Last night my buddy brought over his Hypertec tuner that he uses in all his dodges along with his 408 stroker pushin 700rwhp (9 second 1/4) we plugged it in and it said that there were no calibration programs to be found. So we took the ECU out of his 98 5.9L and swapped the 2. The tuner worked with his ECU and he made some changes to it but my gauges wouldnt work any longer and on top of that after it wrote the program we took it for a test drive and holy sh*t I've never heard so much pinging in my life! Which doesn't make sense because 2 weeks ago I replaced the plenum with the hughes plate put a new double roller timing chain on and a new water pump and everything was torqued to spec. I'm running 91 octane as well. What has me worried is he said that my engine is starving for gas and he recommended that I get new Injectors. On top of that after we put my ECU back in all the tunes he made stuck -_- so we had to plug his ECU back in and reset everything to stock. I'm dumbfounded, we haven't the slightest idea what could be the cause of this.

 

First let me say that I do not doubt that this happened to you. Now that being said, how the hell could the vehicle harness store anything? If you used his ecm and programmed it because yours was not programmable and then switched back to yours I can't imagine how it could hold the parameters of his ecm. Do your gauges work again?

 

Speed, his is a 98. Unlike the 94-97 cluster I wonder if a 98 cluster holds any info? That sure is funny that the entire cluster went crazy.

 

Ha I missed that tid bit of info. You may be onto something there with the cluster holding some sort of info but why would it hold onto ecm parameter settings? I am truly at a loss as to why it would do what it did.

 

But why won't the tuner find anything on my ECU? If I were to buy a superchips and try to tune it with that do you think the same thing would happen? Also, why is my engine pinging so bad? I replaced the plenum and I only use 91 octane and I have run 2 cans of sea foam through the engine in the past 2 weeks.

 

Has anyone got any ideas -_-

 

I am not overly familiar with Hypertech but perhaps his tuner was VIN locked and that is why it won't do anything with your ECM. As far as your pinging issue have you tried unhooking the battery and draining the transient voltage out of the system and rehook batteries and take her for a spin to get all new readings into the ECM for it to reprogram itself.

 

I find it hard to believe your buddy is running a 408 700hp motor with a hypertech tuner. You can't feed 700 hp on stock injectors. You can't tune bigger injectors with a hypertech. You can't get 700hp even on a 408 stroker without a huge cam, major head work and massive boost, or a hellva shot of spray. None of these can be accommodated with a "Made for Stock" hypertech canned tune. No offense meant, but I simply must call BS on this. I'm not trying to throw you under the bus, perhaps your buddy's not even fully aware of what he's got going on, especially if somebody else built that 700hp motor for him.

My guess is that the hypertech was already locked to another vehicle when you attempted to put it on yours. Hence the error code. That or the hypertech programmer itself has been wiped and there aren't any tunes on it, or it's defective.

My guess is that he's got more programming on his PCM to manage his engine than your relatively stock truck can handle, and I seriously doubt it's an over-the-counter hypertech tune. When you swapped the PCM, his PCM tried to do what it does in a truck that does not have the components it was programmed for. Running your truck either too lean, or timing far too advanced. Massive pinging ensues.

You'll need to get a hold of a known working HT or SC unit to test and verify that there really is a problem with your PCM before you completely write off your PCM.

A lot of people don't realize that there is a PCM AND an ECM in the truck. Both have adaptive learning features. It's possible that your buddy's PCM retaught your ECM to work better with it, then the quick swap back to your PCM caused fits with the ECM.

I suggest that you reinstall your PCM, disconnect both battery terminals and touch them both together (OFF the terminals, of course) and then reconnect. That will fully discharge any ambient charge in the system and reset the PCM and ECM.

 

The tuner was custom built for him by the owner of Hypertech. He met him at UTI and MMI and talked him into making a custom tuner for his dodge. And yes his engine has A LOT of work done to it. It's far from stock. Also he has used this tuner on 6+ different dodges between 95 and 2000. My truck is working fine now he reset the tune and everything is back to normal now.

 

OK Aims throw me a bone here. I was unaware that there is a PCM as well as the ECM. Where is the PCM located?