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P0300 Diagnostic Trouble Code Discussion for April 2007

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
2002 Kia JOICE 2.0L Excessive Emissions, Poor Idle Quality, Misfire VIN: KMXMTE1PP2
P0300: Random Misfire Detected. This vehicle came in with this DTC P0300,after clearing did test drive and under load the MIL came on with the same DTC.Checked the fuel pump pressure got 40 Psi also in the test drive - so,it's not part of the fuel system. On the FF data I could not see any r...
April 01, 2007
2000 Nissan Frontier SE 3.3L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on
P0300: Multiple Misfire Detected. misses at idle seems to mbe #2 and #4/SMOKE TEST ON MANIFOLD ,NO LEAKS/ COMPRESSION GOOD CRANKING AND RUNNING/WE RESET ALL BASE SETTINGS (TIMING/IDLE/TPS) TIMING MARKS ARE GOOD
April 02, 2007
1998 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: R1W1174063
P0300: Multiple Cylinder Misfire Detected. vehicle came in because it runs rough. has misfire code stored. cap, rotor, fuel filter have been replaced by us due to wear and age. someone has has replaced fuel pump twice, CPI unit, plugs and wires. misfire comes and goes as it pleases and it is always on ...
April 03, 2007
2003 Chevrolet Express 2500 4.8L Misfire, MIL Lamp on VIN: 1GCGG25V23
P0300: Multiple Cylinder Misfire Detected. Here's one for the books. This van has a misfire on #3 and #1 cylinders at idle until around 2000rpm. #3 misfires a lot more than #1 cylinder. The misfire counter goes to 0 between 1800 to 2000 rpm. We swapped the plugs, coil packs with the cylinders that don'...
April 03, 2007
2004 Ford Ranger XL 3.0L Poor Idle Quality, Misfire, MIL Lamp on
P0300: Multiple Misfire. Hi Guys, This Ranger is driving me nuts. Getting a constant engine light ONLY at idle. Misfire codes. Then, I can drive the vehicle and the codes and engine light will go out! When it goes back to idle, it's very rough and you'll eventually get a regular misf...
April 03, 2007
1998 Honda Passport EX 3.2L Hesitation, Stall, MIL Lamp on VIN: 4S6CM58W1W
P0300: Random Misfire Detected. car came in with no power and check engine light on . pulled codes found misfire po300 po157 02 sig low b2s2 p1171 sys lean on accel. cust has replaced maf,3 COILS ON B2,6 PLUGS ALLO FOUR O2 . FUEL PSI 38 AT IDLE UNDER ACCEL 42 PSI COMP 130 TO 140 ON ALL 6 CYL...
April 03, 2007
1996 Chevrolet Cavalier Z24 2.4L Misfire, MIL Lamp on VIN: 1G1JF12T1T
P0300: Multiple Engine Misfire Detected. ... 2.4 quad that is driving me crazy car will run great sometimes for hours or days then out of the blue starts misfiring backfiring pooring black smoke then next time you start engine it may run fine or not. ckp \cmp signal ok codes p0171 lean bank 1\p0300 m...
April 04, 2007
1996 Chrysler Town & Country (Van) 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1C4GP54L1T
P0300: . hi guys. I got this van in this morning coming from another shop. they have replaced plugs and wires but the van kept misfiring with Check engine light on code P0205 for number 5 injector circuit. the power and pulse are both good on number 5 injector. i did a...
April 05, 2007
2003 Hummer H2 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5GRGN23U23
P0300: Multiple Cylinder Misfire Detected. well guys i need help with another head scratcher! this vehicle has multiple mis-fires on all the cylinders on the left bank. but only under load. at idle it only has mis-fire on cylinder #1. i've tried plugs and wires, i've switched coils and injectors, teste...
April 05, 2007
1998 Honda Passport EX 3.2L Hesitation, Stall, MIL Lamp on VIN: 4S6CM58W1W
P0300: Random Misfire Detected. car came in with no power and check engine light on . pulled codes found misfire po300 po157 02 sig low b2s2 p1171 sys lean on accel. cust has replaced maf,3 COILS ON B2,6 PLUGS ALLO FOUR O2 . FUEL PSI 38 AT IDLE UNDER ACCEL 42 PSI COMP 130 TO 140 ON ALL 6 CYL...
April 09, 2007
1996 Nissan Quest GXE 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 4N2DN11W7T
P0300: Multiple Misfire Detected. ... illuminated MIL (P0300-random misfire) running ok on cold start-up. After the vehicle runs for about twenty minutes it starts misfiring and running terrible. After the vehicle cools dwon and is re-started it will run great again but for only 20 minutes. Th...
April 09, 2007
2003 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GKFK16Z03
P0300: Multiple Cylinder Misfire Detected. ... check engine light on, when we checked codes, there were none, howevewr the vehicle was idling poorly, and the battery wwas bad. we replaced the battery and test drove and the code p0300 came up. The vehicle had never been tuned so we recomended hthat firs...
April 10, 2007
1997 Cadillac DeVille 4.6L Misfire VIN: 1G6KD54Y6V
P0300: Engine Misfire Detected. Vehicle came in for misfire & engine light, retrieved code PO300 -Misfire is ONLY in cylinder #1 fuel pressure at specs, no vacuum leaks found -after checking voltages determined needed to replaced fuel injector, plugs & Wires - problem fixed??- sent v...
April 11, 2007
1997 Chrysler Sebring LX 2.5L Misfire, MIL Lamp on VIN: 1CDGJDOT65
P0300: Multiple Cylinder Misfire Detected. replace dist. fuel pressure ok very intermitent doesnt matter hot or cold, po300 random miss. Back fire runs rough.wires new plugs new fuel filter new now what? come on chr. techs help.
