ok I just got my car started (95 LT1 in a 87 firebird) since I had it bored to a 12.5:1 compression 383. I also sent my computer out to PCMforless to get reconfiguered for the compression and added cubic inches. Now I am seeing code 97 4K pulses per mile fault? I have replaced the VSS sensor and still the code shows up. Other then the added engine changes I put in a different ignition box, Malory hifire to control the nitrous and rebuilt the tranny. Is the ignition causing this code? Is it in the computer? tranny? I have races this saterday what could happen if I run with this code?

Any Ideas?
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code reads on computer: 97 4K pulses per mile fault (QDM)




95 LT1 and 4l60e
in a 87 firebird
----------
code reads on computer: 97 4K pulses per mile fault (QDM)




95 LT1 and 4l60e
in a 87 firebird

 

code reads on computer: 97 4K pulses per mile fault (QDM)




95 LT1 and 4l60e
in a 87 firebird

 

Does the speedometer show anything? Does it show correctly? What sensor did you replace the VSS with? The 3rdgen or 4thgen sensor?

If you run with a speedometer code, it won't hurt anything. Except, your tranny might not lock up the TCC in O/D.

Lou

 

The speedo has never been hooked up in this car. I bought the cable -x to convert from an electronic to a mechanical speedo I just never hooded it up yet. But last year I never had this code and the speedo was the same way, unhooked.

As for the sensor I replaced it with it looks the same as the 95 4l60e sensor.

I also checked the reference voltage going to the vss and it is 5 volts, right where it should be.


Any ideas?