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Frank, Auto Service Technician
Category: Car
Satisfied Customers: 3420
Experience:  33 years experience,25 with GM,14 ASE certifications,
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1991 olds cutlass: 3.1 no power runs rich crank sig..good fuel..pres

Customer Question

1991 olds cutlas supr. 3.1 no power runs rich crank sig. good fuel pres. good no codes grounds good tried ecm didnt change. car will idle but will not rev up.
Submitted: 7 years ago.
Category: Car
Expert:  Frank replied 7 years ago.
Do you have a scanner?
Customer: replied 7 years ago.
yes i have a modis and a tech 2 Data stream looks good seems like cyl dissapeer from scope when checking kv
Expert:  Frank replied 7 years ago.
You checked a few things-if the kv drops on accel.check with a sparktester and check the crank signal into the ic module-fuel control is the purple/white wire out of the module for rpm.Relook at the tps and maf sensors-you can disconnect and run them in back up.What I think is realy going on and was common is you have injectors that are shorting out-when that happens you will get no spark and the ecm resets-if you set a code in it it will clear the code when it resets.The injectors are 12.6 ohms ea/If you unplug the end corners you can test #1 and 6-then back probe the harness for the other 4 at 3hms.You ohms law on a series ciruict for 4 resistanc es.

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