since my dyno tune i have been throwing the misfire code (p0300?) it happens in my race-gas map.(the only map i dynoed) if your standing on the gas then you get this machine-gun sound until you take your foot off the gas, and stomp on it again. will this "problem" be a thing of the past with v3? and does anyone know that with a v3 upgrade will i lose my v2 dyno hp gains? and can someone tell me why kamakazze pilots wore helmets?

 

if it's related to the tranny then no

 

thanks for that tip. i did however have the xede for 6 months before i got it dynoed by shiv, and i DID NOT have the misfire code. so if the only thing i did different to the car was to have it dynoed, then it cant be comming from the trans, correct? as soon as i took my car off the dyno i drove it down the street, and i got my first misfire code. lets just assume the problem is in the xede.........will the upgraded v3 solve the misfire problem?

 

from what i've researched, read and talked with people the Xede should not be causing a P0300 code. I think the reason why Shiv delayed V3 was because they were getting the P0300 code and were trying to figure out how to fix it. It's in one of the threads so search for that. obviously that doesn't relate to you.

There were also problems with the older software version of the Xede. Now as you're saying you did not have that problem earlier i'm thinking you have the updated software. Definitely call Shiv and get his opinion on it.

As for the tranny harmonic resonance problem this can happen anytime...so it could be that. Do you get the P0300 while driving in 5th gear around 3000rpm? ie at part throttle. If it comes on at full throttle than it might be your coil pack (like the issue with the Motor Trend car).

The P0300 has plagued so many evos and everyone has a different story to tell, but the consensus is that it's the tranny issue.

If you think it's the Xede, I would suggest that you check with Shiv to see what
software version you have. If that is not the case, then you can disconnect the Xede to see if the P0300 goes away. If that is the case then the problem is definitely with the Xede or the Xede harness. However, Shiv has mentioned before that the harness problems have been fixed a long time ago.

hope this helps. i'm hoping other people can provide more insight.

The other thing that could be is the Dyno itself. What i'm trying to say is that say if your car never threw a p0300 code before and then the stress on the drive train caused by the Dyno may have had some effect on the tranny. ie loosed up something that may be causing the harmonic resonance and thus causing the p0300 code

good luck

 

IMO there is no way the misfire is tranny related.For one thing no one with a complete stand alone engine management is having this problem.

I never threw this code once before I hit 30k miles. Right around the time I installed the xede. My symptoms are exactly like smokedmustangs and I have had this happen in every gear but 1st. Sometimes I'll go for a month without it and then boom it'll happen a couple times a week. 9 times out of 10 it happens after I fill up with gas.

Dont get me wrong, Im not blaming the xede, I know plenty of people who get this that are running bone stock, but it would be nice if this mystery could be solved. I wish someone could catch it with a data-logger and maybe shed some light on exactly whats happening.

 

let me re-iterate. I bought the xede and had the xede flash at the same time. my mods cams/gears/FMIC/tbe(no cat) i downloaded the race gas map into the xede and have my pump-gas map flashed into the ecu. i drove the car with15K-18K miles-spirited as well as around town. thats alot of miles with the xede and no problem. there would be times where the only thing in the tank was 110 leaded, which i must say was pretty much 10K of those miles. NEVER once did i have a misfire code. when the car was dynoed by shiv in chicago last year, everything was fine. inbetween dyno-pulls, shiv himself took me and my cousin for a test drive in my car immediatley after the dyno pull. once the misfire code hapened (with shiv driving) my cousin and i said in "stereo" "what the hell was that?" shiv said that is a misfire code , its pretty common. it does it in 1st/2nd, at times however rarely in 3rd gear, never in 4th or 5th. it always happens with the gas pedal at 70-80% depressed. it almost comes natural, as i seem to know at what rpm this will happen. once the foot is off the gas, and i immediatley stomp on it again, the code doesnt return. THIS ONLY HAPPENS WHEN I HAVE THE RACE MODE/MAP on (post dyno day). never HAS IT HAPPENED WITH THE PUMP-GAS MAP. AND IT NEVER HAPPENED WITH THE RACE-GAS MAP Before the dyno day!!
i'm not blaming anyone or do not want to cause a stink, i just want to know if my problem will go away with the v3?
0det91]IMO there is no way the misfire is tranny related.For one thing no one with a complete stand alone engine management is having this problem.

I never threw this code once before I hit 30k miles. Right around the time I installed the xede. My symptoms are exactly like smokedmustangs and I have had this happen in every gear but 1st. Sometimes I'll go for a month without it and then boom it'll happen a couple times a week. 9 times out of 10 it happens after I fill up with gas.

Dont get me wrong, Im not blaming the xede, I know plenty of people who get this that are running bone stock, but it would be nice if this mystery could be solved. I wish someone could catch it with a data-logger and maybe shed some light on exactly whats happening.[/QUOTE]

 

if anyone who is trying to solve this problem needs my car to help. I'll throw it on a truck and have sent out to you.

 

it may be true, but then again it's just a figgin' mystery as to what the root cause is of the P0300

 

I recently upgraded to V3, still throw 300 code but less often, the car feel smoother especially at WOT. When I've stage 1+ the car never throw any code. The code started coming after a turbo upgrade, usually at low rpm. But the car feels normal when it throws the 300 code. I'm so use to it now, that it doesn't brother me any more, I'm just wondering what the long term effect it has on the car. BTW I've a code reader that clears the cel, so it's all good...