Question about 1997 Mazda 626

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Cylinder not firing

Cylinder #4 not firing causing miss. New wires, plugs and fuel injector. Verified that all are working. What's next? valve problem?

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  • Ernesto May 11, 2010

    Did you check the distributor cap. do you have good spark on number 4

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Have you verified that you are getting spark at the plug when the engine turns over? To do this you can remove the spark plug and insert it into the end of the plug wire. Set the electrode against something metal on the engine. Crank the engine and watch for spark. If you get spark, then you can start thinking about timing, cylinder, fuel problems. If you don't get spark, think about distributor cap/rotor or wire problem.

Posted on Oct 04, 2009

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Next step would be to check the compression in that cylinder and compare it to the others.

Posted on Oct 04, 2009

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1998 gmc jimmy 6cylinder 4.3 4x4 no fuel and


If you changed your plugs, etc. and know that you are getting a good spark then it's really only 2 other things to check. The compression in that cylinder and the fuel. Check fuel pressure with gauge hooked up to Schrader valve on fuel line next to your distributor ( it has a black threaded cap on it). If pressure is good then you have either a dirty or clogged fuel injector or the injector quit working. Let me know what you find. Anytime you get a misfire in a particular cylinder, you should always check for spark, fuel and compression.

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# cylinder 3 misfire


you don`t say how you verified that the plug and wire was good. I think these use coil on plug, if so check powers and grounds for that coil as one may have a problem.other things that could cause this is a bad fuel injector, poor compression due to either rings, valve, worn cam, damaged push rod,

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What do I do next? My 2001 olds alero 3.4l v6 is misfiring constantly. Scanned obd2 error code p0301. Already changed spark plug, wire, and coil for cylinders 1 and 4. Still have same problem.


I recommend checking all injectors and O rings on the injectors if an O ring cracks air can raise Cain with misses so can injectors another thing is cam to look at will cause a constant miss but only on 1 cylinder at a time but doubt its the cam. check injectors and O rings also pull 1 plug wire at a time with wire pliers while engine is running and find the 1 cylinder that is giving you the problem when you pull the plug wire that is missing the engine will smooth out then that cylinder is your problem wear rubber gloves with the plug wire pliers so you dont get bit let me know if i can help please rate my solution as this is how i earn my achievements on fixYa thanks.

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Car idles rough, sometimes dies in reverse, it's worse in cold.


A cylinder that doesn't fire could be 1 of 3 things: no spark, no gas, or no compression.
Sure, it could be a bad injector, or clogged, but you should do some tests before buying an expensive new injector. You should first check the injector circuit on #2 cylinder. It's a pretty simple circuit, really. Each injector has 2 wires, a power wire and a ground wire. The power wire is one wire, which is spliced to each injector, and has battery voltage on it anytime the ignition switch is on or in "run". Each injector's ground wire is a separate wire going into the computer. When the computer internally grounds for a split second that injector's circuit, the injector sprays fuel out a tiny opening, a nozzle. You can check the circuit for #2, both the power wire and the ground side of the circuit with a test light. Post back and ask, if you want me to explain.
You also might want to check the compression in #2, just to assure you there is no mechanical problem causing a loss of compression in that cylinder.

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compression.

What is the problem? #5 is missing? Do you have spark for #5...Injectors don't fire. Never did never will Injectors "inject" fuel to the cylinders.

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Cdc 5.7vortex fuel injection 96 tahoe when u start it service eng light comes on after about ten seconds itstarts flashing its got a pretty good miss to it hook the box to the plug under dash it said num 4...


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The reason I'm checking the timing belt is that there is mis-fire in 1 & 2 cylinder. If the firing order is 1,2,3,4. I have continues fire out of 1 & 2, when plug wires are pulled out of head. 3...


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If one cylinder is missing at idle, it would be useful to know which one. Pulling the plug wires one at a time with insulated pliers would tell us if one does not cause a change.
It could be a fouled plug.
You could switch plugs with another, to verify.

If not spark, could be fuel.
If throttle body, then not likely.
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If none of above, then consider intake leak, collapsed lifter, valve adj, etc.

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