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Service Engine Soon

Tiny
SHOEBOY
  • MEMBER
  • 1995 CHEVROLET CAMARO
The car runs nice, But if im driving at 50+mph, then slow down, the Service Engine Soon light comes on, If I stop somewhere, say for coffee & restart the car, the light doesnt come back on, Also, If im just driving short distances, It dosent come on, Kind of intermittent. This started when I ran really low on Gas, The owners manual says that the Service Engine Soon light might come on if you get too low on fuel because it senses a misfire & should reset after a few starts, But it sounded like this only pertained to cars equipped with OBD II, Which this car does not have. Either way Light on or off, the car runs fine. Is this something I need to be concerned about or is this just a trait of this model?
Thanks
Jim
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Monday, February 26th, 2007 AT 6:34 AM

48 Replies

Tiny
LYTN_J
  • MEMBER
  • 19 POSTS
Are there any trouble-codes? This guide can help

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.
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Tuesday, February 27th, 2007 AT 9:43 AM
Tiny
SHOEBOY
  • MEMBER
  • 4 POSTS
I dont know about the trouble codes, My local auto zone said they could only check the codes if I had OBD II, Which I dont have, But I do have a Data Link Terminal, Is this OBD I? & Is it worth me buying a OBD I tester, they are pretty cheap, I guess they blink the #s of the trouble code, I have a Haynes manusl that lists the codes, Just not sure if this is an OBD I terminal, Its just listed in the user manual as a data link terminal.
Thanks for the reply
Jim
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Wednesday, February 28th, 2007 AT 5:28 PM
Tiny
LYTN_J
  • MEMBER
  • 19 POSTS
The 94 and 95 years are crossover years between OBD1 and OBD11. You may have a hybrid system.

How many pins in the data link connector? If there are 12 pins, that should be obd1.

If there are 16 pins, you may have what they call OBD1.5, it's a hybrid system, uses 16 pins but you have to use an OBD1 code reader.

I don't have much info on that hybrid system. I'd hate to see you buy an OBD1 code reader and then it not work on your system. Maybe the store would let you bring it back, if doesn't work? You can ask.

My first thought about your CEL was to check the 02 sensor and circuit. I can't tell you to replace it without doing some tests.
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Thursday, March 1st, 2007 AT 12:40 PM
Tiny
SHOEBOY
  • MEMBER
  • 4 POSTS
Thanks for your help, Its the 16 pin OBD 1.5, Auto Zone wont read it, I might try a dealer or a friend who has a code reader, The service engine light hasent gone on the past day or so, But today, After driving 65+, then slowing to 40- mph it went back on, Also the car idles a bit rough, Im changing the fuel filter as the car has been run to almost empty a couple times, Also changing the PCV valve, hopefully I can get the error codes, it still runs good, never stalls, but it must be something ! Possibly O2 sensor like you said.
Thanks Again for your help & I will make a donation asap, this weeks a little tight though.
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Thursday, March 1st, 2007 AT 7:05 PM
Tiny
SHOEBOY
  • MEMBER
  • 4 POSTS
I finally got The Error Code, Just one came up, EGR Valve ! Actually EGR selonoid #2.
Thanks Again
Jim
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Friday, March 2nd, 2007 AT 3:02 PM
Tiny
MIKEGDEEZ
  • MEMBER
  • 1 POST
I have the same OBD-1.5 system in my '95 Trans Am. How'd you pull the codes? The more specific the better because I'd rather do it myself even if I spend a little $$ on equipment rather than pay the dealer $50 bucks to do it.

