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R131 code 700 1991

posted by  e26pt2 on  Fri Jan 23 11:57 CST 2009
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last visit: Fri Oct 19 13:10 CST 2012
[RELATED]

This has my tech and I completely stumped.
1991 740 sedan, 225170 miles.
My car has had two episodes of cranking but not turning over. My tech had tightened some loose ignition wiring after the first incident...computer diagnostic had shown the R131 code for "no rpm". Once the wiring was tightened the car fired right up. The starter, alternator, battery, fuel pump,fuel pump relay, and all other systems checked out fine.

The same thing happened a couple of weeks ago...same code, all other systems OK. My tech pulled the #1 fuse out, waited a couple of minutes, re-inserted the fuse, and the car started right up. He did this on a hunch as he was at a complete loss; the fuel injection system had checked out fine. We are both stumped and want to know if anyone else had encountered the same problem. He seems to feel it might be a computer/memory issue.

I live in a mild climate; both episodes occured when it was about 65-69 degrees.

The car is in excellent shape with the exception of this one quirk..we are both puzzled.


thanks,
E
1991 Volvo 740(Nigel) 225,170 miles






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New R131 code [700][1991]
posted by  e26pt2  on Fri Jan 23 11:57 CST 2009 >


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