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Discussion Starter #1
My friend had his car tuned with an SCT chip. It s a 95 5.0l AODE , 306 forged with J.E. piston,Vortech SQ-Trim @10psi , GT40 head , Explorer intake , crane 2031, 30lbs , throttle body 75mm and mafi 75mm Pro-m.

The car pull very strong, AFR is good in all range in WOT, the problem occure in idle or on a highway at cruise, in both situation the AFR still at 14.7 average and suddenly goes to 17:1 or higher for a second and it fall to 11:1 or lower and if we are at idle the engine shut down and it hard to restart, and if we are on a highway , after the up and down glitch the engine make a pop in the exhaust , sometime a big pop ,sometime it just jerk and return to 14.7 and run great.

Thanks for your advice
 

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may check your O2 sensors....dont think it's a problem with the SCT...
 

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Discussion Starter #5
The chip was initialy in my car , and was removed by the tuner.

i will change the O2 sensors tomorrow.

The tuner talk that is maybe the Pro-M , or the PCM. But when i remove the chip everything is fine.
 
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