Full Size K5 (1969-1991) GMT415 (1992-1994) Tech Discuss any and all full size K5 general tech topics here.

1990 k5 blazer 5.7 idle issue

  #1  
Old 09-22-2014, 02:54 PM
Beginning Member
Thread Starter
Join Date: Jul 2014
Location: Illinois
Posts: 11
Randomtask2 is on a distinguished road
Default 1990 k5 blazer 5.7 idle issue

Hello again, So I'm temporarily stumped. My k5 will not idle without giving it gas. Idle air control valve replaced and connector, new fuel injectors, timing Is perfect, Drives perfect. Until you come to a stop then dies out. I am stumped. Any information will help thank you.
 
  #2  
Old 09-24-2014, 03:51 PM
jpimp's Avatar
Starting Member
Join Date: Nov 2010
Location: Canada
Posts: 165
jpimp is on a distinguished road
Default

any codes?
when was tune up last done?
 
  #3  
Old 09-26-2014, 11:31 AM
Beginning Member
Thread Starter
Join Date: Jul 2014
Location: Illinois
Posts: 11
Randomtask2 is on a distinguished road
Default

Originally Posted by jpimp View Post
any codes?
when was tune up last done?
There is no codes at all. Don't know the last time the tune up was done. But the plugs and wires don't look to be in that bad of shape so im assuming not too long ago. But im kind of ruling out spark being the issue. Because at high rpm she runs awesome no miss, no stumble, she doesn't skip a beat. This is only idle. Next on my list of possible causes. Because I need to give it gas to start it. Not getting enough fuel. Maybe the fuel pressure regulator. Next day off I will replace that.
 
  #4  
Old 09-27-2014, 10:13 AM
abig84's Avatar
BF Veteran
Join Date: Aug 2009
Location: munster indiana
Posts: 3,426
abig84 will become famous soon enoughabig84 will become famous soon enough
Default

check your egr valve. if they start to stick wide open they will cause a heck of a vacuum leak and cause your truck to die out, bypass it or block it to see if it fixes your problem.

it kinda looks like this
 
Attached Thumbnails 1990 k5 blazer 5.7 idle issue-egr17113408.jpg  
  #5  
Old 09-28-2014, 12:26 PM
Beginning Member
Thread Starter
Join Date: Jul 2014
Location: Illinois
Posts: 11
Randomtask2 is on a distinguished road
Default

Originally Posted by abig84 View Post
check your egr valve. if they start to stick wide open they will cause a heck of a vacuum leak and cause your truck to die out, bypass it or block it to see if it fixes your problem.

it kinda looks like this
The Egr valve is closed at idle and I checked to make sure it isn't frozen it moves freely.
 
  #6  
Old 10-01-2014, 12:56 PM
Beginning Member
Thread Starter
Join Date: Jul 2014
Location: Illinois
Posts: 11
Randomtask2 is on a distinguished road
Default

Well 90% of the time we don't check the most basic stuff 1st. It was a PCV valve no joke a 5 dollar fix lol
 
  #7  
Old 10-01-2014, 01:42 PM
HARDTRAILZ's Avatar
Starting Member
Join Date: Jun 2010
Location: SE Indiana: Batesvegas
Posts: 142
HARDTRAILZ is on a distinguished road
Default

At least it was not expensive and its fixed!
 
  #8  
Old 10-02-2014, 02:11 AM
Beginning Member
Thread Starter
Join Date: Jul 2014
Location: Illinois
Posts: 11
Randomtask2 is on a distinguished road
Default

Originally Posted by HARDTRAILZ View Post
At least it was not expensive and its fixed!
I cant tell you how shocked I am that it was that simple. lol
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Randomtask2
Lighting & Electrical
1
12-24-2018 10:22 AM
BOBOtheblazerguy
Full Size K5 (1969-1991) GMT415 (1992-1994) Tech
2
05-31-2012 05:06 AM
wollefdoog
1st Gen S-series (1983-1994) Tech
4
10-27-2011 11:13 PM
tjf76
Full Size K5 (1969-1991) GMT415 (1992-1994) Tech
10
07-10-2009 07:26 PM
the fuel
Engine & Internal
6
12-15-2005 01:25 AM


Thread Tools
Search this Thread
Quick Reply: 1990 k5 blazer 5.7 idle issue


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.