replaced spark plugs and 3 coils (rear bank under plenum). Now we get only a po300, and it sets when vehicle is over 3000 rpm, only when driven ...
April 01, 2010
1996 Porsche 911 Carrera 3.6L Misfire, MIL Lamp on VIN: WPOAA2997T
P0300: random misfire. This car sets misfire codes repeatedly. always occurs at about 50-60 mph, 4th gear, light throttle(5-7%), 3200-3400 RPM,fuel trims near zero. The car had 30K service. We have changed plugs, plug wires, caps, rotors, coils and checked distributor belt, Cylinder...
April 01, 2010
2000 Volvo V70 2.4L Misfire, MIL Lamp on VIN: YV1LW61J7Y
P0300: random misfire. wiered one for you. We want to see if anybody else has seen this spark plug issue. Back in may of '08 we did a 120k mile service and we used O.E. plugs #8642660. Car drove fine untill August of '08 when it came back in with a missfire. Turns out that #2 cyl pl...
April 01, 2010
2002 Dodge Intrepid SE 2.7L Misfire
P0300: Multiple Cylinder Misfire Detected. I scanned the vehicle and found a po300 code,but when i road tested it there was no missfire.I road tested it again and it did missfire but only on cyl #1-3-5 bank one.I have seen this on GM trucks before,and it was the up stream o2 on that bank.The other shop...
April 03, 2010
1997 Ford Escort LX 2.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3FALP15P4V
P0300: random misfire. cust. comes in complaining of no power and SES light on. a quick scan shows misfires cyls. #1 & 4. cust said same problem happened 1-2 weeks ago, stopped a "another shop" and they told him to change plugs and wires. He went home and changed plugs o...
April 03, 2010
1997 Dodge Caravan LE 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 14E3456786
P0300: Multiple Cylinder Misfire Detected. I everyone, I had this van come in with a few small oil leaks that the customer wanted fixed, so I replaced the lower intake gasket, valve cover gaskets, and the upper intake plentum gasket. I started the vehicle and let it run on idle for about 30 minutes and...
April 04, 2010
2002 Hyundai Elantra GLS 2.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: KMHDN45D42
P0300: Multiple Misfire Detected. This one is a 'lunch-eater' that we've got over 7 hours in to no avail. Vehicle idles roughly, has no power or acceleration, and only intermitently sets codes. Step on the accelerator at idle and it takes 5-10 seconds for engine to wind-up---just like a plugge...
April 05, 2010
2003 Mazda 6 S 3.0L Surge, Misfire VIN: 1YVHP80D63
P0300: Random Misfire Detected. any help starting me in the right direction would help dont work on to many mazdas car has a miss when driving at higher rpms..check engine light flashes..it starts smoking(white smoke) it starts backfiring through the intake..i waswill check compression and f...
April 05, 2010
2001 Audi S4 2.7L MIL Lamp on VIN: WAURD68D31
P0300: random misfire. Vehicle arrived with engine light on. Scanned on generic side of computer and pulled po300 code. Eurpoean side of computer had po300, po304, po305 and po431. Replaced spark plugs and ignition coils for cylinder 4, 5, and 6. Swaped the two ignition modules on t...
April 06, 2010
2003 Mazda 6 S 3.0L Surge, Misfire VIN: 1YVHP80D63
P0300: Random Misfire Detected. any help starting me in the right direction would help dont work on to many mazdas car has a miss when driving at higher rpms..check engine light flashes..it starts smoking(white smoke) it starts backfiring through the intake..i waswill check compression and f...
April 06, 2010
2000 Mercedes-Benz CL500 5.0L Misfire VIN: WDB2153752
P0300: Ignition missfire. G,day everyone, we have a lovely cl500 in our workshop which we require help with. Anything over half throttle engine missfires and will not rev over 3000rpm. We have downloaded fault codes which indicate cyls 1,2,3,4 (right bank) missfiring. We have replaced ...
