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My 940 GL hasn’t been running right ever since I ran a bottle of Lucas injector cleaner through the tank. It sputters badly at idle (and fluctuates, though it had fluctuated slightly before this is much worse) and it will sometimes stall when I put it in drive. I replaced the injectors, cleaned the throttle body and idle air control valve, and replaced the knock sensor (engine was throwing a code for knock sensor and also no signal from speedometer, Fuel trim (lambda control) too lean or too rich at idle, and Fuel trim (lambda control) too lean at part load). If I can get it moving (more often than not), it will crawl until about 2.5k RPM at which point it will take off as normal. Also, below 2500 RPM I hear what sound like a grating noise coming from about where the catalytic converter is– any chance that’s clogged and is the culprit? I plan to do the test outlined in Eric’s video tomorrow.
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Sounds like a possible vacuum leak.
Check it out ….http://www.youtube.com/watch?v=9CPqbaSgcok
Also be sure there are no cracks or splits in the air intake hose between the air filter and throttle body.
Thanks for the responses. I tested fuel pressure, should be 44 PSI but is 41 at idle. When I hooked it up it was at 0 with a cold engine but it stayed at 40 for awhile after shutting the car off. It looks like the fuel filter has never been replaced so I plan to order one.
I also considered a vacuum leak. Can I do the test outlined in the video with throttle body cleaner, or do I really need to get some carb cleaner?
I meant to respond to this days ago….
I bought some carb cleaner anyways, and sprayed all around the vacuum hoses (with the engine cold to minimize the risk of fires). Nothing.
I have ordered a new fuel pump relay (they often go bad on these cars, and mine did test partially bad) and fuel filter. They both should arrive Monday. If neither of these fixes it I will be looking at a new car. I’ve just dumped so much money into this car (started off as a $1000 car, now have probably more than that invested) that I don’t think it’s worth it. Besides, I’d rather have something with more power and a 5 speed. I’m looking at first-gen Foresters, but I probably won’t bite unless the head gasket has already been replaced (a common failure point on those cars).
If I go that route, I will miss the extreme ease of repairing. Every part is just so accessible on the Volvo; as Eric’s Subaru videos have shown, with a Boxer engine that just isn’t the case. I believe I read somewhere changing the head gaskets requires pulling the engine. Aye.
Another option is an early 90s Camry, the third (XV10) generation to be specific. Problem is they’re hard to find with a V6 and a 5 speed. I’m also looking at Ford Rangers but I find it hard to justify owning a truck hehe.
If you rev the engine up at idle, does it run normally? If so, there is a possible vacuum leak (I know you checked, but you never know) or the IAC is bad. Cleaning the IAC doesn’t fix a broken one.
Also, check the fuel pressure as the car stalls to ensure the pressure stays at the specified level.
I also like your idea that there might be a restriction in the exhaust. You can test for this with a vacuum gauge.
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