pappyl
06-28-2012, 11:36 PM
I figured I'd post this in case anyone searches for the same problem...
Driving along about 90km/hr and check engine light goes on, engine revs jump up, then bogs, lose speed - run for a mile or so at 3000 rpm, then everything goes back to normal.
Use my scanner on it - got a cylinder missfire code (sorry forget the number). So first thing, pull the plugs. They look a little sour, little old, so I replace them. Car seems to be running fine for a few weeks after that.
BUT, it seems, every once in awhile, to "miss/hesitate/lose power" when going down the highway - very subtle though.
Next thing - I get a bad catalytic code p0421 - I scan and sure enough the rear o2 is jumping up and down in synch with the front (almost). Cat's shot. So I replace the cat $300.
Couple days later the missfire comes back (when I'm in town), car hesitates, then almost dies, no power, then surges and runs normal then dies again. I nurse it to the local garage because I live a ways away and wont make it back (time to cough up the $).
Well I had (2) ideas
1) Ignition control module
2) Coil
Mechanic hooks up his super scanner and sees 2 & 3 are misfiring, 1&4 are OK. Problem only comes up after revving it to 3000rpm up and down for 5 min as it runs normal when they pull it in the garage.
New coil pack was in stock, luckily. Note - on this one you needed to swap the little connector piece along with the black housing cover.
Running find now....
mechanic told me a missfire code can be caused by coil or the fuel injectors. This was definitely electrical given the way it was coming and going though.
Just in case anyone else has this same problem.
Driving along about 90km/hr and check engine light goes on, engine revs jump up, then bogs, lose speed - run for a mile or so at 3000 rpm, then everything goes back to normal.
Use my scanner on it - got a cylinder missfire code (sorry forget the number). So first thing, pull the plugs. They look a little sour, little old, so I replace them. Car seems to be running fine for a few weeks after that.
BUT, it seems, every once in awhile, to "miss/hesitate/lose power" when going down the highway - very subtle though.
Next thing - I get a bad catalytic code p0421 - I scan and sure enough the rear o2 is jumping up and down in synch with the front (almost). Cat's shot. So I replace the cat $300.
Couple days later the missfire comes back (when I'm in town), car hesitates, then almost dies, no power, then surges and runs normal then dies again. I nurse it to the local garage because I live a ways away and wont make it back (time to cough up the $).
Well I had (2) ideas
1) Ignition control module
2) Coil
Mechanic hooks up his super scanner and sees 2 & 3 are misfiring, 1&4 are OK. Problem only comes up after revving it to 3000rpm up and down for 5 min as it runs normal when they pull it in the garage.
New coil pack was in stock, luckily. Note - on this one you needed to swap the little connector piece along with the black housing cover.
Running find now....
mechanic told me a missfire code can be caused by coil or the fuel injectors. This was definitely electrical given the way it was coming and going though.
Just in case anyone else has this same problem.