The problem came back after I just got back the exhaust shop. I have an old opti that I had from before I rebuilt the engine. It was working fine before so I'm going to see if my ebay opti is the problem. This is driving me nuts.
just pulled the opti out in an hour and 1:15 minutes. It really is a f'd design to have thewater pumpover the distributor. The plug wires are tough to pull off causeof the slime thecoolantleaves behind.
I drove the car over and over to kind of get a better feel for the problem. I noticed the old opti smoothed out the motor, I kind of feels like the motor lost compression. The new opti gave me a feeling that I could feel every combustion in every cylinder. Anyways, I was reading about vacuum leaks and I think I have conducted my test incorrectly. From what I hear, fuel injected engines need to be tested with the IAC disconnected. Makes sense so i going to retest for vacuum leaks.
I put the new AC delcom O2 in and it did not help.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
I put the new AC delcom O2 in and it did not help.
I changed the Opti harness and no helpy neither.
I'm not concerned about compression. The motor is rebuilt and runs strong while the RPMs are up. I'm datalogging today and noticed the car runs stumblesand evetually dies once it goes into closed loop. The INT go down to the 70's on both sides right before the car dies. I can smell the raw gas fumes. I'm wondering why it would run rich in closed loop.
Like I said earlier I am leaning to a problem in the tune. I have seen alot of mail order tunes that run decent on the throttle but idle like absolute garbage. If you are cammed you are idleing in a different region of the VE table and the BLM's are going to respond differently to the vacuum change. You could also be in some type of engine protection/cat overtemp mode which will default to 11.7 AFR. I'd call your tuner back.
__________________ 95 LTx Z28 Quasar Blue
BMR Suspension, Strange Dana 60 w/ 4.56's, AI TFS 215cc CNC Heads, AI SR Cam, QA1 Coil Overs, 385c.i. Callies Magnum, Oliver Billets, SRP Pro Series 13.9:1, Ported Intake, Pro Built Auto's 4l60e MVB Pro Street Trans 4000 Vigilante, Self Tuned FAST XFI #3515---10.70 @128.4 Spinning 1.56 60'
06 GTO M6
CAI, Stainless Works Headers, Self Tuned w/EFI Live, B&M Shifter, BMR DB's, Bassani CB 13.13@109.3 on 235/40ZR18 Bridgestones 2.20 60'
I just emailed my tuner and attached the data log. I refered him to the records that show exactly what happens and when it happens. I'm going to anohter tuner on Thursday.
I dropped the car off at NextGen Auto Sports in Hayward CA. They are going to Dyno diagnose the car. The bummer is that they can't touch it for a week or 2 because they are swamped with work. I'll get back to the forum as soon as I have some more info.
