Service engine soon light

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
If the check engine light is on, the computer has stored a trouble code which will identify where the problem is coming from.

Take the car to a nationally recognized parts store and have them scan it. Most will do it for free, and then we will know what to do.

Let me know what you find.

Joe
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Monday, July 6th, 2020 AT 7:05 PM (Merged)
Tiny
CMJONES7
  • MEMBER
  • 2 POSTS
  • 1998 PONTIAC GRAND AM
  • 16 MILES
Okay I have a 98 Pontiac grand am and if it is hot outside or if I drive it for a while my car will start to***** when I try to accelerate when I am at a complete stop then takes a few seconds to pick up speed. It is like it is having a hard time to shift gears. Also, my car is running hot, so hot that it does the above things and even cuts off when I am sitting still whether it is at a stop light or whether I am just parked. My check engine light is not on at all. I dont know what the problem may be. I have a new engine, battery, reprogrammed computer, new starter, and some collapsed hoses have been replaced. I have spent entirely too much money over time trying to fix this car. If any has any suggestions on what may be the problem and about how much that may cost, it would be great!
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Is the engine overheating when you stop?
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
You might want to check the cooling system for pressure or do a compression/leakdown test.
Theis will telll you if there is a blown head gasket or other issues.
Check fuel pressure. Try running some high quality fuel system cleaner such as SEA FOAM or BG44K. You might have to go to a service station. Expect to pay $10-20 per can and run 2 cans. You willl need to change the oil afterwards as it works sos well the deposits it removes gets the oil dirty.

Ave you tuned it up? As in Spark Plugs, Plug Wires, etc? If so how long ago?

The intake and throttle body could be dirty, as well as the Idle Air Control Valve, (IACV), and the Fast Idle Thermo, (FIT). If the Intake tract and throttle body are dirty, that can affect performance. If they are dirty, the IACV, (which controls the idle as the engine load increases from; power steering, air conditioner, headlights, other accessories, etc. The FIT control the idle in sort of the same way, but it works when the motor is cold like a choke and it can fail which can affect the idle even after the motor is warmed up.

There are also emissions stuff like Exhaust gas return, Positive Crankcase Pressure, PCV Valve, etc. Which can have some affect but not as much as the other items.

Try the fuel cleaner and check tune up items as well as tests. Then get back to us.
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
CMJONES7
  • MEMBER
  • 2 POSTS
On an ordinary day when I stop the engine doesnt overheat but today it was. It sounds like the engine is rocking then my car cuts off. I checked my coolant level and it was good. I could feel the heat on my legs and feet while I was driving. But I will try the fuel cleaner and see if I need a tune up.
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
One other point. What are you using to measure temp?
You might want to spend $20 on an Infrared thermostat to have a consistant baseleine.
Make sure your cooling fans are coming on. Turn on A/C and make sure condenser fan comes on.
You could have a bad radiator cap or theremostat. Check for pressure after stopping and letting maotor sit just a minute if hot. Grab the upper radiator hose and if it has pressure, it is like a short version of the real pressure test.
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
SHARISHAFER
  • MEMBER
  • 3 POSTS
  • 1998 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 137,000 MILES
My daughters car just recently stopped going in gear. She can slide the shifter back and forth from reverse to drive and so on, it does'nt catch any gears. Her check engine light came on. Any suggestions?
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Have the PCM scanned for any codes. You can take it to most auto parts stores and get a free powertrain scan, however since it won't move you may as well tow it to a transmission shop or dealer, unless you can borrow a scan tool.

Hopefully it is an issue with the transmission linkage.
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Monday, July 6th, 2020 AT 7:21 PM (Merged)
Tiny
QUADRACER_87
  • MEMBER
  • 2 POSTS
  • PONTIAC GRAND AM
I have a 1998 Pontiac Grand AM GT with the 2.4l TWIN CAM engine. There is no power to the diagnostic plug and the check engine light does not come on when you turn on the key. Also when the key is turned on and the engine is initially cranked, there is a signal at the injector harness and the engine fires for one to two seconds and then the signal is lost at the injector harness. If you shut off the key the prossess will start over. Spark is not lost to the plugs and the fuel pump continues to run properly.
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Monday, July 6th, 2020 AT 7:22 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
First thing to check are the fuses both in the car and under the hood especially the ones marked PCM or ECM! If the fuse is NG you will have these symtoms, cross your fingers!
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Monday, July 6th, 2020 AT 7:22 PM (Merged)
Tiny
QUADRACER_87
  • MEMBER
  • 2 POSTS
I already checked all of the fuses. All of the fuses are good.
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Monday, July 6th, 2020 AT 7:22 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You might want to try the security system. Turn the key to on for about fifteen minutes, then see if it starts. These systems dissable fuel and sometimes the starter. But if the security mod thinks the key is wrong, you wont get PCM reading.
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Monday, July 6th, 2020 AT 7:22 PM (Merged)
Tiny
JOE MCGREGOR
  • MEMBER
  • 6 POSTS
Cigarette lighter fuse may cause the ALDL to not power up the scan tool, also I have found the dash mounted ignition switches to be less than great. Had a customer with no start problem and the Ign. Switch was problem, I've seen this several times.
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Monday, July 6th, 2020 AT 7:22 PM (Merged)

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