Mechanics

STARTS ERRATICALLY

1992 Volvo 740

Electrical problem
1992 Volvo 740 4 cyl Two Wheel Drive Automatic 140, 00 miles

I bought this car about 5 mnths ago and it has been giving me problems from the start. The frst time I drove it I got stranded at the grocery store. We replaced the battery and it seemed fine. I had the alternator checked and wad told the voltage it was putting out was low, but acceptable.
About a month ago I started having more problems. I went to the post office and came to no start, got a jump and went up and had the alternator checked immediately. Tests showed it was dead,
My mechanic dicovered that the previous owner had replaced the original alternator with one designed for the turbo 740 and rewired it so my mechanic replaced it with a turbo alternator.
The car started up fine and I took it up to make sure
both battery and alternator were OK. Both checked out fine. I drove 7 miles down the road and the car cut off while I was driving. The car would not start, but took an immediate jump.
The next morning the car would not start. Recharged the battery and car started. I drove 2 miles to Walmart and back. The next morning the car would not start.
My mechanic pulled the new alternator and replaced it. Recharged the battery. He drove it all over town. Turned it off and on without problem. He brought it to my house and, as we were talkng, the car cut out and would not start again.
He checked both the alternator and the battery and they are working fine.
What could be causing this problem?
Avatar
Dlinds20
December 11, 2008.




Hello
Thanks for the donation

Does the vehicle have electrical power when the engine stalls? Radio, lights, power locks/windows etc. Any of these work? Is there complete silence when you turn the key to start engine, or does it click or try to crank over?

Once I receive this info. I can better assist you. From the info I have so far, it sounds like it is either going to be an ignition switch issue, or a computer issue.

Bluelightnin6
Dec 11, 2008.
No I have no power whatsoever. If fact once when it stalled on me the first indication that there was a problem was I was going down the road and suddenly the radio went off. I looked in the rearview mirror and the antenna had retracted and siddenly the car stalled out on me. The car wouldn't restart, but started immediately when jumped off.

Tiny
Dlinds20
Dec 12, 2008.
Okay, has the mechanic who changed the battery for you checked the terminals for corrosion and faulty wiring?

One thing that is also scary to me is the re-wiring of the alternator. You should never use equipment not designed for the specific vehicle. I suggest having that wiring re-done back to the proper wiring, along with the proper alternator size. This could be playing a big role in your issues. It could be too many volts for your engine and may be causing harm to components such as your BCM (Body Control Module), which is the main " brain" so to speak. So if it fails, the vehicle will do nothing at all.

Also check the ignition switch control unit for power. Located under left side of dash, above steering column.
AD

Bluelightnin6
Dec 12, 2008.

AD