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1998 Chevy Truck Excessive Fuel Consumption

Tiny
JASTAD
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 114,000 MILES
Hello,

I have 1998 Chevy K2500 with a 350 V8. I just had a used motor put in the vehicle two months ago. Ever since my gas mileage has been terrible. It’s been around 11 miles per gallon. I had another mechanic look it over, and he has replaced the fuel injectors, computer, and O2 Sensors but its still reading the truck is running rich. He also tested if there was a vacuum leak but he said there wasn’t. Do you have any Ideas?

John
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Wednesday, July 23rd, 2008 AT 2:43 PM

4 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
How is the compression in the used engine?
Check engine light come on?
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Wednesday, July 23rd, 2008 AT 2:54 PM
Tiny
JASTAD
  • MEMBER
  • 8 POSTS
Yes the Check engine light is on. That is what is telling us the engine is running rich. And compression is good.
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Thursday, July 24th, 2008 AT 10:02 AM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
If you have a diagnostic scanner check the MAF and see what injector pulse width and does engine have a 195 temp thermostat?
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Thursday, July 24th, 2008 AT 3:54 PM
Tiny
JASTAD
  • MEMBER
  • 8 POSTS
We actually switched out the MAF with a new one and that was not what was causing it.

How do I check Injector Pulse?
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Thursday, July 24th, 2008 AT 4:40 PM

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