April 11, 2007
1995 Chevrolet S10 LS 4.3L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCCS19Z3S
P0300: Random Missfire. ... The customer changed IAC, TPS, O2, no change. I pluged in my scan tool (Mastertech) and noticed iregular data stream, like system voltage droping to 2.4v or a RPM reeding of 99999, and code 55 amoung others. I checked all powers and grounds, and all the so...
April 12, 2007
1997 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Hesitation, Misfire VIN: 1GNEK13R3V
P0300: Multiple Cylinder Misfire Detected. HI guys I got one here that the miss just wont go away. MIL light is on, scanned for codes got a PO300 and it was clear that #5 was the big problem. did an injector balance test and all of them dropped to around 45psi after a starting point of 60psi. checked #...
April 14, 2007
1997 Pontiac Grand Prix SE 3.8L Poor Idle Quality, Misfire, MIL Lamp on, LEAN VIN: 1G2WJ52K8V
P0300: Multiple Engine Misfire Detected. ... that came in with a code p0300 random misfire only at idle mostly cyl 3 and 4 original plugs and wires with very large gap changed plugs wires rotated inj to see if it was an inj changed intake checked the upper plenum changed lifters per other iatn hints ...
April 14, 2007
1997 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD52YXV
P0300: Engine Misfire Detected. Hello Cadillac gurus, I need some help. This car is eating my paycheck for the last week. Came in with a misfire on #6 cylinder. Did tuneup and fuel injection service, replaced fuel injector-still misfires. Replaced intake gaskets-still same misfire on #6. Swa...
April 15, 2007
1997 Chevrolet Cavalier 2.2L Misfire, MIL Lamp on VIN: 1G1JC5243V
P0300: Multiple Engine Misfire Detected. this is my daughterts car that i put a motor in thanksgiving of 05. has been runnig great until a month ago when it started missing on 2 cyls [comp data said 1&3]does not miss at any set time temp or load . ONE time when it was missing I was able to find t...
April 18, 2007
2002 Jaguar X-Type 3.0L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: SAJEA51C4Z
P0300: misfire. this vehicle came into the shop with misfire codes on drivers bank,rough run and some engine noise. found fuel in oil& fouled plugs.checked compression(fine) replace fuel fouled plugs,changed oil,cleared codes. on road test ran fine at first and then same ...
April 18, 2007
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13S22
P0300: Multiple Engine Misfire Detected. Hello all. I have a good one for you GM techs out there. This 2002 Trailblazer came in for bogging down at idle and client feels engine miss. The misfire counter on the Modis counts up and then resets on cylinders 3 and 4. We replaced the spark plugs and boots...
April 19, 2007
1999 Saab 9-3 2.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: YS3DD55N8X
P0300: . Scan data appears normal as compared to another 99 9-3 that runs ok. I'm leaning tword an ignition module. My experience with these cars indicates when the module acts up, they just quit. We do know until it goes "closed-loop" the engine won't idle we...
April 19, 2007
2000 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 1GCEK19T7Y
P0300: Multiple Cylinder Misfire Detected. yesterday this truck had a hard miss mainly on #5,7 cylinder and they were getting spark I switched injectors around and no change. did compression check and 150psi. check back pressure on exhaust and under .5 psi. fuel pressure regulator is not leaking. but f...
April 20, 2007
1999 Mercedes-Benz ML320 3.2L Misfire, MIL Lamp on VIN: 4JGAB54E3X
P0300: random misfire detected. ... no power,mill on.Check code:P0300,P0301,P0302, P0303,P0304,P0305,P0306.Check fuel pressure--OK,replace air filter,replace spark plugs and wires/w check cyl. compression---OK,check for stack open EGR valve---OK, Check exhau...
April 20, 2007
1999 Saab 9-3 2.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: YS3DD55N8X
P0300: . Scan data appears normal as compared to another 99 9-3 that runs ok. I'm leaning tword an ignition module. My experience with these cars indicates when the module acts up, they just quit. We do know until it goes "closed-loop" the engine won't idle we...
April 20, 2007
1996 Chrysler Sebring JX 2.5L Misfire, MIL Lamp on VIN: 3C3EL45H1T
P0300: Multiple Cylinder Misfire Detected. This vehicle has an intermentant p0300 missfire codes in the computer that will not act up for us. The Customer says it only comes on the highway at a steady speed but does not feel a miss. Also the light goes out on its own before bringing it to the garage. T...
April 25, 2007
2000 Lexus LX470 4.7L Misfire VIN: JT6HT00W3Y
P0300: Multiple Cylinder Misfire Detected. Has anybody had random/multiple cylinder and specific cyl misfire experience with this type vehicle? Relatively new Iridium plugs and one recent coil replacement (now gone bad after 6 months). Any help/insight and time savings is greatly appreciated. Sincere...
April 25, 2007
1999 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNEK13R5X
P0300: Multiple Cylinder Misfire Detected. Performed complete tune up at 73,000 to solve engine miss, replace plugs, wires, cap, rotor, filters etc..., problem still exists and according to customer getting worse, have since had a MotorVac injection system cleaning done, no change, now at 81,000 we see...
April 27, 2007
1999 Ford F-250 Super Duty Lariat 5.4L No Start VIN: 1FTNX20L6X
P0300: Random Misfire Detected. ... you leave the key on for about a minute then crank it and it starts up fine and runs normally, it does have an intermittent misfire on cyl #6 and codes P0300, p0306. During cranking the scanner displays 0 rpm, I believe the...
April 27, 2007