problem with y8 intake manifold swap- running rich
#1
problem with y8 intake manifold swap- running rich
i swapped my IM out for a y8 one this weekend, it seemed to go pretty smoothly even though since i was using only a bare manifold i had to fabricate a lot of parts (ie a bracket to hold the throttle cable, iacv electrical hookup, drill into bottom plate, relocate IAT sensor, run a T for a coolant line, etc...) but when i start it up, only problem i'm getting is i'm running really rich, and missing a little. A/F sensor is reading the last green LED (way rich), and not only does it smell rich but it is smoking real bad, filling my garage w/ white smoke. what would cause it to run rich like this w/ only a new intake manifold? is the smoking related to having a cleaned-out manifold w/ no carbon or oil deposits? i'm hoping resetting the ECU will help a little, what else should i try? i just can't understand how a new IM would make it run richer...
I did relocate the IAT sensor (back bottom right of the b7 IM looking from front of car, a white plug w/ a white probe sticking out of it). i drilled into my CAI and plugged it here using the original gasket and RTV sealant- the liquid gasket stuff. i know for a fact it isn't leaking, but could the new reading be different than the way the original sensor would read (since now it's b4 the throttle body instead of after it)?
I did relocate the IAT sensor (back bottom right of the b7 IM looking from front of car, a white plug w/ a white probe sticking out of it). i drilled into my CAI and plugged it here using the original gasket and RTV sealant- the liquid gasket stuff. i know for a fact it isn't leaking, but could the new reading be different than the way the original sensor would read (since now it's b4 the throttle body instead of after it)?
#6
Re:problem with y8 intake manifold swap- running rich
no what it is is the coolant passage that goes thru the head isn't sealing... i just took the intake manifold back off and sure enough, traces of coolant in #4, and just #4. i've looked at the haynes manual enough to know that i'm 100% positive my coolant/vac lines are right on the money. i dont know what to do about it, i got the y8 gasket that matches up to the bigger hole but it still has a tiny spot where it overlaps... i'm gonna be so pissed off if i cant get it to work, i spent a whole day fabricating the parts to make everything mount up right.
#7
Re:problem with y8 intake manifold swap- running rich
i'm thinkin maybe put a bitchload of rtv sealant between the head side of the coolant passage and the manifold just making a circle around the coolant passage and hope for the best...
#8
Re:problem with y8 intake manifold swap- running rich
Make sure the head surface is CLEAN, all the old gasket is removed all around the studs, and the manifold has to be clean as well. A little rtv is ok, and be sure to tighten the manifold bolts from the middle out. And overtorque them if you want, I always do =)
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pa2play
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06-28-2004 04:24 PM
brax90si
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06-06-2004 07:22 PM