check engine light stays on. fixed myself & repair shop too but problem continues. suggestiions?

Asked by Sep 03, 2008 at 08:13 PM about the 1985 Oldsmobile Cutlass Supreme

Question type: Maintenance & Repair

3 Answers

5,285

If you can describe what code caused the check engine light to stay on, would be easier to zero in on the source of the problem. It depends if what was repaired was what really caused the problem to begin with. Suggested sources would be www.alldatadiy.com or Mitchell Online, which not only mentions possible codes for a vehicle, but also a flow chart to find the problem. If you go one of those roots, it is important not to skip steps to avoid misdiagnosing and/or unnecessary parts replacement. Sometimes the problem could be as easy as fixing a broken wire circuit. Hopefullly that could get you going in the right direction.

1 people found this helpful.
95

Assuming you have the On Board Diagnostic system (OBD), the problem will be much easier to diagnose. All vehicles produced prior 1996 were equipped with OBD1. There should be a large plastic plug in easily accessible under your dash near the steering column. You can read the codes with a simple paper clip. The plug in has quite a few cells used for plugging a scan tool in, but you only need to put both ends of the paper clip into the top right two cells. Turn your ignition to "Run" (Engine is still off) before putting the paper clip in the plug in. The 'Check Engine Light' will begin to flash. It should repeat each code three times. For example, 12 would be read like so. The light would flash once, then after a very short pause, flash twice. That would mean Code 12. After it runs through all the codes, it should repeat the process as long as the paper clip is plugged into the plugin.

3 people found this helpful.
95

Sorry, I forgot to mention. It is highly recommended you find a shop manual specific to your Oldsmobile. Purchase one off of eBay. Don't buy a 1986 Oldsmobile Cutlass Supreme Service Manual if you have a 1985. There are differences, even if the vehicle looks exactly the same as one the year after it. Buying a GM Service Manual will help you far more than any Haynes or Chilton Manual you can find at AutoZone.

Your Answer

Cutlass Supreme

Looking for a Used Cutlass Supreme in your area?

CarGurus has 75 nationwide Cutlass Supreme listings and the tools to find you a great deal.

ZIP:

Oldsmobile Cutlass Supreme Experts

  • #1
    munron
    Reputation
    710
  • #2
    tennisshoes
    Reputation
    430
  • #3
    Tom Demyan
    Reputation
    350
View All

Related Models For Sale

Used Chevrolet Monte Carlo
3 Great Deals out of 937 listings starting at $3,900
Used Oldsmobile 442
60 listings
Used Buick Regal
82 Great Deals out of 4,088 listings starting at $3,995
Used Chevrolet Camaro
224 Great Deals out of 28,922 listings starting at $3,900
Used Ford Mustang
270 Great Deals out of 37,081 listings starting at $2,150
Used Chevrolet Caprice
126 listings starting at $1,350
Used Chevrolet Impala
397 Great Deals out of 25,595 listings starting at $799
Used Dodge Charger
242 Great Deals out of 32,689 listings starting at $1,800

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.