April 06, 2010
2002 Porsche Boxster Roadster 2.7L Poor Idle Quality, Misfire VIN: WP0CA29832
P0300: Random misfire. ... states ran fine, and was parked in the garage. They came out later and the vehicle started and ran rough for a few sec and stalled. Would't restart. I got vehicle held petal to floor and engine started - but only ran on three cylinders. Checked with temp ...
April 06, 2010
2006 Audi A4 2.0L Misfire VIN: WAUAF78E86
P0300: Random Misfire. This car has a a misfire on #4 cylinder but only after a 10 - 15 min hot soak. The dealer has installed a ECU due to no injector pulse on 2 injectors, the customer only drove car about 1 week and had misfire at times- so dealer removed intake manifold and clea...
April 07, 2010
2004 Chevrolet Silverado 3500 WT 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GBJC34U84
P0300: Multiple Engine Misfire Detected. hi all, truck came in with misfire code, hooked up tech2 pulled po300, checked misfire monitor, miss on #s 3-4, pulled plugs on those cylinders, they are new no cracks. check for vacuum leaks with carb cleaner none found.switched wires,coils,plugs,injectors, m...
April 07, 2010
2005 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, MIL Lamp on VIN: 1GNDT13S15
P0300: Multiple Engine Misfire Detected. ... control solenoid rusted. The question I have is & research has not produced the answer is this: if the AIR control solenoid shorts, will it casue an erratic idle (P0300- scanner showing random missfires on all cylinders) and a tach that jumps around wi...
April 07, 2010
2006 Dodge Charger SXT 3.5L Misfire, MIL Lamp on VIN: 2B3KA43G6H
P0300: Multiple Cylinder Misfire. Vehicle came in with check engine light on and codes PO300, PO302 active. Performed motorvac service after inspecting plug, coil, and boot on #2 cyl.vehicle went one day and code came back on. Swapped spark plug, injector, coil from #2 cyl. with #4 cyl. one pi...
April 07, 2010
2001 Volkswagen Passat GLX 2.8L Misfire, MIL Lamp on VIN: WVWRH53B91
P0300: random mis. hello all . this vehichle came in with all of these misfire codes . o.e. plugs/wires at 113000. replaced plugs wires , cmp sensor . started engine , c4mis code . swapped wires, plugs , injectors . still c4mis . good compression on all . checked timing belt mar...
April 07, 2010
2006 Audi A4 2.0L Misfire VIN: WAUAF78E86
P0300: Random Misfire. This car has a a misfire on #4 cylinder but only after a 10 - 15 min hot soak. The dealer has installed a ECU due to no injector pulse on 2 injectors, the customer only drove car about 1 week and had misfire at times- so dealer removed intake manifold and clea...
April 08, 2010
2006 Chevrolet Silverado 1500 LS 5.3L Misfire, MIL Lamp on VIN: 2GCEK13T46
P0300: Multiple Cylinder Misfire Detected. truck came in with misfire cust wanted plugs and wires. installed plugs & wires still has misfire on #6 cylinder only. only skips at idle runs good off ilde it is idleing at 650. swapped coil and injector, fuel pressure is 63 psi, vaccum is 19, long term f...
April 08, 2010
2001 GMC Safari SLT 4.3L Poor Idle Quality, Cuts out VIN: 1GKDM19W21
P0300: Multiple Cylinder Misfire Detected. Vehicle came in with complaint of hesitation, basically when you step on the gas it cuts out like its starving for fuel. While its doing this the fuel pressure is @ 47-50 psi...I couldn't find a running fuel pressure spec. KoEo is 60-66psi. The vehicle came in...
April 08, 2010
2002 Kia Sedona EX 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: KNDUP13142
P0300: Multiple Misfire Detected. Van has poor idle quality under 1000 rpm. Load it and take it over 1000 rpm and smooths out. Runs great at freeway speed. Will only throw codes at stop light. I think maybe timing belt off a bit, or tensioner is bad, or has bad crank sensor, but no code for cr...
April 09, 2010
2000 Ford Expedition XLT 4.6L Misfire VIN: 1FMRU1660Y
P0300: random misfire. ... book since day 1. came in with p0306. replaced coil, road tested, misfire again, p0306. replaced #6 plug with autolite platinum and the just changed coil, road tested and again p0306. removed the new coil on # 6 and swapped #1 and # 6 coils (# 1 was easies...
