Question about Chevrolet 1500
2001 Silverado. Problems started with codes results showing, misfiring on #2 & #7. Since them, I have: Replaced the intake gasket and torque. New plugs, wires, coils on 2 & 7, PVC, Fuel reg, TPS, fuel injector on 7, Fuel filter, Compression test is 180 - 155, Fuel pressure is 52, very poor fuel economy, idles @ 600 while in park. When we disconnect the connector to the TPS, and re-plug it, the idle goes to 1,100 while in park and sounds great. Later on it returns to its previous condition. Thanks for any help.
Hate to say it but I would look at the valves on those cylinders. I would venture they are not sealing properly.
Posted on Mar 20, 2014
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Posted on Jan 02, 2017
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Posted on Dec 10, 2008
Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.
Posted on Aug 18, 2009
Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.
Posted on Sep 03, 2009
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