LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

totaly confused...

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Old Apr 17, 2008 | 08:11 PM
  #1  
BlkZ28Kreepn's Avatar
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totaly confused...

i've been having a problem with my car..94 camaro lt1 bolt-ons cam,full msd ignition..heres my situation..while back car kept turning off when reaching operating temp. it would start fine,run fine when cold..get it scaned codes are 16,36,42 i changed out the opti harness,icm..still did the samething..so monday i get it towed to a friends, dads shop...he scans it, didnt give me the codes but says the keyless entry reciever is failing..does that sound right to anyone,can that cause my car to just shut off? car turns over every time,when cold..just that now it runs for 4-5 mins and shuts off,wont start back up for a couple minutes.im so freakin lost...worse part, i guess only dealers can do that? since theres programming involved with the key? i dont want to go waste 500-1000 dollars on a part and over priced labor for nothing haha..thanks for anyhelp..all my attention was on the opti, now its the reciever..thoughts?
Old Apr 18, 2008 | 12:28 AM
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Replace the coolant temp sensor. It sounds weird but i found several who did this and it fixed problem. Im one of them and 1 year without any issues. Heres one of the posts.


https://www.camaroz28.com/forums/sho...hlight=shutoff
Old Apr 18, 2008 | 06:50 AM
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Find out what codes you are now getting. Bypass your MSD box to see if that changes anything. The keyless entry would have nothing to do with the engine shutting off.
Old Apr 18, 2008 | 08:37 PM
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Its the one thats in the water pump.
Old Apr 18, 2008 | 09:53 PM
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you can bypass the vats system is bad in the ignition switch but without spending a ton of money you can bypass the system with a multi meter and some resistors from an electronics store like radio shack.

FIRST-take your key and measure the resistance in the little chip you will get a number usually in the 4's
SECOND- go to radio shack buy a few different size resistors there cheap like 2-3 buck for like 10 different sizes.
THIRD- take the resistors and add them together until you get the same number and your key.
FOURTH- go under the dash of your F car and look for a tube of wires that is orange that is your vats system wiring follow the wires until you find a 2 wire plug.
FIFTH- seperate the plug and put the resistors into each side of the w prong plug THAT IS ON THE PCM SIDE OF THE PLUG NOT THE KEY SWITCH SIDE.
this will bypass the theft lock system
Old Apr 18, 2008 | 10:13 PM
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Nothing he is reporting seems to be remotely VATS related. VATS does not cause your engine to die while you are driving.
Old Apr 18, 2008 | 10:22 PM
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vats will kill power to the pcm as soon as signal is lost therefore killing the motor and putting a security light up for about 10 minutes not allowing you to start the car
Old Apr 18, 2008 | 11:28 PM
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Originally Posted by lt1transamgt94
vats will kill power to the pcm as soon as signal is lost therefore killing the motor and putting a security light up for about 10 minutes not allowing you to start the car
Not while you are driving, only a few seconds after the engine is started will it kill the engine. VATS has nothing to do with an engine that dies after 4-5 minutes.
Old Apr 18, 2008 | 11:44 PM
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Originally Posted by lt1transamgt94
vats will kill power to the pcm as soon as signal is lost therefore killing the motor and putting a security light up for about 10 minutes not allowing you to start the car
Do not argue with the shoebox!
Old Apr 19, 2008 | 12:19 AM
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Originally Posted by LSWHO
Do not argue with the shoebox!
By all means, it's ok. Nobody is right all the time. However, in this case, I am confident with what I have posted.
Old Apr 19, 2008 | 12:31 AM
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no mention of the security light on either.
Old Apr 19, 2008 | 09:58 PM
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no security light, when car dies just the check gages light comes on and rpm needle is bouncing up and down..thanks for your help guys, had the car towed to a different shop..hopefully they can figure somthing out..let you know how that goes..
Old Apr 20, 2008 | 08:12 AM
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My 94 Formula would shut off going down the road. Would not restart till the vats reset. Turned out after much work and money spent and changed parts, the chip in my ignition key was bad.
Old Apr 20, 2008 | 08:33 AM
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Originally Posted by gecole80z
My 94 Formula would shut off going down the road. Would not restart till the vats reset. Turned out after much work and money spent and changed parts, the chip in my ignition key was bad.
Perhaps you had more than one thing wrong, but the VATS is designed to not do that.
Originally Posted by shbox.com
If the system detects a fault with the lock cylinder circuit after the engine is already running, the SECURITY lamp will light. The engine will be able to be restarted. This is called “fault enable mode”. (The system saw a good reading from the key at one point during a previous ignition cycle before the failure. So, it considers it a problem and not someone trying to steal the car.) When in fault enable mode, PASSKey protection is disabled until the problem is repaired.
Old Apr 20, 2008 | 04:37 PM
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Its possible I had more than 1 thing wrong. I bought this abused Formula a few years ago just to have some fun with it. Same day I bought it i had the dieing problem. I removed an aftermarket alarm system. Didn't help. Installed a new fuel filter, didn't help, changed the fuel pump, didn't help, installed msd coil, didn't help, installed a new opti, didn't help. I needed an extra ignition key so i stopped by a Dealer to have a key made and the parts guy checked my key for the code and told me that my key was defective. He told me they have had many keys go bad that they had replaced. Since getting the new key 3 years ago the car has not died or stalled out. I dunno but thats what happened to me. I have new problems now. Stepson added water to the radiator without bleeding the water lines over heated and cracked both heads, just pulled the motor and tranny today. Time for a complete rebuild has over 110k miles and had water in the oil.



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