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Old 08-10-2017, 02:33 AM   #1
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Join Date: Dec 2014
Location: Los Angeles, CA
Default 1991 240 hard start when hot and hunting idle for a few seconds after

I have an issue with starting my '91 240 when hot.. it cranks for a couple seconds and when the engine fires the idle hunts until I rev the engine once and then it idles well. Cold starts are perfect. I put a new FPR in 9 months ago, I checked the resistance on the coolant temperature sensor and the MAF (both are in spec), injector o rings are less than a year old, vaccuum lines are a month or two old, fuel filter was done 6 months ago, the throttle body was cleaned about a year ago and there are no codes. What's left to check? IAC valve?

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Old 08-10-2017, 09:47 AM   #2
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Join Date: Sep 2012

It does this when the AMBIENT temp is hot, or the motor is hot?

Sounds like vapor lock to me. What's your fuel pressure like?
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