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Username Post: Run away starter`        (Topic#356578)
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-28-19 01:39 PM - Post#2767241    

The '95 Jimmy has a problem. It will crank on its own draining the battery. I think the problem is in the key switch. Sometimes, you can turn it without the key! Has anyone seen a similar problem?

I'm going out to tomorrow with my Power Probe IV. I can test the starter by powering it at the relay circuit.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-03-19 08:11 AM - Post#2767598    
    In response to gchemist

Ok, I went and changed out the starter in a parking lot. I'm glad I had my 1/2" impact. One bolt was too tight to take off with a short ratchets. Not a bad job. Used a small jack to raise the wheel. Used a 4x4 piece of wood under the wheel. It was enough clearance to get under it. Afterwards, same problem. We went for a new key cylinder. I replaced it fairly quick. Same problem. Apparently, the problem is in the key cylinder housing. If you wiggle it enough, the starter will crank. It will not start since fuel and ignition power is cut. I determined if the wheel is locked and key is out, it will not crank on it's own. If you wiggle it too much, it will try to crank. The new cylinder is tight compared to the old one. A permanent solution may be to replaced the column. Or other another internal column part.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
11-10-19 04:17 AM - Post#2779882    
    In response to gchemist

Update: I tried to bypass all ignition fuses. It would still crank away. I tried to ID the crank relay. Even after unplugging three in the engine bay and two in the glove box, it would still crank. So finally, decided to cut the starter solenoid wire. The starter was burned up from its last crank episode. A local shop sold me a smaller gear reduction starter. It it went in fast and cranks crazy fast. I ran wires into the dash with an off/on switch. It won't crank on it own unless the switch is left in the on position. To start it, the switch must be in the off position. The key is turned to on, flip the switch to on, then key crank to start it. Once it starts, the switch is flipped back to the off position. So far the owner has not called back. I guess it's working good. No more mysterious auto cranks or dead battery.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2852
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
12-30-19 07:17 PM - Post#2783264    
    In response to gchemist

Sounds like a ignition problem. Not the tumbler but the ignition switch.
It could also be a aftermarket remote start unit that is shorted.
If it has it, unplug it and see if the issue disappears

Old School GM fan FOREVER


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
12-31-19 07:21 AM - Post#2783297    
    In response to rockfangd

The problem is in the steering column. Since it's the '95-'96 transition year, it's probably a bad wire somewhere. There are two harnesses available for that year. So far, the bypass has worked. The starter has not run on its own. It did once but the owner left the switch in the on position. He shortened the small torque starter life with the error. The smaller torque starter is working though. After a battery charge and boost, it's working properly with its bypass.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2852
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
12-31-19 08:28 AM - Post#2783301    
    In response to gchemist

There is still a hazard there though.
There is a short that is completing the circuit to the crank wire. If that wire happens to overheat from the short it can cause bigger issues.
I know those years were the first years of that style, The ignition unit should still be in the column.
Does moving the column up or down make a difference?

Old School GM fan FOREVER


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-01-20 09:09 AM - Post#2783403    
    In response to rockfangd

We tried moving the column up and down. Even wiggled all the harness I could reach around the column. It's definitely associated with the key cylinder. We replaced it first and it continued to do it. The metal mechanism where the cylinder inserts must be causing the short. An entire steering column swap may be necessary. Unless, the column parts can be swapped out.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2852
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-02-20 07:16 PM - Post#2783551    
    In response to gchemist

That is the ignition I was talking about.
The part behind the cylinder.
I would highly recommend replacing that.
In seeing things over time I would be concerned about a fire hazard.
Especially with a unknown short on a larger circuit

Old School GM fan FOREVER


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-03-20 06:46 AM - Post#2783594    
    In response to rockfangd

rockfangd,
Have you replaced column parts? Does it need to taken out to replace the cylinder holding mechanism? I'll have look for a diagram to see the associated parts.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2852
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-03-20 06:12 PM - Post#2783634    
    In response to gchemist

I have but it has been awhile.
There should be a linkage that runs from the cylinder to the ignition itself. On ones I have done the cylinder does not have to be removed to replace it.
Does it have airbags? The assumption is yes but 95 was a half breed year and some did not
https://www.rockauto.com/catalog/images/transp urpl...

Old School GM fan FOREVER


Edited by rockfangd on 01-03-20 06:20 PM. Reason for edit: No reason given.

 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-05-20 08:31 AM - Post#2783731    
    In response to rockfangd

rockfangd,
What part number are you trying to show me? The pic link shows a blank page.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2852
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
01-15-20 06:32 PM - Post#2784454    
    In response to gchemist

That one is US275. Standard products.
For with airbags.
Sorry for the delay

Old School GM fan FOREVER


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25014
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-18-20 09:19 AM - Post#2784590    
    In response to rockfangd

No problems. The problem is getting my friend to bring it back to me for repairs. He likes driving it due to his long commutes. The rare 3.08 rear end is great for highway cruising. The Jimmy gets better gas mileage than his 2002 Mazda B2300 I4. The Mazda has only three gears. Reverse, 2nd, and 4th. I don't know why he just will not let it go. It's not safe to drive with only those gears.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




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