Hard Starting S 10 when warm

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Hartv427 - 30 Nov 2006 02:46 GMT

My 2000 Chevorlet S 10 2.2L with 106,000 miles start hard only when the
engine has been up to normal operating temperature turned off and
allowed to cool to approximatly 150 degrease (about 30 to 40 minutes).
Other than this condition it runs great. The fuel system has new pump,
presure regulator and filter. The system also holds it,s fuel presure
long after the engine has been shut off. The ignition has new plugs and
wires. IAC has been cleaned and temperature sensor has been replaced.
No service engine light.

Any advice Appreciated,

Dave

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Bob Urz - 30 Nov 2006 05:26 GMT

> My 2000 Chevorlet S 10 2.2L with 106,000 miles start hard only when the
> engine has been up to normal operating temperature turned off and
[quoted text clipped - 8 lines]
>
> Dave

Have you checked for good spark when this happens?

Bob

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sdlomi2 - 01 Dec 2006 15:52 GMT

> My 2000 Chevorlet S 10 2.2L with 106,000 miles start hard only when the
> engine has been up to normal operating temperature turned off and
[quoted text clipped - 8 lines]
>
> Dave

From the slight description, you'd not be wasting time to watch the
fuel pressure (rig a cheap pressure gauge if needs be) as it sits and cools.
Its pressure specs below. It's quite likely it holds pressure, yet not
ENOUGH pressure, and could easily show that symptom. Pressure will probably
drop below normal operating range as it sits; watch how long it takes to
pump back up to normal when you just turn switch to ON--should be almost
instantaneous. (Not carved in marble, but I personally like to see the
pressure hold to approx. 70% of normal for 60 seconds after turning it off
at the end of "your test drive".) BTW: that engine should have fuel
pressure of 41-47 psi when running. The temp. sensor which you mentioned had
been replaced should be 0.2-0.9 volts, idling and warmed up to operating
temp. Luck! s

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