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My truck idles funny when it's cold

Old 09-25-2008, 03:45 AM
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My truck idles funny when it's cold

It lopes. It's like it's not running on all four. Then as soon as I start driving it, it smooths out and runs fine the rest of the time. Any ideas of what might be the cause?
Old 09-25-2008, 04:48 AM
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Have you done a compression test?

Is the cold start injector working?

Checked spark plugs?

How are the plug wires?

Distributor look OK? Any obvious issues?
Old 09-25-2008, 05:34 AM
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Mine was doing that two years ago, it was a crack in the rubber intake boot.
Old 09-25-2008, 06:35 AM
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Compression should be good because it runs like a bat very soon after startup.

I don't know about the cold start injector.

Plugs are about 3 weeks old.

Wires are pretty old, but it seems like if they were a problem that it would persist, not just right after cold start.

I bet it is an air leak. Now that you mention it I've had that problem more than once and it's very similar. I just don't understand why it would run fine after a minute or two or even immediately if I just start driving. I'll check it out.

I did the battery airbox location swap not long ago and the air conditioning hoses interfere with the intake hose location making it hard to get it to seal.
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