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P0300 Diagnostic Trouble Code Discussion for August 2007

Multiple Misfire Detected


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Trouble Ticket Help Requests for DTC P0300
Help Request Posted
1997 Cadillac DeVille 4.6L No Start VIN: 166KD5ZY5V
P0300: Engine Misfire Detected. I'm playin clean-up batter on this one. The other tech checked codes, replaced all in related repairs. I reset anti-theft, due to battery being replaced and cleaned grounds and powers. The cranks and runs for 3 seconds and dies and will do the same many times....
August 01, 2007
1999 GMC K1500 Sierra SLE 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTEK19R1X
P0300: Multiple Cylinder Misfire Detected. Please Help!!! I have worked on this vehicle 3 times now for the same complaint. When the vehicle first came in it had been at three other shops.The customer told me that the vehicle had been tuned up, had the intake gasket replaced, a new fuel filter, an inje...
August 01, 2007
1997 Cadillac DeVille 4.6L No Start VIN: 166KD5ZY5V
P0300: Engine Misfire Detected. I'm playin clean-up batter on this one. The other tech checked codes, replaced all in related repairs. I reset anti-theft, due to battery being replaced and cleaned grounds and powers. The cranks and runs for 3 seconds and dies and will do the same many times....
August 02, 2007
2004 Dodge Ram 1500 Truck ST 4.7L Misfire, MIL Lamp on VIN: 1D7HA18NX4
P0300: Multiple Misfire Detected. ... truck came in with check engine light on for misfire on number 2 cyl. and a genral misfire code p0300. i pulled the plug out and it was the oem plug so a chaged all 8 and put in a new coil on number 2. drove the truck with no problems found. a week later t...
August 02, 2007
2000 Ford F-250 Super Duty Lariat 6.8L Surge VIN: 1FTNW21S5Y
P0300: Random Misfire Detected. this thing has a very rough idle and a bad surge, customer stated that it started after went to jiffy lube and they did a crank case flush, smoked system for leaks ok, scan data short term fuel trim on both banks is +33, long term fuel trim stays at zero, bank...
August 02, 2007
2001 Pontiac Grand Am GT 3.4L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2NV52E71
P0300: Multiple Cylinder Misfire Detected. Calling all Pontiac techs. Car came in a month ago for a crank no start. Tessted for injector pulse and had none. Found passlock sensor bad as well as ignition switch. Replaced both did the 10 min. relearn and all was well. Now car is back as a crank no start ...
August 02, 2007
2004 Nissan Sentra SE-R 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3N1AB51D94
P0300: Multiple Misfire Detected. Hello fellow Nissan Tech's. I have a 04 Sentra SE-R Spec V here that is having some difficulty's. Has very poor idle quality, and will at times stall, i replaced the crank position sensor for the crank code that it was throwing and that code has not since came...
August 04, 2007
2002 Toyota Sienna LE 3.0L Misfire, MIL Lamp on VIN: 4T3ZF13C9Z
P0300: Multiple Cylinder Misfire Detected. This one has me stumped. It is definitely misfiring and it shows on the Toyota scanner. The STFT on bank 2 is -20% at idle and -5% to -6% at 2500 rpm. Bank 1 trims are near 0. The plugs show signs of over fueling. The Bank 2 VVT never shows to activate like th...
August 06, 2007
2000 Chevrolet S10 2.2L Misfire, MIL Lamp on VIN: 1GCCS1446Y
P0300: Multiple Engine Misfire Detected. Hi All, I have this 2.2l S-10 here, Customer states started missing and shaking on freeway. Had it towed in here. Found # 2 and 3 cylinders not firing, no spark. Swaped wires, no change. # 2 and 3 share the same coil pack, so I swapped coil packs, no change, s...
August 07, 2007
2004 Chevrolet Express 2500 LS 6.0L Misfire VIN: 1GCGG25U64
P0300: Multiple Cylinder Misfire Detected. vehicle came in because it was running very poorly at idle. we took it for a test drive and it sounded like it may have a burnt exhaust valve. did a compression test and a cylinder leak down test but everything checked out ok (sorry i don't have exact readings...
August 07, 2007
2005 Jeep Grand Cherokee Limited 5.7L Hesitation, MIL Lamp on VIN: 1J8HR58235
P0300: Multiple Cylinder Misfire Detected. This car shows (on the Starscan) a constant missfire on cylinder 2&3, random missfires on the other cylinders. This engine runs smooth and has plenty of power. The car also-seems like mostly during warmup-buck. This is when the code p0339 is set. The p0335...
