1995 Buick Lesabre exhaust manifolds turning red

Tiny
JOHN1617
  • MEMBER
  • 1995 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
I took the motor out to put another transmission on it and put it all back togather and now when I start it up the exhaust manifolds get red hot.I thought maybe the cataletic converter was doing it but I disconected the exhaust before the converter and it still gets red. The motor has no miss or hesitation in it like the timing would be off it runs smooth.I was wondering if it could be a problem with the fuel like running to rich or lean or maybe the fuel pressure regulator? Wondering if anyone had any ideas? Thanks alot.
Monday, July 21st, 2008 AT 6:29 PM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
It gets redhot at idle?

I would suspect a severly lean engine fuel mixture, could even be rich.

Even if the timing is off it could be causing that to happen also.
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Monday, July 21st, 2008 AT 8:09 PM
Tiny
JOHN1617
  • MEMBER
  • 2 POSTS
Yes it takes about 3 or 4 min. To get red thats at a idle.
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Tuesday, July 22nd, 2008 AT 3:42 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Check for a lean air mixture if thats the case. You have a bad o2 sensor or a vaccum/air intake?
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Tuesday, July 22nd, 2008 AT 7:35 PM

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