1991 Rough Idle/Misfire

[pgilliam1]

Are they in the FSM?

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 . I now see that there is nothing in the descrition field for the OBDI for those codes - my bad.

 

[Big_D]

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

That is not normal...my car would idle dead steady at 800-900.

 

[sollaris]

That is not normal...my car would idle dead steady at 800-900.

Its steady, when its started cold its around 1300 and settles around 800-900 once its warmed up.I should have been more clear.

 

[sollaris]

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 . 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.

 

[Larry Bastanza]

I'm not doubting the GURU here, but help me understand codes 71 thru 76. Won't OBDI cars see these?

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