August 07, 2007
2002 Chevrolet Express 1500 4.3L Misfire, MIL Lamp on, MULTIPAL CODES VIN: 1GCFG15W32
P0300: Multiple Cylinder Misfire Detected. ... mph - 45 mph when accelerating setting both codes p0101 and p0300. same results when both upstream o2 sensors pulled. when fails- freeze frame loads 40 map hg 27.8 rpm 2045 maf gm/sec 67 speed 44 egr volt .73 egr pos 0 baro volt 4.73 a/f ratio 14.6 baro ...
August 08, 2007
2003 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire VIN: 1GNFK16Z93
P0300: Multiple Cylinder Misfire Detected. car came in w/po300 miss fires ck plugs & replaced ck wires coils & injectors all good ran compression ck all at 145 to 160. tech then ck fuel pressure an found it below spec 40 psi replaced pump & filter still no fix ck back pressure on cat had .5...
August 08, 2007
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19R4W
P0300: Multiple Cylinder Misfire Detected. well I have another one here guys and gals. came into shop with trans. issues hi miles and tcc p1870 hard shifts. we did a pulse width modulation update and seemed to work good.Customer came back few days later felt like tcc shudder and then signal interrupted...
August 09, 2007
2000 GMC Sierra 1500 SL 4.8L Poor Idle Quality, Hesitation, Misfire VIN: IGTEK14V9Y
P0300: Multiple Cylinder Misfire Detected. hello there, thanks in advance for any responses. i have a gmc sierra, 4.8 v8, with missfires on warm up, at idle, have 56-57 lbs of fuel pressure, koeo, misfires are on cyl #2, and #7, only. intermittnely on #8, replaced the fuel pressure regulator, diaghram ...
August 09, 2007
1997 Chevrolet K1500 5.0L Misfire VIN: 1GCEK14M1V
P0300: Multiple Cylinder Misfire Detected. Truck came in running rough with CEL flashing. Missfire data indicated missfires on cylinder 7 only. Checked for vacuum leak with propane, none found. Checked resistance of plug wire on affected cylinder 1000 ohms. Swapped plugs on cylinders 5 and 7, miss stay...
August 10, 2007
1998 Volvo S70 GLT 2.4L MIL Lamp on VIN: YV1LS5671W
P0300: random misfire. The vehicle when driven less than 10 miles will have the misfire codes pending. On the next drive cycle, trouble codes will be present. WE have done a major tune up with Bosch parts, including plugs, wires, cap and rotor. Also the fuel injectors have been serv...
August 10, 2007
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13RXX
P0300: Multiple Cylinder Misfire Detected. I have a 99 Chev Tahoe that misses at idle.Cylinder 3,5,&6 show missfire with number 6 going to 189 count and resets and starts over , 3 goes to around 35 and 5 stays around 5 counts.I have checked for vauum leaks using smoke macine . no smoke anywhere. I ...
August 11, 2007
2003 Audi A4 1.8L MIL Lamp on VIN: WAUJC68E63
P0300: random misfire. This Audi came in with the above codes. Thought maybe the low voltage code may be a sign of what caused the misfire codes, so checked power at term#3 of control moduel, and grounds at Terms# 1$2. All check ok, grounds are clean and tight under the abs pump. Al...
August 13, 2007
1999 Chevrolet Tahoe LS 5.7L Misfire, Loss of power VIN: 1GNEK13RXX
P0300: Multiple Cylinder Misfire Detected. Hi folks, Tahoe came in with a loss of power and miss complaint. We performed a complete tune up and vehicle still displays same symptoms but is getting worse. When misfire data is checked , number 3 and number 4 cylinders always show misfire counts, several ...
August 13, 2007
2004 Dodge Ram 1500 Truck ST 5.7L Misfire, MIL Lamp on VIN: 1DHA16D34J
P0300: Multiple Misfire Detected. hi guys i have this truck last couple days ,after customer got arco gas car started misfire we remove gas tank and cleaned ,cleaned inj. and replaced spark plugs but still have same problem , couple people told me those engine has exhaust valve spring problem ...
