North American Turbocoupe Organization



Strange Code 42.
Pete D Offline
Administrator
#1
I been slowly going through the new white TC. I had it smogged and it past but just barely on the nox. So I started by cleaning the EGR and the IAC (also had some minor elevated idle issues at times). Then threw in a new set of plugs. I had wires and PCV on order. Found the PCV was bad. Had a new spare in the drawer so no problem there. Around this time I started getting a CEL. Pulled the KOEO & CM codes. KOEO GOT 11 and CM got a 42 - HEGO always sees rich. The CEL only seemed to come on at idle or when braking with the car in gear. Upon accelerating it would go out Sometimes it would come on during very low speed cruise. Since it seemed to happen most during periods of high vacuum, I suspected a diaphram leak in the FPR. Pulled the line to the FPR and only mild smell of gas, but enough to want to check further. Put a vacuum pump on it and took it to over 21". It held vac. just fine. Put a fuel pressure gauge on
it and got 40 psi reference and 45 unreferenced. Right on the upper limit per Ford specs. Moved on to the TPS and adjusted idle and checked base TPS. It was .995V. Little high for my liking so I knocked it down to .925V for a final value. This also brought the idle down from around 1200 to 1000 when warm. Took it out for a mild flogging [Image: biggrin.gif]. No CEL. I can tell that it's running rich, the KS is pulling a lot of timing and that stock exhaust sucks. Fuel pressure does go up 1 for 1 with boost, no problem, but 60 psi fuel pressure for 15 psi of boost on an IHI is too rich for my thinking. Got home and pulled the codes again - no code 42. I'm thinking of throwing on another stock FPR to see if I can bring the FP down 4-5 psi. Kind of want to get FP adjusted before I play without the KS.
Pete Dunham


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Ryan H Offline
Posting Freak
#2
Pete, I also had the same issue with the CEL getting 42 when I was slowing down or idling and it would go away shortly after I started moving again. Part of it was the TPS and another part was the FPR, reused old plugs, and a really bad PCV. The FPR was bad enough that the car was bucking and stuttering under any acceleration and it wouldn't cruise at all...

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Ryan Harris

88 TC, 5 spd, B&M Ripper Shifter, Walbro 190 LPH, Aeromotive FPR, K&N, 3.73 rear, KS disconnected, BCS bypassed, 89K miles, shattered clutch Big Grin
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
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Pete D Offline
Administrator
#3
Actually mine ran pretty smooth. If it hadn't been for the CEL I would say nothing else was real noticable
Pete Dunham


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JT Offline
Posting Freak
#4
Pete, is this an A4LD version? i wouldn't think you'd have one, but with your reference to the car being in gear, and with the symptom, i thought maybe you have an A4LD with stated EEC.
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Pete D Offline
Administrator
#5
JT, Your right, I wouldn't want an A4LD. This one is a 5 speed.
Pete Dunham


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88birdmobile Offline
Member
#6
edit: nevermind I misread


[This message has been edited by 88birdmobile (edited 09-07-2005).]
88TC rebuilt a4ld, 8ua, gillis @ 17, K&N on vam, stock size exhaust(dual flowmasters and no cat), 255 walbro pump, kirban afpr, HKS SSQV blowoff valve, T5 coming soon
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jmthunderbirdturbo Offline
Posting Freak
#7
jeez pete, you have another one....man. share some for the rest of us [Image: biggrin.gif] [Image: biggrin.gif] [Image: biggrin.gif]

moller
AM

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1987 5.0 sport coupe, intake, exaust.>for sale<
1987 tc, goldie, mods: mandrel bent downpipe to cat with turn down, gillis valve, 155 lph pump, kirban afpr, 100 psi fuel guage, handmade pvc cold air intake, optima. 15.457 @89.22(#24)(special thanks to turbocoupeturbo)(firedoctor)
1988 mazda truck, 431000 mi.
Buisness partner in Aerobird Motorsports.
APRIL 2018 - LOOKING FOR A NEW CAR. PM me if you have an 87-88 roller or cheap TF for sale.
1988 TC 5MT-Blue/Blue check-off car. resto-project.
2006 Honda Odyssey 5AT, baby-mobile.
2013 F-150, 5.0, 6AT, 4x4, snow white paint.
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Ryan H Offline
Posting Freak
#8
Pete, the CEL/42 just led up to the FPR breaking enough to cause the bucking... I drove it around for a few days and it got progressively worse. Installing the Aeromotive fixed it for the most part.. Until that broke too LOL

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Ryan Harris

88 TC, 5 spd, B&M Ripper Shifter, Walbro 190 LPH, Aeromotive FPR, K&N, 3.73 rear, KS disconnected, BCS bypassed, 89K miles, shattered clutch Big Grin
'88 TC Smile Walbro 255HP, Stinger FMIC, PIT BOV, Pro 5.0, Kirban, RR cam, FRPP strut tower brace, T3
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Pete D Offline
Administrator
#9
Ryan, The devil made me do it: http://natomessageboard.com/Forum3/HTML/001824.html
Pete Dunham


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Jeff K Offline
Administrator
#10
Fair chance the CM 42 will go away with fuel pressure reduced to near stock levels.

Check your VAF output voltage at 1000 RPM hot idle and see if it is over 1 V. Too high a idle VAF voltage tells the EEC more air is flowing in than actually is, and the EEC adds fuel, but then hits the adaptive limit, and turns on the CEL at idle. If VAF voltage is high, You can open the air bleed in the VAF to lower VAF idle voltage.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 23 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 04 Taurus Duratec (wifes car) // 91 Topaz (daughters first car)
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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