Impala - Chevrolet :: 2000 3.8L V6 - Code P0300 Multiple Random Misfire
I have a 2000 Impala with a 3800 V6 series 2 with 165,000 miles. The only code I had was a P0300 Multiple random misfire that occured off and on at first, Worse in the city Better on Highway. It would start running on half the cylinders and bogged down, with the check engine light flashing, after getting onto the highway it would straighten itself out at first. I thought i had water in the gas so i ran some heat through it. straightened out for a day then happened again so I thought maybe a should run some premium gas in it, The car ran like total crap until the premium was gone, so i thought maybe it's running too rich, I put 87octane in it and it ran great for a day or two, then it gradually got worse to where it would not straighten up on the highway, tried to die at stoplights and i had to drive it with 2 feet to get it home and park it. I've replaced the battery, spark plugs, wires, ICM checked good, coil packs are good, replaced fuel Pressure regulator, looked for arcing on the spark plug heat shields and it will not start. It turns over but doesn't try to ignite and when I get the slightest rumble of ignition, it backfires up through the manifold and I see a puff of gas or light smoke by the exhaust manifold.
The car had a vacuum leak around the intake manifold cover gasket and a leak on the fuel rail. I pulled the fuel rail off my impala, snugged up the rest of the intake bolts then disassembled the fuel rail, flushed it out and cleaned the injectors the best i could, then reassembled it. before i re-installed the fuel rail I hooked it up to the fuel lines outside of the engine and tried to start the vehicle. all injectors had a nice spray pattern. So i installed the rail and it still didn't start but it had more combustion than before although it's still backfiring like before. Checked the fuel pressure by turning the key on and the fuel pressure went to zero very fast. I blew the rail out with air so to make sure i didn't damage the regulator I replaced it with the old one, ran the test again with same results, so i reinstalled the new regulator. I performed the fuel pressure test a few more times while moving the fuel hoses and when i moved the back supply line the vacuum loss stopped then dropped to zero when i let off of it. So I replaced the fuel line connector and O-rings on the injectors. It no longer has a vacuum leak.
I cleaned the EGR Valve out and had no luck there, then I removed the Idle Air Control Valve-pushed the pintle in, re-ionstalled it and WooHoo! it started! Although it still ran like crap with the same random misfire I was still happy to hear it start.I pulled the plugs on it to do a compression test and all 6 cylinders have between 180-190psi so the engine is in good condition mechanically. I installed new plugs before getting the car restarted and when i removed them for the test they were covered in thick black soot after running for roughly 15 minutes max.
I have (2) 2000 Chevy Impala's so I've swapped sensors from my wifes car to see if it would fix it. I've tested the following MAP, MAF, IAC, coil packs and ECM. None of these made the car change. I believe it is a timing chain because the car has never had a new timing chain and is way overdue, but I haven't had a code for a crankshaft position sensor. Can the timing chain be bad without throwing a code? It's not out of time enough to change the valve timing because I had a good compression test but its not firing right and still has the multiple random misfire. I have not checked or received a trouble code for o2 sensors, crankshaft position sensor or cam sensor. Something has the timing retarded and is dumping extra fuel into the engine because my new plugs looked like they were in the engine for a year.
Ford Aerostar :: Bad Shudder At About 30 To 50 Mph / CEL Comes On And Number 6 Misfire
I've been working on a 1996 aerostar van with a 4.0 for about a week now. Has a bad shudder at about 30 to 50 mph, check engine lite comes on and say number 6 misfire, when I first started working on the van it had cyl 1, 3 and 6 misfire put new plugs and wires on and it kept showing a number 6 misfire changed coil. Seem to work somehow, but they took it on a 260 mile round trip and used 34 gals of gas.
View 8 RepliesDodge - Neon :: 1997 - Misfire In The Number 4 Cylinder?
