harrybeachdog

I've always had a rich/lumpy warmup, but it just dawned on me that my map was reading really high. Like, 75-90kpa on cold start. That part of the fuel map had a lot more fuel being added, so it explains the rich/lumpy part. Now why? As the car warms up MAP goes down to a normal figure, and idle smooths out. Boost/Vac gauge sourced from a different line on the IM agrees.

Internally stock fm2 vvt engine in a 96 using a 9697 MSPNP I changed over to have a ms2 daughtercard. VVTuner is wired in parallel for the sensors and is using the basemap from DIY.

harrybeachdog

Here's a set of logs on a new set of plugs(Bosch FR6DCX gapped down to .024) and a brand new lsu4.2 sensor properly calibrated to my MTX-L. On Saturday I realized partway through warmup that one reason it was so absurdly rich is how high the MAP was reading on cold start. Almost atmo, so I pulled some fuel out of the high map - low rpm range while it was warming up and it helped lean it out a lot. But it's still idling really lumpy, like a a ported out rotary, shaking the whole car. Still, not sure why it's doing that. I'll upload a log in a few minutes of a cold start today, while no changes are being made.

Cold start Saturday while making changes - https://drive.google.com/file/d/0B2m...ew?usp=sharing

Bit of a drive after, in case that helps anything - https://drive.google.com/file/d/0B2m...ew?usp=sharing

harrybeachdog

Sunday Cold Start file - https://drive.google.com/file/d/0B2m...ew?usp=sharing

Sunday Drive file - https://drive.google.com/file/d/0B2m...ew?usp=sharing

LOT smoother, still can't figure why map is so high on coldstart, but completely fine when warm.

harrybeachdog

Bumpity Bump

Jiggerachi

Did you ever figure this out? I'm getting to the bottom of a similar issue, except on warm starts. Symptoms are exactly the same, high MAP, lumpy idle around 500rpm and ridiculously rich. Cold starts are fine.