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Discussion Starter · #1 ·
Had a new clutch and sundries fitted a month ago and all has been fine. Over the weekend (and lots of rain) began getting what sounds like an electrical grating type noise when I start to depress the clutch pedal! Also when changing gear using the clutch the lights flicker as if there is a short? Can you please tell me the name of the switch that engages clutch to enable ignition ? Do they go wrong and if so are the easy to source?

Many thanks


Jamie
 

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2003 Sonoma SLS ext. cab 4.3L / 4x4
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The switch is gerenically called the clutch position switch, neutral safety switch, or the clutch interlock switch. For the '96 S10 2WD/ 2,2L (as listed in your previous posts), it is readily available as OEM and after market (Rock Auto for example). I can't address if they are prone to failure, but like any part, they can fail. However, IIRC the switch is simply an on-off type to provide a safety feature to disable starting a vehicle (potentially in gear) w/o depressing the clutch pedal. So if the truck starts and is able to be shifted, it may be something other than this particular switch. However, it may be possible that the switch is starting to fail and has intermittent 'problems'. The good news is that the part won't break the bank if a replacement is in order!
 

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Discussion Starter · #3 ·
The switch is gerenically called the clutch position switch, neutral safety switch, or the clutch interlock switch. For the '96 S10 2WD/ 2,2L (as listed in your previous posts), it is readily available as OEM and after market (Rock Auto for example). I can't address if they are prone to failure, but like any part, they can fail. However, IIRC the switch is simply an on-off type to provide a safety feature to disable starting a vehicle (potentially in gear) w/o depressing the clutch pedal. So if the truck starts and is able to be shifted, it may be something other than this particular switch. However, it may be possible that the switch is starting to fail and has intermittent 'problems'. The good news is that the part won't break the bank if a replacement is in order!
Thank you very much for the useful information. I am going to take a good look at it over the weekend. I will order one from Rock Auto in case it is faulty. I am amazed how cheap parts are from Rock Auto (even with postage and import tax!)

Thanks again for taking the time to reply.

Jamie
 

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IIRC the switch is simply an on-off type to provide a safety feature to disable starting a vehicle (potentially in gear) w/o depressing the clutch pedal.
Yes......When the clutch pedal is pushed all the way to the floor that switch is active.....however, there is also another electrical switch called "cruise control cancel switch" (something like that) and it is active when the clutch is ever so slightly pressed. This particular cancel switch turns off cruise control so that when the clutch pedal reaches the floor, the engine rpm's don't shoot up.

One clutch pedal, two switches.

And to make matters a little more messy, if the problem is suspected to be with the cruise control cancel switch ......the cruise control electrical circuit is also associated with the brake light switch. 🥺😭

Good luck.
 

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Discussion Starter · #6 ·
Just thought I would give and update on the above issue in the hope someone can help!!!!

The garage took the clutch out again to see if they could find the source of the problem/noise. To cut a long story short they cant nail the issue! He reckons the fly wheel moves when pedal pushed and makes it engage with starter? He fitted the old flywheel but the problem is the same! The only suggestion he had was that the starter needs 'shimming' back further from the flywheel! It seems strange that the starter and flywheel had no problems before the new clutch? Also is it even possible to shim the starter as they fit from the bottom and not the side!
Any help appreciated, need a reliable daily driver so bit concerned!

Thanks for reading
 

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This is a 2.2L? You shouldn't need to shim the starter on it. Did they look at the throwout bearing? That is a common source of noise.
 

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2003 Sonoma SLS ext. cab 4.3L / 4x4
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I don't have any keen insight relative to your clutch issue, but I might recommend that a new garage/ shop may be in order for you. If the "mechanic" thinks the flywheel "moves" when you push the clutch pedal, he ought not to be working on vehicles. Even more troublesome is that he postulates that the 'flywheel' somehow moves enough to engage the starter pinion gear (which retracts/ disengages after you stop cranking the engine; the flywheel is fixed to the end of the crankshaft and does not move fore and aft). Using a 'benefit of the doubt' view, he might be incorrectly calling the pressure plate the flywheel, but he should know the difference. Nomenclature aside, they are distinctly different parts.

And, yes it is possible to shim a bottom mounted starter, but only if a check of the gear tooth engagement pattern warrants a shim (or shims). Shimming a starter 'out' or 'away' from the flywheel would be warranted if things bind, or if there is grinding when trying to start the engine. Generally, you shouldn't need to shim it.

Also, the noise you are hearing might well be the throw out bearing - it can emit a 'grating/ grinding' noise if it is failing or has failed. Did the "mechanic" mention that or even examine the original one? On clutch jobs I've done, I replace the bearing along with all the other components while everything is apart; I consider that SOP.
 

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I'm not familiar with the 2.2 but when I pulled the knocking 4.3 out of my Blazer, the crankshaft did, in fact, move back and forth about 1/8". I haven't disassembled it, but I assume it has a worn thrust surface on the crank or a worn bearing. I'm certainly not saying that's the problem on the OP's engine, but I would assume that a similar problem is possible.
 

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Discussion Starter · #10 ·
This is a 2.2L? You shouldn't need to shim the starter on it. Did they look at the throwout bearing? That is a common source of noise.
I am not sure but being a specialist transmission garage I would have thought so! Is there any chance that it could be electrical? ie the switch? Maybe get it tested? It still seems strange it started a month after new clutch fitted! Yeah it’s a 2.2. Thanks
 

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Is the noise coming from inside the cab? That's the only way it could be electrical that I can fathom. You can always remove the switch and put a jumper wire in the plug to see if the noise goes away. It will start in gear this way so be careful.
 
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