Check Engine light - The 1947 - Present Chevrolet & GMC Truck Message Board Network

falvarez12001 · 07-02-2007, 03:41 PM

Can antone help me. I have a 1983 Chevy custom Deluxe with a 305 engine in it 2wd. My check engine light keeps turning on and off. I checked the fluids they look good, It doesn't look like it's overheatting. Anything else I should look at. The only thing wrong with the truck is that after turning the engine off it sputters for a bit before shutting off. Any suggestions?

gchemist · 07-02-2007, 06:08 PM

The check engine light is tied to the choke.

Malo83 · 07-03-2007, 12:56 AM

I have an 83 with the 305 also, these are the trouble codes for the ENGINE LIGHT on our trucks.

#12-No distributor reference pulses to the ECM. normal code with ignition on and engine not running.

#13-Oxygen Sensor Circuit

#14-Shorted Coolant Sensor Circuit

#15-Open Coolant Sensor Circuit

#21-Throttle Position Sensor Circuit

#23-Open or grounded M/C Solenoid Circuit, E4ME Qjet

#34-Vacuum Sensor Circuit

#41-No distributor reference pulses at specified engine vacuum

#42-Electronic Spark Timing (EST)

#44-Lean exhaust indication

#45-Rich exhaust condition

#51-Faulty or improperly installed calibration unit(PROM)

#54-Shorted M/C Solenoid Circuit and/or faulty ECM

#55-Grounded V ref(term21), hush voltage on Oxygen Sensor circuit ECM

All of these trouble codes are stored in the Memory except #12 which will flash while the fault is present.
You might want to have the PROM read and see what trouble code is at fault and causing the light to flash, or try erasing the memory and see if the light still comes on.
to erase the memory remove the ECM fuse in the upper right corner of the fuse panel for 10 seconds.
Good luck

07-02-2007, 03:41 PM	#1
falvarez12001 Registered User Join Date: Sep 2006 Location: San Antonio , TX Posts: 140	Check Engine light Can antone help me. I have a 1983 Chevy custom Deluxe with a 305 engine in it 2wd. My check engine light keeps turning on and off. I checked the fluids they look good, It doesn't look like it's overheatting. Anything else I should look at. The only thing wrong with the truck is that after turning the engine off it sputters for a bit before shutting off. Any suggestions? __________________ Why, Because it's my truck 1972 Chevy Longhorn, Dropped 4-7 1984 Chevy Shortbed custom Deluxe (Daily Driver)

07-02-2007, 06:08 PM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Check Engine light The check engine light is tied to the choke. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

07-03-2007, 12:56 AM	#3
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: Check Engine light I have an 83 with the 305 also, these are the trouble codes for the ENGINE LIGHT on our trucks. #12-No distributor reference pulses to the ECM. normal code with ignition on and engine not running. #13-Oxygen Sensor Circuit #14-Shorted Coolant Sensor Circuit #15-Open Coolant Sensor Circuit #21-Throttle Position Sensor Circuit #23-Open or grounded M/C Solenoid Circuit, E4ME Qjet #34-Vacuum Sensor Circuit #41-No distributor reference pulses at specified engine vacuum #42-Electronic Spark Timing (EST) #44-Lean exhaust indication #45-Rich exhaust condition #51-Faulty or improperly installed calibration unit(PROM) #54-Shorted M/C Solenoid Circuit and/or faulty ECM #55-Grounded V ref(term21), hush voltage on Oxygen Sensor circuit ECM All of these trouble codes are stored in the Memory except #12 which will flash while the fault is present. You might want to have the PROM read and see what trouble code is at fault and causing the light to flash, or try erasing the memory and see if the light still comes on. to erase the memory remove the ECM fuse in the upper right corner of the fuse panel for 10 seconds. Good luck



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