2003 Pontiac Montana Cylinder 5

Tiny
CLARISGARCIA
  • MEMBER
  • 2003 PONTIAC MONTANA
  • 3.4L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 202,000 MILES
My car turns of once in a while and the code that the machine is reading indicates that cylinder 5 is misfiring what does that mean? It has no power and the motor acks like is dying. Sometimes I drive and the motor feels like it cant go anymore and also I have to celarate so the car can stay on.
Friday, January 3rd, 2014 AT 3:58 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It means something is wrong with #5 cylinder like a spark plug/wire, injector etc. Have a pro diagnose this so you can get all your powerback and better fuel mileage.
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Friday, January 3rd, 2014 AT 4:03 PM
Tiny
CLARISGARCIA
  • MEMBER
  • 3 POSTS
I just change the spark plugs and the wires because I thought that was the problem but it still telling the same thing, ive been to 4 mechanics, 3 out of 4 tell me is the cylinder itself trying to charge me $450-500 in labor and one said it had something to do with the gasket and coolant leakage I dont know who to believe and I dont want to go spending on the wrong thing. What do u suggest?
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Friday, January 3rd, 2014 AT 9:38 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Misfire codes are very hard to diagnose it can be compression or any of the other things I've mentioned. Heed gasket leaks are usually found by pressure checking your coolant system as well as it being low on coolant all the time. If they believe it is a cylinder problem then a compression check would also show that. A 20% variance of pressures like 1350 in one an dand 120 in another would suggest something may be wrong. We dont' have that info available on your vehicle so it is hard to suggest what to do. Any competent mechanic should do a freeze frame on this car to make sure one of the sensors isn't going crazy causing it though
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Saturday, January 4th, 2014 AT 5:55 AM
Tiny
CLARISGARCIA
  • MEMBER
  • 3 POSTS
At this point im using process of elimination So lets say is a head gasket leak, how do I pressure check my coolant system?
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Saturday, January 4th, 2014 AT 6:44 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You fill it up with coolant and get apressure tester not sure auto parts have them to rent otherwise a pro will do it.
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Sunday, January 5th, 2014 AT 8:51 AM
Tiny
AARANA70
  • MEMBER
  • 1 POST
Did you solve your problem? I have same error mesage
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Monday, November 30th, 2015 AT 6:46 PM

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