North American Turbocoupe Organization



Results of code 42 troubleshooting
Salida Geoff Offline
Junior Member
#1
I know this much now:
* engine timing is perfect
* spark looks good
* old spark plugs reeked of gasoline
* vane voltage 0.97 or so volts
* fpr appears ok, no liquid gasoline, very faint smell of gas
* engine-off fuel pressure 38 psi

Engine will absolutely not start. It tries, sputters, coughs. Does seem flooded.

Am I down to the engine control computer? Should I replace fpr anyway? Anything else? Recommended computer?

Thanks so much,
Geoff Whitney
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Not B Anymore Offline
Administrator
#2
Did you check for dislodged/torn hoses between the VAM and throttle body? Will it start with the VAM unplugged?
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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Salida Geoff Offline
Junior Member
#3
Please tell me where the VAM would be unplugged
Please tell me which hoses go between the VAM and throttle body
Any hoses I can find are in excellent condition.
I'm beginning to think I don't know what the VAM really is and where it is. It is directly connected to the throttle body, right? or no? I have never seen a picture of a labeled VAM on this website.
When I manually move the throttle full open to full closed, I hear loose, sloppy rattling on the passenger side of the fire wall.
Comments, directions?
Thanks,
Geoff Whitney
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Salida Geoff Offline
Junior Member
#4
OK, I found the VAM. Please disregard the previous message.

Geoff Whitney
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Jeff K Offline
Administrator
#5
Have you tried starting it with the gas pedal about 1/4 way to the floor?

Have you checked for injector pulse on all 4 injectors using a NOID light?

As noted above, ECT voltage would be a good thing to know.

Have you checked TPS volts to be sure it is a little under 1.0 V at closed throttle and increases smoothly to 4.5V or so at WOT?

I am still thinking you have a bad vacuum leak somewhere that you havent found yet.
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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