North American Turbocoupe Organization



Rough idle
Pete D Offline
Administrator
#11
The 02 was showing rich because the FPR was allowing too much fuel pressure.

Vacuum at warm idle should be 18-21 on a 4 cyl, with the needle steady.
Pete Dunham


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Keith Nubel Offline
Posting Freak
#12
When you disconnect the IAC does the idle drop off? I'm wondering why your idle didn't drop off when you disconnected the VAM. There is a noticable difference in mine when I disconnect the VAM.
1985 TC
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88blackbird Offline
Junior Member
#13
The idle did drop off when I disconnected the IAC. Almost to the point of stalling. When I disconnected the VAM nothing changed.
1988 TC - under construction
1987 TC - beater
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88blackbird Offline
Junior Member
#14
Hey guys,

I appreciate the help you all have given me so far. I have adjusted base idle and the TPS. I am assuming since there is no change when I unplug the VAM, that there may be a problem with it. If the problem exists throughout the tmeperature range could it still be a problem with the TFI? I am going to head back to the garage and do some more troubleshooting. I was wondering if someone could send me the procedures for testing the VAM and the TFI/PIP. Thanks again.
1988 TC - under construction
1987 TC - beater
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88blackbird Offline
Junior Member
#15
One thing I have neglected to mention is that all this started happening after I drove through a huge puddle. After that it started to sputter and died. It has had the idle problem ever since.
1988 TC - under construction
1987 TC - beater
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Jeff K Offline
Administrator
#16
Check TFI connector pins for corrosion, pushed out pins, etc. Have you tried wiggling the TFI connector with motor idling and see if you can get it to miss?
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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