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89 Blazer

Tiny
89BLAZERPROBLEM
  • MEMBER
  • 1989 CHEVROLET BLAZER
  • V8
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
Ok as before k5 with 5.7 tbi my problem as before is the same however seems to be affected by temp. Exp. Yesterday 32 outside when I left ran great 65 when I came home and from the moment I started it it ran terrible stuttering or cutting out as if starving only code it shows is 44 lean condition thanks for your help
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Thursday, March 17th, 2011 AT 11:52 AM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
How long since a tune-up? I'd want to look at the 02 sensor signal. To see if it is showing lean? If it is lean, try to richen the the system, see if idle smooths out and if the 02 sensor signal changes.
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Thursday, June 16th, 2011 AT 5:04 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check the gasket below the TBI unit they will blow and cause a vacuum leak, giving a lean condition. Also will run poorly.
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Saturday, June 18th, 2011 AT 4:15 PM

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