2001 Pontiac Montana

2001 PONTIAC MONTANA
Avatar
SNOT
  • MEMBER
  • 6 POSTS
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
Dec 17, 2008 at 10:43 AM
Advertisement
Avatar
JAMES W.
  • CERTIFIED EXPERT
  • 2,394 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.
Dec 17, 2008 at 10:41 PM
Avatar
SNOT
  • MEMBER
  • 6 POSTS
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....
Dec 18, 2008 at 6:45 AM
Advertisement
Avatar
JAMES W.
  • CERTIFIED EXPERT
  • 2,394 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.
Dec 18, 2008 at 9:36 PM
Avatar
SNOT
  • MEMBER
  • 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
Dec 19, 2008 at 5:38 AM
Avatar
JAMES W.
  • CERTIFIED EXPERT
  • 2,394 POSTS
What I'm trying to determine is, ift's an engine or transmission problem. Does it seemlike the trans is slipping?
Dec 20, 2008 at 11:55 AM
Avatar
SNOT
  • MEMBER
  • 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
Dec 23, 2008 at 8:14 AM
Avatar
JAMES W.
  • CERTIFIED EXPERT
  • 2,394 POSTS
With the engine at a warm idle, trans in park, and you floorboard the throttle, does the engine hold back or struggle for rpms?
Dec 28, 2008 at 1:33 PM
Avatar
SNOT
  • MEMBER
  • 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.....
Dec 29, 2008 at 9:33 AM
Avatar
JAMES W.
  • CERTIFIED EXPERT
  • 2,394 POSTS
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.
Dec 30, 2008 at 9:19 PM