Question about 1991 Volvo 240
Without being there...its difficult to diagnose...but....( just a shot in the dark) When you first crank it up, there is a cold start injector that sort of adds an extra shot of gas to help get it warmed up...then, it cycles off, perhaps answering the run ok when cold. Now....perhaps when engine begins to warm....this causes metal to "expand" allowing for a vacuum leak somewhere. Listen for an unusually loud hiss, or air being sucked in somewhere. All internal combustion engines produce vacuum when running, as the pistons...on the down stroke create this naturally. So....when a vacuum hose, connector, intake gasket (where intake mates to engine or any device mounted to the intake) comes loose, breaks, wears out....you have a vacuum leak that can cause engine to run poorly, or not at all. Also check for a egr valve stuck open.
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Posted on Jan 02, 2011
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Posted on Jan 02, 2017
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