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#1 |
Join Date: Feb 2012
Location: Clemson, SC
Posts: 18
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I have a 92 ZR-1 with 122,000 miles on it. I've owned it for about 6 months. During this time it has periodically refused to start (no crank) and when this happens, the security light is on. I'd say somewhere around 1 in 30 starts this would happen. Irritating, but not a huge deal, as waiting 5 minutes would see it start just fine.
Recently, however it has gotten much worse. Now it's probably 1 in 4 starts that this happens, and it sometimes takes 30 minutes of trying to start every 5 minutes before it will start. The pellet reader in the ignition key has been previously bypassed by soldering a resistor into the leads. This was done by a previous owner. I looked at it and it seems to be well done, no loose connections, resistance is 7.5 ohms. I replaced the battery, as I had read that this sometimes helps, and I didn't know how old the battery was. Also, when this happens, push starting the car doesn't work. I assume that rules out the possibility that it's the clutch switch or the starter itself. I'm kinda at a loss here and am looking for any suggestions. Thanks in advance. Last edited by dorri732; 06-24-2012 at 09:39 PM. |
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#2 |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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You're on the right track pursuing the resistive pellet direction. As long as you're seeing the security light come on you've got a problem with VATS.
However, this doe not rule out parallel issues. You could still have a clutch switch issue but I'd ignore secondary issues like that for now. How do you know it's 7.5ohm? That doesn't sound right. I just check the pellet table and there is no such valid value. What are the color rings on the resistor?
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#3 |
Join Date: Feb 2012
Location: Clemson, SC
Posts: 18
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Thanks for the reply. I was going from memory on the resistor value, it was a few weeks ago when I checked it. Looking at the tables now, it's probably 7500 ohms.
I found a vats bypass module on Ebay. It's supposed to be used for installing remote starters. It looks like that, combined with jumpering the starter relay should take care of my problem. I'll silk have the security light, but it won't be able to do anything. Does this sound right? Anything I'm missing? |
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#4 | |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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If the Security light still comes on you still have a VATS issue.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#5 |
Join Date: Feb 2012
Location: Clemson, SC
Posts: 18
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I'd still have a problem with VATS itself, but if I understand correctly, VATS wouldn't be able to do anything at this point.
I believe (and I could be wrong) that the only three things that VATS does is disable the starter (bypassed by jumpering the relay), disable fuel (bypassed by the module mentioned above which sends a 50 hz signal to the ECM telling it to send fuel), and turn on the security light (which I don't really care about). I was basing this on this post by Marc H. However, instead of changing the chip to disable the fuel portion, I was planning to use the bypass module, simply because it's available for $15.00. I guess I'm just looking for some confirmation that I'm not missing something. Thanks again for your help. |
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#6 | |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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Sounds weird that you'd even be interested in a 7500 ohm pellet if you're doing all the relays and bypasses etc.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#7 |
![]() Join Date: Jan 2007
Location: Florida
Posts: 241
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Years ago on my '87 I bypassed the vats with a resistor and had limited success. The reason was I bought the resistor at radio shack. When a friend suggested going to an electrical shop for a more accurate resistor all worked fine.
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#8 |
Join Date: Feb 2012
Location: Clemson, SC
Posts: 18
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Scott: I was only mentioning the pellet to rule that out.
Jim: The value I posted was what I measured with a meter, not what I read from the stripes on the resistor. After further digging/googling I've come to the conclusion that my BCM/CCM may be failing (or have poor connections, I'll try cleaning the connectors before I go any further). An additional symptom that I didn't mention before because I didn't see how it could be related is that occasionally when I start my wipers first thing in the morning to clear the dew from the windshield, they won't stop. The best I can do is put them on intermittent. They will continue until I turn the car off and restart it, then they work normally. What I didn't realize is that the wipers (as well as VATS) are also controlled by the CCM/BCM. If I can't repair/replace it, I'll still install the bypass module and jumper the starter relay just to be able to drive it. Again, thanks to all who have responded. |
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#9 | |
![]() Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,207
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The two big grounding bolts at the back of the engine come to mind.
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Scott ![]() Vett owner since 1979._It's about the car and the people |
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#10 |
Join Date: Feb 2012
Location: Clemson, SC
Posts: 18
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Thanks Scott, that's something else I'll certainly check.
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Tags |
no-start, security, vats |
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