August 13, 2007
1997 Chevrolet K1500 5.0L Misfire VIN: 1GCEK14M1V
P0300: Multiple Cylinder Misfire Detected. Truck came in running rough with CEL flashing. Missfire data indicated missfires on cylinder 7 only. Checked for vacuum leak with propane, none found. Checked resistance of plug wire on affected cylinder 1000 ohms. Swapped plugs on cylinders 5 and 7, miss stay...
August 14, 2007
2001 Dodge Stratus R/T 3.0L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 4B3AG52H81
P0300: Multiple Cylinder Misfire Detected. in the last 2 weeks vehicel has developed a rough idle, engine will random miss at idle and rpm will surge 200 -300 rpm and sometimes when idleing for 10 minutes engine will stall but restart ok. lt trim is 4 - 5 positive, oxygens sensors are switching, cranks...
August 15, 2007
2001 Dodge Stratus R/T 3.0L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 4B3AG52H81
P0300: Multiple Cylinder Misfire Detected. in the last 2 weeks vehicel has developed a rough idle, engine will random miss at idle and rpm will surge 200 -300 rpm and sometimes when idleing for 10 minutes engine will stall but restart ok. lt trim is 4 - 5 positive, oxygens sensors are switching, cranks...
August 16, 2007
2004 Ford Ranger Edge 3.0L Misfire, MIL Lamp on VIN: 1FTYR44U34
P0300: Random Cylinder Miss Fire. ... usually under heavy load. When this happens the engine light flashes and the truck wont get out of its own way. Misses very badly. If you let off of the throttle the miss clears up after about 15 seconds and the engine light will either stay lit or sometim...
August 16, 2007
1998 Mitsubishi Diamante LS 3.5L Misfire, MIL Lamp on, Lack of Power VIN: 6MMAP57P3W
P0300: Random Misfire Detected. Car came in with intermittent miss and lack of power. Scan tested and found code PO304. Replaced ign. wires and v/c gaskets. Small amount of oil in plug holes. Wires were original and KV tested high. Inspected plugs. Has Iridium NGk plugs and they are at .043 ...
August 16, 2007
2002 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GCEK14W82
P0300: Multiple Cylinder Misfire Detected. Vehicle came in no power & misfire found miss on 2,4,6 replaced plugs & wires. Still misfiring 2,4,6 also still no power fuel pressure good, cap & rotor good I need help
August 17, 2007
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDT13W6S
P0300: multiple misfires. ... running MIL light on spewing rich fumes, the wires shorting out and plugs looked to be original. The tune up did not solve all problems. I immediatly get the P0325 knock sensor code. I replaced the sensor and checked all connections. the engine is not knoc...
August 18, 2007
2004 Chevrolet Astro 4.3L Hesitation, Misfire VIN: 1GCDM19X64
P0300: Multiple Cylinder Misfire Detected. thanks in advance hope you all can help me with this one. Vehicle misses and hesitates cold, sometimes popping through intake, you can feel this thing miss after sitting for 1/2 hour also. problem only happens from idle to 1500 rpm. and lasts usually for 10 mi...
August 21, 2007
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Surge, Stall VIN: 3GNEK13T62
P0300: Multiple Cylinder Misfire Detected. Vehicle in for stalling, hard starting and surging/poor idle, backfiring. Codes present as I have listed. Smoked intake manifold and found no leaks other than a wisp from the throttle body. Tourque checked on intake bolts and was good at 10nm. Cant fault intak...
August 22, 2007
1996 Volvo 850 GLT 2.4L Poor Idle Quality, Misfire VIN: YV1LW5548T
P0300: random misfire. This vehicle is missing on 2 cylinders. The fuel pressure is 45 psi at idle, and when I disconnect the fuel pressure regulator there is no change in fuel pressure, the regulator is in between #1 & #2 cylinder (so have I answered my own question?). Compress...
August 22, 2007
1996 Volvo 850 GLT 2.4L Poor Idle Quality, Misfire VIN: YV1LW5548T
P0300: random misfire. This vehicle is missing on 2 cylinders. The fuel pressure is 45 psi at idle, and when I disconnect the fuel pressure regulator there is no change in fuel pressure, the regulator is in between #1 & #2 cylinder (so have I answered my own question?). Compress...
August 23, 2007
1997 Mercedes-Benz E420 4.2L Hesitation VIN: WDBJF72F7V
P0300: Misfiring Damages TWC. Engine shaking badly at idle. Tested and replaced #7 ignition coil and idled fine. Found that on accel from stop there was no power until rpm's came up and then came in. Cleared previous codes and drove a number of drive cycles. There are no codes now. Install...
