2000 Saturn LS2 shuts off at red lights

TERRACH145

MEMBER
2000 SATURN

I have a 2000 Saturn LS2 with about 60,000 miles on it. This car runs great but when you stop at a light for the engine just shuts off (not everytime). It usually starts right up after, but sometimes it takes a little while. When the engine shuts off it does not shutter or give you any indication that it is about to do so. The car was brought in for this problem and we had a variety of things done to it for maitance at that time but the Air Mass Flow filter (i think is what it is called) was what was replaced for this problem. The very next day the problem came back. We brought it back to the garage. But we were told after they had the car for a day that there was nothing wrong. Again the following day it happened again. Now the mechanic has had our vechile for 3 full working days. But they said they are cannot find anything wrong. We really need to be able to get this vechile back on the road. Can anyone help?

4 Replies

PEPPERMRJ

MECHANIC
1,158 POSTS

Welcome to the forum. Electrical problems are a PITA. Two things come to mind, a failing crankshaft position sensor or the main underhood relay. There was a TSB out on the latter. If I find it I'll post it.

Good luck :) and let us know what happens.

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Sunday, February 19th, 2006 AT 7:29 PM

PEPPERMRJ

MECHANIC
1,158 POSTS

2000 Saturn LS2 V6-3.0L VIN R

Top - Vehicle
Technical Service Bulletins
. All Technical Service Bulletins
.. Engine - Intermittent Crank No Start/Multiple DTC's

.

Notes

Engine - Intermittent Crank No Start/Multiple DTC's

BULLETIN NO: 00-T-28

ISSUE DATE: May, 2000

CATEGORY TYPE: Engine-10

CATEGORY: Starting/Charging

CORPORATION NO: 00-06-03-002

SUBJECT:
Intermittent Crank No Start with DTC P1780 Set in ECM History and/or U2105
Set in TCM or BCM History (Replace Main V6 Relay in Underhood Fuse Block [UHFB])

MODELS AFFECTED:
All 2000 L-Series Sedans and Wagons built before VIN YY630765 equipped with V6 (RPO L81) engines

CONDITION:
Some customers may comment the engine intermittently cranks but will not start and Service Engine Soon telltale is illuminated.

CAUSE:
The Main V6 Relay in the underhood fuse block (UHFB) intermittently may not function as designed.

CORRECTION:
Replace the Main V6 Relay using the following procedure.

PROCEDURE:

1. Disconnect negative battery cable.

2. Remove underhood fuse block (UHFB) cover.

3. Remove Main V6 Relay.

4. Install Main V6 Relay (P/N 12135170)

5. Install UHFB cover.

6. Connect negative battery cable.

Torque:
Battery Terminal Bolt: 17 N.M (13 ft-lbs)

PARTS REQUIREMENTS:
12135170 - Relay Asm-Acsry

Hope this helps.

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Sunday, February 19th, 2006 AT 7:41 PM

TERRACH145

MEMBER
3 POSTS

I appreciate your insight. I'll let you know what happens. Hopefully it will be soon!

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Monday, February 20th, 2006 AT 2:24 PM

TERRACH145

MEMBER
3 POSTS

I appreciate your help so much! It was the crank shaft position sensor. Our mechanic checked our car out for 5 days and could not figure it out. But thankfully do to your insight we are on the road again. I guess we should probably find a new mechanic:)

Thanks Again

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Wednesday, February 22nd, 2006 AT 1:32 PM