Idling issue

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03-12-2018, 12:56 PM

rwomer

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Join Date: Mar 2018

Location: Arizona

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Idling issue

2004 Blazer rwd 4.3 idle goes up and down. Map sensor or clogged air filter or possibly fuel pressure. Also there is a 1/4 inch vacuum line going nowhere

Last edited by rwomer; 03-12-2018 at 12:58 PM. Reason: Add info

03-12-2018, 02:53 PM

jacked_72

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I'd start with the vacuum line. Not much you can troubleshoot while a vacuum line is unplugged. Air filter is pretty easy to check, so that would be second.

03-12-2018, 03:18 PM

Mike.308

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What are Your fuel trims?

03-17-2018, 09:41 AM

jimspahr@msn.com

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Check the IAC device. Clean the Throttle plate with 3M intake manifold cleaner, not carb. cleaner. Vacuum lines are important as someone has recommended.