1990 Isuzu Trooper II 2.6 that won't idel until it warms up.

KHLOW2008

MECHANIC
41,815 POSTS

First ensure the sparks are bright blue.
Btw were the valve clearances checked?

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Wednesday, October 17th, 2012 AT 12:22 PM

STEVESANTOS

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Spark is bright blue.

I had new valve seals put in less than six months ago and the fellow who did the work said that he set them then. I will check them tomorrow. The back firing and running rich was a problem even before he changed the seals.

For a brief moment it held an idle just a few minutes ago. I warmed it up for a good three or four minutes and when released the accelerator it held for about 30 seconds but when pressed on the accelerator again it sputtered and died. I tried several more times to get it to idle but got so frustrated I had to pack it in.

At 29 lbs fuel pressure should I go ahead and order the fuel pump?

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Friday, October 19th, 2012 AT 12:12 PM

HMAC300

MECHANIC
48,601 POSTS

The pump pressure shold be 42 unregulated an d35 regulated, yes get the pump it is low and may be causeing the backfire.

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Friday, October 19th, 2012 AT 2:01 PM

KHLOW2008

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Btw did you test the fuel pressure regulator? Crimp the return hose and check if pressure increases to more than 35 psi.

At 29 psi, it definitely is low but it could also be due to leakages, especially intank where the pump is attached to housing via a hose. Ensure the hose is good.

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Saturday, October 20th, 2012 AT 11:53 AM