1996 Pontiac Grand Am se 3.1 High Idle

babycritter
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Joined: Sun Nov 11, 2012 8:15 pm

1996 Pontiac Grand Am se 3.1 High Idle

Unread post by babycritter »

My engine idles high changed throttle position sensor.What can it be. Idle goes back down after I turn it off & start it up.

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ProTech
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by ProTech »

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.
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GM Dealer Technician For 18+ Years
In the automotive industry for 20+

babycritter
Posts: 9
Joined: Sun Nov 11, 2012 8:15 pm

Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by babycritter »

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.

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ProTech
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by ProTech »

Can you post the actual codes that the computer is showing?
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babycritter
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by babycritter »

no it justs says egr/vvt sys mon inc.no codes

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ProTech
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by ProTech »

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.
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babycritter
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by babycritter »

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.

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ProTech
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by ProTech »

That still doesn't help here, I need the actual codes.
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babycritter
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Re: 1996 Pontiac Grand Am se 3.1 High Idle

Unread post by babycritter »

ProTech wrote:That still doesn't help here, I need the actual codes.
the code is P1406.but a new egr valve does the same. can it be the pigtail &can i check that?

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