Intake Manifold Install

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Mango

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
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

Full Access Member
Joined
May 27, 2018
Posts
1,211
Reaction score
1,275
Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
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

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
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
 
Last edited:

gmbellew

Full Access Member
Joined
May 27, 2018
Posts
1,211
Reaction score
1,275
Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
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

Full Access Member
Joined
May 27, 2018
Posts
1,211
Reaction score
1,275
Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
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?
 

Attachments

  • Screenshot_20230813_224501_Adobe Acrobat.jpg
    Screenshot_20230813_224501_Adobe Acrobat.jpg
    81.8 KB · Views: 50

Mango

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
In the Process Now
Thanks
 

Mango

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
Need a new Ignition Control Module, Interesting did not have any issues before
 

Mango

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
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

Full Access Member
Joined
May 27, 2018
Posts
1,211
Reaction score
1,275
Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
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

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
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

Full Access Member
Joined
May 13, 2019
Posts
4,428
Reaction score
5,541
Location
Oregon
First Name
Eric
Truck Year
1980
Truck Model
K25
Engine Size
350-4bbl
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

Full Access Member
Joined
Dec 22, 2021
Posts
216
Reaction score
165
Location
JacksonWyoming
First Name
Gil
Truck Year
1989
Truck Model
1500
Engine Size
350
What wire are you talking about?
 

gmbellew

Full Access Member
Joined
May 27, 2018
Posts
1,211
Reaction score
1,275
Location
Kansas city
First Name
glen
Truck Year
1990
Truck Model
suburban 1500
Engine Size
350
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
 
Last edited:

Latest posts

Forum statistics

Threads
43,979
Posts
946,978
Members
36,034
Latest member
gordies78
Top