Recent content by vprtech

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    Production run 4778637AB from china

    I don't want to hijack this thread, only add that many times, in my experience of working on these cars for about thirty years, the idle valves are misdiagnosed to be the cause of idling issues especially on GEN2's . On engines with camshafts that are different than stock, and sometimes even...
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    Engine Starts then Stalls Immediately

    I would add that it is possible to reprogram the ECM (SBEC2) to permanently disable the theft alarm fuel shut off regardless if the alarm module is still connected.
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    94 Viper right sidepipe overheating and melting sill plate under door. Any ideas as to why this is occurring

    Typically an overheating cat is caused by an excessive amount of unburnt fuel getting into it, this could be caused by a stuck fuel injector or a misfire on one or more cylinders. In my experience, the most common cause of a misfire on a Gen1 Viper is faulty plug wires, if a spark plug boot...
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    Do I actually need a tune (or a VEC1)?: 96 GTS heads/cam 511 whp (but then there's 675 nitrous)

    Link : https://www.zeitronix.com/Products/zt2/zt2.shtml?srsltid=AfmBOoqrrMM2L4fzyPmbb8fgr-PK8OXnlmbbycdx7XerheHag6xB28M9
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    Do I actually need a tune (or a VEC1)?: 96 GTS heads/cam 511 whp (but then there's 675 nitrous)

    I mean that is why they run on the rich side, to protect the catalyst under high load , otherwise the catalyst will not live very long, especially survive the emission warranty . 100% Correct, it does cause the ignition timing to advance but it will also lean out the mixture, in addition it...
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    Do I actually need a tune (or a VEC1)?: 96 GTS heads/cam 511 whp (but then there's 675 nitrous)

    Sure, that is correct, but the same can be said with opening or closing the throttles as you are changing the manifold pressure. When you improve or change the air flow efficiency of the engine, the engine flows a different amount of air at a given rpm/map , sometimes more - sometimes less...
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    Looking for a Viper tech in LA area 91367

    [email protected]
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    Difference between PCM 96 and 98 ???

    As someone else said, if the fuel pump relay is not being actuated by the ecu and you power and grounds are good then it’s a ecu problem.
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    Texas Emissions test

    I would add that with Belanger headers, or any headers for that matter, putting the O2 in one pipe will usually not allow you to pass the tail pipe check even with a good set of CATS. That is because the individual cylinders do not run at the same afr . On the Belanger headers the pipe they have...
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    Looking for a Viper tech in LA area 91367

    If Dan is not available you can also PM me. I’ve worked with Dan since the 1990’s and I’m in Lawndale .
  11. V

    Difference between PCM 96 and 98 ???

    Here is a short how-to to check power and grounds at your ecm. Disconnect the power cable at the pdc before you remove C1. Once C1 (the black connector) is unplugged remove the connector back cover by pinching the tabs as shown below. Plug the connector back in, reconnect power cable at pdc and...
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    Difference between PCM 96 and 98 ???

    So I assume you have removed the back cover on C1 and then back probed pin 2 to check for power with key on and pin 22 for constant power? Also, have you checked both grounds at C1 on pins 31 and 32 ?
  13. V

    '99 GTS starts and stalls/dies

    As other people in this thread have mentioned, low cranking voltage is a problem. The IAC is a stepper motor and the computer (JTEC) will, under certain circumstances relearn the position by bottoming it out. It then keeps track of the “steps”. If while cranking the voltage drops below a certain...
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    Sometimes stalls when coming to a stop.

    @ GTS Dean, I'm not sure I understood 100% what you were trying to say in your post. Do you agree with what I said or are you saying that the IAC should compensate for the throttle opening on the passenger side therefore it make no difference ? The MAP sensor location has more to do with...
  15. V

    Sometimes stalls when coming to a stop.

    Hi, I worked as a dealer Viper tech in the 1990’s and I also understand how they work at the code level as I tune these. You must adjust the cables so that the drivers side throttle body is opening just before the passenger side . Don’t adjust them to open the same, it would be better to have...
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