Recent content by vprtech

  1. V

    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...
  2. V

    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 .
  3. 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 ?
  5. 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...
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    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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    Spark Plug Boots EXTREMELY Tight

    They will come off the plugs a lot easier if the engine is warm. Just wear some cotton gloves so you don’t burn yourself. If the engine is warm and you carefully twist they will come off without much trouble. Side note, aftermarket wires are a lot more likely to fall apart or pull out of the...
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    94 Viper Engine Light On And Turns Over But Doesn't Start

    You might check for spark first, then for injector pulse using a test light. If both are there likely a fuel delivery issue. These ecus output 2 digit codes, “55” just means you are at the end of codes. https://www.allpar.com/threads/troubleshooting-chrysler-two-digit-computer-fault-codes.229056/
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    Gen 1 with heads and cam

    @ dicky: thank you for the feedback. Regarding Mainline hub dyno power numbers, I previously did a back to back comparison on a supercharged G3 Viper using my Mainline hub dyno and a Dynojet 248 making sure that the run conditions were the same, i.e. ambient temp, engine intake air temp, coolant...
  11. V

    Coolant flush

    If you want to actually flush the system I have had very good results with Cummins Fleetguard brand System Restore (to remove silicates or oil) or System Restore Plus (to remove corrosion and mineral deposits) .
  12. V

    More exhaust pop and flame questions

    Retarding the ignition timing on decel will cause more popping and burble on decel. It would take quite a bit of unburnt fuel and heat in the exhaust for there to be flames. If you have the capacity to do your own engine calibration work, I suggest you get the car on a roller dyno, and just...
  13. V

    Gen 1 to 2 PCM swap

    The 1996 RT/10 was a GEN1 with a JTEC. If you could find a harness and supporting parts, that would likely be your easiest bet to convert to a JTEC engine controller. I would suggest that you consider getting your GEN1 ecu remapped for whatever build you have in mind. The GEN1 ecu is...
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    1994 engine control module

    Popping or backfiring through the exhaust can be made much worse by leaks in the exhaust system. If there are leaks the extra air is siphoned in and helps to combust unburnt fuel in the exhaust on deceleration. The ecu can be reprogrammed to cut all fuel when the throttle is released which would...
  15. V

    '08 Tuning

    I think you guys may be giving up too easy. Certainly Chrysler will never openly release information on the Venom controller or any controller for that matter, as that acknowledgment would bring down upon them the EPA, CARB, and possibly their own internal warranty administration etc, etc...
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