TBI 350 idle problems?? - Off-Road Forums & Discussion Groups
GM Standard SFA Trucks & SUV's All discussion of full sized Solid Front Axle Trucks, SUV's to include Suburban

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 09-19-2005, 04:08 PM Thread Starter
 
Join Date: May 2004
Posts: 438
Thanks: 0
Thanked 0 Times in 0 Posts
 
TBI 350 idle problems??

My dads '89 Suburban has 80,000 mile on engine and we did a 3" lift, 4.56 gears/rear locker, TBI spacer, exhaust, 33/10.50 ProComp ATs, regeared transfercase speedo. More and more lately after startup the engine will idle erradically and bounce from 500-900 rpm and once in a while it dies. Once you start driving it goes away. Usually happens when starting hot. Any ideas??
Thanks much in advance! [img]/ubbthreads/images/graemlins/cussing.gif[/img] [img]/ubbthreads/images/graemlins/scs.gif[/img]
MontanaJeep is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 09-24-2005, 05:45 PM
Carpal \'Tunnel
 
wrath's Avatar
 
Join Date: Nov 2001
Location: Waukesha, WI
Posts: 3,323
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: TBI 350 idle problems??

I'd lean towards either fuel pump or MAP sensor.
wrath is offline  
post #3 of (permalink) Old 09-28-2005, 12:01 PM
 
Join Date: Mar 2004
Posts: 138
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: TBI 350 idle problems??

i just fixed that exact same problem with my chevy. take off the distributor and see if the rotor has any slop in it. if it does then replace the distributor. my truck would idle and sputter and cough and gag and then die. it frustrated me for awhile. i would check the dist. first then plugs and wires and fuel filter. good luck
forevertwowheels is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 11-28-2005, 02:43 PM
Way Outta Control
 
Join Date: Sep 1999
Location: usa
Posts: 10,815
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: TBI 350 idle problems??

I'm surpised than nobody said it's your tires.

Vacuum leak - worse at idle and when hot. Possibly the gaskets on the spacer.
RRich is offline  
post #5 of (permalink) Old 11-29-2005, 08:44 AM
 
Join Date: Sep 2005
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: TBI 350 idle problems??

Here's my two cents... I believe your Chevy has an EGR valve on the intake manifold behind the TBI? It has a vaccum hose going to it, unplug the hose from the valve and plug it with a golf tee or something. Lightly tap the EGR valve with a hammer to make sure it's not stuck in the open position. If it runs okay after doing this then you can just leave it disconnected or replace the valve. If you don't replace the valve you may have issues with passing emissions testing if the state your in tests for that.
Best of luck...
Wishin2BTrackin is offline  
post #6 of (permalink) Old 12-04-2005, 09:46 PM
Old Hand
 
Join Date: Oct 2005
Location: USA
Posts: 795
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: TBI 350 idle problems??

TPS sensor.

They are under $20 and about a 5 minute install. it is located on the even numbered side of the motor (2 4 6 8) on the side of the tbi. for what ever reason the screws that hold them in are not that strong, so be careful removing the sensor. i had one of the screws break off in the casting of the TBI, so don't force anything.
MouseMotor is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome