Need your ideas - LT5 won?t turnover

[Mikey]

3 months??

Innovation Performance Technologies in Aberdeen, NC (near Pinehurst) is owned by a friend of mine.. might want to have them do future work. They're not LT5 gurus but anything else C4 is pretty much all the same and they are very competent. Ask for Jon or Crimson and tell them I sent you.

[tf95ZR1]

Keeping it simple (KISS) are they depressing
the clutch pedal all the way to the floor?

[richarde]

It sounds as though the problem is linked to the Clutch Safety Switch, in particular the Clutch Neutral Start Switch Rod. As it can be difficult to bleed all the air from the clutch hydraulics after replacing both the master and slave cylinders, an over aggressive use of the clutch pedal (repeatedly side slipping it when fully depressed in an attempt to rid the system of air) can sometimes break / disengage the switch rod. This would lead the no start situation described. The part number of the Switch Rod is 14080260.

[-=Jeff=-]

Have you tried to unplug the clutch safety switch put a jumper across the terminals and try to start it? Also you can add a relay (in an older post here) that will use all the switches to power the relay then the relay runs from battery directly to the starter.

It is also possible the starter contacts are carbon covered but I think it is the CSS and related circuit

[lfalzarano]

Update, the mechanic did test the clutch safety switch Feb 4 and tested OK. He retested it again on the Feb. 21 and had to replace it. It starts fine now!

Thanks for all your suggestions and ideas. The mechanic at Chevy is questionable.

When I went to pick it up shifting was laborious and the clutch didn?t engage until an inch from the firewall. (This all started with the clutch hydraulics going out and shattered the clutch, which was the original repair request to the dealer!)

Add to that the idle wouldn?t come down below 2000rpm. It was impossible to drive with both conditions.

So it remains in the shop. [emoji20] we?re approaching the 4 month anniversary of no ZR-1[emoji35]


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[richarde]

So, the clutch pedal needs to be depressed to the floor before disengaging. A few suggestions spring to mind.
The most obvious one is whether the clutch hydraulics have been successfully bled to rid all air from the system.
Another visual check - both the clutch and brake pedal should be very close to being the same height from the floor when looking into the car. If the clutch pedal is appreciably lower than the brake pedal, the problem could be that the full stroke of the clutch master cylinder is not being obtained. If you find this to be the case, the reason could be a bent clutch pedal bracket or pushrod, or even an incorrect specification master cylinder. Having a new clutch with lots of meat on the centre plate can exaggerate this issue.
If the above checks out OK, moving to the clutch slave cylinder, ensure that it is of the correct specification for both bore size and stroke.




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[lfalzarano]

Originally Posted by richarde

So, the clutch pedal needs to be depressed to the floor before disengaging. A few suggestions spring to mind.
The most obvious one is whether the clutch hydraulics have been successfully bled to rid all air from the system.
Another visual check - both the clutch and brake pedal should be very close to being the same height from the floor when looking into the car. If the clutch pedal is appreciably lower than the brake pedal, the problem could be that the full stroke of the clutch master cylinder is not being obtained. If you find this to be the case, the reason could be a bent clutch pedal bracket or pushrod, or even an incorrect specification master cylinder. Having a new clutch with lots of meat on the centre plate can exaggerate this issue.
If the above checks out OK, moving to the clutch slave cylinder, ensure that it is of the correct specification for both bore size and stroke.




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Thanks for your ideas. I?ve been forwarding your comments to the Chevy service manager.


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[lfalzarano]

Another mystery is why an apostrophe being replaced by with a ? mark on this forum?[emoji16]


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[A26B]

A bent clutch fork can also cause a low pedal disengagement. Bent and broken clutch forks are an infrequent but known occurrence in the ZR-1.

Lets see an apostrophe '', and a Question mark???
Showed up fine from my keyboard

[secondchance]

Originally Posted by A26B

A bent clutch fork can also cause a low pedal disengagement. Bent and broken clutch forks are an infrequent but known occurrence in the ZR-1.

Lets see an apostrophe '', and a Question mark???
Showed up fine from my keyboard

Bent clutch fork happened to me about 10 years ago. Apostrophe being replaced with question mark happens when I use iPad for posting.