2004 Montana hesitates breifly at cruising speeds feel like a stall

Asked by Feb 22, 2012 at 08:22 PM about the 2004 Pontiac Montana

Question type: Maintenance & Repair

from time to time while cruising at about100km hr the veh will jerk as tho it had stalled ...just momentarily and infrequent

7 Answers

55

sounds like a misfire

1 out of 1 people think this is helpful.
725

which motor? any codes? could be any number of things...

Thanks...any ideas on what would cause a misfire? It i9s the 6+cyl ...no codes

725

service engine or check engine light will turn on. a code reader will read the code and put it into words. quite possibly a misfire. sometimes this is caused by the crankshaft position sensor, i had the 3.8L V6 motor and replaced this sensor once. no problems after it was replaced with a new one. also a good idea to change the pcv assembly.

1 out of 1 people think this is helpful.

Thanks Mike...I will look into the crankshaft sensor...BTW engine light has been on for months...had machanic check it over and he could not find a reason?

725

Sometimes it is not a mechanical issue, and a sensor has reached its lifetime. It is still a good practice to have a licensed and certified technician have a look and go through the diagnostic process to get to the root of the issue. All the best friend.

I had the same problem, the first time , I changed the Coils, wires and spark plugs. that lasted a year. the last time I changed the Ignition module.

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