:driving: Turbo Boost Gauge readings

NoDOHC · 09-23-2009, 11:31 PM

If the idle is above 750 and the engine is warm, the BAC should be shut. If you unplugged it and the pulsation didn't go away, I doubt that it is the issue. The stock ECU has a 'hole' in the timing map to make the engine idle down while getting excessive air and fuel (5 degrees ATDC). If I program a similar hole into my Haltech, it will do the same oscillations if I set the idle too high. Seriously, try adjusting the idle down to 750 with the check jumper connected and then see what it idles like.

This still doesn't explain why the engine is running at such low vacuum. You said that it revs very quickly from idle if you floor it?

Are you sure that the timing is correct?

By press the TPS in all the way, you mean floor the gas, right? Pressing in the TPS without moving the pedal shouldn't make the engine rev to the redline.

09-23-2009, 11:31 PM	#25
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	If the idle is above 750 and the engine is warm, the BAC should be shut. If you unplugged it and the pulsation didn't go away, I doubt that it is the issue. The stock ECU has a 'hole' in the timing map to make the engine idle down while getting excessive air and fuel (5 degrees ATDC). If I program a similar hole into my Haltech, it will do the same oscillations if I set the idle too high. Seriously, try adjusting the idle down to 750 with the check jumper connected and then see what it idles like. This still doesn't explain why the engine is running at such low vacuum. You said that it revs very quickly from idle if you floor it? Are you sure that the timing is correct? By press the TPS in all the way, you mean floor the gas, right? Pressing in the TPS without moving the pedal shouldn't make the engine rev to the redline. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)