Think I may have figured out my cars ailments!!
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Joined: Mar 2002
Posts: 4,827
From: Waynesboro, PA
Think I may have figured out my cars ailments!!
Ok, someone PLEASE tell me I'm on the right track here.
I played with the IAC passages (copper tube mod on the BBK 58mm) and the throttle stop.
Fired her up cold, went through the setting routine a couple of times, got the idle set almost dead on and the IAC at 41, and my map was hovering right about 15.0 in hg at idle.
THEN!!!! (there's always a then), I watch it. Map starts coming up to about 17.5-18.5, IAC gradually closed to 0, and idle took a move up to about 1100 from 800, , O2 mV started to move up from 450 to about 650+, all in open loop while the car started to warm up, all the indications of the problems I've been having.
Could an external/internal vacuum leak cause this????? I think large vacuum leak because as the car warms up, things expand. As they expand, a gap may form. A possible large vacuum leak behind the TB somewhere, letting enough air into the system to drive the IAC shut, raise the idle, and cause the computer to dump a bunch of extra un-needed gas in, giving me my extremely rich problem.
If this is the case, I think it may be on the left side somewhere, this is why: I played with the tune and drastically raised the injector constants. The left side stayed bottomed at 108 while the right was split and up in the 1-teens. With the regular tune, they're both dead at 108.
Feasible??
I played with the IAC passages (copper tube mod on the BBK 58mm) and the throttle stop.
Fired her up cold, went through the setting routine a couple of times, got the idle set almost dead on and the IAC at 41, and my map was hovering right about 15.0 in hg at idle.
THEN!!!! (there's always a then), I watch it. Map starts coming up to about 17.5-18.5, IAC gradually closed to 0, and idle took a move up to about 1100 from 800, , O2 mV started to move up from 450 to about 650+, all in open loop while the car started to warm up, all the indications of the problems I've been having.
Could an external/internal vacuum leak cause this????? I think large vacuum leak because as the car warms up, things expand. As they expand, a gap may form. A possible large vacuum leak behind the TB somewhere, letting enough air into the system to drive the IAC shut, raise the idle, and cause the computer to dump a bunch of extra un-needed gas in, giving me my extremely rich problem.
If this is the case, I think it may be on the left side somewhere, this is why: I played with the tune and drastically raised the injector constants. The left side stayed bottomed at 108 while the right was split and up in the 1-teens. With the regular tune, they're both dead at 108.
Feasible??
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