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05-07-2011, 07:58 PM #1
92 Suburban idles up and down then dies.
I have a 1992 'Burban k1500 4x4 that we ahve replaced every conceivable sensor,valve and pluig. Distributor has been changed, wires, plugs...the whole works. The truck just won't run right. We have adjusted the timing, changed the fuel filter but nothing has worked. It won't hold pressure after 1500 rpms. it goes up and down almost to the pint of stalling. If you put your foot on the brake it evens out. Don't know where to go from here and I don't want to scrap the Wife's baby. any one have any ideas?
05-08-2011, 07:56 AM #2
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- Feb 2008
- Cloquet, Minnesota, United States
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have you run a fuel pressure test?? on the 92s you should have 13PSI min. Also have you checked for any vacum leaks?Mike
1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).
2009 Saturn Aura XE (wifes car)
2011 F-150 Crew 4X4
"Hold it to the floor till you see God.... Then Brake!!!!"
05-08-2011, 07:26 PM #3
Have you checked/cleaned the IAC valve. This helps to control idle. If its dirty/cummed up it can't move in and out.
05-08-2011, 08:17 PM #4
that is the next after the brake booster. When it is hooked up and the brake is applied it evens out the idle. So I disconnected the vacuum line from the booster and it runs fine. It won't hold idle though, I believe it is to low with the vac line off and when it kicks down it drops too low to stay running.
---------- Post added at 07:17 PM ---------- Previous post was at 07:13 PM ----------
We replaced the IAC today as well as cleaned the EGR valve
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