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I have a 99 Chevy silverado the problem is the check engine light keeps coming on saying # 4 cylinder miss fire have had it checked has compress and is firing Engine will lose power and is sluggish especially over 30mph Any ideas

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My 1999 silverado has a 4.3 vortec engine an keeps burning up distributor caps an rotor buttons it has a miss in it when your driving it and your re barely pressing the accelerator the code says it has...

A lot of miles could mean a worn cam lobe..I recommend a compression check..make sure you are using OEM spark plugs for sure..and the correct battery..Some parts stores have weak parts also that has happened to me before and it drove me crazy..also racing spark plugs or wrong plugs will cause incorrect fire and it will force the engine to miss but will still run.I really need to know how many miles are on the engine and if it has correct plugs or not...Metalpoet

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Check engine light is on, they say multiple miss fire in cylcinder 6. but no one can find the problem van runs great

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My 5.3 02 silverado has low compression and is miss firing

Any engine that has low compression indicates worn internal parts. $$$$ The usual suspects are worn piston rings. Have you checked all 8 cylinders? If so, are they all losing compression, or just certain cylinders? If you have access to a garage, do a compression check on all 8, you may also want to get a cylinder leakdown test, again, on all 8 cylinders. You can then decide what course of action would be best. Good Luch!

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1997 Chevy Silverado 1500 4x4 will not start. Getting spark checked all fuses, changed rotar - spark plug wires,

Have you checked the fuel pressure? Fuel pumps are a common failure item on those trucks. Pick up a cheap fuel pressure gauge and hook it up to the shrader valve on the fuel rail. With the ignition on and you should have 55-65psi. Even if it's a few psi below spec it could stop the engine from firing.Once you determine the fuel pressure isn't adequate make sure you have a good power and ground at the fuel pump. If that checks out, time for a new fuel pump module. I recommend only replacing it with an AC delco unit, I've heard bad stories about aftermarket replacements.
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1 Answer

Engine misfiring cylinder #3

Hi there;
I have run into an issue with these engines miss-fireing on #3 before.
You may want to have you tech check the miss-fire count for #3 & #7 on his/her scanner, THe distributor cap on these engines is made so the spark for #3 crosses over the path of #7 & they sometimes mix & become one. What happens then is they may be fooled by a spark coming through the wire if on a test lead but won't send the spark to the cylinder. The spark always goes to the easieat place so when cyl.#3 is ready to fire it is easier for the spark to go to #7 & vice-versa, So you tech will see a constant miss-fire on #3 & an intermitant missfire on #7. they can ceck the cap by pulling #3 plug wire off the distributor cap while the truck is running & there will be no spark, if he puts #3 back on & pulls #7 off there will be no spark there. the computor will only set a #3 miss-fire code because that is the cylinder that miss-fires the most.
If they find that is O/K you will want to have them do a compression test. If they find the compression is conciderably lower on cylinder #3 than the rest the camshaft theory is plausable.
The next step will cost you some money but it will tell you if you have an injector issue. You will have to pay you tech about 3.0 hrs to do this & you can just have them replace the #3 injector & hope it works. But they are around $200.00 rebulit so thats alot of money to throw at a hope. You'll need to get them to swap the #3 injector with the injector from one of the other cylinders then run the engine. if the miss-fire moves to the other cylinder you know you have an injector issue.

I hope this helps, Good luck, please let me know how you make out.

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99 Chevy 4.3 2 cylinders don't fire (all cylinders have spark)

Sounds like your computer is fried. Check prices at your local recycling yard or EBAY. Ive seen this happen on other makes and models as well, and its always been the computer...

hope this helps!

Feb 26, 2009 | 1999 Chevrolet Silverado 1500

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