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Possible ignition problem

Tiny
BOS1957
  • MEMBER
  • 1997 CHEVROLET S-10
  • 4.3L
  • 2WD
  • MANUAL
  • 169,000 MILES
Truck cranks then starts for a brief second and shuts off. I have had problem lately when I hit a large pothole or bump and the blower motor and radio go out and the anti-lock and airbag light come. Move the key a little and the lights go off. It seems that the ignition or fuel pump shut down in the run mode of the switch but I believe the other systems have power. Ever heard of such a problem?
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Monday, April 15th, 2019 AT 6:11 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would start by checking connections. It sounds like maybe your ignition switch may be the issue but check the connector to be sure it is not loose.

Roy
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Monday, April 15th, 2019 AT 6:57 AM
Tiny
BOS1957
  • MEMBER
  • 23 POSTS
That was going to be my next thing to check. Question is the fuel pump test connector under the hood live with the key on, or used to power the pump?
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Monday, April 15th, 2019 AT 7:43 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is used to power the pump by applying battery voltage to the connector. It is a direct bypass to the fuel pump.

Roy
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Monday, April 15th, 2019 AT 7:47 AM
Tiny
BOS1957
  • MEMBER
  • 23 POSTS
Thank's Roy none of the diagrams mention it. The other thing I forgot to mention is if I move the key back just a little bit when it was running the lights went out and the radio and blower motor came back on!
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Monday, April 15th, 2019 AT 8:03 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is the switch itself that is the issue.

Roy

Tools Required:
- J 41352 Modular Column Holding Fixture
- Or Equivalent

REMOVAL
Remove or disconnect the following:
1. Do steps 1 through 7, Refer to Shroud and Lock Cylinder Set Replacement.
2. Do steps 2 through 6, Refer to Turn Signal & Multifunction switch.

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3. Alarm switch from lock module assembly (15).
- Gently pry retaining clip on alarm switch with small blade screwdriver.
- Rotate alarm switch 1/4 turn and remove.
4. Two tapping screws (18).

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5. Ignition & key alarm switch assembly (19).
- Wire harness from slot in steering column housing assembly (26).

INSTALLATION

CAUTION: Always use the correct fastener In the proper location. When you replace a fastener, use ONLY the exact part number for that application. The manufacturer will call out those fasteners that require a replacement after removal. The manufacturer will also call out the fasteners that require thread lockers or thread sealant. UNLESS OTHERWISE SPECIFIED, do not use supplemental coatings (paints, greases, or other corrosion Inhibitors) on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener torque and joint clamping force, and may damage the fastener. When you install fasteners, use the correct tightening sequence and specifications. Following these instructions can help you avoid damage to parts and systems.

Install or connect the following:
1. Ignition & key alarm switch assembly (19).
- Route wire harness through slot in steering column housing assembly (26). Secure wire harness with a wire harness strap (22) through hole located in the bottom of housing assembly (26).
2. Two tapping screws (18). Tighten (18) to 1.4 Nm (12 lb in).
3. Alarm switch to lock module assembly (15).
A. Switch with retaining clip parallel to lock cylinder (17)
b. Rotate switch 1/4 turn until locked into place.
4. Do steps 3 through 8, Refer to Turn Signal & Multifunction switch.
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Monday, April 15th, 2019 AT 8:19 AM
Tiny
BOS1957
  • MEMBER
  • 23 POSTS
Believe it or not Roy, but I undid the switch from the after what a day for the e4 socket for the two screws holding the switch on tested the fuel from battery to the test connector didn't hear the pump, so I held the switch in turned the key and it fired right up an ran until I shut it off without it shutting off like it did before.I had tried starting it earlier today and no start. I am wondering if it's a bad connection where the wires go into the switch?" Going to try moving the switch around while it's running to see what happens.I will let you know how I make out, appreciate you help, you guy's are great.
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Monday, April 15th, 2019 AT 2:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yep, it could be a bad connection.

Let it run and do a wiggle test. That is where you grab a different harness and move them around and see if it causes the engine to shut off.

Roy
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Monday, April 15th, 2019 AT 3:16 PM
Tiny
BOS1957
  • MEMBER
  • 23 POSTS
That was my next plan but I am outside and it's raining on and off all day. So I am going to do it tomorrow (i hate stuff like this!) Thanks
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Monday, April 15th, 2019 AT 5:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
LOL.

You are welcome.

Always glad to help.

Roy
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Monday, April 15th, 2019 AT 5:59 PM

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