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Diagnostic help needed: 90 744 GL, check engine light 700 1990

posted by  austi012 on  Wed Nov 28 12:07 CST 2007
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last visit: Sat Jun 9 05:38 CST 2012
[RELATED]

Hi,

I bought a 500 dollar 1990 740 GL last week. The car has 225000 miles and no records. (I bought this car as a stopgap driver (that I may keep... LOL) because I hit a deer 2 weeks ago at 50 mph in my 95 Porsche 993 C4 and I won't get that car back until January). This is my 4th Volvo I've owned... I love the things.

The symptoms are these: periodically, when the car is fully warmed up, the check engine light comes on. Driveability is unaffected. The car starts fine, warm or cold. The light also goes out periodically. At the same time the light comes on, my passenger-side speakers mute WAY down. Related?

The car has the REX1 ignition and Regina Fuel system.

I ran the diagnostic codes. I got nothing but 1-1-1 from socket 6 (the ignition). From socket 2, I got 2-2-1, 3-2-1, and 2-2-1 again.

A few more data points: the car is getting TERRIBLE mileage (although I'm running the first tank), I'm estimating about 12 mpg. The O2 sensor looks 'newer'. I checked for vacuum leaks and fixed a couple. No change. New air filter.

Last item: wen I ran the car through the high-pressure wash, I could hear water trickling and saw a few drips on the passenger side footwell. (I resealed the windshield with silicon caulk last weekend). I'm hoping the computer hasn't gotten wet and corroded. It's been bone dry here for days though, and the light comes and goes.

What say ye? Radio suppression relay? Bad wiring? Something else?

thanks very much

Thaddeus






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