Engine shuts off while driving without warning - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Chevrolet When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-04-2014, 11:45 AM   #1
Junior Member
Thread Starter
 
Join Date: Jul 2014
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
cmcmillan3366 is on a distinguished road
Default Engine shuts off while driving without warning

I have a Z-28 Camaro 1997 model with a 5.7 liter engine. When driving the engine will shut off. Let is sit for 5 or 10 minutes it will start back up. Gives no warning. Doesn't miss, just shuts off like cutting the key off. It might shut down 2 or 3 times one day and then goes for weeks before doing it again. Any advice?
cmcmillan3366 is offline   Reply With Quote
Old 07-04-2014, 12:03 PM   #2
Senior Member
Posts like a Camaro
 
rjblazer's Avatar
 
Join Date: Jan 2010
Location: Elmira, New York
Posts: 853
Thanked 31 Times in 29 Posts
rjblazer has a spectacular aura aboutrjblazer has a spectacular aura about
Default

It might be the crank sensor.
rjblazer is offline   Reply With Quote
Old 07-04-2014, 04:19 PM   #3
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,142
Thanked 778 Times in 608 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Doesn't make any difference which car you have.....

Try spraying carb cleaner into the intake to see if the car starts or almost starts, to determine if it'* a fuel problem(injectors not firing or fuel pressure)....

Check for spark? This an Opti-Spark system?

Scan for "P" and "B" codes?
Tech II is offline   Reply With Quote
Old 07-05-2014, 09:11 AM   #4
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

97 is lt1 so it is optispark. if you test for spark and find none, icm test;


Start with the ign control signal on the white wire of the ICM pin B and at the PCM is on the black connector pin 5. The first thing to do is disconnect both connectors and check continuity from pin B of ICM to pin 5 of the PCM connector. You may need a second wire to reach it with meter. Obviously if there is no continuity, you have a wire to fix.

If ok, connect both ends and put the meter on AC Volts. While cranking the engine, look at the signal on the white wire of the PCM. It should have between 1 and 4 volts AC on it. Remember to ground the black lead.

If no AC signal, pull the connector at the PCM (black connector) and check the signal coming out of pin 5. If there is no signal coming out of pin 5 then most likely (notice I said most likely), the PCM is bad.

If the AC signal is getting to the PCM on the white wire, you must now look at the signals from the ICM to the coil. Ignition off. Meter set to DC Volts. First check for a good ground to the ICM. Put a meter lead on the + battery terminal and probe the black wire pin C on the ICM with the other lead. It should show a full battery voltage (12 or more volts).

If not you have a bad ground.

Ignition on. Meter set to DC Volts. Now check the pink/black wire on pin A of the ICM and the white/ black wire on pin D of the ICM for battery voltage (12 or more volts) remember to ground the other lead.

If the voltage is there, the problem is the coil. If it is not on those 2 pins, you have to determine if the wire from the coil to the ICM is broken, or if the connectors are bad or the coil is bad.

Also if the voltage is not on those 2 pins, check the #11 fuse (10 amp) the supplies the ignition. If blown, no voltage either.

If the AC signal is getting to the ICM and the ICM has 12 volts on pins A and D, the ground is good to the ICM, and you still have no spark the ICM is probably bad.
jwfirebird is offline   Reply With Quote
The Following User Says Thank You to jwfirebird For This Useful Post:
WilliamE (07-06-2014)
Old 07-05-2014, 10:34 PM   #5
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,142
Thanked 778 Times in 608 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

If no AC signal, pull the connector at the PCM (black connector) and check the signal coming out of pin 5. If there is no signal coming out of pin 5 then most likely (notice I said most likely), the PCM is bad.

But JW, what if you have no HI/LO resolution from the optispark?
there will be no spark and no injector pulse.....
Tech II is offline   Reply With Quote
The Following User Says Thank You to Tech II For This Useful Post:
WilliamE (07-06-2014)
Old 07-05-2014, 10:58 PM   #6
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,142
Thanked 778 Times in 608 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Forgot to mention, the crank sensor is not used for starting the vehicle, it is there only for misfire diagnosis......the optispark system did not use a crank sensor before OBD II...
Tech II is offline   Reply With Quote
Old 07-06-2014, 09:59 AM   #7
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

i just cut and pasted that procedure, never had one or worked on one
jwfirebird is offline   Reply With Quote
Old 07-06-2014, 12:13 PM   #8
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,142
Thanked 778 Times in 608 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Ha-ha, then consider yourself lucky JW....

When customers came in for 100 K maintenance/tuneup/driveability(misfire) problems with Firebirds, they almost passed out when they received a quote...

The time it took to replace wires, the time to replace plugs, we recommended new w/p'* even if the old one wasn't leaking at the time(if that sucka started to leak at the weep hole, kiss the optispark goodbye), replacing the cap and rotor, air and fuel filter....the price was insane.....most couldn't believe that you had to remove the w/p to replace the cap and rotor......more often than not, the flow though air system may not have been working and moisture and ozone built up in there would be corroding everything.....

Optispark was a great idea......car would start much quicker, and the PCM knew exactly where the pistons were for precise fuel injection......but tres costly to repair.....and a lot of guys had trouble diagnosing it....
Tech II is offline   Reply With Quote
Old 07-06-2014, 12:22 PM   #9
Senior Member
Posts like a Camaro
 
rjblazer's Avatar
 
Join Date: Jan 2010
Location: Elmira, New York
Posts: 853
Thanked 31 Times in 29 Posts
rjblazer has a spectacular aura aboutrjblazer has a spectacular aura about
Default

Tech II it is a 97 so it is OBD2.
rjblazer is offline   Reply With Quote
Old 07-06-2014, 09:31 PM   #10
Senior Administrator


Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,638
Thanked 991 Times in 770 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

OBD2 indeed yes. But. The 1997 Z28 Camaro came with a 5.7. Not like our regular 5.7 some of us have, but the LT4 330HP engine version which I'm wondering if the OP has.
Mike is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2001 lesabre shuts off while driving HELP Cosmo Buick 1 02-09-2013 09:32 AM
Engine shutting off at speed, without warning. mmidyette 1992-1999 8 07-26-2012 12:19 AM
Car shuts off while driving bigfish87 2000-2005 17 06-04-2009 11:59 PM
driving lights off while driving 99bonne Audio (and aftermarket electronics) 2 01-25-2008 02:30 AM
car shuts off while shifting gears ptrfair 2000-2005 9 05-05-2007 12:10 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:51 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.