What causes a misfire on a Silverado Sierra?

I have had a couple weird misfire issues in the past from a cam lobe starting to go down. most recently a couple weeks ago on a 07 tahoe with a 5.3l, I went down the same road you have been going down, finally found it by taking the valve cover off and running the engine.

Why does my Vortec 5300 have a misfire?

MISFIRE MYSTERY!!! I have a misfire that cannot be diagnosed!!!! 1999 5.3 Sierra. My engine has been rebuilt because of a dead #7 cylinder at 167800 miles. We figure a weak coil caused this.

Are there any fixes for a cel engine misfire?

Car has a CEL which was Engine misfires the dealer notes said 1-3-5 cylinders and just replaced the plugs…light is back on with misfires…so searching around I found TSB# 4016 and it says engine misfires on 1-3-5…but I cant tell what the fixes are for this TSB…Can anyone look up this TSB and tell what the fix is for it?

Is the # 5 cyl engine a dead Miss?

Yes it had a complete valve job at the engine shop. It is a dead miss all the time only on # 5 Cyl.Compression on all cylinders are right at 150. Vacuum at idle is about 18 with no discernable fluctuation.

How to troubleshoot a GM Truck misfire?

This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see: P0300: Random Cylinder Misfire. P0301: Cylinder #1 Misfire. P0302: Cylinder #2 Misfire. P0303: Cylinder #3 Misfire. P0304: Cylinder #4 Misfire. P0305: Cylinder #5 Misfire. P0306: Cylinder #6 Misfire. P0307: Cylinder #7 Misfire.

MISFIRE MYSTERY!!! I have a misfire that cannot be diagnosed!!!! 1999 5.3 Sierra. My engine has been rebuilt because of a dead #7 cylinder at 167800 miles. We figure a weak coil caused this.

What’s the misfire code on a Dodge 3.9L?

P0307 Cylinder #7 Misfire. P0308 Cylinder #8 Misfire. Sometimes, even tho’ the engine is suffering a bona-fide misfire, no misfire codes are registered in the computer’s memory and/or no check engine light (CEL) on. Lack of power upon acceleration.

What was the ignition module for a 1996 GMC k1500?

1996 GMC K1500, K2500, K3500 Pick Up. All of the information you need to diagnose a misfire or a no-start problem (caused by the ignition coil, the ignition module, or the crankshaft position sensor). Wiring diagrams.

What kind of problem does a 1997 GMC pick up have?

1997 GMC K1500, K2500, K3500 Pick Up. All of the information you need to diagnose a misfire or a no-start problem (caused by the ignition coil, the ignition module, or the crankshaft position sensor). Wiring diagrams.

How to help me with a Chevy k1500 misfire?

× Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

What’s the misfire code on a 1998 Vortec?

Can someone please help with what I should check next, I have a 1998 Chevy K1500 5.7 Vortec with a misfire, P0300 code for 3 months. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire.

What causes random stalling on a Silverado Sierra?

Keep the ideas coming as random is this happens, the frequency seems to be increasing, but I still can’t identify the point of failure. zacharyh687 wrote: It could also be a IAC issue or a gummed up throttle body. Might try and clean the throttle body and iac.

What causes a Chevy Silverado engine to misfire?

This occurs when the Powertrain Control Module (PCM) in your Chevrolet Silverado truck detects a misfire on one or multiple cylinders randomly. Such misfiring can happen when there isn’t enough fuel burning in your cylinder. It’s very vital that the cylinder is burning enough fuel so that the engine can operate optimally.

What makes a GM 4.8L misfire engine stall?

P0306: Cylinder #6 Misfire. P0307: Cylinder #7 Misfire. P0308: Cylinder #8 Misfire. Really bad gas mileage. Lack of Power when you accelerate your van, pickup or SUV. Engine may start, run for a few minutes and stall.

What’s the diagnostic trouble code for a misfire?

The hard-to-diagnose misfires are usually the ones that set a P0300 Random Misfire Code or ones that don’t set a diagnostic trouble code at all. I don’t mean to give you the idea that it’s all a hopeless matter!

What causes a 5.3 liter engine to misfire?

Noise and misfire seem to be very commonplace for this 5.3-liter engine. These misfires happen as a result of various kinds of Active Fuel Management Lifter. Active fuel management which is a general feature in various engines, can provide some serious issues.

Why do I get misfire on cylinder 6?

88000 Km later, the day after an oil change, i get the same misfire on cylinder 6…. i find it interesting (read really annoyed) that this is happening on the same cylinder…. thoughts?? anyone here of this in other engines?? known problem in design?? # 6 is an AFM lifter, be my guess the lifter has a partial collapse, check the compression.