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 05-28-2010, 10:11 AM   #1
ChevHead77
Registered User
 
Join Date: May 2010
Location: plain city ohio
Posts: 4
Exclamation 1988 chevy 1500 5.7 not running right please help

ok so i bought this truck about a week ago and have been reading this site ever since and love it... my truck is a 2wd automatic 5.7 i have replaced the plugs wire cap and button o2 sensor top radiator hose.... all yeah its a 1988 sorry... when i baby the truck it seems to run fine sometimes when i gas it it bogs out and the check engine light comes on and the truck has no power if i stop shut the truck off and restart it it seems to run ok again till i hit the gas about 1/2 way down then the same problem.. the egr valve is pluged wondering if this could cause the problem i also removed the cat on it b/c i thought that was the problem sorry i dont know the ses light codes yet not til sunday thanks n e help would be greatly appericated thanks justin i belive the truck is all stock also
ChevHead77 is offline   Reply With Quote
Old 05-28-2010, 11:46 AM   #2
TennesseeZ
Countdown Survivor
 
TennesseeZ's Avatar
 
Join Date: Aug 2007
Location: Bean Station, East Tennessee
Posts: 9,676
Re: 1988 chevy 1500 5.7 not running right please help

Here's how to read the codes, and what they mean.

The codes flash three times each.

The first one should be "12" ie: one flash, long pause, flash, short pause, flash, long pause, same thing 2 more times. Like one, one two...............One, one two........... This tells you the diagnostic system is working correctly.

Then the trouble codes will flash, same as above, and 3 times each. Write them down.

When it's finished it goes back to code 12, and will flash that till you turn the key off.

Post back what you find.
__________________
93 Yukon
89 Silverado Z71 SWB Sport
91 K 2500 Silverado "Lobuk-Worktruk"

A MAN OF HONOR DOES NOT LIE, CHEAT, OR STEAL, NOR TOLERATE THOSE WHO DO.

Gettin' old ain't for sissies.

Last edited by TennesseeZ; 05-28-2010 at 02:01 PM.
TennesseeZ is offline   Reply With Quote
Old 05-28-2010, 12:05 PM   #3
ChevHead77
Registered User
 
Join Date: May 2010
Location: plain city ohio
Posts: 4
Re: 1988 chevy 1500 5.7 not running right please help

Ok i just did didnt really understand all the flashing im getting ready to leave for work i willl try again tonight thanks tho
__________________
88 chevy 1500 5.7 350
GOD BLESS THE USA
ChevHead77 is offline   Reply With Quote
Old 05-28-2010, 12:08 PM   #4
TennesseeZ
Countdown Survivor
 
TennesseeZ's Avatar
 
Join Date: Aug 2007
Location: Bean Station, East Tennessee
Posts: 9,676
Re: 1988 chevy 1500 5.7 not running right please help

By the way, to the board!!
__________________
93 Yukon
89 Silverado Z71 SWB Sport
91 K 2500 Silverado "Lobuk-Worktruk"

A MAN OF HONOR DOES NOT LIE, CHEAT, OR STEAL, NOR TOLERATE THOSE WHO DO.

Gettin' old ain't for sissies.
TennesseeZ is offline   Reply With Quote
Old 05-28-2010, 03:45 PM   #5
88K2500
Registered User
 
88K2500's Avatar
 
Join Date: Apr 2010
Location: California
Posts: 72
Re: 1988 chevy 1500 5.7 not running right please help

Welcome to the board. Seems like there is alot of 88's around here.

The symptoms that you described sound like an esc issue and your truck is going into limp mode until you shut it off. Restart the truck and the light is off. My guess is that you will pull a code 43 which is a timing issue(just a guess).

Definetely buy a Chilton or Haynes manual if you don't already have one. Make sure that your timing is set at 0* with the est wire unplugged.

Also check all of your wiring for damage etc... These trucks are getting older and the wiring connectors are getting brittle and easily damaged from age. Post up your trouble code when you get it. Lots of people here are willing to help you figure it out. Good luck.
__________________
88' k2500 LB P/U,4x4, 5.7L, 2.5" Lift, 33"BFGs, 10K Warn

86' K2500 Suburban,4x4, 3/4 ton, 5.7L, 4" Lift, 33" BFGs
88K2500 is offline   Reply With Quote
Old 05-28-2010, 10:47 PM   #6
ChevHead77
Registered User
 
Join Date: May 2010
Location: plain city ohio
Posts: 4
Re: 1988 chevy 1500 5.7 not running right please help

would it run normal tho when im easy on the gas i drove it all the way easy on the gas tonight no problems just when i try to accelerate fast ....... bogs check engine light and then dont want to run.... my egr valve is also pluged if i buy i new one you think that will help than=ks
__________________
88 chevy 1500 5.7 350
GOD BLESS THE USA
ChevHead77 is offline   Reply With Quote
Reply

Bookmarks

Tags
1500, 350, chevy, tbi, truck


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 06:14 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com