My Mustang was dyno'd this afternoon and it was horrible... absolutely horrible. We could not get a good baseline pull.

2 MAJOR problems:

FIRST:
The engine always cuts out at around 4500 rpm, as if a rev-limiter is preventing it to rev any further. I had installed a brand new Crane hi-6s thinking that the problem was ignition and set the rev-limiter to 8000rpm.. Nope. I then removed my old Autologic chip did a pull. Same result. The dynograph shows the power building up to about 230hp or so then the graph drops like a rock. ala stock market crash.

Thinking that the distributor (Accel Billit) was a possible cause, I had installed a regular stock distributor. Same result! Power cuts out at 4500rpm in ALL gears! Note: The engine actually sounded less raspy with the stock distributor in comparison than the Accel Billit!

The only possiblilty left that we could think of is the ECC-IV itself. I ordered another A9L from Ford. It will arrive in about 10 days.

Has this happened to anyone else?

SECOND:
When the engine is reving hard approaching 4500rpm, smoke comes out of the engine! The smoke builds from the firewall and then exists mostly from the passenger side through the air filter; some on the driver side as well. I found that the PCV value popped open but it was still smoking after i pushed it in securely.

The tuner could not figure out why this was happening. Another tuner came in and also could figure out why this was happening.

The reason given to me was that the engine "is getting tired" (89,000 miles).

I find this reason unacceptable. I do not thash my 93 Mustang GT around and i kept it mint condition throughout the years.

CAN ANYONE HELP ME OUT? WHY THE HELL MY MUSTANG BEHAVING LIKE THIS???

We managed only to get about 230hp because of the engine cutting out at 4500rpm! **** poor results!

Please help if you can. I've had it.

Engine mods are below:
Stock 302 block, TFS Head Stage II CNC Ported, Stage II Billit Cam, 1.6 Roller Rockers, JBA Shortie Headers, Mac H-pipe, 2 Chamber Flowmasters, Crane HI-6S, PS1 Coil, Accel Billit Distributor, Vortech SQ-Trim 8lb Boost, Vortech Intake Manifold, 65mm Accufab Throttle Body, Ramair Dual Fans All vaccum and pumbing is secured.

Thank you.

 

valve Float?? Maybe the springs are getting weak

 

Hmmmm. There is some, not alot, but some usable RPM still available. You have done everything I think I would have done. How does the A/F look? 89k is not alot of miles and car should still be plenty strong. Heck, my 95 w/135k is still pushing out 240/306 no problem. I would like to say the valve springs are getting weak, but how can his go bad at 89k miles and mine still be strong at 135k???? What color is the smoke? Blue tint to it means oil. Try a compression test to see what kind of leakdown you have.

 

yeah unless its had a hard 89k i would think the mil;eage would hurt any thing mines a 91 with 130k on it and i ran mine all the way to 6k rpm with no prob and put down 218 RWHP woot