Poor gas milage

Tiny
SPOTLESS
  • MEMBER
  • 1997 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 97,000 MILES
Poor gas milage. 1997 GMC 4x4. 350 engene
Do you
have the same problem?
Yes
No
Sunday, December 19th, 2010 AT 5:24 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
When was the last tune up?
Was this
answer
helpful?
Yes
No
Tuesday, January 4th, 2011 AT 4:44 PM
Tiny
SPOTLESS
  • MEMBER
I bought it at a Gm dealership. It had a complete tune up. Fuel filter, cap and rotor, new wires, new spark plugs, set to specs ( I pulled them and checked them myself ) new air filter, The lifters were checked and set to specs. The timing was checked and set to specs if needed. I also saw the work order for it. The truck has a throttle body on it. I was wondering if that had something to do with it or one of the sensors. I can normaly find the problem. But this is a stinker.
Thanks.
Was this
answer
helpful?
Yes
No
Tuesday, January 4th, 2011 AT 6:26 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Usually a sensor will set the check engine light. How bad is the mileage? Have you checked simple things such as vacuum leaks, partially plugged cat converter. As far as the TBI, I believe a 97 is multi-port injection.
Was this
answer
helpful?
Yes
No
Tuesday, January 4th, 2011 AT 11:26 PM
Tiny
SPOTLESS
  • MEMBER
I made a trip to Indiana by South Bend I left Murray Ky and I had to fill up at the outskirts of Indinaplis I averaged 16 miles per gallon. I don't remember how many gallons of gas I put in. That was about 320 miles I drove I had another 1997 GMC 4 wheel dr and got 19 to a gallon. I know it can do better. The best I got with my old truck was 20.5. I will have to check the TBI and see how many ports it has
Was this
answer
helpful?
Yes
No
Wednesday, January 5th, 2011 AT 2:14 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Honestly, for a GM that is a little lower than one would expect, but not too far out of line for a 350. That may be the best this vehicle gets.
Was this
answer
helpful?
Yes
No
Wednesday, January 5th, 2011 AT 1:00 PM

Please login or register to post a reply.

Recommended Guides