Need your ideas - LT5 won?t turnover - ZR-1 Net Registry Forums

lfalzarano · 02-10-2022

The car has been in a shop for 3 months to repair the clutch hydraulics (master and slave cylinders) and replace the clutch. The battery was replaced last week, but the mechanic says nothing happens when he tries to start it (will not crank). The LT5 had no engine problems even after the transmission failures when I drove it last.

I know they must have moved the ECU when they replaced the clutch master cylinder. I also know that you have to disconnect the clutch pedal to the clutch master cylinder when replacing it.

Suggestion on a possible solution would be appreciated.

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mlipmd · 02-10-2022

Did they disconnect/reconnect the CSS?

lfalzarano · 02-10-2022

What is the CSS?

Young1 · 02-10-2022

Clutch safety switch. Mounted on clutch pedal assembly up under hush panel

viper107 · 02-10-2022

if they can pull a transmission the shurly can figure this out, no differant than any system

tccrab · 02-11-2022

Nothing special about the starter and ignition circuits, same as all other C4s.
It's not rocket surgery, any decent mechanic should know and understand and diagnose them with both eyes shut.
Vats does complicate it somewhat, but thats why theres diagnostic charts in the FSM.
Sounds like you need a new mechanic.

Crabs

Young1 · 02-11-2022

It?s not necessary to move to remove the ECU, you just remove it from its bracket and flip it over out of the way. If they took all the clips out of the back of the eco and put them back in incorrectly that could be your problem. Again not rocket science.

lfalzarano · 02-12-2022

Quote:

Originally Posted by Young1

Clutch safety switch. Mounted on clutch pedal assembly up under hush panel

Thanks but that tested OK according to the mechanic.

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DRM500RUBYZR-1 · 02-12-2022

1- battery voltage 12.5 plus
2- battery connections clean and tight
3- is it making it through the VATS ( were the two white wires in column harmed)
4- make sure a thicker floor mat is not preventing clutch going to floor
5- any deflection of voltage needle when key turned from on to start
6-unplug and replug ECM connectors if they had been removed
7- If ECM was removed, make sure chip is in firmly and correctly.

Marty

Demps · 02-12-2022

Marc Haibeck's site has his tips...I'd reference this: http://www.zr1specialist.com/HAT%20W...20Problems.pdf

Ted

02-10-2022	#1
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Need your ideas - LT5 won?t turnover The car has been in a shop for 3 months to repair the clutch hydraulics (master and slave cylinders) and replace the clutch. The battery was replaced last week, but the mechanic says nothing happens when he tries to start it (will not crank). The LT5 had no engine problems even after the transmission failures when I drove it last. I know they must have moved the ECU when they replaced the clutch master cylinder. I also know that you have to disconnect the clutch pedal to the clutch master cylinder when replacing it. Suggestion on a possible solution would be appreciated. Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] Last edited by lfalzarano; 02-10-2022 at 01:50 PM.

02-10-2022	#2
mlipmd Join Date: Mar 2021 Location: Crawfordville, FL Posts: 201	Re: Need your ideas - LT5 won?t turnover Did they disconnect/reconnect the CSS?

02-10-2022	#3
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: Need your ideas - LT5 won?t turnover What is the CSS? __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]

02-10-2022	#4
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 870	Re: Need your ideas - LT5 won?t turnover Clutch safety switch. Mounted on clutch pedal assembly up under hush panel __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

02-10-2022	#5
viper107 Join Date: Dec 2019 Location: st louis mo Posts: 746	Re: Need your ideas - LT5 won?t turnover if they can pull a transmission the shurly can figure this out, no differant than any system __________________ 95 admiral blue z(sold)/ / 93 ruby z(sold) 91 steel blue z/95 aqua z haibeck 510, 91 callaway 415 areobody #5

02-11-2022	#6
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,643	Re: Need your ideas - LT5 won?t turnover Nothing special about the starter and ignition circuits, same as all other C4s. It's not rocket surgery, any decent mechanic should know and understand and diagnose them with both eyes shut. Vats does complicate it somewhat, but thats why theres diagnostic charts in the FSM. Sounds like you need a new mechanic. Crabs __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

02-12-2022	#9
DRM500RUBYZR-1 Join Date: Sep 2008 Location: Mullica Hill, New Jersey Posts: 2,566	Re: Need your ideas - LT5 won?t turnover 1- battery voltage 12.5 plus 2- battery connections clean and tight 3- is it making it through the VATS ( were the two white wires in column harmed) 4- make sure a thicker floor mat is not preventing clutch going to floor 5- any deflection of voltage needle when key turned from on to start 6-unplug and replug ECM connectors if they had been removed 7- If ECM was removed, make sure chip is in firmly and correctly. Marty

02-12-2022	#10
Demps Join Date: Jan 2006 Location: Niceville Posts: 997	Re: Need your ideas - LT5 won?t turnover Marc Haibeck's site has his tips...I'd reference this: http://www.zr1specialist.com/HAT%20W...20Problems.pdf Ted