P0171 P0174 codes on 3.0 Vue

[IMkenNY]

Would anyone happen to know what TSB:

02-06-01-016A MAR 03 Engine - MIL ON/DTC's P0171/P0174 Set

says about these 2 codes being set? I suspect it might be the MAF but perhaps the TSB might lead me to look at something else.

[IMkenNY]

Here is some additional info on that TSB im looking for:

Service Bulletin Num : 020601016A
Date of Bulletin: MAR 01, 2003
NHTSA Item Number: 10001540

[ssicarman]

Here is the TSB. Please note the VIN break in the TSB and the year range. If you don't fall in that range then if you are getting those two codes you have a different problem. If still in warranty it will be repaired by Saturn.



(MIL) Service Engine Soon Telltale Illuminated With DTCs P0171 and/or P0174 (Retorque Intake Manifold Vacuum Chamber Bolts, Install Vacuum Chamber Springs) #02-06-01-016A - (Mar 24, 2003)


(MIL) SERVICE ENGINE SOON Telltale Illuminated With DTCs P0171 and/or P0174 (Retorque Intake Manifold Vacuum Chamber Bolts, Install Vacuum Chamber Springs)
2002-2003 Saturn VUE -- Built Up To and Including VIN Breakpoint 3S854417

with 3.0L, V6 Engine (VIN R -- RPO L81)

Technician

This bulletin is being revised due to a change in Parts Requirements. Please discard bulletin 02-T-28 (Corporate Bulletin Number 02-06-01-016 , Section 06 -- Engine).

Condition
Some customers may comment on the (MIL) SERVICE ENGINE SOON telltale being illuminated. (DTC(s) P0171 - Fuel Trim System Lean Bank 1 and/or DTC P0174 - Fuel Trim System Lean Bank 2 may be set and stored in the ECM memory.)

Cause
This condition may be caused by insufficient torque on the intake manifold vacuum chamber bolts. Under deceleration, enough vacuum can be created inside the intake manifold to lift the vacuum chamber off it's seal creating an intermittent vacuum leak.

Correction
Refer to the service procedure in this bulletin to retorque the intake manifold vacuum chamber bolts and install the vacuum chamber springs.

Procedure:
Notice: When servicing intake manifold, do not use power tools. Damage to threads or manifold may occur.

Loosen clamp at air cleaner assembly and throttle body assembly.
Remove attachment bolts from outlet resonator/duct assembly.

Remove outlet resonator/duct assembly.

Remove outlet resonator/duct assembly bracket from manifold.

Remove 16 (10 around outside, 6 on inside) intake manifold top cover bolts and cover.
Remove vacuum chamber and apply Loctite™ 242, P/N 21485277 (in Canada, P/N 12345382), or equivalent, to the bolts and reinstall.

Torque vacuum chamber bolts according to torque sequence shown.

Torque
2.5 N·m(22 in-lbs).

Install vacuum chamber springs, P/N 93175463, on vacuum chamber as shown.
Ensure sleeve seals are in position on manifold top cover and install cover into position.
Apply Loctite™ 242, P/N 21485277 (in Canada, P/N 12345382), or equivalent, to all 16 top cover bolts and hand start.

Torque 10 bolts around outside of cover as shown.

Torque
10 Outside Intake Manifold To Cover-to-Manifold Bolts 4 N·m(35 in-lbs).


Torque 6 bolts on inside of cover as shown.

Torque
6 Inside Intake Manifold Top Cover-to-Manifold Bolts: 4.4 N·m39 (in-lbs).

Install outlet resonator/duct assembly bracket to intake manifold.

Torque
Outlet Resonator/Duct Assembly Bracket-to-Intake Manifold Nuts: 5 N·m(44 in-lbs).

Install outlet resonator/duct assembly into position.
Tighten clamp at throttle body assembly
Position outlet resonator/duct assembly to support bracket and install bolts.

Torque
Outlet Resonator/Duct Assembly-to-Support Bracket Bolts: 10 N·m (89 in-lbs).

Tighten clamp at air cleaner assembly.
Verify Repair as follows:
- Connect Scan Tool to the vehicle.

- Navigate to the 3.0L (VIN B) menu.

- Select DIAGNOSTIC TROUBLE CODES (DTC).

- Select CLEAR DTC INFORMATION, this will zero the short and long term fuel trim information.

- Navigate to the Powertrain Menu and Select DATA DISPLAY.

- Select ENGINE DATA DISPLA.

- Select FUEL AND EMISSIONS.

Monitor the following data:
- Short Term FT Bank 1

- Short Term FT Bank 2

Start the engine, the Short Term FT will remain at 0% until the vehicle enters closed loop operation (approximately 5 seconds). Does the Short Term FT Bank 1 or 2 exceed 5% during the first 10 seconds of closed loop operation? (After 10 seconds, the Short Term FT readings can be affected by EVAP canister purge vapors).
- If yes, there is still a lean condition present, refer to DIAGNOSTIC AIDS for P0171/P0174 in the 2002-2003 VUE Powertrain Electrical Diagnostics Service Manual.

- If no, vehicle is repaired.

[mohremail]

I'm a day away from doing this repair, (springs come in tomorrow) I noticed after reading it very carefully that the intake bolts only get torqued to 22 in-lbs. That's only 1.8 ft-lbs. That seems very weak, my torque wrench starts at 10 ft-lbs. Is this a typo, or do I need to find other means of accurately barely tightening these bolts (after applying loctite of-course)?

Any input is greatly appreciated, especially if you did this repair, what did you do it at?

Thank You
Mike

Mohremail@yahoo.com

[fdryer]

There are torque numbers in the in.-lb range as not everything requires gorilla tight asembly techniques. In.-lb torque wrenches exist, just Google. When you consider that you're working on the intake side of things, this side is the induction side - no 200psi compression ratios to worry about like in a cylinder head requiring not only high torque numbers but tightening in a pattern to distribute the tightening forces evenly around a large area.