1991 Rough Idle/Misfire

That's probably it then. It idles anywhere between 1300-800.

That is not normal...my car would idle dead steady at 800-900.
 
I printed this "Retrieving Codes using the Service Check Connector" document from a DIY post:

http://www.nsxprime.com/FAQ/DIY/trouble_codes.htm

I assumed it came from the wiki :confused:. I now see that there is nothing in the descrition field for the OBDI for those codes - my bad.

I have this printed out as well. I tried pulling codes when i was having the trouble with timing, etc and there were none.
 
I'm not doubting the GURU here, but help me understand codes 71 thru 76. Won't OBDI cars see these? :confused:

The code set in the WIKI is not catagorized by year. 1991-94 ECU's stop at code 59.

Again, without the misfire detection system install in 1995+, the ECU has no clue it is misfiring;).

Service Manual tells all:) These extended codes, misfire detection,etc. were a result of EPA mandate.

HTH,
LarryB
 
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