ALDL / ECM Location

Status
Not open for further replies.

78MC

n00b
Jan 12, 2023
4
0
1
32
I got a 1978 Monte Carlo 2bbl 305.
Check engine light has been on & losing power when turning. Cannot seem to find the ALDL or ECM to retrieve code. In need of some guidance my friends
 

Attachments

  • image.jpg
    image.jpg
    685.8 KB · Views: 111
  • image.jpg
    image.jpg
    729.6 KB · Views: 110
No Check Engine light or even computer in a '78 Monte Carlo. Only warning lights are as following for a 305 2bbl car:
Warning light only, Oil, Temp, Volt/Battery in the middle with the fuel gauge & Bright, Brake, Fasten Seatbelt on the side stack.
Gauge dash, only Bright, Brake, Fasten Seatbelt on the side stack.
 
  • Like
Reactions: 2 users
78 G bodies would not have had computers yet. 1980 was the first year for computer control and only in Cali, 1981 for the rest of the US.
 
  • Like
Reactions: 1 user
Could it be getting confused for the oil/choke light? Little oil can symbol maybe, or, at least it's what it looks like on an 83 gbody I've got here.

Or, could someone have swapped a later gauge cluster into it and have gotten a check engine symbol on the plastic printed slip in the housing, and thus, maybe illuminating something else?
 
  • Like
Reactions: 1 user
Could it be getting confused for the oil/choke light? Little oil can symbol maybe, or, at least it's what it looks like on an 83 gbody I've got here.

Or, could someone have swapped a later gauge cluster into it and have gotten a check engine symbol on the plastic printed slip in the housing, and thus, maybe illuminating something else?
Check it out, all original from what I know
 

Attachments

  • 75CA8A15-2A13-48D5-99B1-1E0AD105A594.jpeg
    75CA8A15-2A13-48D5-99B1-1E0AD105A594.jpeg
    532.2 KB · Views: 94
No Check Engine light or even computer in a '78 Monte Carlo. Only warning lights are as following for a 305 2bbl car:
Warning light only, Oil, Temp, Volt/Battery in the middle with the fuel gauge & Bright, Brake, Fasten Seatbelt on the side stack.
Gauge dash, only Bright, Brake, Fasten Seatbelt on the side stack.
Check this out
 

Attachments

  • FFC69796-2C00-4046-BC36-5AF82E3D3947.jpeg
    FFC69796-2C00-4046-BC36-5AF82E3D3947.jpeg
    532.2 KB · Views: 90
Likely it is the oil pressure warning light. There is a Tan wire under the distributor plugged into the oil pressure sending unit. Take that wire off and ground it and see if that light comes on. If so it is oil pressure warning if not I have no idea what it is.

If it is oil and it comes on during turns the engine oil is low or there is some kind of problem in the oiling system.
 
Check it out, all original from what I know
I'm going to stand by my original guess of oil/choke light. Also, later clusters use the same layout, just renaming the pods:
20221213_130859.jpg
 
Someone has altered the cluster. Notice the lack of pictogram on your "engine" light. Compare to this pic from the 1978 Monte Carlo sale brochure

montedash.jpg
 
Status
Not open for further replies.

GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.

Please support GBodyForum Sponsors

Classic Truck Consoles Dixie Restoration Depot UMI Performance

Contact [email protected] for info on becoming a sponsor