My dad's 97 dodge neon is showing a misfire in the number 4 cylinder. He replaced the spark plug but still getting that code and engine not running smooth. What other things could cause this? Engine has about 130,000 miles on it, had been running fine.
View 9 RepliesPrius (2004-09) :: Number 1 Cylinder Misfire - Error Code P0301
So I dropped my prius off to get looked at for error code p0301 number 1 cylinder missfire. They ruled out Spark plugs, coils and fuel injector. What else is ther? Also could it be the battery or even gas?
View 12 RepliesChrysler - Ptcruiser :: P0304 Error Code - Cylinder Number Four Misfire
2006 PT Cruiser Touring Ed. The engine light came on 2 days ago, had it looked at today and the error code p0304 "cylinder number four misfire" was diagnosed. What causes that and what would need to be done to fix that problem?
View 9 RepliesSanta FE SM (2001-06) :: Burned Out Plug Wire - Number 4 Cylinder Misfire
I've had the plug wire for my #4 cylinder burn out twice in the last 6 months. The car started running like crap and threw a CEL, the code was for a number #4 cylinder misfire. When I pulled the wire it has obvious signs of being burned out, like white powder and burn spots near the base of the wire where it goes over the plug. The plug and coil both look normal. No issues with the other cylinders. What could cause it?
This is on my '05 Santa Fe, 2.7l, FWD auto, with 180k miles
Ford Ranger / B-Series :: 1999 - 304 Code / Misfire In Cylinder Number 4
1999 ranger 155k 3.0 flex fuel. 304 is misfire in cyl number 4... I replaced the plugs and wires and checked the coil. the compression in cyl 2, 4, 5, 6 and got 80-90 psi so they are consistent but consistently bad right, it may be my compression tester.
The #4 plug was spotless after running 5 min, the #5 plug had some black on it already. Its hard to tell but it seems I had fuel residue on the plugs on cyl 5 and 6 but none on 4? Whats next pulling the intake to get to the injector?
Cavalier - Chevrolet :: 1998 - Number 3 Spark Plug Blow Out
My girlfriend has a 1998 Cheve Cavalier that recently on the way to work completly blow out the number 3 spark plug. It was completly gone and poofs of air now come out of it's place?
View 1 RepliesPassat (B5) :: 2000 - Torque Converter Part Number?
My torque converter is on the way out so I need to look for a new one. I'm pretty new at the transmission thing but I was told by my indy that my torque converter is on the way out. My problem is that I can't find the part number for my torque converter. I have a 2000 1.8t tip ATW.
View 3 RepliesFord - Explorer :: 2000 - Number 1 Spark Plug Not Firing
Ford Explorer Sport 2000, Number 1 spark plug has miss firing already replaced spark plugs wires and coil pack what more can i do to get spark from number 1 to spark and took garden hose to listen to injectors clicking when running. any other part for spark.
View 1 RepliesOldsmobile - Starting - Intrigue - Rough :: 2000 - Idles At Non Regular Number?
I don't know what is wrong with this car, I have put in new titanium plugs, new plug wires, new fuel filter, new air filter, changed the oil, I burn mid-grade gas. The car starts right up when cold, however once it warms up it idles on a non regular number, dies when driving and is very hard to start. I get lousy mileage and it smells like it is either not getting enough gas or not getting enough air. I don't know what else to do. I had it analyzed with an electric analyzer, no codes were found. When the plugs were put in the air flow sensor had either gas or oil on it. It does not use any oil.
View 1 RepliesChevrolet :: Engine Misfire / Exhaust Leak
What seemed to be and exhaust leak and wasn't so we decided that we should change the distributor cap and spark plugs and wires and now the engine is misfiring. We did everything correctly but don't know the reason for the engine misfiring and don't know why the car had symptoms of a exhaust leak and when taken to exhaust specialists they say there was no leak.
View 13 RepliesChevrolet - Venture :: 2003 - Misfire On Cylinder 5?
