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Old 01-16-2009, 11:46 PM   #1
cappy58
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Default EGR or solenoid?

I have a 94 sl2 that stumbles from a stop on acceleration. I replaced both thermal sensors and the O2 sensor. When i unplug the vacuum hose to the EGR and plug the hose, the stumbling goes away and it accelerates very smoothly. So I am thinking the EGR is OK as it closes without the vacuum hose attached. Could the fault be the solenoid that regulates the vacume to the EGR?
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Old 01-17-2009, 12:08 AM   #2
Growser
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Default Re: EGR or solenoid?

Are you using copper (preferably NGK) plugs? And have you replaced the spark plug wires?

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Old 01-17-2009, 12:30 AM   #3
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Default Re: EGR or solenoid?

Quote:
Originally Posted by cappy58 View Post
...When i unplug the vacuum hose to the EGR and plug the hose, the stumbling goes away and it accelerates very smoothly. So I am thinking the EGR is OK as it closes without the vacuum hose attached. Could the fault be the solenoid that regulates the vacume to the EGR?
Yep! When you replace the egr solenoid, clean the egr valve too.

...
VCX NANO

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Old 01-17-2009, 12:52 AM   #4
93SC2'in
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Default Re: EGR or solenoid?

if it was the EGR solenoid it more than likely will throw code 32 i would try to pull out the egr and see how dirty it is before i bought a solenoid like 40$ from rock auto and i think my local kragens wanted like 80$! i went to a junkyard and pulled one and it ended up being good and it was free to boot

mine went out and would throw a code on the freeway it was staying closed all the time anywhere above 45mph i would see that damn SES come on until i went back to idle

you can also put a hand held vacuum pump "you know those cheap plastic ones" and put the hose on the egr and see if the diaphragm moves that should indicate if your egr is good or not

...
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Old 01-17-2009, 01:11 AM   #5
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Default Re: EGR or solenoid?

Welcome to the Board.


Light throttle engine stumble on a vacuum operated EGR is a blocked EGR vacuum bleed. The only fix is to replace the EGR valve. The vacuum bleed prevents the EGR from opening to fast. When it gets plugged up (it is internal and I know no way of unplugging it) the EGR opens to quickly and the engine stumbles due to to much EGR flow.

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Old 01-17-2009, 02:10 AM   #6
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Default Re: EGR or solenoid?

are there any ill effects of just blocking the egr off?.. ive heard of alot of people doing this on various cars

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Old 01-21-2009, 02:41 PM   #7
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Default Re: EGR or solenoid?

Quote:
Originally Posted by 93SC2'in View Post
are there any ill effects of just blocking the egr off?..
I ran my '94 SL1 for years with a golf tee in the EGR hose . . . passed Colorado emissions tests with no problems. With no EGR . . combustion temps will be hotter, it will produce more NOX pollution, and it may tend to knock more (mine didn't). I'm told that you actually get slightly more hydrocarbon pollution with EGR, but that the environmentalists think NOX is a more serious problem. So . . in my opinion . . no . . there's not much negative consequence to either blocking off the EGR or pulling and plugging the hose (which does the same thing by leaving the EGR always closed)

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