1996 Pontiac Grand Am se 3.1 High Idle
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1996 Pontiac Grand Am se 3.1 High Idle
My engine idles high changed throttle position sensor.What can it be. Idle goes back down after I turn it off & start it up.
Re: 1996 Pontiac Grand Am se 3.1 High Idle
It could possibly be the Idle Air Control valve which is right next the the Throttle Position Sensor you already replaced. You might want to try to remove it and check to see if it's suck or has an excessive amount of carbon build-up on it. If you have access to a scanner, you can command the IAC to see if it functions correctly.
Also, you might want to check to see if there are any trouble codes stored in the computer. Another thing can be the actual throttle blade sticking due to excessive carbon build-up. A thorough cleaning with some carb spray or other similar cleaner can do wonders for a heavily carbon-clogged throttle body.
Other things that are a possibility....a vacuum leak, and stuck open EGR valve, a computer or other sensor problem (this is where a scanner comes in handy), or even the possibility of the new part you installed being faulty.
Also, you might want to check to see if there are any trouble codes stored in the computer. Another thing can be the actual throttle blade sticking due to excessive carbon build-up. A thorough cleaning with some carb spray or other similar cleaner can do wonders for a heavily carbon-clogged throttle body.
Other things that are a possibility....a vacuum leak, and stuck open EGR valve, a computer or other sensor problem (this is where a scanner comes in handy), or even the possibility of the new part you installed being faulty.
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GM Dealer Technician For 18+ Years
In the automotive industry for 20+
In the automotive industry for 20+
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Re: 1996 Pontiac Grand Am se 3.1 High Idle
I changed air idle control does the same.I changed egr valve but it check engine light pop on.I put the old one on.The scanner says egr inc.Any ideals?It still idles high.
Re: 1996 Pontiac Grand Am se 3.1 High Idle
Can you post the actual codes that the computer is showing?
GM Dealer Technician For 18+ Years
In the automotive industry for 20+
In the automotive industry for 20+
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Re: 1996 Pontiac Grand Am se 3.1 High Idle
no it justs says egr/vvt sys mon inc.no codes
Re: 1996 Pontiac Grand Am se 3.1 High Idle
What are you using to get that information? There has to be codes stored if there is a problem.
Try a better scanner, otherwise I can't help you.
Try a better scanner, otherwise I can't help you.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+
In the automotive industry for 20+
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- Posts: 9
- Joined: Sun Nov 11, 2012 8:15 pm
Re: 1996 Pontiac Grand Am se 3.1 High Idle
i have a actron cp9580.but i'm still learning how to use it. The code is P1406.can it be the pigtail? because with a new egr valve same code.
Re: 1996 Pontiac Grand Am se 3.1 High Idle
That still doesn't help here, I need the actual codes.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+
In the automotive industry for 20+
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Re: 1996 Pontiac Grand Am se 3.1 High Idle
the code is P1406.but a new egr valve does the same. can it be the pigtail &can i check that?ProTech wrote:That still doesn't help here, I need the actual codes.
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