North American Turbocoupe Organization



Top misfiring
FastN'Fried Offline
Senior Member
#1
About a month ago I scored a great deal on a 1988 turbo coupe canyon red with a 5-speed. I've since been fixing little things here and there and reversing PO's "Mods". I found he had v8 plugs in, not the 4 cylinder ones so I swapped with a set of copper motorcraft plugs. He said he had the timing advanced so I've been turning it back in small increments but can't seem to get ride of the miss. I've turned the boost down from 17psi to 14 or 15 and that doesn't seem to help. Pulls and spools good with part throttle but wide open starts randomly missing missing after 4K rpm. Vac lines feel solid. Any ideas?
1988 Canyon Red Turbo Coupe
Carrillo pistons +.030, ARP hardware, 3in exhaust, and a magnaflow
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Pete D Offline
Administrator
#2
What kind and how old on the plug wires? We recommend the Motorcraft wires: Motorcraft: WR-4011-C
These things are temperamental about plug wires. Lots of brand don't work.
Pete Dunham


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FastN'Fried Offline
Senior Member
#3
Good to know, no they're not motorcraft. I would like to do a CoP setup in the future or a coil pack at the least when I switch to pimp.
1988 Canyon Red Turbo Coupe
Carrillo pistons +.030, ARP hardware, 3in exhaust, and a magnaflow
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t-bird88 Offline
Senior Member
#4
This sounds like to me that you have a problem with the VAM. Mine does the same thing. I dug around through my spare parts and found another one and the full throttle miss went away. But as of late, it has came back. So for me, a MAF is in order.

Jim B Big Grin .
Gunmetal Grey 88 TC!!!!
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FastN'Fried Offline
Senior Member
#5
Man I can't wait to ditch that thing! I really want to PIMP it lol

I've read a MAF swap isn't easy without aftermarket engine management, is this still true? I have a 90mm lightening MAF lying around I would love to put on.
1988 Canyon Red Turbo Coupe
Carrillo pistons +.030, ARP hardware, 3in exhaust, and a magnaflow
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Tbird73 Offline
Member
#6
would a maf and throttle body from a 2001 v6 f150 work?
Greg Corriveau
1987 Black TC stock
--------------------------------
God is First ...... I am Second
Plain and Simple!!!
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FastN'Fried Offline
Senior Member
#7
Any MAF could be made to work, I would try to find a 6-wire though.
1988 Canyon Red Turbo Coupe
Carrillo pistons +.030, ARP hardware, 3in exhaust, and a magnaflow
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Not B Anymore Offline
Administrator
#8
It is not easy to get a MAF to work right with the stock electronics. Jeff K knows a lot more about this than I do. With aftermarket engine management like the Pimp it is unnecessary since the Pimp uses a MAP sensor instead.
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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Sophosis Offline
Member
#9
Swapping to MAF definitely isn't plug and play.. and it will need to be tuned, that's a requirement. I'm running an '03 Focus slot MAF in my setup. Quarterhorse on LA3 using a MAF binary that includes the additional MAF backflow code.
1988 Turbo Coupe
- 0.020 Diamonds w/stock rods, T3 w/stock IC, BoPort 1.5 cam, LA3 w/QH on MAF, water/meth
- 5-lug swap, 31-spline, 4.10s, vacuum brakes, PBR front brakes, 2000 Mustang GT 17" rims
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FastN'Fried Offline
Senior Member
#10
Plug gap was wayyyyyy off. Regapped to .035 and installed motorcraft plug wires. Still a tidbit misfiery after 4K rpms. Is there anyway I can rule out the VAM as the culprit? Vac gauge shows the motor pulling around 18 at idle.
1988 Canyon Red Turbo Coupe
Carrillo pistons +.030, ARP hardware, 3in exhaust, and a magnaflow
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