Vats???
Thread Starter
Pro
Joined: Nov 2009
Posts: 583
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From: Maple Grove Minnesota
Vats???
Can the Vats be totally removed from the car?
I drove my 89 yesterday with no issues and today it was back to running on four cylinders like it was before I replaced the ignition switch and key as stated in an earlier post (Engine one side hot one side cold). I thought after that replacement it was good to go but now it’s back on four?
Is this a Vats issue or should I be looking at something else? Thanks!
I drove my 89 yesterday with no issues and today it was back to running on four cylinders like it was before I replaced the ignition switch and key as stated in an earlier post (Engine one side hot one side cold). I thought after that replacement it was good to go but now it’s back on four?
Is this a Vats issue or should I be looking at something else? Thanks!
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
To answer the question yes VATS can be totally removed from the car.
If the VATS system is "stock" & connected properly and the car starts & runs it is not the VATS system that has the issue.
Check/ inspect the harness. With the key "on" - you should have 12volts on 1 of the 2 electrical connectors for each of the injector harness plugs - no matter what. If you don't have voltage you have an issue with the harness, fuses/fuse block or wiring leading to the fuse panel (key switch). If the 12 volts is present at each injector connector- focus on the negative/ground side of harness, the ECM (injector drivers are not really serviceable) or ECM's grounds.
Unplug the ECM connectors and/or fuse block then ohm the injector harness back to each side of the injector connections if you need to.
Here is a digram to help visualize the circuit - it is pretty straight forward:
If the VATS system is "stock" & connected properly and the car starts & runs it is not the VATS system that has the issue.
Check/ inspect the harness. With the key "on" - you should have 12volts on 1 of the 2 electrical connectors for each of the injector harness plugs - no matter what. If you don't have voltage you have an issue with the harness, fuses/fuse block or wiring leading to the fuse panel (key switch). If the 12 volts is present at each injector connector- focus on the negative/ground side of harness, the ECM (injector drivers are not really serviceable) or ECM's grounds.
Unplug the ECM connectors and/or fuse block then ohm the injector harness back to each side of the injector connections if you need to.
Here is a digram to help visualize the circuit - it is pretty straight forward:
Intermediate
Joined: May 2008
Posts: 38
Likes: 1
From: Yuba City CA
If you proof every relay, switch, your key switch, etc, and your VATS computer is fine, this system will work. In my 87' I paid for a computer chip set that eliminated the VATS from the starting circuit. My car gives me absolutely no troubles now.
I left the VATS system disconnected but in place so I can restore the system in the event that these cars become collectable.
I left the VATS system disconnected but in place so I can restore the system in the event that these cars become collectable.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Can the Vats be totally removed from the car?
I drove my 89 yesterday with no issues and today it was back to running on four cylinders like it was before I replaced the ignition switch and key as stated in an earlier post (Engine one side hot one side cold). I thought after that replacement it was good to go but now it’s back on four?
Is this a Vats issue or should I be looking at something else? Thanks!
I drove my 89 yesterday with no issues and today it was back to running on four cylinders like it was before I replaced the ignition switch and key as stated in an earlier post (Engine one side hot one side cold). I thought after that replacement it was good to go but now it’s back on four?
Is this a Vats issue or should I be looking at something else? Thanks!
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
Not a VATS problem. Injector wiring ??
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
I believe you will find each bank of fuel injectors has its own fuse (2 total). I'd start my search there.
I think you have an injector pulling down a bank. It could also be a wiring issue.
The reason I suspect this is because the injectors are divided side to side whereas the spark/air/compression/rotation is not.
When it is in this failed mode and if the fuses look ok then try disconnecting the injectors one at a time. It may just go from a 4 cyl to a 7 cyl if you disconnect the one that is failed.
I think you have an injector pulling down a bank. It could also be a wiring issue.
The reason I suspect this is because the injectors are divided side to side whereas the spark/air/compression/rotation is not.
When it is in this failed mode and if the fuses look ok then try disconnecting the injectors one at a time. It may just go from a 4 cyl to a 7 cyl if you disconnect the one that is failed.
Thread Starter
Pro
Joined: Nov 2009
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From: Maple Grove Minnesota
Yes I checked the fusses first and they checked out good. I’m pretty sure it’s the driver’s side bank again that isn’t getting the signal again.
When I first had the problem I replaced the ignition cylinder with a new one that has the vats wires and chipped key because the old one did not I got all 8 cylinders back. This is why I suspected it to be a vats problem along with the fact that when I ran a scan it comes up yes for a vats problem.
Someone had taken the chip out of the key and put a clamp on it with one wire on each side to bypass the vats and used a generic ignition cylinder.
When I first had the problem I replaced the ignition cylinder with a new one that has the vats wires and chipped key because the old one did not I got all 8 cylinders back. This is why I suspected it to be a vats problem along with the fact that when I ran a scan it comes up yes for a vats problem.
Someone had taken the chip out of the key and put a clamp on it with one wire on each side to bypass the vats and used a generic ignition cylinder.
