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  I have a high idle on 87 2.8 gt. All stock please help...

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I have a high idle on 87 2.8 gt. All stock please help... by FieroGT-987
Started on: 01-30-2014 05:05 PM
Replies: 7 (215 views)
Last post by: FieroGT-987 on 01-30-2014 10:30 PM
FieroGT-987
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Report this Post01-30-2014 05:05 PM Click Here to See the Profile for FieroGT-987Click Here to Email FieroGT-987Send a Private Message to FieroGT-987Edit/Delete MessageReply w/QuoteDirect Link to This Post
All stock. Has high idle. Around 2000 at cold start and 1700 warm, it is very high. I suppose I have a vaccum leak somewhere. The EGR is blocked off. It is leaking a little bit under the egr. Mahbe the gasket is worn. Could this be the cause? I have read other threads and tried a few things but cant come up with anything. Thanks
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dobey
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Report this Post01-30-2014 05:09 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Sounds like a vacuum leak to me. Have you used any vapor to see where it's being sucked into the intake at? EGR, MAP, and cruise control lines are all common places for leaks to occur. The rubber lines drying out and cracking is not uncommon on the 25+ year old cars.
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FieroGT-987
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Report this Post01-30-2014 05:13 PM Click Here to See the Profile for FieroGT-987Click Here to Email FieroGT-987Send a Private Message to FieroGT-987Edit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the response. I did on a few lines but I guess I am just unsure as to where exactly I am to spray. Could this possibly be because of a leaking egr? Or the gasket. I can feel a tiny bit of air
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Gall757
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Report this Post01-30-2014 06:31 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Did you remove the EGR tube? How did you block it off under the upper intake?
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FieroGT-987
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Report this Post01-30-2014 06:37 PM Click Here to See the Profile for FieroGT-987Click Here to Email FieroGT-987Send a Private Message to FieroGT-987Edit/Delete MessageReply w/QuoteDirect Link to This Post
Previous owner blocked it off with sheet of metal
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Ray_and_kevin
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Report this Post01-30-2014 10:24 PM Click Here to See the Profile for Ray_and_kevinSend a Private Message to Ray_and_kevinEdit/Delete MessageReply w/QuoteDirect Link to This Post
Did the previews owner also use a gasket between the metal plate and the manifold? Lack of a gasket would let air sneak by. I just changed the EGR tube on the 88 and I swear I could not see a leak, but it sure did fix the problem. It takes only a really small leak to mess up the idle.
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pontiackid86
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Report this Post01-30-2014 10:28 PM Click Here to See the Profile for pontiackid86Click Here to Email pontiackid86Send a Private Message to pontiackid86Edit/Delete MessageReply w/QuoteDirect Link to This Post
EGR WILL cause this... Mine did it in an 86 with an automatic transmission sending me on a Nice little fly down the highway....

[This message has been edited by pontiackid86 (edited 01-30-2014).]

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FieroGT-987
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Report this Post01-30-2014 10:30 PM Click Here to See the Profile for FieroGT-987Click Here to Email FieroGT-987Send a Private Message to FieroGT-987Edit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks a lot. I guess i could get gaskets at auto parts store for this?
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