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Poof sound at idle small miss.

This is a discussion on Poof sound at idle small miss. within the External Engine forums, part of the LSx Technical Help Section category; Well My car lately at idle has been making a Poof noise kinda like a little miss. only at idle ...

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    Member krug07's Avatar
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    Poof sound at idle small miss.

    Well My car lately at idle has been making a Poof noise kinda like a little miss. only at idle at random times. i went up to the local shop i know the owner we hooked up is diagnostic tool to see how the car is running first time around while the car was running with it hooked up everything looked good. Then we ran it again.. it showed a little miss on cylinder 1. and 4 i believe. car doesnt show check engine light so it isnt bad. i just put in some autolite ar-94 plugs in and also so new msd wires i run a nx wet kit. He said check the plugs make sure they look good if they look fine then maybe its just because you are running 2 degrees colder.. This only happens at idle. You have to listen to hear the little poof sound coming out of the exhaust..could running colder spark plugs somewhat do this?? I have only been sparying 75shot. a 100shot twice.. He said he thinks i might have a exhaust leak. that could play a part of the noise?? But when it shows a little bit of a misfire what can that be.. again car drives completly fine.. Just noticed the noise at idle and while hooked up to diagnostic tool it showed it was fine then at times showed a little miss... advise please everyone!!!!

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Does the idle fluctuate?

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    Member krug07's Avatar
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    what do u mean exactly?

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    Member krug07's Avatar
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    anyone?

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    Mine did it before I did the cam swap. The cylinders with the random misfires could have lower cylinder pressures causing intermittent low speed misfires. I know that my cylinders are all over the place ,but my motor has 128,xxx miles. I wouldn't be too worried about intermittent low speed misfires, when they are all the time misfires, then get worried.

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    Quote Originally Posted by krug07 View Post
    what do u mean exactly?
    At idle, do the rpm's go up and down?

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    Member jamessr's Avatar
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    Well this may sound stupid and I apologize if it come across that way....
    However have you physically checked the gap on your plugs? Especially plugs 1 and 4? I had a very bad experience with a mechanic that changed my plugs because I was too lazy to do it myself. At idle and at idle only the car would have a very slight pop in the exhuast every few seconds. If I loaded the engine down like running the A/C on high it went away. The guy claims Platinum plugs shouldn't ever need to be gapped but when I brought my car to the dealership, Pontiac stated its NEVER a bad idea to check the gapping. As it turned out plugs 2 and 7 weren't gapped proper. For your sake I hope its something simple as that.

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    Member krug07's Avatar
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    No at idle it doesnt go up and down.. it can be running fine for awhile then a little miss only at idle. my buddy thinks it is when the car is sitting that it loads up on fuel because the colder spark plugs and makes the poof noise/random miss and when im driving around it isnt loading up so no problems then. Yes they are all gapped at .038 checked the ones that said they had a little bit of a misfire and the plugs look good.

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    Member krug07's Avatar
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    any ideas guys?

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    Member krug07's Avatar
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    i know someone has a idea what this might be.

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    Member krug07's Avatar
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    come on guys

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    Member jamessr's Avatar
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    Well other than saying its fuel or spark issue I don't what else to say. Bring it to the dealership. Still sounds like a spark issue to me. I'd say change the plug and put the platinum plugs back in. If the sound goes away then yes its the 2 degree difference causing the issue.

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