Intake Manifold Install

[Mango]

GMBellew
Checked all vac lines correct location most are new
The T in the PCV line is Purge Signal Hose to canister
Checked connections and wires look good
Cleared codes let it idle to temp stalled when it reached Operating Temp
Restarted it no engine light, idle was fine then idle dropped very low check engine light came on did not stall yet
shut it down will try another day
Thanks for your assistance

 

[gmbellew]

GMBellew
Checked all vac lines correct location most are new
The T in the PCV line is Purge Signal Hose to canister
Checked connections and wires look good
Cleared codes let it idle to temp stalled when it reached Operating Temp
Restarted it no engine light, idle was fine then idle dropped very low check engine light came on did not stall yet
shut it down will try another day
Thanks for your assistance

is it still code 42? because if it only does it at operating temp (likely when it hits closed loop), it makes me think it may not be ignition related.

 

[Mango]

Yes still Code 42 going to check the wires to the ECM next
The intake ports for the EGR were plugged used the old EGR could this be a issue

 

[gmbellew]

Yes still Code 42 going to check the wires to the ECM next
The intake ports for the EGR were plugged used the old EGR could this be a issue

I don't think plugged EGR will result in 42. it will eventually throw a code when it self tests at highway cruise. but I think it is 32

 

[gmbellew]

if it wasn't doing it before you replaced the manifold, and is new after, it is likely something that got touched somehow. I'd guess the issue to be in the ICM harness in the EST wire or one of the 2 reference wires. the issue could be in the wire or the connectors themselves. did you go through this diagnostic for the code 42?

 

[Mango]

In the Process Now
Thanks

 

[Mango]

Need a new Ignition Control Module, Interesting did not have any issues before

 

[Rusty Nail]

Fixin 40 year old trucks over the internet sure is fun!

 

[gmbellew]

Need a new Ignition Control Module, Interesting did not have any issues before

make sure it is an AC Delco.

it's a common failure point and I carry a couple spares in the truck at all times...

 

[Mango]

AC Delco from Napa will be here Wed
cheep ones die from the heat what do you put under the ICM, what it comes with or something better

Thank You

 

[gmbellew]

AC Delco from Napa will be here Wed
cheep ones die from the heat what do you put under the ICM, what it comes with or something better

Thank You

I've used the paste it comes with normally. no issues with early failure of AC Delco

 

[Mango]

Update Replaced the ICM, New Rotor, The Distrubuter Cap Coil Connection was loose, installed a new one attached all the plug wires in the correct location Went for a test drive ran great! Back to shop tested timing Was spot on, Cleared the code 42, Started right up, Let it Idle for a bit. Shut it down. Came back to shop 45 min later started right backed out of the shop Moved about 50 feet and engine light back on Dam Code 42, Any thoughts
Idiling now and not stalling, Yet I guess that is sonewhat of improvement

 

[Bextreme04]

Update Replaced the ICM, New Rotor, The Distrubuter Cap Coil Connection was loose, installed a new one attached all the plug wires in the correct location Went for a test drive ran great! Back to shop tested timing Was spot on, Cleared the code 42, Started right up, Let it Idle for a bit. Shut it down. Came back to shop 45 min later started right backed out of the shop Moved about 50 feet and engine light back on Dam Code 42, Any thoughts
Idiling now and not stalling, Yet I guess that is sonewhat of improvement

You have a loose wire or a bad connection somewhere. Trace that wire and test with a mutimeter to make sure you have less than 2 ohms of resistance throughout the entire wire run.

 

[Mango]

What wire are you talking about?

 

[gmbellew]

You have a loose wire or a bad connection somewhere. Trace that wire and test with a mutimeter to make sure you have less than 2 ohms of resistance throughout the entire wire run.

yes, has to be an issue in EST or the 2 reference wires from ICM. that's the only things that will set code 42. could also be a problem at the connector plug at the ICM or the EST wire.

Diagnostics in post #65