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Old 08-17-2004, 11:38 AM   #1
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Default Does a defective EGR valve affect the idling of a car?

My 98 Prelude timing belt tensioner broke loose while driving on interstate highway. My car was disabled so I had it towed and had the timing belt and all the parts replaced. Everything works fine except it dies at idle.So the idle was raised at twice the recommended idle speed at 1500 rpm. What do you think is the problem?
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Old 08-17-2004, 11:45 AM   #2
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Default Re: Does a defective EGR valve affect the idling of a car? (borristebel)

yes it does affect idling... I had the problem that my car would idle incredibly low so i blocked off the EGR... havent had the problem since.. good luck
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Old 08-17-2004, 11:52 AM   #3
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Default Re: Does a defective EGR valve affect the idling of a car? (delguiner)

if you block the egr it adds hp doesn't it?
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Old 08-17-2004, 11:54 AM   #4
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Default Re: Does a defective EGR valve affect the idling of a car? (delguiner)

if you block off a working egr valve does it affect you performance ? my buddy says yes that you lose hp ,but i say no that you gain slight hp 1-5. cause all it does is allow co2 to go back into the engine.
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Old 08-17-2004, 12:02 PM   #5
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Default Re: Does a defective EGR valve affect the idling of a car? (92blackprelude)

if the EGR gets stuck open thats whats causing your bad idling and yes is does create a little hp... nothing very noticeable!
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Old 08-17-2004, 02:15 PM   #6
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Default Re: Does a defective EGR valve affect the idling of a car? (delguiner)

Only if it is stuck. Otherwise, EGR usually operates at idle and cruise. Not really a power adder I thought.
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Old 08-17-2004, 02:31 PM   #7
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my engein is throwing a code 12, egr valve, and it idles fine
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Old 08-17-2004, 04:08 PM   #8
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Default Re: (SPN BB2)

thats probably cause your EGR broke while it was in the closed position!
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Old 08-17-2004, 08:14 PM   #9
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Default Re: (delguiner)

did you ever think it may have jumped timing and bent a valve?
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Old 08-18-2004, 06:56 AM   #10
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Default Re: (sleepy_vtec)

now my idling is going good right after i blocked the EGR
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Old 08-18-2004, 07:01 AM   #11
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Default Re: (SPN BB2)

Quote:
Originally Posted by SPN BB2
my engein is throwing a code 12, egr valve, and it idles fine
Code 12 is the lift circuit code. It means your egr valve isn't opening. All you need to do is remove it and clean the carbon and reinstall.
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Old 08-18-2004, 04:52 PM   #12
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Default

"
if you block off a working egr valve does it affect you performance ? my buddy says yes that you lose hp ,but i say no that you gain slight hp 1-5. cause all it does is allow co2 to go back into the engine." lol. the egr is closed when you are accelerating unless you are barely on the throttle. so blocking it will not add power.
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Old 08-18-2004, 10:47 PM   #13
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Default Re: (nota944mechanic)

up fer da peeps
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Old 08-19-2004, 05:35 AM   #14
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Default Re: (flosSIn)

The EGR is only open at part throttle. It's purpose is to cool the combustion temps during the stoich conditions of closed loop operation. It is also beneficial for reducing NOx emmisions (during part throttle). It is closed during open loop. Blocking the EGR does not increase performance.
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