Black smoke, 1987 Chevy siburban v 20 4X4,2000 miles on new

Tiny
JOE MACC
  • MEMBER
  • 1987 CHEVROLET SUBURBAN
My 87 suburban blows black smoke n hesitates usually when going up hill at high speeds{65 to plus mph]gas milage is 6mpg copaired to the usual 13 to 15.I changed the throttle body, removed the cat, changed 02sensor, changed fuel filter, all tune up parts are new. Check engine code reads rich burn. This is a 1987 suburban with a 350, throttle body injection. Original milage is 102,000, but only 2000 on new engine
Do you
have the same problem?
Yes
No
Thursday, July 6th, 2006 AT 1:23 AM

1 Reply

Tiny
MIKEYBDMAN
  • MEMBER
This might be reaching, but I would have a fuel pressure test done. If the return line becomes clogged, the fuel pressure may build too high causing problems.
The proper fuel pressure should be between 62-89 psi.
Good luck.
Was this
answer
helpful?
Yes
No
Friday, July 7th, 2006 AT 8:42 PM

Please login or register to post a reply.

Recommended Guides