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Sep 26, 2007 | 04:28 PM

cgb86c4

Thread Starter

Instructor

Joined: Sep 2007

Posts: 134

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From: Charlottesville Virginia

I need some help

Yesterday driving home from work my 86 c4 started to miss. I was driving around 65mph for about 8 miles when the service engine soon light came on, then when I slowed down to make a turn the car started to have a slight miss, but after I accerated it went away and after a mile the light went off. I drove about 2 more miles then as I was making another turn it started to miss again. then it went away after I accelerated. I have replaced all the plugs, wires, cap, and rotor. It has done this befor but not as bad as yesterday. It seems to do this after driving 15-20 mile trips. On shorter trips I don't. Any Ideas. ALso this may be a factor, that it did not do this on the way to work, The temp outside was about 65 degress in the morning, and around 90 degress in the afternoon going home.

someone told me it may be the EGR valve, but I wanted to get other ideas before I start tearing things down and trying different things and waste alot of money.

Sep 26, 2007 | 04:34 PM

mdlfcrss

Burning Brakes

Joined: Aug 2006

Posts: 1,123

Likes: 1

From: Rockland County NY

Maybe a fuel supply problem? Try checking the fuel pump & pressure regulator. 'Search' for how to's... good luck

Sep 26, 2007 | 05:46 PM

PAINTER MAN

Burning Brakes

Joined: May 2004

Posts: 1,230

Likes: 27

From: Athens Ohio

Sounds like an EGR problem to me.

Sep 26, 2007 | 10:19 PM

moserbe

Race Director

Joined: Dec 2005

Posts: 11,664

Likes: 15

From: Wellsboro Pa

Have you checked for codes yet?

Sep 29, 2007 | 10:44 PM

cgb86c4

Thread Starter

Instructor

Joined: Sep 2007

Posts: 134

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From: Charlottesville Virginia

Well I put a code tester on it today and it gave me code 32 which said it was the EGR vavle. So I am going to buy one and replace it. If that does the trick I will let you all know.

Sep 30, 2007 | 12:31 AM

C4boy

Melting Slicks

Joined: Apr 2003

Posts: 3,110

Likes: 6

From: Red Sox Nation! RI

I'd take a good guess that the code is due to a bad EGR temp sensor. Take a look at it and see if the porcelean is cracked or if the wire in it spins.

Before you go through pulling the plenum and replacing the valve, it might be worth checking by applying some vacuum to it via the vacuum line and see if it holds. Good luck.

Sep 30, 2007 | 01:18 AM

cgb86c4

Thread Starter

Instructor

Joined: Sep 2007

Posts: 134

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From: Charlottesville Virginia

So You Think The Egr Temp Sensor Could Cause The Car To Miss Out Also.

Sep 30, 2007 | 01:32 PM

C4boy

Melting Slicks

Joined: Apr 2003

Posts: 3,110

Likes: 6

From: Red Sox Nation! RI

I don't think it would cause a miss. There are only 3 things in the EGR system - The EGR valve, the EGR solenoid and the EGR temp switch. The temp switch is the cause of a code 32 the majority of the time because the porcelean connection is prone to breaking.

If you want to test the valve itself, follow the vacuum hose coming off it and disconnect it at some point where you can reach it. Connect a vacuum pump/gauge to the hose and apply around 12" of vacuum. If the vacuum holds, the valve is ok. If you don't have a pump, you can rent them free at Autozone. This is easier than removing the plenum to test the valve.

The other 2 items to check are the solenoid and the temp switch. If you don't have a service manual, here's a link to some test procedures that Agent 86 has been nice enough to post.

http://members.shaw.ca/corvette86/EGR%20System.pdf