Idling issue

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Mar 12, 2018 | 12:56 PM

rwomer

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Starting Member

Joined: Mar 2018

Posts: 1

From: Arizona

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; Mar 12, 2018 at 12:58 PM. Reason: Add info

Mar 12, 2018 | 02:53 PM

jacked_72

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Joined: Nov 2017

Posts: 98

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.

Mar 12, 2018 | 03:18 PM

Mike.308

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Joined: Nov 2017

Posts: 746

From: Poland

What are Your fuel trims?

Mar 17, 2018 | 09:41 AM

jimspahr@msn.com

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From: South Carolina midlands

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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.