North American Turbocoupe Organization



Missing/surging above 4000rpm...why?
Carcrazyscott Offline
Senior Member
#1
Guys, I just got my TC back together this past weekend after fixing an oil pan leak. While it was apart, I installed a new oil pump, pickup tube, and a windage tray. Well, I after I got it back together it seemed down on power at first, but now it seems to be running strong. Now though, it misses above 4000rpm. It does it in every gear, but sometimes it falls flat on its face in first and second. Almost like you pulled the wire off the coil. The rest of the time it just misses. Does anyone have any ideas? I changed the spark plugs, turned the boost down, changed the fuel pressure around and nothing helped. Right now I'm thinking the spark plug wires died. Please help guys, I'm installing Brian Bitter's old turbo tomorrow and I want this thing to be running right. Thanks

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'88 TC
ATR 3" dp, ATR 2 1/2" SS exhaust, K&N drop in filter, Ric Gillis valve set at 17psi, timing set at 12 degress, balanced injectors, Kirban AFPR, all else stock
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Jeff K Offline
Administrator
#2
Ya, try new plug wires, cap, and rotor. Use only Motorcraft parts. What is your plug gap set at?

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 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 // 00 Windstar (wifes vehicle)
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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Carcrazyscott Offline
Senior Member
#3
Quote:Originally posted by Jeff K:
Ya, try new plug wires, cap, and rotor. Use only Motorcraft parts. What is your plug gap set at?

They were at .35, but I tried .30 and there was no improvement. I'm really starting to think that it's the plug wires because it misses a little bit at idle now.


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'88 TC
ATR 3" dp, ATR 2 1/2" SS exhaust, K&N drop in filter, Ric Gillis valve set at 17psi, timing set at 12 degress, balanced injectors, Kirban AFPR, all else stock
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Kev Offline
Posting Freak
#4
Clean the IAC and don't forget to double check your connections around the intercooler. They can cause a vacuum leak that does exactly what you are talking about. Don't forget autolite copper plugs, motorcraft plug wires... very important.

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Kev
88 TC 5spd
K&N in front of the radiator, no mufflers, no cat=straight pipes all the way out the duals, bypassed BCS
Car is all black, no red stripe, blackouts, and chrome duals, red leather interior
Mean Fast and Smooth
Kev
1988 TC 5spd
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Glenn 88TC Offline
Posting Freak
#5
Quote:Originally posted by Carcrazyscott:
I'm installing Brian Bitter's old turbo tomorrow and I want this thing to be running right. Thanks


You just had to through that in there didn't you. [Image: wink.gif] When you're done I guess we'll have to lline them up.

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Glenn 88TC
current mods (14.096 at 97.29mph): ported & polished big valve head(1.89/1.59), ranger roller, gutted upper and ported lower intakes, t3/t4 turbo, MSD 6al, MSD Launch Control, K&N filter, Walboro 255 pump, Kirban adj. fuel reg., full 3" exhaust with Dynomax Ultraflow muffler, Star stage III ceramic clutch, Tiny Avenger bleed valve

Mods in progress (have, just not on yet): atr header, 65mm throttle body, 42lb. injectors, Taylor pro wires, 4.10 gears, Spearco intercooler, Nitrous system
NO TC and NO headaches.
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Carcrazyscott Offline
Senior Member
#6
Quote:Originally posted by Glenn 88TC:
You just had to through that in there didn't you. [Image: wink.gif] When you're done I guess we'll have to lline them up.


Yeah, you're having trouble with yours stumbling, I'm having trouble with mine stumbling. Hell, first one to get fuel or spark wins!

Back to the problems. I pulled the cap and it is a little worn. I'm going to get a new cap and rotor tomorrow. Is there anything wrong with running Jacobs Ceramic plug wires? I know that everyone says run the Ford wires, but it's BS to be replacing them every six months. At least the Jacobs wires have a lifetime warranty.



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'88 TC
ATR 3" dp, ATR 2 1/2" SS exhaust, K&N drop in filter, Ric Gillis valve set at 17psi, timing set at 12 degress, balanced injectors, Kirban AFPR, all else stock
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Pete D Offline
Administrator
#7
Don't know anything about Jacob's wires. How often do you have to change them?

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88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS.
Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges. New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and T-3. Centerforce II, KB subs and jack rails.
Pete Dunham


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Allan S Offline
Member
#8
I'll give you a hint Pete...

"the Jacobs wires have a lifetime warranty." [Image: tongue.gif]

Supposedly never. [Image: biggrin.gif]

Quote:Originally posted by Pete D:
How often do you have to change them?

SCMC Marketing Director
www.svtcobraclub.com

2004 Redfire SVT Cobra
87 TC RIP 10/2003.
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Kev Offline
Posting Freak
#9
I don't change MY plug wires every six months! That would be crazy unless your car racing is where you make your living. (pro-racer or something like that) About every 15000 miles or when needed. I haven't changed mine in 20000 and 5.0s are still dust just the same. And come on, is $25 bucks all that much over a six month period. Don't be cheap, give your car what it needs... or at least likes better.

Kev

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Kev
88 TC 5spd
K&N in front of the radiator, no mufflers, no cat=straight pipes all the way out the duals, bypassed BCS
Car is all black, no red stripe, blackouts, and chrome duals, red leather interior
Mean Fast and Smooth
Kev
1988 TC 5spd
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Glenn 88TC Offline
Posting Freak
#10
Quote:Originally posted by Kev:
Don't be cheap, give your car what it needs... or at least likes better.

Kev

I think your exactly right. Don't be cheap. By some wires that will actually make your car perform better. That's why I am going to buy the Taylor Pro 10.5mm wires. They have very low resistence and will allow all the extra voltage to get to the plugs. My car is heavily modified and Scott's will be soon too. I put wires on my car 3 times a year because they need to be replaced. I now run Autolite wires and have found them to be better than motorcraft for one reason. They have a lifetime warranty. Just pull them off and get them replaced for free. I think that the performance of my car falls off after the wires have around 1500miles on them. I always get a performence gain after installing fresh wires after 1000-2000 miles. Just my $.02

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Glenn 88TC
current mods (14.096 at 97.29mph): ported & polished big valve head(1.89/1.59), ranger roller, gutted upper and ported lower intakes, t3/t4 turbo, MSD 6al, MSD Launch Control, K&N filter, Walboro 255 pump, Kirban adj. fuel reg., full 3" exhaust with Dynomax Ultraflow muffler, Star stage III ceramic clutch, Tiny Avenger bleed valve

Mods in progress (have, just not on yet): atr header, 65mm throttle body, 42lb. injectors, Taylor pro wires, 4.10 gears, Spearco intercooler, Nitrous system
NO TC and NO headaches.
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