North American Turbocoupe Organization



Code 42
Salida Geoff Offline
Junior Member
#1
88 TC, Code 42, sputters & dies, will not even idle.
I'll bet there is lots of experience out there in TC land
on what fixes a code 42, system rich problem. Any quick
suggestions for troubleshooting will be much appreciated.

Wouldn't it be cool if we had a table of EEC codes with common
fixes which have worked? Perhaps there is one on this site.

Thanks so much for any input,
Geoff
Geoff Whitney
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Pete D Offline
Administrator
#2
Diagnostic listing for codes: http://www.tbirdheritage.com/turbocoupe/...-Chart.php

Did you get any other codes?
What, if anything, preceded this problem? Did you do any maintenance? Was the problem onset gradual or all of a sudden?

Pull the reference line off the fuel pressure regulator on the fuel rail. See it the line has gas in it or the strong smell of gas in it. If yes, the regulator is shot. Replace regulator and run fuel system diagnostics. If the smell of gas is faint, regulator may be OK, see if you can run some or all of the fuel system diagnostics: http://turbotbird.com/techinfo/Fuel_Syst...ostics.htm

Pete Dunham


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Salida Geoff Offline
Junior Member
#3
No other codes, Pete. Nothing preceded it, no maintenance
performed. Onset was all of a sudden. Fuel pressure regulator did not have gas in it and did not smell of gas. Looks like the fuel system diagnostics mostly check for lack of fuel. I won't be able to perform them myself and code 42 suggests an excess fuel problem.
Geoff Whitney
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Jeff K Online
Administrator
#4
Did you get the code 42 as part of the KOER test or the CM test?

Many causes for this code. Leaking FPR, failed FPR causing excessive fuel pressure, vac leak in vac line to FPR causing high FP at idle and cruise, VAM indicating higher than actual airflow, TPS volts indicating larger throttle opening than actual, leaking injector or injectors.
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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Salida Geoff Offline
Junior Member
#5
KOEO test. Don't know what a CM test is.

This car had been running great but has not had a tune-up
this century. So, it has old plugs, old wires, old distributer cap and rotor. New TFI which fixed last year's problem. I'm ready to do a full tune-up but I've never moved the intercooler before. Does that removal entail disconnecting an AC line?
Geoff Whitney
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Scott Mabe Offline
Member
#6
KOER is with the engine running, CM is stored codes that are pulled when the engine is off but ignition in the run position.
1987 Turbo Coupe
1988 Thunderbird parts car/ possibly street/strip car
1990 F-250HD 460ci
2001 Pontiac Montana (wife's ride)

-PLEASE FORGIVE TYPOS, I USE SWYPE ON MY PHONE-
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Jeff K Online
Administrator
#7
More detail on what Scott said.... CM codes are the codes that come out during the second part of the test, after the separator pulse. The first part of the KOEO test indicates current faults, while the CM portion of the test indicates a fault not currently present, but was present within the last 40 to 80 drive cycles (warm up and cool down cycles). Some peple call the CM codes "history" codes.

No need to disconnect the AC lines or anything else to remove the IC, except the 2 vac hoses attached to the IC and the loosening the clamps on the IC hoses. Difficult the first time or 2 you do it, but with practice, you can have the IC off in 2 minutes or less.
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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Salida Geoff Offline
Junior Member
#8
My code 42 was a CM code, already saved when I started trouble shooting. I cleared the codes and I don't get any new ones when I try to start my TC. I can't keep it running for the 15 seconds required for a new code to be saved. I'm starting a long-overdue tune-up, got cap, rotor and plugs. Haven't found Motorcraft plug wires yet (are they really essential?).
Thanks, Everyone
Geoff Whitney
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Pete D Offline
Administrator
#9
These cars are kind of picky about plug wires. There are a few different brands that work but the Motorcraft are among the best. Try rockauto.com
E8PZ-12259-A IS THE fORD P/N

WR-4011-C is the Motorcraft #. Both numbers appear on the box.

I just ordered a set from them
Pete Dunham


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Salida Geoff Offline
Junior Member
#10
Thanks, Pete

I've got mine on order too.
Geoff Whitney
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