Question about 2002 Chevrolet Silverado 1500
Coming off a 250 mi trip with no problems, when at a stoplight, engine RPM becomes erratic and fluctuates between 1000 and 2500 RPM with associated stumbling on acceleration. No problem at idle, and after being driven slowly the problem goes away. at speeds up to 50 mph,, only to return on acceleration or going uphill..
Could be any number of things fuel flow , air flow get codes read to see if it could be an 0 2 sensor leading to a cat problem
Posted on Dec 02, 2017
Try checking for vaccum leaks, use carb cleaner and spray it around the base of carb, vaccum hoses, edges of intake manifold, take pliers and squeeze the big line to brake power booster & see if it changes, pull the pcv valve out and cover with your finger see if it changes idle.
Posted on Dec 28, 2008
Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!
Posted on Jul 03, 2009
Well there are quite a few things that casue a "surge" in a common rail diesel. You will need to check injector flow rates (scanner only). Fuel pressure regulator for pulsing (scanner only). Supply side fuel system for air leaks (seeing if it is sucking air into the system).
My bet would be the injectors, because you say the rpms aren't going up and down, which is usally what happens when the regulator goes bad, and when you **** air into the supply they have an extended crank. Report back with your findings.
Posted on Nov 24, 2009
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