Posted: Mon Mar 05, 2012 12:58 am Post subject: gen v problems
Ive been posting on grandprixforums and no one can really think of anything else to do so I figured id get a second opinion here.
So I finished my gen v swap last Tuesday and car ran fine until I tried going WOT. The car would sputter and my aeroforce would say there was 4-6 misfires, seemed like a lot more than just 4-6 to me. Anyway the car ran perfectly just cruising around as long as I didnt get on it so I drove it home and waited til morning to figure it out. I checked out my plugs (just installed new autolite 104's) I gapped them to .050" when I first installed them. Buddy of mine told me to gap them to .055" so I did and nothing changed. Checked the northstar connections and everything was fine. All wires were on the plugs and coil pack. While driving around after checking the wires and plugs I got a check engine light. Aeroforce gauge gave me 4 codes. They are: P0101, P0102, P0113, and P0172. All MAF sensor codes since the IAT sensor is in the LQ4 maf sensor. Last one is bank one rich code. LTFT bank 1 was -22.6. I cleaned the MAF and still ran the same. I swapped the MAF with the one out of my grandpas truck with the LQ4 motor. Still ran the same. I called Intense where I got my PCM tuned for the LQ4 and he said it showed on his computer than it should have been tuned for it but there is no way to know for sure unless he had the PCM in front of him. We also made sure the pigtail for the lq4 sensor was wired up correctly which it was. He told me he was going to call around and see if anyone has had this problem before and let me know friday but I never heard from him. Will be calling tomorrow. He suggested just unplugging the connection for the maf sensor until we figure it out. I did and the car runs perfectly except for the 5.5-6* of knock I get if I get on it but no misfires and am still getting the P0102. So does anyone else have any idea what it could be?
Something is wrong with your tune, MAF, or wiring for the MAF.
First things first, DO NOT go anywhere near boost without your MAF sensor plugged in...better yet dont drive the car until you figure this out.
The code is there because your MAF is unplugged. Im suspecting something is wrong with your MAF wiring. The KR is present because the PCM has no idea how much airflow there is, its using your VE tables to determine fueling and without extensive car specific tuning that is a VERY bad situation.
If you know someone with a tuner have them pull your .bin off the pcm and ill verify that its tuned for the lq4.
I realize that code shows up because its unplugged. I was just giving out all the info I could about the situation. I talked to john from intense who did the tuning and we went over the pigtail for the maf since he had one and mine was wired up the same as his so I doubt its the wiring. I swapped maf sensors with a known good one and both vehicles ran the same with opposite maf sensors so it can't be that. Which leaves the tune. He is almost 100% sure it got downloaded to my pcm but there's no way to know for sure I thought it was the tune but I don't want to start pointing fingers until I know for sure.
*Edit* Just talked to john from intense and he said he talked to some others and the general consensus was that the wiring pigtail that makes the maf sensor and iat sensor into one for the lq4 could be bad and i shoud try to get a new one from zzp. Anyone else have or heard of a problem from a lq4 kit?
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