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Bad gas mileage 93 Nissan d 21 truck

Tiny
DUANE GALL
  • MEMBER
  • 1993 NISSAN TRUCK
1993 d21 pickup, 4wd 5 speed manual, very bad gas mileage, like around 5mpg in city, replace timing belt spark plugs, and clean injectors by dealer, no service lights, changed air filters, won't service light come on if oxygen senor not working 120,000 miles, what can I do
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Saturday, February 10th, 2007 AT 10:16 AM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Does your truck have an Fuel Pressure Regulator?Sometimes they blow, dumping raw fuel into the intake. The dealer should have been able to plug in and watch your o2 sensors to see if they are out of range. Does the truck accelerate OK? Timing belt done before mileage problem? Get back to me
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Sunday, February 11th, 2007 AT 8:06 AM
Tiny
DUANE GALL
  • MEMBER
  • 2 POSTS
No I just bought it 2 weeks ago, and was driving it to work and notice the bad mileage, it accelerates fine, no service lights, the dealer change the timing belt but it was like that before I took it to the dealer
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Sunday, February 11th, 2007 AT 1:11 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Off to the O2 sensors or MAF sensor if so equipped
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Monday, February 12th, 2007 AT 4:14 PM

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