1999 GMC Jimmy

Tiny
KETIENNE
  • MEMBER
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 174,000 MILES
I bought a 1999 jimmy. Will not start. Previous owner thought fuel pump was going out. But I can her pump engaging when I turn key on. Does anybody have any idea on what it could be? It turns over and about every 5or6th turn it sounds like it is firing.
Monday, August 23rd, 2010 AT 3:03 PM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
What is the fuel pressure?
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 3:16 PM
Tiny
KETIENNE
  • MEMBER
  • 4 POSTS
48 when I turn key on. When I try to start it it is 20.
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 3:57 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That's your problem. This engine won't even run if it gets under 55. It's a high pressure system and very sensitive to pressure.
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 4:27 PM
Tiny
KETIENNE
  • MEMBER
  • 4 POSTS
So new fuel pump? Or could it be a filter problem?
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 5:06 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The filter could have contributed to the fuel pump failure but won't be the direct cause of the issue. It should be changed automatically with the new pump to protect it. When they get restricted, they overwork the pump. The pump is strong enough to push through it but won't be for long.

Make sure you verify the contacts in the plug are good and tight too. They have a known problem with that.
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 5:09 PM
Tiny
KETIENNE
  • MEMBER
  • 4 POSTS
Thank you very much. I will be installing a new one tomorrow.
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 5:17 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Your welcome. Feedback is appreciated.
Was this
answer
helpful?
Yes
No
Monday, August 23rd, 2010 AT 5:27 PM

Please login or register to post a reply.

Related Engine Not Cranking Over Content

Car Not Cranking? Try This | EASY
VIDEO
Car Not Cranking? Try This | EASY
Instructional repair video
Starter Not Working
GUIDE
Starter Not Working
This guide is designed to help you identify whether the issue with your non-working starter motor is due to an electrical problem or a fault within the starter motor itself...
VIEW MORE