LT2 Intake Manifold issue

M_2SS · 03-15-2021, 02:23 PM

Hello everyone,

I installed the LT2 intake manifold over the weekend and when I tried to start my car, the idle is very rough. I also received 4 codes on my scan gauge.

P0106 (Manifold Air Pressure (MAP) Barometric Pressure Sensor Electric Circuit Output Range and Performance Problem)

P0107 (Manifold Air Pressure (MAP) Barometric Pressure Sensor Circuit Low Voltage Input Problem)

P0017 (rankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)

P1611 (Main Relay Low Voltage)

I have two theories but wanted to see what everyone thought:

1. Since I had to fab up my own PCV line on the driver’s side due to the manifold being taller and having a barb angled upwards, is it possible that the line has a leak in it and is causing an issue?

2. I had to order an ICT Billet MAP extension harness from GPI since the LT2 intake manifold places the MAP sensor on the passenger side. Could it be an issue with the new extension harness?

Any help or guidance would be greatly appreciated. Thank you.

m6-lt1 · 03-15-2021, 03:42 PM

You have a vacuum leak. Double check your work. This has been a common theme on lt2 swaps. I would start my making sure all the manifold bolts are tightened down

Timbo-1LE · 03-15-2021, 06:51 PM

You need a good torque wrench with Newton meters... Two passes, I used stock lt1 figures 5 nm and then 10 in specific criss-cross pattern. Did it this weekend, go very slow and it will correct your issues.

M_2SS · 03-15-2021, 07:20 PM

Hey guys. Ended up torquing down bolts again and checking the MAP sensor and PCV hose. Looks like the manifold may not have been sitting flush! Thank you for all the help!

ApollosChevy · 06-01-2022, 12:20 PM

do you happen to know the correct sequence? if there is a diagram that would be helpful

ctrlz · 06-02-2022, 10:03 AM

You may also need to change the PCV fitting on the manifold to one angled at 45 or 90 degrees. The hose can get compressed when the hood closes.

03-15-2021, 02:23 PM	#1
M_2SS Drives: 2016 Camaro 2SS Join Date: Dec 2017 Location: New York Posts: 37	LT2 Intake Manifold issue Hello everyone, I installed the LT2 intake manifold over the weekend and when I tried to start my car, the idle is very rough. I also received 4 codes on my scan gauge. P0106 (Manifold Air Pressure (MAP) Barometric Pressure Sensor Electric Circuit Output Range and Performance Problem) P0107 (Manifold Air Pressure (MAP) Barometric Pressure Sensor Circuit Low Voltage Input Problem) P0017 (rankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B) P1611 (Main Relay Low Voltage) I have two theories but wanted to see what everyone thought: 1. Since I had to fab up my own PCV line on the driver’s side due to the manifold being taller and having a barb angled upwards, is it possible that the line has a leak in it and is causing an issue? 2. I had to order an ICT Billet MAP extension harness from GPI since the LT2 intake manifold places the MAP sensor on the passenger side. Could it be an issue with the new extension harness? Any help or guidance would be greatly appreciated. Thank you.

03-15-2021, 06:51 PM	#3
Timbo-1LE Drives: 2017 SS 1LE Join Date: Mar 2017 Location: Florida Posts: 617	You need a good torque wrench with Newton meters... Two passes, I used stock lt1 figures 5 nm and then 10 in specific criss-cross pattern. Did it this weekend, go very slow and it will correct your issues. Last edited by Timbo-1LE; 03-15-2021 at 07:01 PM.

03-15-2021, 03:42 PM	#2
m6-lt1 Drives: 2023 Chevrolet Camaro 2SS 1LE Join Date: Jan 2020 Location: Pennsylvania Posts: 1,033	You have a vacuum leak. Double check your work. This has been a common theme on lt2 swaps. I would start my making sure all the manifold bolts are tightened down

03-15-2021, 07:20 PM	#4
M_2SS Drives: 2016 Camaro 2SS Join Date: Dec 2017 Location: New York Posts: 37	Hey guys. Ended up torquing down bolts again and checking the MAP sensor and PCV hose. Looks like the manifold may not have been sitting flush! Thank you for all the help!

06-01-2022, 12:20 PM	#5
ApollosChevy Drives: 2021 Camaro LT1 A10 Join Date: May 2022 Location: Macomb, Michigan Posts: 16	do you happen to know the correct sequence? if there is a diagram that would be helpful

06-02-2022, 10:03 AM	#6
ctrlz Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016 Location: Ocean City, NJ Posts: 3,177	You may also need to change the PCV fitting on the manifold to one angled at 45 or 90 degrees. The hose can get compressed when the hood closes.

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