SPONSORED LINKS

1991 Chevrolet Silverado Idle problems

Tiny
BABE THE BLUE OX
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • 5.7L
  • V8
Ive got a 91 silverado 350 with some idle problems. When you first start it u need to give it throttle for a few seconds to keep er running and when she does stay running she idles really low, then if your not giving her gas and you cut the wheel shell cut out. Any ideas? Its got a new power steering pump and a nee belt new battery too im not sure if that would make any difference. Any suggestions as to what I can do would be greatly appreciated!
SPONSORED LINKS
Friday, July 17th, 2015 AT 4:14 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Have you checked for engine vacuum leaks? Have you checked the idle air control valve (IAC)? The IAC is responsible for maintaining engine idle speed.
Was this
answer
helpful?
Yes
No
+2
Friday, July 17th, 2015 AT 8:40 PM
Tiny
BABE THE BLUE OX
  • MEMBER
  • 6 POSTS
Ill have to check those out when I get the time, new to carb motors so im just looking for some starting points
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Saturday, July 18th, 2015 AT 9:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
A 91 shouldn't have a carb. Are you sure?
Was this
answer
helpful?
Yes
No
+1
Sunday, July 19th, 2015 AT 6:03 PM
Tiny
BABE THE BLUE OX
  • MEMBER
  • 6 POSTS
Quite sure got a great big air filter circle air filter on top the motor.
Was this
answer
helpful?
Yes
No
+1
Sunday, July 19th, 2015 AT 6:06 PM
Tiny
BABE THE BLUE OX
  • MEMBER
  • 6 POSTS
Only had the truck a couple days so I dont know a whole lot about it, ill send ya a picture in a hour or so when I get home
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, July 19th, 2015 AT 6:10 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I'll look for the pic. Chances are you have throttle body injection, which can look like a carb and have the round air filter housing.
Was this
answer
helpful?
Yes
No
Sunday, July 19th, 2015 AT 6:11 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I attached a pic of the TBI system on a 91 GM 5.7L. Let me know if this is what you have.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
+2
Sunday, July 19th, 2015 AT 6:13 PM
Tiny
BABE THE BLUE OX
  • MEMBER
  • 6 POSTS
Yeah I would say thats what it is, like I said ive never had a carburated motor before so its beyond my knowledge.
Was this
answer
helpful?
Yes
No
Sunday, July 19th, 2015 AT 6:14 PM
Tiny
BABE THE BLUE OX
  • MEMBER
  • 6 POSTS
Thats right under the filter right?
Was this
answer
helpful?
Yes
No
Sunday, July 19th, 2015 AT 6:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Yes, it's under the air filter housing. The two ports have injectors above them which spray fuel into the intake. This design is know as Throttle Body Injection (TBI).
Was this
answer
helpful?
Yes
No
Sunday, July 19th, 2015 AT 6:22 PM

Please login or register to post a reply.

Related Engine Idle Erratic Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
Instructional repair video
Idling High
GUIDE
Idling High
Intermittent sensor failure or shorting can cause the computer to act strange with unusual side effects, these problems are particularly tough to diagnose. The computer...
VIEW MORE

Sponsored links