Check engine light?

On pre-1995 cars you could jump between two of the pins and read the codes that were stored in the computer. 1995 and newer cars require the use of the OBDII scanner to retrieve the codes.

This guide will show you how

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please run down this guide and report back.

Hi I am a mechanic, im working on this car for a friend and its runs decent but it is running way too rich on the second cylinder from the drivers side, pulled all the plugs and they were ALL golden brown but the one was wet, so I replaced all the plugs anyways, and replaced a bad vaccum line, changed the oil, changed the fuel filter, and ran injector cleaner thru it, did the ear check with a screw driver to each injector and all seem to be working just fine, took the car for a test drive and when I dropped it into first and florred it, it hit a little over 30 and sounded like it was hitting a rev limiter but it wasnt, and at the same time the coolent light and check engine light would flash back and fourth PLZ help! Its a 2.3 liter quad DOHC 16 valve

My 1995 grand am 2.3l quad 4 runs great at idle but under load or quick acceleration stumbles I have changed the coils the fuel filter and checked the gap on plugs (0.060) and changed the o2 got code from snapon scan tool #55 could this be a bad ground? Did notice the ground for the ecm needed to be cleaned up

Hello. I have a problem with my car. The check engine light comes on and I had a scanner put on it. The scanner came up with a fault code for the O2 sensor, open circuit. So I cut the wire and spliced it and made a new connection. Then I tested the voltage into the ecm and the voltage is only fluctuating between.1 and.2 volts, and even before I spliced it, I also tested it and it was the same, when it sould be between.4 and.5. I also bought a new 02 sensor and it still has the fault for an open 02 circuit. Please can you help me!

Yes the code is 13. I also tested the ground and it is good. I spliced the wire under the hood near where the harness goes into the ecm and it is still in the circuit.

I have a 1994 Pontiac grand am 4 cyclinder and engine light is on. I looked up how to test the obd but nothing is working. The connector only has 3 pins. 2 pins on top left and 1 pin bottom left.
How do I go about testing it. It does not have any other pins just the 3 on left side of connector
If need a picture I can get that
Thank s very much

Engine Performance problem
1994 Pontiac Grand Am 6 cyl Two Wheel Drive Automatic

while driving after about an hour the check engine light comes on there are no other problems the car runs fine I have driven it several times the past owner said there were no problems with car the car starts up very well afte I turn off car the light goes off and dnt come on agian till im driving agian after about an hour later

1993 Pontiac Grand Am SE V6 3.3L mileage: 157,000
Hello everyone this problem has started when I bought the car it was sold as is. I just bought it one month ago at a used car lot. The problem is when im driving or the engine is cold the check oil light & the service engine light with the check gauges light come on & blink. The oil gauge is at 120psi when its cold but it goes down when it starts to get warm. I have given the car a tune up myself. I took it to a mechanic he couldn't figure out what the problem was. I then took it to one of my brothers who knows alot about cars to. We removed the oil sending unit and the oil level sensor that goes to the oil pan. Replaced them with new ones. That stopped the light for a few days but it keeps on coming on now. I know the car is at level with the oil & its not heating up im just so frustrated with this I have no idea who to ask anymore.? I would really appreciate some help with this im totally clueless.

Update

Their were two problems

1st Problem: Bad Cluster
Check Oil Light + Check Gauges Light

2nd Problem: Engine Vacume Leak
Service Engine Light

Check engine soon light

Hi, my grand am, when I start the car "normally" the check engine light comes on and the engie idles really slowly and heavily, ie the car rumbles and can shake for a minute, after idling for a minute the engine speed will level off and sound more normal however when I go to press on the gas pedal and drive off the engine hesetates and drives like a tank, there is clearly no power and the engine will heat up very quickly but won't overheat. Now I had the engine tuned up at my local midas, "level 2 service" according to the bill which they said should fix it. It worked for a week. They said whent hey scanned the computer they were getting a "long cranking code error" now whe I took it back tehy rescanned and said it was the same error and it was most likely becasue the car was old. This was about 1 year ago, Now I recently learned that if I crank the engine for a minute but don't allow it to start, then wait for the lights and stuff to shut off and then recrank the engine it starts very quickly with no check engine light. Also if I am driving and the check engine light came on at startup that if I get to 60km/h I can pull a fuse, top eft I think it's labelled ECM, wait 5 seconds while costing the engine sounds like it stalls the speedometer drops to zero and the check engine light flickers, once I plug it back in the engine starts running and everyhting comes back on and the engine runs wonderfully. Now I was wondering what is causing this, it's a new starter, new spark plugs(not sure about the spark plug wires) but what I can't figure out is why it does this, is it the computer? I bought a a reader, I turn the car to on but don't start it and the check engine light blinks out the codes that are stored, I get code 42 all the time and once and a while code 33, right now that one isn't there jsut 42. Thanks for any help!

The vin, which i'm assuming is the vehicle identification number is 1g2ne54u3mc510398 it's a 2.5L LE model 91 pontiac grand am.