North American Turbocoupe Organization



So what does the ECU do when you lose the VAM?
matt f Offline
Member
#1
Long story short: Lemons race 87 mustang w/ 87 TC power. Yellow wire (I think) to VAM was cut by alternator pulley. Car ran like crap until we found it. Ran for about 4 hours sputtering ans backfiring. I'm hoping we were using too much fuel, rather than not enough.

Thoughts?
Ricky Bobby's Laughing Clown Malt Liquor" 88 Turbo Coupe'
2010 LeMons: 21st @ Capitol Offense, 17th @ Detroit Bull Oil Grand Prix.
Up in flames NJMP 2011
It's heart will beat again in an 87 Mustang!
2- 87 TCs, 1 88 TC, future race and support vehicles
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Jeff K Offline
Administrator
#2
No yellow wire going to the VAM. Was it a thick (10 ga) yellow wire?

PCM reverts to a sort of lambda N mode for fuel control with inop VAM, depending on TPS and RPM. Usually idles OK, and runs rich for safety. Without the VAM it will run like crap under boost, and often go lean.
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.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Jeff K Offline
Administrator
#3
Correction.... PCM reverts to Alpha N control, not lambda N!!
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.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply

matt f Offline
Member
#4
I was in the car in my 6 point belts. I do think it was a heavy gauge wire though.

So we were running lean for 4 hours or so???

Lots of sputtering and popping...
Ricky Bobby's Laughing Clown Malt Liquor" 88 Turbo Coupe'
2010 LeMons: 21st @ Capitol Offense, 17th @ Detroit Bull Oil Grand Prix.
Up in flames NJMP 2011
It's heart will beat again in an 87 Mustang!
2- 87 TCs, 1 88 TC, future race and support vehicles
Reply





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