April 10, 2010
2002 Chevrolet Suburban 1500 LT 5.3L Misfire VIN: 3GNFK16TX2
P0300: Multiple Cylinder Misfire Detected. ... #5 / #4 (only set mil p0305 / p0300). raise rpm up and miss goes away and some engine noise appears(from where i dont know yet, kinda have a metronome beat at idle too) Customer replaced coil wireset and plugs. Az double p...
April 12, 2010
2003 Jaguar S-Type 4.2L MIL Lamp on VIN: SAJEA01U43
P0300: misfire. Hello all. This s-type has misfire faults for all cylinders except 7 & 8 and the map sensor circuit fault. Has anyone seen this on one of these normally aspirated 4.2's ? would just throw a MAP sensor on it and see, but it is an ugly job and the customer i...
April 13, 2010
2002 GMC Yukon Denali 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKFK66U92
P0300: Multiple random misfire. what i noticed though is only when the car is idling at 560 rpm it starts to mis and as soon as you step on the gas a little the mis disappears and the idle goes to 6xx rpm, and stays there for about a solid min or so, then back down to 560 and the mis retuns....
April 15, 2010
2003 GMC Savana 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTHG39U13
P0300: Multiple Cylinder Misfire Detected. vehicle came in with random miss fire... when you start the car cold it runs fine after van warms up the right bank(cylinders 2-4-6-8) start missing.. good compression good spark to all cylinders.. tried swapping the injectors for the other side no difference....
April 16, 2010
2001 Mercury Sable LS 3.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1MEFM55511
P0300: random misfire. hello this is my first posting i hope someone can help me with this one.customer brought in this vehicle said it struges to stay running.at first when i started the vehicle the idle went up to 2000 rpm for about 4 seconds and then dropped to undre 500 rpm and ...
April 16, 2010
2001 Volkswagen Passat GLX 4 Motion 2.8L Misfire VIN: WVWTH63B41
P0300: random misfire. This passat came in from a differnt local shop. They replaced wires, plugs, injector on cyl 3. When the car first came in I check injector pulse, spark, did a compression test 175 and a leakdown 0%. We also check belt timing with the (real tools) fuel pressure...
April 16, 2010
1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Surge VIN: 1GNDT13W3T
P0300: Multiple Cylinder Misfire Detected. I am looking for some help with this fuel system. Running very rich at idle and off idle. When I first check fuel preasre it was right at 53-55 and would bleed off slowly when stopped. I cleared codes nd was only able to confirm the multi cly misfire. i suspec...
April 18, 2010
2000 Nissan Quest GXE 3.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1NOTSURE23
P0300: Multiple Misfire Detected. ... had this van come in for a CEL on and running rough. I checked the tune up items first and found it in need.The original codes were p0300 and 306. After tuning the vehicle up clearing codes and computer fuel trims I test ...
April 18, 2010
2001 Porsche 911 Carrera 3.4L Misfire, Vibration VIN: WPOCA29941
P0300: random missfire- fuel system. car starts and idles smoothly. runs fine to just above 3000 rpm, then vibrates, makes strange sounds out exhaust and looses power till below 3000 rpm. then smooth running. sometimes it will continue to miss on one or two clyinders untill switched off and resta...
April 19, 2010
2000 Chevrolet Express 1500 5.0L Misfire, MIL Lamp on VIN: 1GBFG15M7Y
P0300: Multiple Cylinder Misfire Detected. This truck came in with a misfire code p0300 checked misfire data and found it was misfiring on cyl# 5 we found good spark but the new spark plug was fouled out with fuel.( customer replaced cap, rotor, wires, and plugs ) We replaced the injector assy and and ...
April 20, 2010
1999 Lexus RX300 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: JT6HF10V4X
P0300: random miss fire. We had customer drop off there new vehical here with ses light on . We checked codes and found tons of codes from miss fire to vvt codes. We cleared them and they came back after a short test drive. We notice car ran rough from time to time. We have concluded ...
