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1989 Chevy Silverado Excessive Fuel

Tiny
DLESATZ
  • MEMBER
  • 1989 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 292,000 MILES
"I have an '89 Chevy 4X4 1500 w/350 and auto trans. It used to get good mileage, 17-19mpg and now it is doing very poorly 1/8 of a tank to 30-35 miles. I have replace the complete fuel system from the TBI to and too include the tank. I have checked all the sensors and they seem to be in spec. I have installed new injectors and regulator in the TBI. But hot or cold, it stills smells rich coming from the exhaust. I really could use some help here. " All fuel lines and the fuel pump have been replaced. Checked for intake manifold vacuum leaks a TBI and heads. No change in idle.
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Friday, November 27th, 2009 AT 5:15 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Since you've check the CTS/O2 sensors and it checked out -try checking the fuel pressure if its within specs, also inspect the fuel return line for blockage
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Friday, November 27th, 2009 AT 5:37 PM
Tiny
CCOBURN
  • MEMBER
  • 1 POST
When mine was new 1991 or so, the dealer replaced the coolant tempo sensor on the thermostat housing.

It can causes the ECM to think the coolant is 100% cold or 100% hot in the range of the sensor. If the ECM thinks the coolant is cold, it will run in warm-up mode which is really rich. It was also having a hard time starting.

Also, you said you checked the sensors. How about the sensor plugs and wires?
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Tuesday, December 8th, 2009 AT 10:37 PM

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