low idle and misfiring - Team Camaro Tech
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post #1 of 4 (permalink) Old Jun 27th, 13, 12:42 PM Thread Starter
Rob
 
Join Date: Jun 2013
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Question low idle and misfiring

I have a 1995 Camaro with a 3.4L in it, it sat up for about 3 years, replaced timing chain and harmonic balancer about a year ago, I think I replaced one of the packs on my coil pack, checked plugs and wires though, everything is firing and at higher RPMs the problem stops, usually after 1500. It sounds like a cylinder is missing or something, but I'm not sure what's causing it anymore. Checked vacuum lines as well, everything is connected and has vacuum.

http://youtu.be/dgLOkF5os1Q
This is how it sounds and behaves when the problem occurs, it doesn't seem to be an airflow problem, and it gets plenty of gas. RPMs are below 1000 when this happens, almost ready to die and it will if I let it. later at around 42 seconds, I put it into reverse and let it roll back in idle, then come back up.

This one is of how it normally sounds and behaves. I turned it off for a minute and restarted it, and it idles perfectly at 1k, no choking or sputtering or backfiring.

I've spent the last 3 days now trying to fix this **** wagon, I would be so grateful if anybody can offer some insight to what my problem is.
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post #2 of 4 (permalink) Old Jun 27th, 13, 01:46 PM
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Re: low idle and misfiring

Only 21 seconds is on line.

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post #3 of 4 (permalink) Old Jun 27th, 13, 01:59 PM Thread Starter
Rob
 
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Re: low idle and misfiring

This is the video of the problem, http://youtu.be/dgLOkF5os1Q

It's at the top in the post, it just didn't embed for whatever reason.
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post #4 of 4 (permalink) Old Jun 27th, 13, 07:09 PM
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Re: low idle and misfiring

Vacuum gauge should be steady, but with a missing cylinder, whether it be a gas problem or ign, the gauge will fluctuate.

When missing and engine is cold, you could use a temp gun and measure each exhaust port. The cold one is the missing cylinder.

If engine is hot, and misses, pull a plug and the wet plug is the dead cylinder. Dirty injector, bad coil, or temp sensor faulty causing the engine to run in 'choke' mode, enriched fuel mixture. This condition will clean up at higher rpms.

Also, with an engine sitting for a good length of time, a lifter could be stuck, but then you would hear a light tap, as in a rocker arm clanking. Low oil pressure or dirty lifter, change oil & filter.

I'm sure the timing marks on the timing chain and sprockets were in correct alignment when you installed them.

As time goes on with engine running, the PCM should relearn engine characteristics and make adjustments as it is driven.

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