Warm Start Symptoms-Please Help

Phil Rose pjrose at frontiernet.net
Sat Aug 17 13:29:05 EDT 2002

Sounds like a loss of fuel pressure. You've described a common
symptom-- in fact it's the one now afflicting my wife's car (but I
haven't fixed it yet.) :-(

My understanding is that slow internal leakage somewhere in the fuel
system allows the fuel-line pressure to eventually drop low enough
(in hot weather and/or a hot engine) for a vapor bubble to form. Most
often, it's claimed that pressure loss is from a defective check
valve (located on/in the fuel pump). This check valve is external to
the oem pump (i.e., can be replaced separately), but is built into
the slimline replacement pumps.

Other causes could be leakage at one or more injectors or in the
fuel-pressure regulator.

The idle speed "hunting" sounds like another issue. Is the A/C turned
on? Perhaps a balky ISV (idle stabilizer valve)?


At 7:59 AM -0600 8/17/02, Grant Dion wrote:
>Can anybody tell me if problem is a Hall Sensor or a Fuel pressure issue, or
>another likey suspect?....My 200tq starts right up when it is dead cold.
>When it is dead cold, after it starts right up, it often hunts for the
>correct idle, tach goes from i'd say 800-1200 RPM. Eventually hunting stops
>and car runs fine. If I drive it until the temp is normal, when I shut down
>and start it after only  a few minutes it will start right up, but if I let
>it sit for anywhere from 1-5 hours, (that is an educated guess) it is very
>hard to start. . I crank it for 10-15 second bursts, then usually on the 3rd
>one it starts. When it does start is stumbles for a couple of seconds, then
>runs fine.
>Any Help is greatly appreciated.
>Grant Dion in Colorado Springs
>200q20v mailing list
>200q20v at audifans.com
>End of 200q20v Digest
>200q20v mailing list
>200q20v at audifans.com


Phil Rose
Rochester, NY
mailto:pjrose at frontiernet.net

More information about the 200q20v mailing list