Feel free to e-mail me a reply as well since I only found this forum through a google search a few minutes ago! (Mikegdiaz @ gmail. Com)
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Friday, April 18th, 2008 AT 3:57 PM
Tiny
OMAR198569
  • MEMBER
  • 12 POSTS
  • 1995 CHEVROLET CAMARO
  • V8
  • 2WD
  • MANUAL
  • 100,000 MILES
I have a 1995 Camaro which is an OBD 1.5. I Can't seem to find a code reader that will work with my car. I would rather buy a code reader than take it to a shop. So my question is where can I find a code reader that will work with my car.
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Jumper A to B on the ALCL and count the flashes example DTC 12 Flash pause then flash flash it will show two more times before it goes to the next code if any


https://www.2carpros.com/forum/automotive_pictures/12900_GM_ALCL_4.jpg

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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Chevrolet
13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
23 Manifold Air Temperature (MAT) Low Temp Indicated
24 Vehicle Speed Sensor (VSS) Circuit
25 Manifold Air Temperature (MAT) High Temp Indicated
32 Exhaust Gas Recirculation (EGR) Circuit
33 Manifold Absolute Pressure Sensor Circuit (High Sig.)
34 Manifold Absolute Pressure Sensor Circuit (Low Sig.)
35 Idle Air Control (IAC)
41 Cylinder Select Error
42 Ignition Control (IC) Circuit
43 Knock Sensor (KS) Circuit
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
51 EEPROM or ECM Failure
53 System Voltage Overcharge
54 Fuel Pump Circuit (Low Voltage)
55 ECM Error
61 Degraded Oxygen Sensor
62 Transaxle Gear Switch Signal Circuit
63 A/C Refrigerant Pressure Sensor Circuit
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
SHURE234
  • MEMBER
  • 1 POST
  • 1991 CHEVROLET CAMARO
Computer problem
1991 Chevy Camaro V8 Two Wheel Drive Automatic 10000+ miles

i just got done looking at a 91 camaro rs 305 and thinking about buying it but 1 small problem the check engine soon light was on but it is a carb motor could this just b and o2 sensor or sumthin more? And if so cant I just eliminate the o2 sensor and b just fine
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Yes could be 02 sensor why eliminate them won, t matter
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, you engine is not carbureted. It's fuel injected.

Here is a way to get the codes.
These codes are for an 89 but should be the same for 91.

https://www.2carpros.com/images/question_images/199424/original.jpg
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Has someone converted it to carb?
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, I'll bet he's mistaking a TBI for a carb. People do it all the time.
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Ya your prob right lol
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Monday, April 29th, 2019 AT 5:46 PM (Merged)
Tiny
BOB RADCLIFF
  • MEMBER
  • 1 POST
  • 1994 CHEVROLET CAMARO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 119,500 MILES
Service engine light come on when you have been doing 60 / 70 mph on the freeway, and get out of it around 40 mph the serive light come on and stays on till you turn the engine out. Give it about 10 mintines and then start it, it's ok. Change oil, oil filer, air filer, and spark pluge. Service lights still comes on.
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Tuesday, September 24th, 2019 AT 7:22 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Thats typical of egr problem. Check for codes and get back to us. Under drivers side dash is the aldl connector. Use a small piece of wire and jump terminals a@b then turn on key and watch for flashes of the check engine light. Write down the number of flashes then get back to us.
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Tuesday, September 24th, 2019 AT 7:22 PM (Merged)
Tiny
D5NUKE
  • MEMBER
  • 61 POSTS
I have the exact same issue. I thought it was a possible cruise control issue. I jumpered pin A@B but got no codes at all. The check engine light did not flash anything. After about 10 min the light went out when I restarted it. But now I will focus my trouble shooting to the EGR system.
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Tuesday, September 24th, 2019 AT 7:22 PM (Merged)
Tiny
ROBERT HARMON
  • MEMBER
  • 1 POST
  • 1992 CHEVROLET CAMARO
  • V8
  • 2WD
  • AUTOMATIC
  • 212,000 MILES
How do you reset the sevice engine light.
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Tuesday, September 24th, 2019 AT 7:22 PM (Merged)
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
You must first, fix the problem that triggered the light. Then the hook a scanner up to the OBD plug and follow the instructions to reset the light. Autozone or a place like that will do this for free.

However, since this is an OBD 1 vehicle you will have to follow this guide to help pull codes and then erase them. Unfortunately resetting a checking engine light is not going to fix anything so we need to fix the issue first and then we can just clear the codes.

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

Please run through this and let us know if you have other questions.
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Tuesday, September 24th, 2019 AT 7:22 PM (Merged)

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