scojack_2001
Livin' Like A Refugee
- Joined
- May 24, 2001
I've been chasing a rough idle/stumbling issue for the last week... Car runs 100% perfect until it gets good and warm. Then the gremlins come out. It's loading up on fuel, bucking, surging, the whole nine yards.
Here is what I know for fact.
It's not ignition, at least if it is I haven't found it yet. I swapped out the coilpack/module with a known good unit off a 11.0 car and no change. The coilpack has a extra ground to the intake manifold.
Swapped in a MAF from the same car and still no change. More on that later.
Changed the spark plugs to fresh R43TS's gapped at .032". Fresh MSD wires and a fresh Denso oxygen sensor. The old 02 was carboned up pretty good. As were plugs 1-4, numbers 5 & 6 were a little cleaner.
Cam sensor cap is in good shape and not cracked or damaged in any way. Screw is tight and very little play. Timing chain seems tight as well.
Fuel pressure is set at 42psi line off and the TT chip is on the base settings. All the MSD50's ohm out to 12.1 to 12.4 so I don't think that is a problem.
Coolant temperature stays at a constant 170° - 175°. Nothing crazy there. Stat fully opens around 185° and it comes right back down.
Grounds on the back of the head feel intact and the bolt is tight (not that I could see a damn thing back there anyway). Negative battery cable is good and tight.
Watched the MAF counts last night on the test drive and they were all over the place. Anywhere from 255 to 5. And this IS NOT beating on the car. It didn't see more than 3000rpms last night. Just steady cruising.
The MAF counts don't make any sense to me; because the other one didn't help at all. And if I unplug it, it just runs worse anyway...
I'm almost out of ideas here guys. I'll check the PowerLogger board to see if maybe it is coming loose, but I doubt it since something like that would be almost constant.
I'm gonna try and see if a original MAF helps, and if not I guess I gotta start going into the wiring....
Could really use some help here boys! I'd appreciate it.
Scott
Here is what I know for fact.
It's not ignition, at least if it is I haven't found it yet. I swapped out the coilpack/module with a known good unit off a 11.0 car and no change. The coilpack has a extra ground to the intake manifold.
Swapped in a MAF from the same car and still no change. More on that later.
Changed the spark plugs to fresh R43TS's gapped at .032". Fresh MSD wires and a fresh Denso oxygen sensor. The old 02 was carboned up pretty good. As were plugs 1-4, numbers 5 & 6 were a little cleaner.
Cam sensor cap is in good shape and not cracked or damaged in any way. Screw is tight and very little play. Timing chain seems tight as well.
Fuel pressure is set at 42psi line off and the TT chip is on the base settings. All the MSD50's ohm out to 12.1 to 12.4 so I don't think that is a problem.
Coolant temperature stays at a constant 170° - 175°. Nothing crazy there. Stat fully opens around 185° and it comes right back down.
Grounds on the back of the head feel intact and the bolt is tight (not that I could see a damn thing back there anyway). Negative battery cable is good and tight.
Watched the MAF counts last night on the test drive and they were all over the place. Anywhere from 255 to 5. And this IS NOT beating on the car. It didn't see more than 3000rpms last night. Just steady cruising.
The MAF counts don't make any sense to me; because the other one didn't help at all. And if I unplug it, it just runs worse anyway...
I'm almost out of ideas here guys. I'll check the PowerLogger board to see if maybe it is coming loose, but I doubt it since something like that would be almost constant.
I'm gonna try and see if a original MAF helps, and if not I guess I gotta start going into the wiring....
Could really use some help here boys! I'd appreciate it.
Scott