T O P I C R E V I E W
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BCINGUU
Member # 2397
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posted
I have the following symptoms on my 90, anybody know what might cause this? Engine dies when slowing to stop, tries to die while idling, hesitates and medium throttle acceleration and stumbles like its falling on its face while backfiring through the intake under hard acceleration.
Datalog shows timing slams fully negative (-32 degrees) under acceleration, wtf. This is making me focus on possible timing related causes.
I have tried the following:
KOEO and KOER tests, no problems. (KOEO initially showed a code 22, replaced the BARO sensor and the code went away) New ECU computer (third one I've tried) Removed aftermarket chip, same behavior. New coil, plugs, wires Swapped distributors
Here is my combo:
347 Engine Trick Flow Twisted Wedge Heads Comp Stage 1 cam 221/225 .525/.530 112LSA MSD Ford Blaster TFI ignition coil OEM-style 93 Cobra MAF calibrated for 24# injectors Ford Motorsport 24 lb./hr. fuel injectors FMS Cobra upper and lower intake Cold air intake, K&N filter and MAF in fenderwell 180 degree high flow thermostat BBK Long-tube 1-5/8 inch ceramic-coated headers BBK Shorty H-pipe with hi-flow cats (CARB E.O. D-245-5) Spintech side-exit Mufflers TwEECer programmable EEC-IV tuner chip
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92stangLX
Member # 3252
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posted
Are you running lean? It kinda sounds like the computer is purposely pulling out a bunch of timing for some reason.
Do you have any codes?
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BCINGUU
Member # 2397
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posted
No codes any more after I got rid of Code 22.
I'm thinking of going Code 7A myself later today though.
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BCINGUU
Member # 2397
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posted
edit. [ March 06, 2007, 04:25 PM: Message edited by: BCINGUU ]
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BCINGUU
Member # 2397
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posted
Here is the resolution in case anybody finds this in the archives and wonders. Dirty MAF wire. Cleaned it and everything is fine now. And, the car just passed smog!!!
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CA FiveOh
Member # 7429
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posted
Did you put the 93 cobra MAF transfer in the Tweecer? I know you said the wire was dirty, but a poor transfer function will cause that also. Just curious.
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BCINGUU
Member # 2397
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posted
Yes, I have copied over the MAF xfer function from the X3Z on my 93 Cobra, which should be close enough I hope. I have also tuned my injector offset and slopes so my KAMRF correction factor is about 1%.
And, I passed smog yesterday! So it must be working right.
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CA FiveOh
Member # 7429
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posted
Damn, if you're at a 1% correction factor than your tune is pretty spot on. Cool!
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BCINGUU
Member # 2397
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posted
Yeah, I've spent a lot of hours tuning several cars over the last 5 years or so, and got pretty good at getting those 3 parameters to line up.
"Laptop tuning" isn't considered all that strange any more...
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