I have a misfire on cylinder #5 on my 03 Chevy Venture with a 3.4L, I changed the #5 Injector because the shop I took it to said that's what it was. But the same code came back for misfire cylinder #5, would a bad plug or wire cause the same code to come up.
View 6 RepliesChevrolet - Aveo :: Intermittent Misfire At Idle And Between 50 And 55 Mph When Going Up Incline
My 2004 Chev Aveo has recently developed a strange misfire pattern. I am hoping to get some clues before I take it to a mechanic. It only misfires when at an idle and then again between 50 and 55 mph going up an incline. Above 55, it runs fine. Between 5 and 50, it runs fine. It has 109,000 miles and had the timing belt changed at 90,000. What would be causing this?
View 4 RepliesChevrolet - S-10 :: Check Engine Light Come On / 4th Cylinder Misfire
2000 Chevy S10 pickup
Had the check engine light come on, and when I checked on the code it gave a 4th cylinder misfire. Autozone instructed me to simply replace my spark plug with a new oem plug.
I replaced the spark plug as instructed. After about an hour of driving, the check engine light goes off and I think, great! Problem solved. However, another hour of driving and the check engine light is back on again, without going away.
I headed back to autozone to get a readout, just to find that it's the same code. So I put another spark plug in. Same result - check engine light goes off after an hour, only to come back on again permanently after another hour.
Now, normally I would think, this must be the spark plug line that needs replacement,however I am sure there must be some clue in the fact that the check engine light turned off for an hour.
By the way, not sure if relevant, but I also found a lot of build up around the spark plug before I initially changed it.In fact, there was so much that I had to scrape around the plug with an awl, and blow out the crud with a compressor,just to get my socket into place without there being crud in the way.
Any clue what that check engine off/on clue might be?
Chevrolet - Montecarlo :: 2003 - High RPM Random Misfire
Here's the deal with this car i just did head gasket, valve job, all new intake gaskets and spark plugs. Car idles fine and mid throttles fine but with high throttle it wont shift and flashes the random misfire light p0300 it seems to run out of power. I've heard everything from maf sensors to ignition coils and wires. i was just wonder a good place to start and good test to do. I have most testing equipment including scan tool so i can ride with it. o and all cylinders compression tested above 150.....
View 13 RepliesChevrolet - Express :: 1996 - Code P0305 - Misfire In 5?
96 Chevy express 1500 V8-305. Have a P0305 code...Misfire on 5. Let me tell you everything I have done so nobody wastes their time.
I have, replaced the entire ignition system, "EVERYTHING" including a new distributor...Not the problem... I did a compression test...Not the problem...injector cleaning...not the problem.
When I moved the wire harness that goes into the "spyder" fuel injector system the engine smoothed out. I untaped the harness from around the plug and applied pressure to each wire the engine smoothed out. The back row 2nd pink wire seems to cause the most reaction.
My question is...Is it the wire harness or is it the injector system not reading plug? or could it be a combination of the 2? If I replace the wire harness might I still have to replace the injector system?
Chevrolet - 1500 :: 1997 - Code P0303 / Misfire On Cylinder 3
1997 chevy k1500 ... I have a misfire on cylinder 3 that i cannot figure out the cause. The idle is rough, backing out after starting is very rough, it seems to pick up at higher rpms but once the truck upshifrts to the next gear it shakes like a leaf in fall. within the past year the engine was rebuilt all new seals a new fuel pump, new injectors, new everything practically. so far i have done the following:
compression test results:125-130psi
fuel pressure test results: 50psi once primed, 50psi with engine running, no immediate pressure loss after engine is shut off
new spark plug wires
new spark plugs
replaced all four o2 sensors
Chevrolet - Avalanche :: 2003 - P0300 Code / Multiple Or Random Misfire?
My 03 Chev Avalanche is giving me a P0300 code (multiple or random misfire). With no distributor or individual coil is this something I can fix myself or is it shop time?
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