1991 740 no spark
#1
05-27-2010, 05:16 AM
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1991 740 no spark
Help; 1991 740 no spark. I did a search and didn’t find the thread with the cure yet.
My daughter, for her first car, bought a 1991 740 non-turbo that has ~135k miles She has driven it very little while she is fixing some of what was broken by the previous owners.
Problem: Periodically the car started dying. Sometimes it could be restarted instantly, sometimes not, but would later. Since it happened randomly I hooked my timing light to it and waited for it to stop. It is a spark issue. Cam shaft is turning, and I am not if there are, or how to read, any codes.
I do hate the thought of asking for help on a subject that has been discussed before, especially for my first post
, but can someone advise me or direct me to the thread(s) that will help?
Thanks in advance,
James
My daughter, for her first car, bought a 1991 740 non-turbo that has ~135k miles She has driven it very little while she is fixing some of what was broken by the previous owners.
Problem: Periodically the car started dying. Sometimes it could be restarted instantly, sometimes not, but would later. Since it happened randomly I hooked my timing light to it and waited for it to stop. It is a spark issue. Cam shaft is turning, and I am not if there are, or how to read, any codes.
I do hate the thought of asking for help on a subject that has been discussed before, especially for my first post
, but can someone advise me or direct me to the thread(s) that will help?Thanks in advance,
James
#2
05-27-2010, 08:20 PM
Go to www.stepbystepvolvo.com and download free 740 no-start guide. No spark is usually due to (1) rpm sensor (in your case; Hall sensor 1988 or earlier), (2) Power Stage, (3) ignition coil, or (4) wires leading to above.
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