Rough idle intermittently

Asked by Feb 15, 2017 at 02:01 AM about the 1998 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

I have a 1998 grand am that will
suddenly start idling rough now and
then  , if I can gun it in neutral it
jumps to 4000 rpm then slowly goes
back to normal  , no check engine
light

7 Answers

125,965

Could be dirty injectors, when we're they ever professionally cleaned?

1 people found this helpful.

Been quite a while , I don't know why it shows no codes , the check engine light does work to

125,965

Just cause the check engine is not on doesn't mean there isn't a problem, sometimes it takes a live data scan to find a problem. I just had my own car started just dying at slow turns or stops, but it would start right back up, no check engine light, doing a live data scan I found the map sensor was reading 6000 feet above sea level and I'm at 460 feet, replaced the sensor and problem went away.

1 people found this helpful.
Best Answer Mark helpful

It's going to the shop tomorrow. I will let you know what they find

Thanks for your input

125,965

Hope it is an easy find, Thanks for the points.

Took the car in told them to do an engine diagnosis , they said it needs mass air flow sensor , spark plugs , water pump , the dealer charged $207 just for diagnosis and said labor and parts would be $1200 , water pump alone would have been $900 , this was at the dealer , I know a mechanic that said would charge $500 less , dealers are a rip off

Your Answer:

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 32 nationwide Grand Am listings and the tools to find you a great deal.

Postal Code:

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    8,210
  • #2
    John Saffrahn
    Reputation
    1,660
  • #3
    Js08016
    Reputation
    1,500
View All

Related Models For Sale

Used Pontiac Grand Prix
57 listings starting at $8,600
Used Pontiac Firebird
20 listings
Used Chevrolet Camaro
17 Great Deals out of 1,012 listings starting at $10,500
Used Ford Mustang
60 Great Deals out of 1,549 listings starting at $2,900
Used Honda Accord
32 Great Deals out of 1,781 listings starting at $1,998
Used Chevrolet Monte Carlo
13 listings starting at $7,999
Used Chevrolet Malibu
37 Great Deals out of 1,793 listings starting at $2,995
Used Toyota Camry
31 Great Deals out of 1,945 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.