The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-12-2019, 12:11 AM   #1
randywa
Registered User
 
Join Date: Nov 2012
Location: Republic, Mo.
Posts: 32
93 5.7 EGR question

On my 93 1/2 ton with 5.7 TBI I'm still getting a code 32 for the EGR. The check engine light doesn't come on every trip, but when it does it's always at light throttle at highway speeds. I've replaced the EGR vacuum solenoid. To get an idea of what is happening to throw the light I teed in a vacuum gauge between the solenoid and EGR valve have an indicator light wired into the solenoid. What I've found out is less than a second before the check engine light comes on the solenoid indicator light will blink off for a split second. Before the vacuum can even drop to 0 the indicator is back on. It's done this each time the check engine light has come on. Is this telling me the problem is either in the wiring or ECM instead of the EGR? It doesn't cause it to run bad, I just hate a check engine light. Thanks for any info.
randywa is offline   Reply With Quote
Old 02-12-2019, 02:20 AM   #2
EVRLET
Active Member
 
EVRLET's Avatar
 
Join Date: Aug 2015
Location: Las Vegas NV
Posts: 125
Re: 93 5.7 EGR question

This should help you, read all the posts...

https://www.chevytalk.org/fusionbb/s...hp?tid/258416/
__________________
Customization is what you want it to look like -- not what other people think it should look like
EVRLET is offline   Reply With Quote
Old 02-12-2019, 05:02 PM   #3
ChevyTech
Registered User
 
Join Date: May 2004
Location: Minnesota
Posts: 4,457
Re: 93 5.7 EGR question

I am the same ChevyTech that is in that thread that EVRLET posted a link to. Use the tests in that thread to get as far as you can and then ask questions here and I will try to walk you through it.

The first test I would suggest is to put a hand vacuum pump on the EGR valve and see if it will open with the engine off.
__________________
For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
ChevyTech is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:48 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com