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Random/multiple cylinder misfire

Tiny
TONYHIL
  • MEMBER
  • 2002 CHEVROLET S-10
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
New plugs, wires, button, cap and engine coil also new mass airflow sensor. Still misfires.
Monday, August 16th, 2021 AT 10:34 AM

21 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Typically on misfires the you will get a trouble code.
Is your check engine light illuminated? If so what codes are you getting?

https://youtu.be/vMwTzURWXmk
https://youtu.be/e3YCZa2Ygpo

Have you got a chance to check the ignition control module?
The ICM controls the coil and plugs. A bad ICM can produce random misfires.
The ICM can be tested, usually you can take it off and take to your local auto parts store and they will test it for you. This way if it is not faulty you just don't want to replace it.

Let me know what you got.

Thank you.
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Monday, August 16th, 2021 AT 9:03 PM
Tiny
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Does the EGR valve or throttle positioning sensor have anything to do with misfire also?
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Tuesday, August 17th, 2021 AT 4:21 PM
Tiny
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If you have a clogged EGR or a dirty TPS it can run rough, but should not trigger misfire.
Typically you will have idling issue, like rough idle or low power.
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Tuesday, August 17th, 2021 AT 7:58 PM
Tiny
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I also hear a knocking noise like it could be a lifter.
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Sunday, August 29th, 2021 AT 1:13 PM
Tiny
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Lifter noise can be heard either for being low on oil or an issue with the lifter.
Sometimes engine misfire can create knocking noise. Did you get a chance to scan for codes?
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Sunday, August 29th, 2021 AT 3:30 PM
Tiny
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Code says random/multiple cylinder misfire.
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Sunday, August 29th, 2021 AT 4:09 PM
Tiny
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The random misfire can be triggered by ignition control module. If you have not already might want to get that checked. That module is right next to the coil.
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Monday, August 30th, 2021 AT 9:24 AM
Tiny
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I haven't checked it yet. But I would like to know if the spyder injectors might cause the misfire?
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Monday, August 30th, 2021 AT 11:05 AM
Tiny
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Well, the spyder injector can cause the misfire. Used to see those injectors getting changed all the time under warranty due to all sorts of issue.
But typically the replacement ones held up better.
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Monday, August 30th, 2021 AT 1:45 PM
Tiny
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Changed ICM still misfires and knocks not saying bad coil but coil is new.
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Friday, September 10th, 2021 AT 9:35 AM
Tiny
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You know the other item could be the distributor itself. Do a thorough inspection of the distributor. See the guide below, it does over the inspection process.
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Friday, September 10th, 2021 AT 2:19 PM
Tiny
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If it's not the distributor, do you suggest changing the spyder?
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Saturday, September 11th, 2021 AT 6:15 PM
Tiny
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Well,
if you have checked all ignition components like plugs, wires, cap/rot, distributor etc.
Then the spider injector really is the next item. But keep in mind many times those random misfires are due to an issue with the ECM.
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Saturday, September 11th, 2021 AT 10:09 PM
Tiny
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I've changed wires, plugs, cap, rotor bitton, coil, icm, mass airflow The only thing left is the distributor and spyder.
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Sunday, September 12th, 2021 AT 7:16 AM
Tiny
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I have seen many of these spyder injectors cause misfire and many other drivability issue back when they first came out. The replacement ones typically fixed the issues with the initial components. If the distributor is good and adjusted properly then fuel is likely the issue.
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Sunday, September 12th, 2021 AT 10:06 AM
Tiny
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I changed the battery and it helped some, but now it's saying cylinder 2 misfire and a bad coil. But I put a new coil on when I changed the rotor and cap.
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Saturday, September 25th, 2021 AT 5:06 PM
Tiny
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Can you tell me what all the new components you have installed on this truck?
Just like to get a complete picture, it can help with figuring out what might be issue. Thanks.
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Saturday, September 25th, 2021 AT 9:31 PM
Tiny
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I put new wires, plugs, distributor cap, rotor, coil and ignition control module.
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Sunday, September 26th, 2021 AT 4:36 AM
Tiny
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Have you made sure that the distributor does not have any play in it. Loose distributor can give random misfire codes. Other than that it can be the spyder injectors or ECM.
Does it misfire all the time, or it will run good for a while then misfire?
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Sunday, September 26th, 2021 AT 9:21 AM
Tiny
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Misfire the whole time it's running.
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Sunday, September 26th, 2021 AT 12:20 PM

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