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Old 12-11-2004, 09:26 AM   #1
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My car runs worse after cleaning EGR valve!?

Thanks for looking!

I recently replaced my spark plugs (with Nissan parts plugs) and also dismantled and cleaned my EGR valve, because my car failed the NO2 aircare testing, in my 92 Maxima V6 SOHC.

Now, however, I've noticed the idle acting strangely--when I slow down for a traffic light, the engine RPM's seems to drop very quickly into the idle, dipping to about 500rmps, then settling around 700rpm's. The engine sounds like it might stall, but doesn't. My gas mileage is noticable worse now as well.

Any ideas what this could be?

Much appreciated.
Dab
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Old 12-11-2004, 09:31 AM   #2
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what did you use to clean it? and did you use a new gasket when installing?
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Old 12-11-2004, 09:39 AM   #3
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TB cleaner.....

Used throttle body cleaner and replaced with new gaskets. But did notice that afterwards when I disconnected the vac hose, there was no change...the engine continued to run smoothly.

Thanks
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Old 12-11-2004, 10:57 AM   #4
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Quote:
Originally Posted by Dabhar59
Used throttle body cleaner and replaced with new gaskets. But did notice that afterwards when I disconnected the vac hose, there was no change...the engine continued to run smoothly.

Thanks
Sounds like possibly the EGR is stuck open slightly. Rev the engine and feel the EGR move with your other hand. Try and see if it stays open after a few revs.
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Old 12-11-2004, 11:48 AM   #5
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oh oh

When I rev the engine, the EGR diaphram doesn't seem move at all, but when I push up on it, the engine acts like its going to stall.
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Old 12-11-2004, 12:59 PM   #6
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Quote:
Originally Posted by Dabhar59
When I rev the engine, the EGR diaphram doesn't seem move at all, but when I push up on it, the engine acts like its going to stall.

Ok, it sounds like you have the same problem I did -- the vacuum source that opens and closes the EGR valve is bad. It could either be the EGRC solenoid, or the vacuum port itself. Also, if the EGR valve isn't opening at all, it shouldn't cause the idle problems you are having. I wish you good luck. Start checking any and all vacuum hoses for cracks or leaks. I don't own a VG so I can't get more specific than that, sorry.
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Old 12-11-2004, 01:03 PM   #7
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Makes sense....

That makes sense....that the vacuum source is bad. I hope someone who knows what that is makes a posting.

Thanks for your help!
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Old 12-11-2004, 11:43 PM   #8
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Quote:
Originally Posted by Dabhar59
That makes sense....that the vacuum source is bad. I hope someone who knows what that is makes a posting.

Thanks for your help!
Dab
Make sure you dont have the vaccum lines mixed up. The vaccum line leading to the EGR should not have any vaccum at idle. Check to make sure it doesnt. Also if you disconnect the vaccum line does the car idle better? The vaccum to the EGR only starts when you rev the engine.
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Old 12-11-2004, 11:44 PM   #9
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If the EGR has vaccum at idle it will run like crap.
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Old 04-25-2006, 05:24 AM   #10
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HEY. Know this is an old thread but this seems similar to a problem I JUST got today while driving down the highway.

I came to a toll and as I slowed down the car started to chug and I thought it was going to cut out. This continued a tiny bit after I accelerated away. Once I got to about 65 though it did NOT happen anymore. It was only after I started to slow down again that the problem reoccured.

I haven't touched anything on the car. Could this be some bad vaccum line? How can I find out and is it simple to replace?

This is for a 93 max
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Old 04-25-2006, 10:00 AM   #11
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bumpy-ity bump
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Old 04-25-2006, 05:40 PM   #12
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I had the same problem , it was the solenoid.
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Old 04-26-2006, 02:31 PM   #13
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you ever heard of *DO NOT CLEAN INTAKE MANIFOLD* ?... i tyhink some IM's say that but anyways

since you cleaned it with that stuff... the sensors are probably not registering the correct air / fuel crap... i know its the EGR and stuff but thats probably why its running bad... its the computer maybe

reason why im telling you this is because my friend did this to his and it ran bad it'll just take time and clean itself out of all the cleaner you used then it might run propely after that hope im right
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Old 04-26-2006, 02:31 PM
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