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2001 Pontiac Montana

Tiny
SNOT
  • MEMBER
  • 2001 PONTIAC MONTANA
2001 Pontiac Montana 6 cyl Front Wheel Drive Automatic

vans bogs down while driving intermitten, rpm up and down no engine lights come on, computor checked no codes given for a problem, changed tps, map censor ran good for a week back to same problem, changed cat, good for a week problem started again, idles fine and problem does not occor when you drive backward only happen driving forward
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Wednesday, December 17th, 2008 AT 10:43 AM

9 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
You probably have, but I have to ask being it wasn't on your list, changed fuel filter? Next thing, would be to check fuel pressure and make sure you have good vacuum to the pressure regulator. Please advise.
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Wednesday, December 17th, 2008 AT 10:41 PM
Tiny
SNOT
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Good morning, yes fuel filter was changed, and fuel pressure was checked, complete from a to z tune up was done after complete rebuild of the motor from the block up new head gasket, heads, every gasket inbetween the whole nine yards since the head gasket went in july of this year, changed any vacume hose I didn't like the shape of etc, etc.
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Thursday, December 18th, 2008 AT 6:45 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Please bear with me, I'm trying to narrow this down. When the engine rpms variys up and down, does the van speed vary accordingly? Does this "surging" happen in all gears or just high? Please advise. In the interum, I need to do a little research.
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Thursday, December 18th, 2008 AT 9:36 PM
Tiny
SNOT
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  • 6 POSTS
Good morning, when the rpm variys up and down no the speed does not vary accordinly, it's stilll trying to bog down when rpm go up and down and it does it in all gears except for reverse
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Friday, December 19th, 2008 AT 5:38 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
What I'm trying to determine is, ift's an engine or transmission problem. Does it seemlike the trans is slipping?
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Saturday, December 20th, 2008 AT 11:55 AM
Tiny
SNOT
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  • 6 POSTS
The transmissiion is not slipping, changes gears smoothly, not crunching, or anything out of the ordinary, was thinking speed sencor, had check it's fine
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Tuesday, December 23rd, 2008 AT 8:14 AM
Tiny
JAMES W.
  • MECHANIC
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With the engine at a warm idle, trans in park, and you floorboard the throttle, does the engine hold back or struggle for rpms?
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Sunday, December 28th, 2008 AT 1:33 PM
Tiny
SNOT
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  • 6 POSTS
If you mean in park and floor it whens it warm, it does not struggle whats so ever, everything is in accordance what it's suppose to do. Latest what I have done is cleared the computer with a scanner, not by unhookig the battery and knock on wood it's been running fine go figure.
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Monday, December 29th, 2008 AT 9:33 AM
Tiny
JAMES W.
  • MECHANIC
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What I was looking for was a possible plugged converter. But, if you didn't have any rpm struggle, it must be ok. Let me know what transpires.
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Tuesday, December 30th, 2008 AT 9:19 PM

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