When I got into work tonight, one of the guys mentioned that he had spent the day working on his son's car. It's a 1992 Volvo 240 with 200k+ miles on it.
He said that it was running really rough. He replaced the fuel filter and now it won't even start. He pulled the plugs and all were wet with fuel. He does have spark at each cylinder, though. Pugs and wires are only a year old.
Any suggestions as to where to look next?
is it making compression? was anything recently done to the valvetrain?
Timing belt had jumped and finally broke? Replace and go.
Bad fuel pressure regulator? Bad coolant temp sensor?
No valve train issues. Timing and timing belt are good.
He's going to check the compression tomorrow.
I can understand the fuel pressure regulator, but why the coolant temp sensor?
The ECU uses the coolant temp sensor signal to trim the injector pulse width at cold start and warm-up. (Some cars with Jetronic LH2.4 had a cold start injector, too; I'm not sure if the '92 240 did, though.) If the sensor is bad, the ECU can conclude that it's extremely cold outside and, in turn, has the injectors squirt way too much fuel in, flooding the engine.
Thanks. I'll pass that one on.
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