I just got a ECUreflash(beta) about 3 weeks ago. The car was running fine until recently. The problem is whenever I give the car Full throttle at about 3 to 6 rpms at any mph above 30 the car will jerk(ONCE) and give me a {!}sign and go limp along with a service engine soon light. Whether its from a dead stop or picking up speed on the interstate(usually around 85 on interstate). When it goes limp I pull over CUT car off,CUT car on again then it runs normal again until I do the above again. Now I noticed that the car wouldnt go full limp with the asc disabled.
I dont know if its because of any of my mods or the tune but any info will help.

ULTIMATE RACING DUAL EXHAUST
ULTIMATE RACING O2 HOUSING
ULTIMATE RACING HIGH FLOW CAT
HKS SSQ BLOW OFF VALVE (vta never had a problem doing)
INJEN COLD AIR INTAKE
INJEN UPPER INTERCOOLER PIPE
TurboXS manual Boost controller at 22psi
Autometer Boost Gauge

btw Mustang Dyno 310 awHp / 295 tq at 22psi
DynoJET est. 365 awHp / 348 tq at 22 psi

 

hmmm.... i would hit up auto-zone and get your CEL code(s) read, then look them up on here. Good luck, hope it's not serious.

 

i have a different setup but am using the ur intake and occasionally get the same symptoms. the code i get is a 1241 i believe, it is too much air flow for throttle position. once you get your codes pulled check it out and see if it is this one. that maybe your problem if it is try rotating your maf housing and see if you find a position that works better for you. good luck.

 

sounds like its in the tune, did you do a mail on flash or dyno flash. I had this problem on my first tune and had to be retuned.

 

I had the codes pulled a week ago. one was p1234 or something close but the description was something like feul mass air flow. I got dyno flashed. I didnt mention that I also have ACT Heavy Duty Clutch and ACT streetlyte flywheel. Does that have any thing to do with it?

 

You said you have the ECUreflash(beta). Where the hell did you get this? Ask help for the person who gave this to you. I am pretty sure its the tune. If not it is your boost controller or BOV. Just because your boost controller or BOV did not cause any problems before does not mean its not the problem. Boost controller and BOV on the evo x cause alot of problems.

 

I'm hearing that the stock boost control is the best for the x so far? Any truth to this?

 

I did notice that at half throttle at certain rpms and mph tha the bov would flutter a bit like it didnt know if it needed more boost(throttle) or if it wanted to release. I was told that was normal.

 

just for my own curiosity... how would the boost controller or BOV cause something like that? i would assume it would still have something to do with making the MAF un-happy? could it also possibly be that the tune is too lean causing the engine to be out-flowed by the turbo... causing a cylinder to miss?

 

Someone else suggested that to me too. I havent had time to go back to my tuner yet but I plan on doing that as soon as I get the chance.

 

Somebody also thought that it was the actual ecuflash program.

 

i am having the exact same problem. i have a manual boost controller custom intake and ic piping and custom exhaust. im boosting 1.5bar without a tune and i have the exact same symtom. my ses light turns on and off every now and then ever since the intake was installed. was wondering why my car goes limp while at WOT on the freeway above 80mph.

 

I mentioned this about 2 months ago for ALL GUYS WITH MBC ..

When weather starts turning cold, you guys are going to get your CELs popping like christmas trees ..

For the disbelievers who insist this is not the case .. just go to an empty road and start pushing your car ..

You can't run away from how the car is programmed .. you put in MBC, you WILL get CEL if you drive it like an EVO ..

If your car is tuned by a tuner, go back to the tuner .. There's only a few that have access to beta .. and they SHOULD KNOW how .. they should have taken that into account .. unless the MBC was fixed or adjusted after the flash ..

 

A P1235 is an overboost at partial throttle code. The cause is no doubt the MBC; manual boost controllers are garbage on an e throttle car like the X. They cause the turbo to produce almost full boost at partial throttle, and the reference tables in the ecu that measure air flow/rpms/tps etc see a discrepancy and it throws the car into limp mode. Add in cold weather (where the denser air is going to cause the turbo to spool more freely and run more efficiently) and it's overboost city. Ecu controlled boost works much better, is more precise, and retains full boost correction and safety features.

This topic was well covered when the car first came out, but I guess most of you weren't here (lots of new members in here). While some people just like MBCs because they are used to working with them, they are crude and imprecise compared to ecu controlled boost and IMP have no place on a car like the X. On top of this, it sounds like the tune wasn't done by someone who knows what they are doing and that's probably part of the problem as well. Find a tuner that knows what he's doing and take that POS MBC off your car. Problem solved.

 

What options are there for this? Anyway to run an upgraded boost solenoid and control it with the ecu? Are people have these problems with the AVC-R/Blitz etc.?