2000 Silverado LT, automatic, that just had the rear end replaced and
a new battery installed. Whether warm or cold once I get moving it
appears like the idle is high. If I come to a stop sign you can hear
the engine higher then normal and slight pressure on the brakes to
keep going. Sometimes when I release the brakes I hear a clunk as if
they were pressured and the truck moves on. When accelerating from a
stop I can reach 2000 RPM or so and it will almost hang there for a
second or two then change gears, same at next gear. That is the only
way I can describe it but i'm looking for advice before I go back to
garage to discuss it with them. Not sure if its noteworthy but when
changing the battery they somehow put a surge through the truck as
they blew the fuses and a resistor in the autostart module, and blew
the fuses in my pioneer stereo.
On Thu, 10 Sep 2009 05:33:20 -0700, Sibernewf fired up the etcha-a-sketch
and scratched out:
Just a guess, but did the idle issue occur before the battery? If not,
you may have blown out your computer as well. That could cause
inconsistent O2 readings, which would force the system to run rich or
lean or both depending on the moment.
If it is running rich, you might look into the injectors or cat.
You could also check for a clogged EGR valve.
What do you have - the 4.3L V6, 4.8 or the 5.3 V8 model or the 2500 with
First thing I would suggest is to disconnect the battery. let it set for
20-30 minutes and reconnect. I have seen more than one vehicle seem to
lose the initial settings from a power spike.
Next would be to make SURE ALL the fuses are OK.
Then check for a loose vacuum line on the rear of the engine.
Then throw a scan tool on it and see what it is seeing from the ECM.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.