April 20, 2010
2004 Mazda Miata 1.8L MIL Lamp on VIN: JM1NB35344
P0300: Random Misfire Detected. Car came in with a code P0300. Customer stated MIL comes on and flashes at times but ran fine. I have test driven multiple times and usually have the same thing happen within a few miles. I have never felt the engine misfire, yet the light will suddenly start ...
April 20, 2010
2000 Nissan Quest GXE 3.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1NOTSURE23
P0300: Multiple Misfire Detected. ... had this van come in for a CEL on and running rough. I checked the tune up items first and found it in need.The original codes were p0300 and 306. After tuning the vehicle up clearing codes and computer fuel trims I test ...
April 20, 2010
1998 Ford Explorer XLT 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FMZU34E5W
P0300: Random missfire. Here we are with this Explorer, was in other shop with the same codes, they replaced the coil and performed a full tune up, nothing changed. I did a leak down test to make sure the head gasket is ok since i see in the scanner misfire at cylinder #4 the most th...
April 21, 2010
2004 Mazda Miata 1.8L MIL Lamp on VIN: JM1NB35344
P0300: Random Misfire Detected. Car came in with a code P0300. Customer stated MIL comes on and flashes at times but ran fine. I have test driven multiple times and usually have the same thing happen within a few miles. I have never felt the engine misfire, yet the light will suddenly start ...
April 21, 2010
2002 Porsche Boxster Roadster 2.7L Poor Idle Quality, Misfire VIN: WP0CA29832
P0300: Random misfire. ... states ran fine, and was parked in the garage. They came out later and the vehicle started and ran rough for a few sec and stalled. Would't restart. I got vehicle held petal to floor and engine started - but only ran on three cylinders. Checked with temp ...
April 21, 2010
2000 Volkswagen Passat GLS 1.8L Misfire, MIL Lamp on VIN: WVWNA23BXY
P0300: Multi-Cylinder Misfire detected. Ever get that car that just won't go away? You know the one that came in looking like you'd FINALLY make a couple dollars on and it ends up COSTING you about $3,700.99??? This is it: 2000 VW Passat. We put a timing belt and water pump (had to remove the ENTIRE...
April 21, 2010
1997 Chevrolet Express 1500 4.3L No Start, Hesitation, MIL Lamp on VIN: 1GCFG15W5V
P0300: Multiple Cylinder Misfire Detected. It also had a code p0420 cat eff. It had this pile of codes in it so i cleared and po340 keeps returning i think i should get that problem first.Owner said doesn't start sometime.I put a new delphi pump in at his request back in January.of course it has starte...
April 22, 2010
1998 Ford Explorer XLT 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FMZU34E5W
P0300: Random missfire. Here we are with this Explorer, was in other shop with the same codes, they replaced the coil and performed a full tune up, nothing changed. I did a leak down test to make sure the head gasket is ok since i see in the scanner misfire at cylinder #4 the most th...
April 22, 2010
2004 GMC Savana 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GDHG31U04
P0300: Multiple Cylinder Misfire Detected. ... man lift up a long 3 mile hill this van started loosing power and missing badly. He managed to make it to his service call with the CEL blinking all the way. He stopped by for me to do a quick look over to see if it was something simple. I hooked it up on ...
April 24, 2010
2006 GMC Envoy SLE 4.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GKET16S46
P0300: Multiple Engine Misfire Detected. Good morning, I have an '06 Envoy here that when cold intermittently it will stall, no power, backfire in intake, misfire, MIL illuminated. Here is the story, the MIL has been illuminated for over a year, she has had the vehicle to several places who accordin...
April 26, 2010
2005 Saturn Ion-1 2.2L Hesitation, Cuts out, MIL Lamp on VIN: 1G8AM12F35
P0300: Random Misfire Detected. This vehicle has an intermittent miss which feels like an ignition misfire or a lockup converter chugging around 80 , we have done the most common tests and component replacements on it. It's still missing. When the problem occurs, the check engine light flash...
