88 Turbo Coupe - fuel supply problem? - TCCoA Forums
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post #1 of 5 (permalink) Old 07-27-2011, 02:58 PM Thread Starter
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88 Turbo Coupe - fuel supply problem?

I have a stock 88 Turbo Coupe and it drives great around town. But if I try to get on it a bit, it'll flutter and lose power past about 3500rpm. Turbo spools great up to that point but once high boost is sustained for a second or two, that's when the fluttering starts. It's not nearly as bad when the engine is still cool and gets a little worse after it gets up to full temperature. I already replaced the fuel filter, put in new spark plugs (properly gapped), plug wires, dizzy cap and rotor (and proper timing), and a new timing belt. I've also tried running it with premium fuel. I'm thinking it's fuel pump/regulator/injector related. Any ideas?
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post #2 of 5 (permalink) Old 07-27-2011, 03:14 PM
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Pull your FP. In older {fox} models there's sometimes a hose type connection in the pump assy. I had one crack.
While you're at it, just replace the pump, anyway. Check the pickup sock.
Could also be the coil. Though bad coils generally balk at hard tip-in... dont wait a second as in your case.
Check for kink in your flex fuel lines.. both of them.
Regulator probably okay unless it leaks gas through the manifold port.

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Last edited by pettyfog; 07-27-2011 at 03:19 PM.
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post #3 of 5 (permalink) Old 07-28-2011, 04:25 PM
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Did you ever turn the boost up? Check the line to the wastegate. Make sure you're not running too much boost. Im not sure if those cars have fuel cut but that's what it sounds like.
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post #4 of 5 (permalink) Old 07-28-2011, 07:03 PM
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One easy thing to do (free, too) is to back-probe the TPS to observe the voltage output. With the ignition in KOEO (key on engine off), use your hand on the throttle to sweep from idle position to WOT. Observe the voltage output for any dead spots, which would wreak havoc on the EEC and other things. TPS units fail often on these cars.

There's a write-up in the technical articles at Turbo Ford for more detailed information. I had an '86 Cougar XR7 with the turbo 2.3 and battled this symptom on and off for a long time.
Once you do this free and easy test, at least you can rule out the TPS.

If the fuel rail has a Schrader valve (can't remember), you can always hook up to it and observe the PSI readings at idle with and without the regulator. That may help you with the fuel pressure idea.

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post #5 of 5 (permalink) Old 07-29-2011, 11:01 AM Thread Starter
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Thanks for the info guys.
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