DROPthatCLUTCH
10+ Year Contributor
- 483
- 2
- Feb 21, 2011
-
Calgary,
AB_Canada
Weirdest thing happened the other week.. Car has been running great all year until I replaced the CAS o-ring. Yes I set base timing back to 5* BTDC with a timing light. Yes the notch inbetween 10BTDC and T. Yes I grounded the timing connector via ecmlink. Yes I installed the CAS with the notches lined up while cylinder 1 was at TDC on compression stroke.
Got crazy idle surge after I replaced that o-ring so I did Terry's idle surge trouble shooting and found my ISC to be bad after a quick continuity test across 1-2, 2-3, 4-5, 5-6. So I priced out a new revised ISC and decided I'd block it off instead.
After the install of the block off plate it still boosts strong and while I'm actually moving in the car it feels just as it did before, but when I come to an idle it surges 1500-2000 and it's running lean at idle now too after the block and it wasn't before. 18:1 and higher as the idle speeds up, then it cuts fuel, pegs the WB the idle drops and then AFR drops to about 18:1 again. Cruising and WOT AFRs are unchanged from before.
It only starts surging once its in closed loop BTW. Warms up steady around 1500rpm.
Boost leak tested and she's tight no leaks, which I already new. So I grounded the timing pin again in ecmlink and started messing with the BISS now that it seems this is my only way of controlling idle mechanically. I have it bottomed out and the surges become less violent and slower but the problem persists.
What are you guys adjusting on link to steady this out at idle.
Got crazy idle surge after I replaced that o-ring so I did Terry's idle surge trouble shooting and found my ISC to be bad after a quick continuity test across 1-2, 2-3, 4-5, 5-6. So I priced out a new revised ISC and decided I'd block it off instead.
After the install of the block off plate it still boosts strong and while I'm actually moving in the car it feels just as it did before, but when I come to an idle it surges 1500-2000 and it's running lean at idle now too after the block and it wasn't before. 18:1 and higher as the idle speeds up, then it cuts fuel, pegs the WB the idle drops and then AFR drops to about 18:1 again. Cruising and WOT AFRs are unchanged from before.
It only starts surging once its in closed loop BTW. Warms up steady around 1500rpm.
Boost leak tested and she's tight no leaks, which I already new. So I grounded the timing pin again in ecmlink and started messing with the BISS now that it seems this is my only way of controlling idle mechanically. I have it bottomed out and the surges become less violent and slower but the problem persists.
What are you guys adjusting on link to steady this out at idle.