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== misc notes == There is a base Corvette Coupe. Then there is the Z51 package. The C4 series corvette has the L98 5.7 L engine (a Chevy 350 ci). 1986 CORVETTE Z51 1986 Corvette Z51 1986 Corvette Hatchback Coupe 1986 Corvette 2-Door Hatchback Coupe 1986 Corvette L98 1986 C4 Corvette resources for corvette: --------------------------------------- http://1986corvette.info/general.html http://auto.howstuffworks.com/1986-corvette.htm http://www.corvsport.com/Corvette/C4/1985-1991/1986/C4_1986_VIN.html http://www.coolc4.com/1986-corvettes.htm http://en.wikipedia.org/wiki/Chevrolet_Corvette_%28C4%29 33849 == VATS == To diagnose VATS you must first understand what VATS is. Vehicle Anti-Theft System. Not an alarm, not a tattletale. IT simply disables the car so that it cannot be hot-wired or started by breaking the key switch or jumping solenoid wires. When your key containing the RESISTOR pellet is inserted into the key switch, the VATS module reads this as the correct amount of electrical resistance in this critical circuit. IF that resistance level is off by a given amount, the module locks out the permissions needed by the ECM to operate the fuel injector drivers, and the separate starter enable relay is locked out. Between these 2 systems, that car ain;t going anywhere unless its on a flatbed.... Because the only moving parts in a VATS is the key switch and the starter enable relay, those are usually where a failure takes place. Key switch is easy...the contacts that touch the key pellet get worn or bent and they fail to touch the pellet, so no go. Sometimes a skilled pair of hands with a dental pik can bend them back and all is well again. The starter enable relay...its a relay, so they DO fail on occasion. Located behind the breadbox, accessed thru the center display, replace as needed. A FSM will describe the test proceedure to know for certain if the relay is faulty or not. A common "fix" (not a fix but a bubba method of solving the problem) is to jumper around the enable relay. This allows the car to crank but not necessarily start becsause now if there is a VATS event, it cranks but the fuel injectors may not be enabled by the ECM...more difficult to diagnose when the system has been bubba'd. IF the Inj are not pulsing and its for SURE because of the VATS module, there is a bypass that can be done as a temp means of running. The more permanent fix is to remove VATS from the ECM program so its not looking for permission from the VATS module to allow fuel inj or starter operation. * http://www.corvetteactioncenter.com/forums/c4-general-discussion/130026-unique-vats-starting-problem-86-vette.html When I turn the key, no start. At the same time there is a clicking sound that happens under the dash. * http://www.corvetteactioncenter.com/forums/c4-technical-and-performance/113084-starter-relay-behind-dash.html == Battery #75FT-3 == DieHard Silver Battery: 75 Group Size, 650 CCA, 810 CA, 95 Minute Reserve Capacity, For Lower Power Demands Part # 75-2 Specifications BCI Group Size: 75 Cold Cranking Amperage: 650 A Cranking Amperage: 810 A Height: 7.312 in Length: 9.062 in Negative Terminal Location: Side Right Positive Terminal Location: Side Left Reserve Capacity: 95 min Voltage: 12.0 VDC Weight: 32.11 lb Width: 7.062 in

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