August 24, 2007
1999 Dodge Avenger 2.5L Misfire VIN: 4B3AU42N7X
P0300: Multiple Cylinder Misfire Detected. this avenger has a missfire on cold start only. After you drive for 5 min misfire goes away. It is more prevelant at idle and slight throttle under full throttle it goes away.
August 25, 2007
1999 Dodge Avenger 2.5L Misfire VIN: 4B3AU42N7X
P0300: Multiple Cylinder Misfire Detected. this avenger has a missfire on cold start only. After you drive for 5 min misfire goes away. It is more prevelant at idle and slight throttle under full throttle it goes away.
August 27, 2007
1997 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X0V
P0300: Multiple Engine Misfire Detected. ... and took in for state emission test.failed with multiple codes. first thing we found was a check engine light bulb that looked like a flash cube - replaced bulb cleared codes and test drove.after 2nd test drive we tripped a code for multiple missfire - p03...
August 28, 2007
2004 Dodge Ram 2500 Truck ST 5.7L Misfire, MIL Lamp on VIN: 3D7KU28D14
P0300: Multiple Cylinder Misfire. this truck was tuned up about six months ago and came in last week with a very bad missfire only on cylinders 1,2,3,4. i have swapped coils no change.also moved wires from non missing clyinders to missing ones still no change.the miss is not always there it wi...
August 28, 2007
1999 Ford Explorer XL 4.0L Misfire, MIL Lamp on VIN: 1FMZV34X6X
P0300: cly 3 misfire. We need help on this...thanks in advance. This has been going on for about 2 years. The ck engine light keeps coming on, the codes keep coming up with missfires. At this time on cylinder #3 missfire (has been other cylinders), and the vehicle will intermittelt...
August 28, 2007
1996 GMC Sonoma SLE 2.2L Misfire VIN: 1GTCS194XT
P0300: Multiple Engine Misfire Detected. Vehicle has a misfire on #1 cylinder all the time. Checked spark, good, checked fuel pressure, good. Engine vacuum is low, 17.5"hg at idle, 19.5"hg at 2000 rpm. Swapped wires, coils & plugs, miss still on #1. Swapped fuel injector, miss still on ...
August 28, 2007
1997 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X0V
P0300: Multiple Engine Misfire Detected. ... and took in for state emission test.failed with multiple codes. first thing we found was a check engine light bulb that looked like a flash cube - replaced bulb cleared codes and test drove.after 2nd test drive we tripped a code for multiple missfire - p03...
August 29, 2007
2002 Toyota Sienna LE 3.0L Misfire, MIL Lamp on VIN: 4T3ZF13C9Z
P0300: Multiple Cylinder Misfire Detected. This one has me stumped. It is definitely misfiring and it shows on the Toyota scanner. The STFT on bank 2 is -20% at idle and -5% to -6% at 2500 rpm. Bank 1 trims are near 0. The plugs show signs of over fueling. The Bank 2 VVT never shows to activate like th...
August 29, 2007
1998 Honda Passport EX 3.2L Misfire VIN: 4S6CM58W8W
P0300: Random Misfire Detected. I have this 1998 honda passport in my shop,with this problem. bank 1 not working,its running on left bank only, cylinder # 1,3&5. no response. the coils are firing,injectors are firing, compression 150 psi. I even switched coils and injectors from left to ...
August 30, 2007
1999 Nissan Pathfinder SE 3.3L MIL Lamp on VIN: JN8AR0759X
P0300: Multiple Misfire Detected. this code will set on the dyno while looking at the emissions, and it is not misfiring. what suggestion does anybody have?
August 30, 2007
1999 Volkswagen Jetta GL 2.0L Poor Idle Quality, Misfire, MIL Lamp on, POOR OFF IDLE VIN: 3VWRC29M5X
P0300: random miss. Ok VW Techs I could really use your help on this one! It is really throwing me for a loop. After working on Audis the last 15 years i have been working on VWs the last 4 months. I am amazed how different they can be. Anyway, when you start the car it idles fin...
August 30, 2007
1998 Volvo S70 2.4L MIL Lamp on VIN: YV1LS576W1
P0300: random misfire. This car will set misfire codes intermittantly, no driveability concerns. Freeze frame showed STFT -7.8% LTFT 3.9%. Have performed smoke test for intake leaks, car has plenty of power and runs very smooth. Last time car was in for check engine light it had the...
August 30, 2007