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Thanks for your help. We got the high idle to stop ether by working the PCV valve hose or by putting our old throttle position senor back on. However, we still have a misfire, and we get codes P305 an

Thanks for your help. We got the high idle to stop ether by working the PCV valve hose or by putting our old throttle position senor back on. However, we still have a misfire, and we get codes P305 and P316 again now that code 122 has stoped.

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  • Cars & Trucks Master
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Well code 316 means the computer has detected a miss during startup, and code 305 means cylinder number 5 is not producing power. That could be a lack of fuel, spark, or compression.
At least you know to check cylinder 5 for the problem.

Posted on Dec 02, 2014

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Hi you have replaced allmost everything ,(try fuel pump relay)

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SOURCE: 2006 pt cruiser idles high with no pcv valve hose connected

Replace the PVC valve, it's probably clogged.

Posted on Nov 21, 2008

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SOURCE: Check engine light is on and high idle (1500rpm)

Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.

Please contact me if your problem presists.
Thanks, Charlie

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SOURCE: Saturn SL 2002 High Idle

Intake manifold gasket. Leaking where intake meets head.

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Good Day, my Corsa is got a high Idling and replaced all sensors on intake and throttle. Still Idling high and workshop light came on. What can the problem be. Please assist me - Thank you.


The cause of high idle are vacuum leaks or a bad or dirty Idle air control. Check pcv valve to see if its working properly. pinch off the hose that supplies the PCV valve. The engine speed should drop slightly. If the engine returns to a normal idle speed, the PCV valve should be replaced. The Idle air control regulates engine rpms.

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If you didn't correctly reinstall the PCV hose from the black box at the throttle body back on to the valve cover, you might have a vacuum leak causing your high idle. I'd check that first. That is a common mistake to miss that rubber hose. It's hidden underneath the black box at the front of the valve cover. If it is loose, just loosen up the boot at the throttle body, and the two bolts on the right side of the black box above the valve cover. Reposition the 90 rubber hose back on to the valve cover and recheck it. A hissing noise with the engine running is a good indication that the engine has a vacuum leak somewhere- usually a rubber hose disconnected from the intake manifold or throttle body.

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