'90 wouldn't start - Page 3 - ZR-1 Net Registry Forums

rjb48 · 10-11-2007

What is the minimum voltage required? My voltage is measuring 11.6 at the the ALDL using a scan tool. Car will not crank with a jump.

tccrab · 10-11-2007

Something weird going on here...
Apparently RJB48 just posted something to this thread because I just received an email notice, but his post does not seem to be here...

The INTERESTING thing is that his post shows up in the Topic Review which shows up just below the "Reply To Thread" box when I'm typing up this reply.

OK, now it decides to show up.

Oops.
My Bad...

Just because the ALDL reports 11.6 does not mean that is what the starter solenoid is seeing. Your problem could still be under the dash.
Have you jumpered out the Clutch safety switch?
Checked the Starter Relay?
What year is your Z?
(Fill out your user profile)
Has the engine ever been washed with water?
GM knew that the early years (90-92) were having occasional problems with the starter so in '93 they redesigned the start circuit.

Not surprising that jumping didn't do anything. If it's the "DNS" then jumping won't help. Same story if it's a bad starter/solenoid.
The trick here is to diagnose the fault without having to pull the plenum.

DaveK · 10-11-2007

Quote:

Originally Posted by tccrab

OK, now it decides to show up.

Oops.
My Bad...

No, I saw exactly the same thing too - wierd...

10-11-2007	#21
rjb48 Join Date: Oct 2005 Location: Birmingham,AL Posts: 17	Re: '90 wouldn't start What is the minimum voltage required? My voltage is measuring 11.6 at the the ALDL using a scan tool. Car will not crank with a jump.

10-11-2007	#22
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,657	Re: '90 wouldn't start Something weird going on here... Apparently RJB48 just posted something to this thread because I just received an email notice, but his post does not seem to be here... The INTERESTING thing is that his post shows up in the Topic Review which shows up just below the "Reply To Thread" box when I'm typing up this reply. OK, now it decides to show up. Oops. My Bad... Just because the ALDL reports 11.6 does not mean that is what the starter solenoid is seeing. Your problem could still be under the dash. Have you jumpered out the Clutch safety switch? Checked the Starter Relay? What year is your Z? (Fill out your user profile) Has the engine ever been washed with water? GM knew that the early years (90-92) were having occasional problems with the starter so in '93 they redesigned the start circuit. Not surprising that jumping didn't do anything. If it's the "DNS" then jumping won't help. Same story if it's a bad starter/solenoid. The trick here is to diagnose the fault without having to pull the plenum. Last edited by tccrab; 10-11-2007 at 03:36 PM.