April 26, 2010
1998 GMC Sonoma SL 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTCS1445W
P0300: Multiple Engine Misfire Detected. Hello fellow IATN members. 2 brand new coils, no spark to cylinder 1 and 4 from corresponding coil. cylinder 2 and 3 are fine. Tryed different PCM from junk yard with no luck. Is there something that I am overlooking. I am assuming that the crank shaft positio...
April 27, 2010
2001 Honda Passport LX 3.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 456CK58W11
P0300: Random Misfire Detected. ... with lean rich codes.p0172, p0174 p0175. i spayed around intake and i found a leaky intake and replce gaskets along with spark plugs. Then it was sent out, but two days later the car came back with the same problem flashing ...
April 27, 2010
1996 Pontiac Grand Am SE 2.4L No Start, Misfire, MIL Lamp on VIN: 1G2NE52TXT
P0300: Multiple Cylinder Misfire Detected. I have a 96 Pontiac Grand Am that came in on a hook. customer says stalled out and would not start back up heard loud clunk. I Checked Timing chain ans tensioners ok. Disconnected module and started car would cranks just fine without the clunk. As soon as I ho...
April 27, 2010
2001 Honda Passport LX 3.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 456CK58W11
P0300: Random Misfire Detected. ... with lean rich codes.p0172, p0174 p0175. i spayed around intake and i found a leaky intake and replce gaskets along with spark plugs. Then it was sent out, but two days later the car came back with the same problem flashing ...
April 28, 2010
2005 Volvo XC90 2.5T 2.5L No Start VIN: YV1CZ59215
P0300: Random misfire. This vehicle was towed in, customer drove about 1 block from house, died while driving. Has no fuel pressure before fuel filter, or at fuel rail. Has spark at coil and inj. pulse. We can hear the fuel pump run, but no/zero pressure. We understand that this veh...
April 28, 2010
2001 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54K91
P0300: Multiple Engine Misfire Detected. I have a mis-fire on number 6 cylinder only at idle. It will set a code in about 5 minutes. I have swaped plug, ign. wire, ign. coil and fuel injector from oposite bank with no change. Have cleaned EGR valve and replaced intake manifold gaskets and plenium gas...
April 29, 2010
2007 GMC Sierra 1500 Classic SL 4.8L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GTEC19V97
P0300: Multiple Cylinder Misfire Detected. Help just had a customer drop off his truck, wont idle and stalls,has misfire on scan tool cyl 1,3 and [...] or 8 but mainly 1&3 assumed cat was plugged pulled 02 was quick and easy ,not the problem, plugs baddly fouled plugs had replaced them first, same ...
April 29, 2010
2000 Toyota Tundra 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5TBJN3217Y
P0300: Multiple Cylinder Misfire Detected. Trk came back this am with misfires in all cyl.@ idle or on decel in park and sitting in shop.drivaibility is fine on streets or freeway.
April 29, 2010
2005 Volvo XC90 2.5T 2.5L No Start VIN: YV1CZ59215
P0300: Random misfire. This vehicle was towed in, customer drove about 1 block from house, died while driving. Has no fuel pressure before fuel filter, or at fuel rail. Has spark at coil and inj. pulse. We can hear the fuel pump run, but no/zero pressure. We understand that this veh...
April 29, 2010
2007 GMC Sierra 1500 Classic SL 4.8L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GTEC19V97
P0300: Multiple Cylinder Misfire Detected. Help just had a customer drop off his truck, wont idle and stalls,has misfire on scan tool cyl 1,3 and [...] or 8 but mainly 1&3 assumed cat was plugged pulled 02 was quick and easy ,not the problem, plugs baddly fouled plugs had replaced them first, same ...
April 30, 2010
2002 Toyota 4Runner SR5 3.4L MIL Lamp on VIN: JT3GN86R52
P0300: Multiple Cylinder Misfire Detected. After doing tune up, vehicle came back with same codes. It is picking up misfire on cyl. 1 on computer but can not feel skip. Rechecked coil and it was fine. Checked cam and crank signals and are good. Did compression check both running and cranking are fine. ...
April 30, 2010