93 with no start problem - ZR-1 Net Registry Forums

Alberta_ZR1 · 07-04-2011

Hello Gang,

I've got a no start problem and I'm looking to see if anyone has any quick suggestion or common causes before I jump into the diagnostic charts in the FSM.

Here is the history....

My last big road trip down to Montana I was experiencing hard starting when the car was hot and driven for a lengthy period. Then on the second day, the car sudden stalled out and would not start, only turn over. I popped the hood, did some minor touching of connectors etc. After 10 minutes, the car started and ran fine. On the third day, waiting at the border crossing, the car has a hell of a time starting after shutting it off to talk with border services (at this point I'm thinking my new fuel regulator is giving me troubles).

Travel 4.5 hours at various speeds with no troubles. I pull into a small town for a soda and bam no start. Pushed it to a friend's house and played around with it. Popped the fuel lines, had pressure etc. Continued to play with it and finally after 45 minutes it started. I got it home (well almost) and then it quit again. It?s been in the garage since then and it won't start no matter what.

There is no CEL.

Due to a busy work schedule, I haven't had much time to thoroughly dig into it. I have check the basics and found that I have no spark. I've checked the connectors by the coils etc, all look good.

The plan is to get into over the next few evenings and hopefully figure out the cause. I know the crankshaft sensors suck in GM?s, so I was leaning towards maybe doing that.

Any suggestions would be greatly appreciated!!

PS - I tried running a search for similar topics, but some of the words are too small or too common, so they don't bring back any results. For example "no start"

Thanks again

Tyler

sammy · 07-04-2011

just a thought but how old are your coils ????

Alberta_ZR1 · 07-04-2011

Quote:

Originally Posted by sammy

just a thought but how old are your coils ????

I basically did a complete over haul this winter on ignition and fuel systems (new plugs, coils, wires, injectors, fuel filter, and regulator)

That's why I was so disappointed to have it quit on me

Alberta_ZR1 · 07-06-2011

Did some diagnostics's tonight and it appears that I have an open circuit between the ignition module and the crankshaft position sensor.

I crawled underneath and the wiring looks good, so now I just need to get access to it so I can check the resistance of the sensor.

Any suggestions on where to buy a new crankshaft sensor? I'm going to try GM tomorrow.

Any suggestions on the removal of it? I see the exhaust heat shield should come down, but I have no clue how many more bolts are holding that thing in place.

Thanks for the help,

Tyler

Kevin · 07-06-2011

have you bypassed to clutch safety switch

Alberta_ZR1 · 07-06-2011

Quote:

Originally Posted by Kevin

have you bypassed to clutch safety switch

That's a good suggestion, but the car does turn over, it just won't fire. I think the clutch safety switch would cause the motor to not even turn over, but I could be mistaken. I haven't looked at that system very closely.

I checked the resistance on the crankshaft position sensor circuit at the ignition module and I'm getting an open circuit. The FSM says I should have a reading of somewhere between 800-1200ohms. It says that anything under 800 is a faulty sensor. So I want to at least check the sensor on its own to see what it has for a reading and then check the continuity of the wiring.

HADI-ZR1 · 07-06-2011

Tyler
Did you washed your engine before that issue?!

Kevin · 07-06-2011

you're right but it never hurts to do the cheap thing first

Alberta_ZR1 · 07-06-2011

Quote:

Originally Posted by HADI-ZR1

Tyler
Did you washed your engine before that issue?!

Nope it just started happening while I was on a 1200km road trip. Then at the end of the trip it died permanently.

Alberta_ZR1 · 07-30-2011

FINALLY! The LT5 is alive and well.

As suspected it was the crankshaft sensor. So I tried to remove the sensor for inspection and the top of it literally fell out in my hand (explains the open circuit I was seeing).

So after spending 2.5 days trying to dig the rest of the sensor out, I finally decided to order up an oil pan gasket from Jerry and go in from the bottom. The gasket arrived late this week and it took me 35 mintues to force the old sensor out with a hammer and punch.

PS - A positive was that NAPA had this sensor in stock...

07-04-2011	#1
Alberta_ZR1 Join Date: Jul 2010 Location: Calgary Alberta Posts: 191	93 with no start problem Hello Gang, I've got a no start problem and I'm looking to see if anyone has any quick suggestion or common causes before I jump into the diagnostic charts in the FSM. Here is the history.... My last big road trip down to Montana I was experiencing hard starting when the car was hot and driven for a lengthy period. Then on the second day, the car sudden stalled out and would not start, only turn over. I popped the hood, did some minor touching of connectors etc. After 10 minutes, the car started and ran fine. On the third day, waiting at the border crossing, the car has a hell of a time starting after shutting it off to talk with border services (at this point I'm thinking my new fuel regulator is giving me troubles). Travel 4.5 hours at various speeds with no troubles. I pull into a small town for a soda and bam no start. Pushed it to a friend's house and played around with it. Popped the fuel lines, had pressure etc. Continued to play with it and finally after 45 minutes it started. I got it home (well almost) and then it quit again. It?s been in the garage since then and it won't start no matter what. There is no CEL. Due to a busy work schedule, I haven't had much time to thoroughly dig into it. I have check the basics and found that I have no spark. I've checked the connectors by the coils etc, all look good. The plan is to get into over the next few evenings and hopefully figure out the cause. I know the crankshaft sensors suck in GM?s, so I was leaning towards maybe doing that. Any suggestions would be greatly appreciated!! PS - I tried running a search for similar topics, but some of the words are too small or too common, so they don't bring back any results. For example "no start" Thanks again Tyler

07-04-2011	#2
sammy Join Date: Jun 2010 Location: Lone Pine, CA Posts: 580	Re: 93 with no start problem just a thought but how old are your coils ????

07-06-2011	#4
Alberta_ZR1 Join Date: Jul 2010 Location: Calgary Alberta Posts: 191	Re: 93 with no start problem Did some diagnostics's tonight and it appears that I have an open circuit between the ignition module and the crankshaft position sensor. I crawled underneath and the wiring looks good, so now I just need to get access to it so I can check the resistance of the sensor. Any suggestions on where to buy a new crankshaft sensor? I'm going to try GM tomorrow. Any suggestions on the removal of it? I see the exhaust heat shield should come down, but I have no clue how many more bolts are holding that thing in place. Thanks for the help, Tyler

07-06-2011	#5
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: 93 with no start problem have you bypassed to clutch safety switch __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

07-06-2011	#7
HADI-ZR1 Banned BANNED Join Date: Sep 2009 Location: Q8 Posts: 215	Re: 93 with no start problem Tyler Did you washed your engine before that issue?!

07-06-2011	#8
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: 93 with no start problem you're right but it never hurts to do the cheap thing first __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

07-30-2011	#10
Alberta_ZR1 Join Date: Jul 2010 Location: Calgary Alberta Posts: 191	Re: 93 with no start problem FINALLY! The LT5 is alive and well. As suspected it was the crankshaft sensor. So I tried to remove the sensor for inspection and the top of it literally fell out in my hand (explains the open circuit I was seeing). So after spending 2.5 days trying to dig the rest of the sensor out, I finally decided to order up an oil pan gasket from Jerry and go in from the bottom. The gasket arrived late this week and it took me 35 mintues to force the old sensor out with a hammer and punch. PS - A positive was that NAPA had this sensor in stock...