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Author
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Topic: Help with stalling / hesitation / stumbling problem
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BCINGUU
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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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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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92stangLX
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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?
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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BCINGUU
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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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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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BCINGUU
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Member # 2397
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posted
edit.
[ March 06, 2007, 04:25 PM: Message edited by: BCINGUU ]
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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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BCINGUU
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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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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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CA FiveOh
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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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91 LX Notch, AFR 165 heads, E303 cam, FRPP Cobra intake, 42lb injectors, intercooled ProCharger P1SC (9 psi), 3.73's, TwEECer RT
Posts: 39 | From: Fairfield | Registered: Feb 2007
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BCINGUU
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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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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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CA FiveOh
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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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91 LX Notch, AFR 165 heads, E303 cam, FRPP Cobra intake, 42lb injectors, intercooled ProCharger P1SC (9 psi), 3.73's, TwEECer RT
Posts: 39 | From: Fairfield | Registered: Feb 2007
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BCINGUU
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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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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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