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P0304 Diagnostic Trouble Code Discussion for December 2009

Cylinder 4 Misfire Detected *

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Trouble Ticket Help Requests for DTC P0304

	Help Request	Posted
	1999 Mercedes-Benz C43 AMG 4.3L Hesitation, Misfire VIN: WDBHA33GXF P0304: Cyl 4 Misfire. This one is giving us a headache. This vehicle when cold, will fall on its face under medium to wide open throttle and will not rev up. It will start missing when it is hesitating and turn on the check engine light showing misfires on the right bank. Once the ...	December 01, 2009
	1999 Chevrolet Astro 4.3L Poor Idle Quality, Misfire VIN: 1GCDM19W4X P0304: cyl 4 miss fire. ... aux and dlc ) replaced fuse and checked for codes none found (i did not road test this van) came back with code p0300 and p0304 opend eng comp and found that the dist cap rotor wires and plugs where oem dist cap still had ...	December 03, 2009
	1997 Oldsmobile Silhouette 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GHPU06EV5 P0304: cylinder 4 misfire. car came in for rough running all speeds. engine will run for 2 seconds smooth when first started & then misfire. cleaned injectors with gm injector cleaner, vacuum readings normal. spark plugs are correct, firing order is correct checked coils for arcing ...	December 07, 2009
	2003 Cadillac Escalade 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GYEK63N43 P0304: Misfire Cyl. 4. I have this 03 Escalade, one of our recon vehicles, with misfires at idle. There are no misfires until the idle drops to 575-625 hot idle, park or in gear, then #5 misfire counter runs up steadily followed by #4 at a slower misfire rate. Any slight raise in rp...	December 08, 2009
	2003 Honda Pilot EX 3.5L Misfire VIN: 2HKYF18453 P0304: Cylinder 4 Misfire Detected. This vehicle has a slight miss at idle only. Has had previous work done at another repair facility to cure this problem. Now it is at our shop and was wondering what direction I should start with to fix this problem. I know these carlines have problems with eg...	December 08, 2009
	1997 Oldsmobile Silhouette 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GHPU06EV5 P0304: cylinder 4 misfire. car came in for rough running all speeds. engine will run for 2 seconds smooth when first started & then misfire. cleaned injectors with gm injector cleaner, vacuum readings normal. spark plugs are correct, firing order is correct checked coils for arcing ...	December 08, 2009
	2003 Cadillac Escalade 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GYEK63N43 P0304: Misfire Cyl. 4. I have this 03 Escalade, one of our recon vehicles, with misfires at idle. There are no misfires until the idle drops to 575-625 hot idle, park or in gear, then #5 misfire counter runs up steadily followed by #4 at a slower misfire rate. Any slight raise in rp...	December 09, 2009
	2001 Lexus IS300 3.0L Misfire VIN: JTHBD18211 P0304: Cylinder 4 Misfire Detected. Hello technicians, I had a customer bring a car to me for a smog check. After the smog check, the engine light failed, but the emission passed. In test 15 mph, the HC MEAS was 0. CO % MEAS was O.00. NO MEAS was 56ppm. In test 25 mph, HC MEAS was 0. CO was 0.00...	December 10, 2009
	1997 GMC Jimmy SLT 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKDT13W1V P0304: Cylinder 4 Misfire Detected. thanks in advance for any and all help. I have a 4.3 in here giving me fits. It has a miss on cylinder 4 at idle that goes away above 1500 rpm. On a cold start it will run fine for the first 2-3 minutes then starts missing on #4. I have checked spark which is ...	December 11, 2009
	2001 Mazda Tribute ES 3.0L High backpressure VIN: 4F2YU09111 P0304: Cylinder 4 Misfire Detected. I'm hoping someone has run into this before and can shed some light on a difficult problem. When the vehicle originally came in, the egr valve had a hole in the side of it. We found that this was due to excessive backpressure. The convertor on bank 1 had come ...	December 11, 2009
	1999 Mercedes-Benz C280 2.8L Misfire VIN: WDBHA29G4X Been a Member since 1994.Rarely ask for Help. This is a hair Puller! Compression,Fuel Pressure, Engine in good Shape Car runs on 6 Cylinders, It will then start to miss fire on cylinders 4 5 & 6.Will Sit and Idle all day only happens under a load. The comp...	December 11, 2009
	2002 Subaru Forester 2.5L Misfire VIN: JF1SF63512 P0304: Cylinder 4 Misfire Detected. This one mifires randomly on every cylinder only at idle, just off idle it goes away. Replaced spark plugs and wires-no change. LT fuel trim is at -24 and upstream O2 stays at 1.5V. Replaced oxygen sensor-no change. Checked for vacuum leaks and found none.	December 14, 2009
	2000 Toyota Celica GT 1.8L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: JTDDR32T5Y P0304: Cylinder 4 Misfire Detected. Vehicle came in running rough with lack of power. Cleaned MAF sensor and got a little better. Removed battery cables to clean posts and after restarting motor ran terrible. Now has extreme lack of power, feels like retarded timing but timing is at 16 degrees a...	December 14, 2009
	2001 Mazda Tribute ES 3.0L High backpressure VIN: 4F2YU09111 P0304: Cylinder 4 Misfire Detected. I'm hoping someone has run into this before and can shed some light on a difficult problem. When the vehicle originally came in, the egr valve had a hole in the side of it. We found that this was due to excessive backpressure. The convertor on bank 1 had come ...	December 15, 2009
	2002 Honda CR-V LX 2.4L No Start, Misfire, Poor Fuel Economy, MIL Lamp on, Rich VIN: SHSRD68422 P0304: Cylinder 4 Misfire Detected. Hello everyone. The main problem with this vehicle is it runs very rich. So much so that when cold it will soak the spark plugs and not start. I pulled the plugs and let it sit overnight. I did the compression check and re-installed the plugs. It starts and ru...	December 22, 2009
	1998 Chrysler Sebring JXi 2.5L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 3C3EL55H3W P0304: Cylinder 4 Misfire Detected. I was given car after Apprentice Tech did a Tuneup ( plugs and wires) to fix a misfire. Car has been here two weeks. I initially checked fuel pressure and found no problem it was when I tested and founf that the coil could not produce enough spark to jump a HE...	December 28, 2009
	2005 Cadillac CTS 3.6L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6DP56765 P0304: Cylinder 4 Misfire Detected. No experience on this engine.Car was towed in 2 weeks ago and would not start, found almost no oil in engine, changed oil and vehicle started and has been running fine since. Now we have a rough idle, with misfire codes on bank 2 and intake correlation code P0...	December 29, 2009
	2002 Saturn Vue 3.0L Misfire, MIL Lamp on VIN: 5GZCZ63B42 P0304: Cylinder 4 Misfire Detected. Found timing belt one tooth off on bk 1 and wrong spark plugs installed. Reset timing belt and installed correct sp plugs misfire still present under load cyl #2-4-6. Ive checked for vacum leaks w/smoke machine and fuel. Ran compresion ckecks cold and hot chec...	December 29, 2009
	1998 Toyota T100 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JT4TN14D4W P0304: Cylinder 4 Misfire Detected. Have this truck here for the first time. It looks like someone has put on two new oxygen sensors. It runs smooth for about 5 seconds after you start it. It immediately starts to stumble very badly and then dies. I thought maybe the cat was plugged. I put a pre...	December 29, 2009