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1991 Pontiac Grand Prix timing belt on a 3.4L

Tiny
MOTOKING_1990
  • MEMBER
  • 1991 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 99,986 MILES
I recently asked the question on why my car wouldn't start and I figured it out. I stripped the timing belt out on my 91 Grand Prix GTP 3.4L and my question now is, is the early 90s 3.4L v6 an inteference engine? I have talked to a few others online and one said it is but three others said the years 91 to 95 where not considered intereference motors. I would have done a leak down test but I do not have the tool to screw into the spark plug hole. But I will do a compression test to see if I bent a valve but til then I need to know if the engine is interference or not any information would be greatly appriciated
Thank you, Greg
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Wednesday, September 22nd, 2010 AT 9:09 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Alldata lists that engine as a "freewheeling" engine so you shouldn't have any damage. I have seen a few broken belts on those and never valve damage.

I want to warn you though. Do not attempt to change this yourself without the special tool kit. It is a complicated timing procedure too. Many techs have a lot of problems with it because the banks are timed 180 out of each other.
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Wednesday, September 22nd, 2010 AT 9:16 AM
Tiny
MOTOKING_1990
  • MEMBER
  • 10 POSTS
Thank you for responding so quickly. I live with an ase certified gm auto tech but he is out of town and I cannot get ahold of him. He uses alldata too thanks again
Greg
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Wednesday, September 22nd, 2010 AT 9:25 AM

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