Mild combination - 1998 firebird, 241 stock unported heads, fast 92mm intake and NW 92mm tbody, cam (.588/.595, 228/232, 114 LSA), 1 7/8 headers, alum flywheel.
So first tuner had car running like crap for anything but WOT. It would always go to PE table and cruising around 10:1. Gave him 2 chances to correct it but he didn?t give a crap.
Second tuner (after weeks with the car) said he had car running great. But on the next night says he says its getting 4 degrees KR and found knock sensor error code and figured he changed the knock sensors. While doing that, he saw the knock sensor wiring harness crimped in between the transmission and the engine and said that was causing a short and triggered the error code. So he put in new harness and continued tuning. Said he said that now it?s running great again and come pick it up. I come after work the next day and his O2 wideband is still attached to my car ? I asked ?whats up because I thought it was done?? He said he wants to finalize the tune with me in the car. OK whatever? We go for a cruise on highway and now he is seeing KR at WOT. After an hour driving around and him lowering timing and adjust MAF table, he can?t get rid of it and tells me to :
-take it home and
-swap out the plugs because maybe running on the old tune for so long fouled them
-maybe the pinched knock sensors wiring harness broke the PCM
-log more files at home
So yesterday I log more files and get KR anytime I got WOT. Logs attached. Note: The a/f in the logs in skewed because I think I didn?t set it up right in HP Tuners but my in car wideband shows pretty solid 12.5 at WOT. The logs show about 13.4 at WOT but I?m pretty sure the logs are off and my wideband is right on.
I will swap plugs soon and re-log but I think new plugs will only make it burn better and leaner which could exasperate the issue if its caused by leanness (which I don?t think it is).
I have a call in to tuner today and I know he?s gonna push replacing the PCM but I think that is bogus. Car runs great around town, very close to 14.7 while cruising.
My thoughts:
I?m fairly certain he started my tune with a base 98 calibration and tweaked it from there..
-My car has 5 wire 85mm c5 z06 MAF and his MAF table looks very close to stock 98 table where as for reference, my old c5 cars had lower numbers in that table. Should the 85mm c5 maf require lower numbers in the MAF table (I think 98 fbody and mine are about 36 to 38 but the c5?s I?ve seen are more like 32).
-I don?t think PCM is damaged at all. No codes and no drivability issues. Only issue is KR at WOT. Can pinched knock sensor harness fry a portion of the PCM?
This is really frustrating. Thanks for any suggestions?
Rob Config.cfg
Scott wot pull 1.hpl
Scott wot pull 2.hpl
ws6 final.hpt