Recent content by vprtech
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'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...- vprtech
- Post #7
- Forum: RT/10 and GTS Discussions
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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...- vprtech
- Post #11
- Forum: RT/10 and GTS Discussions
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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...- vprtech
- Post #9
- Forum: RT/10 and GTS Discussions
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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...- vprtech
- Post #7
- Forum: General Viper Discussion
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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/- vprtech
- Post #4
- Forum: RT/10 and GTS Discussions
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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...- vprtech
- Post #9
- Forum: RT/10 and GTS Discussions
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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) .- vprtech
- Post #3
- Forum: SRT10 and SRT10 Coupe Discussions
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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...- vprtech
- Post #16
- Forum: Performance Modifications
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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...- vprtech
- Post #9
- Forum: RT/10 and GTS Discussions
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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...- vprtech
- Post #7
- Forum: RT/10 and GTS Discussions
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'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...- vprtech
- Post #83
- Forum: SRT10 and SRT10 Coupe Discussions
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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...- vprtech
- Post #4
- Forum: RT/10 and GTS Discussions
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'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... -
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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.- vprtech
- Post #22
- Forum: RT/10 and GTS Discussions
