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Service engine soon light is on

Tiny
COOLJAY
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 144,562 MILES
How do I turn off the Service Engine Soon Light?
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Wednesday, April 14th, 2021 AT 7:12 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When the light comes On it means the computer has identified a problem within the engine management system, what you need to do is follow this guide for OBD 2 code/s-This is your starting point to find out what's causing the light to come On.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.
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Wednesday, April 14th, 2021 AT 7:12 PM (Merged)
Tiny
MOSTERMAN
  • MEMBER
  • 3 POSTS
  • 1994 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
The truck will start and run fine with the service engine soon light on for several minutes. When the light goes off the truck will run rough and will not accelerate and then eventually dies. It will not even try to start unless you hold the throttle wide open but it will not stay running. You can let it sit for several days and then it will repeat the problem. Compression is good, timing is good, spark is good, fuel pressure is good.
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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, check for trouble codes, if you haven't already? You should be able to get some mil codes, by using a jumper wire on the A & B terminals of data link connector. Turn the key till dash lites come on, no further. The mil start flashing, you count the flashes to get the codes. Your looking for two digit codes. Below is a generic GM datalink connector.


https://www.2carpros.com/forum/automotive_pictures/170934_obd_1_datalink_connector_7.jpg

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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)
Tiny
MOSTERMAN
  • MEMBER
  • 3 POSTS
I have checked for the codes but there not any stored. Only code 12 comes up which is a normal run condition. The original problem was the truck would turn over but not start. I had spark so I pushed the gas pedal to the floor and it started. It would idle but as soon as I hit the gas it would die. The problem got worse to where it would not start at all unless it sat for a couple of days. Not sure if the ECM could be giving me this problem.
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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If haven't already, use a gage and check fuel pressure. Some of the national brand autostore used to loan out a fuel pressure gage, if you don't have one.
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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)
Tiny
MOSTERMAN
  • MEMBER
  • 3 POSTS
I have already checked the fuel pressure and it was good.
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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What was the fuel pressure spec? Maybe a computer issue. Use a scanner, look at live engine data. See if anthing is out of the norm.
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Wednesday, April 14th, 2021 AT 7:13 PM (Merged)

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