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  1. 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/
  6. V

    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...
  7. 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) .
  8. 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...
  9. 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...
  10. V

    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...
  11. 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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    Head Scratcher ... Dodge Can't Help ... Drive Cycle Readiness. Help?

    I've diagnosed many of these reset issues (on Vipers), and I think most everyone here has outlined many of the possible causes. I will add that your are potentially dealing with two separate issues. Regarding the reset, I have run across faulty ecus having this issue, but normally not on a GEN3...
  13. V

    1994 engine control module

    Question for you, did you recently have the intake manifold off the engine. I have seen an issue, where two or more injector connectors are swapped left to right bank, which causes the fuel trims to ramp all the way rich or lean. What you really need to do is get the car hooked up to a scan...
  14. V

    '08 Tuning

    Keep in mind that the ecu used on the GEN4 Vipers is a completely different animal than the NGC controllers used on other Chrysler vehicles. It was designed in collaboration with Zytek , Motorola and Continental Automotive Systems in parallel with the GEN4 engine development, which is also a...
  15. V

    Stinking check engine light!

    The ground wire ends up at a ring terminal at the A/C compressor, that is, the wire should be terminated by one of the A/C compressor bolts.
  16. V

    Emergency brake POPS and has a spring sound when pulled up high ... normal? ---

    The grease on the ratchet mechanism can dry up, I lubricate them with ZEP45 which is like TriFlow, you might want to try that.
  17. V

    PCM reset and now have power / Need Help

    Don't mean to reply to such an old thread lol , but the likely cause of your loss of power is the long term knock trims. Just like with the fuel trims, there are adaptive values for spark retard from knock. When you disconnect the battery, the volatile memory is cleared, which is where adaptive...
  18. V

    SCT Question.

    I don't believe it's so much that they are behind , it's just that there is not nearly the same market for Dodge tuning software. Also, GM and Chrysler go about things differently , GM uses a VE model taking advantage of both MAF and MAP , while Chrysler (up until the 08-> VENOM) has used a MAP...
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    Stabilizing Cooling Temps With A/C Fan???

    I agree with dave6666 , the only way to effectively cool down then engine is to get more air flow through the radiator. We have a kit that adds two additional cooling fans in front of the A/C condenser to push the air through, in effect boosting the stock cooling fans capability. It makes a...
  20. V

    SCT help

    I'm not quite sure I understand what you are saying here. If the issue is that you cannot save in Advantage , then you should contact SCT. It would help if you could provide a more detailed, step by step of what you are doing when you try to save and program you car. - Chris DC Performance...
  21. V

    SCT Tuning - O2 heater malfunction

    This can be fixed, please call me at the shop for details or send me a PM. - Chris DC Performance: Proven Performance 310-841-6996
  22. V

    Ideas on possible fuel system upgrade

    We have worked on, repaired, and rebuilt many fuel systems at our shop. I would say that sumping, or running a pump pickup to the bottom of the fuel tank with no surge tank or fuel reserve is a unacceptable. Let me clarify one thing about the factory fuel pump, it has two separate functions in...
  23. V

    Engine management

    We have done SBEC calibration work on supercharged cars, but have not been able to tune them without help from a piggy back controller. The fueling strategy is very different from the straight pulse width look up tables that the JTECs use . It's a ongoing project, but I hope to have a working...
  24. V

    Gen 1 - Idling Question

    Besides the advice from the previous post, is the engine modified, and is this a new problem that just started happening? I think it is likely unrelated to the fuel pump replacement, other than if you disconnected the battery, it may have wiped any non-volatile memory where adaptives for AIS and...
  25. V

    Tuning Gen 1 PCM's

    Gains can depends on what kind of modifications have been done to your car. With minor modifications, you may not see huge improvements. We have found there is a bell curve relative to certain bolt on modifications and the calibration. The early SBEC cars can run on the rich side stock...

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