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High Idle by okie84
Started on: 04-18-2015 10:15 AM
Replies: 7 (200 views)
Last post by: coltonandrew on 04-19-2015 12:00 PM
okie84
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Report this Post04-18-2015 10:15 AM Click Here to See the Profile for okie84Click Here to Email okie84Send a Private Message to okie84Edit/Delete MessageReply w/QuoteDirect Link to This Post
Having an issue with excessive high idle on start, does not decrease no matter how long it runs. Also check engine displays when starting but goes off shortly after starting. Any suggestions? Any help is greatly appreciated.

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fierotrev2014
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Report this Post04-18-2015 10:24 AM Click Here to See the Profile for fierotrev2014Send a Private Message to fierotrev2014Edit/Delete MessageReply w/QuoteDirect Link to This Post
How high is it idling? Little more info about the fiero? Vacuum leaks are common to cause a high idle. If its a 2.8, cracked egr tube is a possibility for a significant vacuum leak.
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Gall757
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Report this Post04-18-2015 11:22 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Check for the code. It is stored in the computer memory and will help you diagnose the problem. It is nearly always a vacuum leak.

http://www.fiero.nl/cgi-bin/main.cgi?ECMCodes
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coltonandrew
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Report this Post04-18-2015 11:28 AM Click Here to See the Profile for coltonandrewClick Here to Email coltonandrewSend a Private Message to coltonandrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Go out, start it, and tap the gas pedal. Does the rpm die down to a good range? If so, it's normal. Its just your car trying to warm up. You can over ride it by touching the gas pedal.
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Gall757
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Report this Post04-18-2015 11:41 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by coltonandrew:

You can over ride it by touching the gas pedal.


If that is true....you have a sticky throttle cable or gas pedal.
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katatak
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Report this Post04-18-2015 11:31 PM Click Here to See the Profile for katatakSend a Private Message to katatakEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by coltonandrew:

Go out, start it, and tap the gas pedal. Does the rpm die down to a good range? If so, it's normal. Its just your car trying to warm up. You can over ride it by touching the gas pedal.


Really?????

Vacuum Leak - If it's a 2.8, take the air cleaner tube off. Look in the bottom of the TB. You will see a hole about 10MM. Start the car and then put your finger over the hole. Does it idle down but keeps running? If so - you have a big vac leak - as mentioned above - EGR Tube, Cracked plastic vac line, etc......
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coltonandrew
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Report this Post04-19-2015 11:54 AM Click Here to See the Profile for coltonandrewClick Here to Email coltonandrewSend a Private Message to coltonandrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Throttle body injection guys come on! The choke remains open to get the vehicle to operating temp haha you release the butterfly valve by tapping the gas pedal.

Just try it. I'm not saying its right but check the simple things first. Then check your vac lines. Get in there with starter ether or brake clean and spray around if you see no visible cracked/ corroded/ split hoses.
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coltonandrew
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Report this Post04-19-2015 12:00 PM Click Here to See the Profile for coltonandrewClick Here to Email coltonandrewSend a Private Message to coltonandrewEdit/Delete MessageReply w/QuoteDirect Link to This Post
Iwould also like to note he said on start, not constantly. But he was vague so we all have a plethora of options to throw at him. We dont ever know if he's on a carb, tbi or fi set up, we dont know if he's ever done the vac lines, we don't know if its the 2.5 or 2.8, manual or auto so theres a lot to consider in this post. He may even have swapped the engine.
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