Question about Chevrolet Cars & Trucks
You could have a burnt valve on the cylinder that's misfiring ! Do a compression test ! could have bad fuel injector ! What type of fuel injection does yours have TBI - throttle body injection , MFI - multiport fuel injection . Pull plug wires one at a time to see what cylinder is not contributing !
Posted on Apr 26, 2015
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Posted on Jan 02, 2017
SOURCE: 1997 chevy truck running rough
Is this a 5.7? They are notorious for intake manifold gasket leaks. When mine did it, the diagnostics blamed it on an ignition misfire also! Replaced the gaskets and it runs smooth!
Posted on Apr 01, 2009
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
Posted on Mar 05, 2010
I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.
Posted on Oct 22, 2010
SOURCE: My 1994 Chevy Silverado 5.7
This misfire could be an intake valve or exhaust valve stuck open. Remove spark plug, and use a fiber optic camera to look in the chambers to look at the valves. It could be a bent valve or badly worn edge of a valve or simply a build up of carbon debris. I own a 95 Jimmy with a V6 Vortec and it has the same problem with a miss. mine is a bad valve, I hope yours is something small, but I hope it helps anyhow.
Posted on Jan 06, 2011
I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?
Posted on Oct 12, 2011
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