Question about 1989 Oldsmobile Cutlass Cruiser

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MPFI having vapor lock problems?

Three days ago after a short stop for dinner at KFC, the 89 Olds w/ 2.8 and MPFI wouldn't fire up. The next morning it fired right up like normal. At home once it was shut down it refused to go again. Next morning after overnight cool down it fired right up. I took a fuel pressure check and found it within specs. However, once it had warmed up the engine died on its own. Scan reading came up clean. Plugs still firing but no start. I know carbed cars have vapor lock issues with our present gas formula, but have never seen it in FI setups. Is it really vapor lock (sure acts like it is) or something else that isn't coding? Have had the car for 7 years with no prior problem.

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  • yadayada
    yadayada May 11, 2010

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Posted on Jan 02, 2017

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SOURCE: Acts like vapor lock

when they went to fuel injection the fuel that was not used returned to the tank thus cooling the fuel and ending vapor lock, my question is did you do a fuel pressure test? and di you do a fuel leak down test? and the first thing I would do is change the fuel filter. with ethanol in the gas it kills the filter. I have to replace mine every three months they just plug up from that junk. Other than that the only other thing would be a coil breaking down when it gets hot the coil shorts out when cool it starts so check those things first. be sure fuel pressure is 50 to 60 PSI and does not drop below 30 PSI for at least a minute, if it does the fuel pump check valve is bad, also the fuel sock could be bad as well.

Posted on Jun 25, 2009

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No! Don't even try it!!!! The wiring harnesses and the computers are all different! Besides, the pushrod motor is vastly inferior in longevity. Change the oil and the SOCH motor will last a LONG time... the pushrod motor will wear out after about 120,000 miles. Seen enough of them to know!

Posted on Jul 21, 2010

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when they went to fuel injection the fuel that was not used returned to the tank thus cooling the fuel and ending vapor lock, my question is did you do a fuel pressure test? and di you do a fuel leak down test? and the first thing I would do is change the fuel filter. with ethanol in the gas it kills the filter. I have to replace mine every three months they just plug up from that junk. Other than that the only other thing would be a coil breaking down when it gets hot the coil shorts out when cool it starts so check those things first. be sure fuel pressure is 50 to 60 PSI and does not drop below 30 PSI for at least a minute, if it does the fuel pump check valve is bad, also the fuel sock could be bad as well.

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