diagnosis connector

[bedwards]

Hi guys, new to Chevy trucks new to forum. Just bought an 85 Silverado with 305. Very low mileage but has been sitting for years. Owner says cranked and drove at least once a month.
Driving home seemed like it wouldn't take smooth acceleration. It either cruised ok or you had to floor it to go. Easy acceleration acted like running out of gas. NO CEL the whole time.
Put Seafoam in it to get home and ran about 3/4 tank out of it. Found cracked vacuum line on spark advance and on a sensor on the firewall. Tightened the top carb screws that have gotten loose. Put fresh gas in it and is running better.
Wanted to pull DTC codes and can't find the connector. Most pictures on the internet show it under dash drivers side. Have looked all under and behind dash and even with flashlight and mirror I can't find the connector.
Any ideas where it might be hidden or are they all supposed to be in the same place?

much thanks
bedwards

 

[77 K20]

I could be wrong... but I didn't think the ALDL connector existed on GM trucks till 1987. I had a 1986 GMC Jimmy and it didn't have one. My dad's 1987 Blazer did though.

If you did have one it would be above your feet/bottom of steering column area.

 

[bedwards]

ok, good, it was driving me nuts trying to find one.

thanks

 

[smoothandlow84]

My 87 has one...lower left side of steering column, tucked just underneath the metal edge of the lower dash by the parking brake release.

 

[RetroC10Sport]

Some diesels and certain carb trucks had them.

Does the CEL come on when you turn the key to on? If not, then no ECM.

 

[bedwards]

no light, just at choke light and the brake light

 

[RetroC10Sport]

Then no ECM.