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Rough and rich running

Tiny
SCORPEON40
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 205,000 MILES
My vehicle is running rough and super rich. Service engine light flashing, but not coded code reader powers on but will not link I know 1996 was the first year mandated change over to obD 2. I have been told that my vehicle could be a 1995 and a half which means it possible that it can have a OBD 1.5. Help me please.
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Tuesday, July 5th, 2016 AT 8:19 AM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try another scanner first it may be an intermittent problem as well. also, check fuel pressure with a gauge should be 60-66 psi and when shut off should stay with in 5-10 psi for five minutes. Auto parts rents gauge.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Tuesday, July 5th, 2016 AT 9:26 AM
Tiny
SCORPEON40
  • MEMBER
  • 33 POSTS
Okay I will see about another scanner. And check fuel pressure. Thanks I will let you know.
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Wednesday, July 6th, 2016 AT 9:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
Those engines had a big problem with the spider injector inside the intake manifold, please remove the top half of the intake and check the pressure regulator for raw gas.
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Monday, July 11th, 2016 AT 6:54 PM
Tiny
SCORPEON40
  • MEMBER
  • 33 POSTS
I checked this couple days ago and I'm going to check my pressure gauge make sure that is accurate but it said I was having 87 pounds I've never seen one that much but would explain extreme rich but why
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Tuesday, July 19th, 2016 AT 1:21 PM
Tiny
SCORPEON40
  • MEMBER
  • 33 POSTS
Forgot to mention that I did check with another scanner I also have a Snap-On diagnostic computer and it also would not connect
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Tuesday, July 19th, 2016 AT 1:23 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then there is a short or bad connection at idle or wire that has power you'll have to try to find it. 87 psi is way to high check for a restricted return line and or regulator problem.
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Tuesday, July 19th, 2016 AT 1:28 PM

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