Question about 1991 Volvo 240
My 91 volvo240 has just failed on me. The coil and injectors are not being pulsed. The engine turns on cranking and the TDC sensor pulses so I assume the signal is getting to the ECU.
The diagnostic plug unit lights when you press the button but displays no codes. I get no response and all the fuse board fuses are OK.
Any ideas on how to confirm this before I commit to an expensive repair?
About a year or so ago, my 1991 240 Volvo was experiencing similar symptoms. Has this been an intermittent problem? (Sometimes starts, sometimes not?)
I looked at my fuses, especially fuse #6 which powers my fuel injector relay. With a friend, who is a professional mechanic, we determined fuel was getting to the injectors, but my coil spark was weak and injectors were not being pulsed. I wasted 300 dollars having the injector relay replaced, by another mechanic. Two weeks later, my car failed once again to start! It turned out to be a pitted connection at fuse #6! I inially just looked at the fuses, which were not blown, but when I took #6 out, it and the associated connector were pitted. Burnishing the connector and replacing #6 fuse has corrected this issue! If you haven't, pull your fuses, and inspect and clean the contacts! Maybe it's just that simple. Good Luck!!
Posted on Dec 19, 2008
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Posted on Jan 02, 2017
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Mine was running fine driving 70MPH on the highway and just shut off. Now it cranks, fuel pump runs and it seems to be getting fuel but still no spark. I have a coil/module on order and will try it tomorrow.
Replaced the coil. Coil sparks once when you first turn the key on, that's it. crank sensor has already been replaced yesterday.
Injectors seem to fire (I smell fuel if I crank it a while) but still no spark.
I have 12V to the coil and 12V when cranking.
I see tons of posts with this issue but no resolutions. Come on somebody has to have been here before....
I do NOT have an injector pulse or a pulsed signal to the coil. When I crank the car the oil pressure light blinks on and off (just noticed this not sure if it is relevant)
I do get a check engine light when I turn the key on and when cranking, thought this meant ECU was good?
Any other way to test the ECU?
Could the pick up in the distributor be bad? Doesn't the pick up signal the ECU to fire the coil and injectors, I thought the crank sensor was just a TDC reference point?
Mar 15, 2013 | Cars & Trucks
May 10, 2014 | 1991 Volvo 240
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