I have replaced all sparkplugs and ignition coils, but within 2 weeks, continue to have misfire problems, and end up replacing another ignition coil. When hooked up to a computer, it only says misfire and which cylinder. I can't figure out why it keeps blowing coils and causing misfires. Can you help?
Coils burn from over voltage
could be a problem ECM
Have the electronics professionally checked
SOURCE: Random Cylinder Misfire
Im having the same problem with a 96 buick century. I wondering if its the coil packs. The plugs and wires have 8000miles of use. So i think it shouldnt be them. But same symptoms, engine code P0300.
SOURCE: Random Cylinder Misfire
Get a Haynes manual for your vehicle and use the troubleshooting guide there. about $20 from amazon, auto parts store or haynes.com. This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.
David, 99 Saturn, Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync). Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect. The belt could also be old/dryrot and have lost a tooth or two causing it to jump. If any of these are the case, or if the timing belt interval is near, replace timing belt, tensioner, idler roller if present and water pump. FYI, quality OEM ignition wires shold last at least 10 years. If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby. We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old.
good luck.
SOURCE: Cylinder #1 misfire on a Ford Taurus SHO
do a compression check. if you have a low compreeion reading below 80psi you need to do a head job. question is the iol milky on the dip stick?
SOURCE: 98 vw beetle misfiring after rain. New plugs, coil cas cracks????
Hi, Yes it certainly could be especially if water gets in. You should also check the distributor cap. The misfire sounds like an arcing problem so it would have to be one of those two things since you changed the rest. Good Luck!
SOURCE: 99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..
Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...
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