Help z28 no crank no start
03-16-2016, 01:58 PM
#1
Registered User
Thread Starter
Join Date: Mar 2016
Posts: 3
Help z28 no crank no start
I need help. My 1994 Z28 LT1 developed a No Crank No Start issue and after a few days it led me to the Neutral Safety Switch.
I finally got it to start by wiggling around on the Manual Shifter and after a few jiggles it would eventually start fine.
This went on for about 5 days now...today however I went out and no matter how much I wiggled, jimmied or slammed it would not crank.
I need my car to get to work and have no other options so I studied some Neutral Safety Switch bypass instructions. I cut the 2 thick wires to the switch and jumped them. And still Nothing.
Someone please help. Did I miss something on the bypass??
Single father who need to get to work. Any help please.
I finally got it to start by wiggling around on the Manual Shifter and after a few jiggles it would eventually start fine.
This went on for about 5 days now...today however I went out and no matter how much I wiggled, jimmied or slammed it would not crank.
I need my car to get to work and have no other options so I studied some Neutral Safety Switch bypass instructions. I cut the 2 thick wires to the switch and jumped them. And still Nothing.
Someone please help. Did I miss something on the bypass??
Single father who need to get to work. Any help please.
03-16-2016, 05:48 PM
#2
Registered User
Thread Starter
Join Date: Mar 2016
Posts: 3
Re: Help z28 no crank no start
I need help. My 1994 Z28 LT1 developed a No Crank No Start issue and after a few days it led me to the Neutral Safety Switch.
I finally got it to start by wiggling around on the Manual Shifter and after a few jiggles it would eventually start fine.
This went on for about 5 days now...today however I went out and no matter how much I wiggled, jimmied or slammed it would not crank.
I need my car to get to work and have no other options so I studied some Neutral Safety Switch bypass instructions. I cut the 2 thick wires to the switch and jumped them. And still Nothing.
Someone please help. Did I miss something on the bypass??
Single father who need to get to work. Any help please.
I finally got it to start by wiggling around on the Manual Shifter and after a few jiggles it would eventually start fine.
This went on for about 5 days now...today however I went out and no matter how much I wiggled, jimmied or slammed it would not crank.
I need my car to get to work and have no other options so I studied some Neutral Safety Switch bypass instructions. I cut the 2 thick wires to the switch and jumped them. And still Nothing.
Someone please help. Did I miss something on the bypass??
Single father who need to get to work. Any help please.
03-16-2016, 06:22 PM
#3
Registered User
Thread Starter
Join Date: Mar 2016
Posts: 3
Re: Help z28 no crank no start
So I pulled the negative cable and the pcm and battery fuses. Computer reset...but still won't start and now my Security light is staying on. Doesn't shut off at any time that the key is in the on position.
03-16-2016, 10:11 PM
#4
Administrator
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,646
Re: Help z28 no crank no start
The neutral safety switch has nothing to do with the PCM.
Were the two wires you jumpered on the switch yellow and brown? The neutral safety switch provides 12 V to the signal side of the theft deterrent relay (TDR). The ground to the signal side of the TDR comes from the theft deterrent module (TDM) after it successfully reads the key resistor. Since the "SECURITY" light is on could be a problem with reading the key, or the TDM.
Lots of components in the circuit that can fail. Check for 12 V on the yellow wire at the neutral safety switch when you turn the key to "start". Then work your way to the TDR, and check other components. Shoebox has the 95 starter circuit and pass-key wiring diagrams in the electrical section of his tech pages. Your 94 will be similar.
shbox.com
Were the two wires you jumpered on the switch yellow and brown? The neutral safety switch provides 12 V to the signal side of the theft deterrent relay (TDR). The ground to the signal side of the TDR comes from the theft deterrent module (TDM) after it successfully reads the key resistor. Since the "SECURITY" light is on could be a problem with reading the key, or the TDM.
Lots of components in the circuit that can fail. Check for 12 V on the yellow wire at the neutral safety switch when you turn the key to "start". Then work your way to the TDR, and check other components. Shoebox has the 95 starter circuit and pass-key wiring diagrams in the electrical section of his tech pages. Your 94 will be similar.
shbox.com
Thread
Thread Starter
Forum
Replies
Last Post
pimpinphil
Computer Diagnostics and Tuning
2
05-30-2015 04:20 PM