rough idle on 2002 pontiac bonneville

10

Asked by Feb 01, 2015 at 09:57 PM about the 2002 Pontiac Bonneville SLE

Question type: Maintenance & Repair

I just bought a 2002 pontiac bonneville and my issue is that it idles rough and the code
comes previous owner said the code comes up as a misfire in cylinder 3. He said he
checked the coil packs and replaced spark plugs and wires and also the injectors. Any
other ideas on what this issue could be? I dont have much more information as i just
bought the vehicle yesterday.

3 Answers

64,975

Compression test that cylinder. If it's low, could be a burned/stuck valve or worn rings. What engine do you have and how many miles are on it? HTH. -Jim

10

3.8 191000 miles

1 out of 1 people think this is helpful.
64,975

Have the computer scanned to verify that what the previous owner told you is correct. Most auto parts stores will do it for free. At that mileage it's safe to assume that the intake manifold gaskets have been done. They usually failed between 90,000 and 120,000 miles. If it is a "dead" miss on cylinder number 3 definitely compression test that cylinder. If it's below 150 PSI something mechanical is going on. If it tests very low or zero it's a valve. If it's not very low, say around 120 to 140 PSI, squirt about a teaspoon full of motor oil in the spark plug hole and retest it. If the compression comes up it's going to be worn rings. Did the seller provide receipts for the new parts? If not, and the compression test reveals no problems, go back over what he claims to have replaced. HTH. -Jim

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • What GM model cluster fits a 2002 Pontiac Bonneville 1 answer

    What car has the same dashboard as the 2002 Pontiac Bonneville SLE

    2002 Pontiac Bonneville SLE

    -

    Maintenance & Repair

  • My 2002 Pontiac Bonneville gas gauge reads empty when the tank is full how do I 1 answer

    my gas gauge on my 2002 Pontiac Bonneville reads empty when the tank is full what's

    2002 Pontiac Bonneville SLE

    -

    Maintenance & Repair

  • 2002 Pontiac Bonneville not cranking 10 answers

    2002 Pontiac Bonneville non-supercharged is not cranking over when in START position. I have had the battery tested and it is good (only a year old). All the lights and gauges and other things even ...

    2002 Pontiac Bonneville SE

    -

    Maintenance & Repair

  • where is the heater fan located and if there is a relay on a 2002 bonneville 3.8 2 answers

    Just need to know where the heater fan is located and if there is a relay for a 2002 bonneville 3.8 My heater quit working, Will not blow at all. I have checked the one fuse which was located...

    2002 Pontiac Bonneville SE

    -

    Maintenance & Repair

  • Idle rough 3 answers

    My 2000 Pontiac Bonneville 3.8 liter engine when I crank it up it runs rough but in a minute or two it start running smooth, But when I place it in reverse or drive it start running rough and seem t...

    2000 Pontiac Bonneville

    -

    General

Bonneville

Looking for a Used Bonneville in your area?

CarGurus has 541 nationwide Bonneville listings starting at $3,699.

ZIP:

Search Pontiac Bonneville Questions

Pontiac Bonneville Experts

#1 ticklemedaly
ticklemedaly
Reputation 380
#2 dandyoun
dandyoun
Reputation 360
#3 Js08016
Js08016
Reputation 350
View All

Related Models For Sale

Used Pontiac Grand Prix
21 Great Deals out of 2,847 listings starting at $1,995
Used Chevrolet Impala
513 Great Deals out of 28,995 listings starting at $1,100
Used Chevrolet Monte Carlo
13 Great Deals out of 1,390 listings starting at $1,995
Used Buick LeSabre
6 Great Deals out of 1,964 listings starting at $1,500
Used Chevrolet Camaro
157 Great Deals out of 32,775 listings starting at $1,995
Used Pontiac Firebird
8 Great Deals out of 729 listings starting at $1,800
Used Ford Mustang
361 Great Deals out of 46,750 listings starting at $1,500
Used Pontiac Grand Am
1,218 listings starting at $950
Used Buick Regal
117 Great Deals out of 10,180 listings starting at $1,995
Used Toyota Camry
799 Great Deals out of 89,011 listings starting at $249
Used Cadillac DeVille
9 Great Deals out of 1,593 listings starting at $1,499