Hello,
I have EVO 9 with stock engine, when I bought the car, it has a little hesitation/minor miss fire only cold start,
I have replaced the spark plug with a new set, gaped @ .020. the issue still on.
I have replaced the coils with another stock coils, and the issue still on,
I have bought okada ignition coils I bought from a tested car that I have drove myself, and the issue still on,
I have replaced the Crank position sensor with OEM from STM, the issue still on.
I have replaced the stock fuel pressure regulator with Aromotive 13301 regulator, -6 in and -6 return, the issue still on, still running OEM fuel rail.
I did boost leak, no issues and cleaned all injectors "homemade rig" and nothing has changed.
I have installed Dynatech Arc-2 with AEM pencil Coils "all tested good from my dsm" and issue still on. KEEP in mind the issue start happening under vacuum between -8 psi till I hit 0 and boost after that.
KEEP in mind the car run strong in boost.
I do smell raw fuel smell in the morning, no leaks what so ever, but this is a cold start operation and it is normal from my search,
My gas mileage sucks big time 12-14 MPG on a lucky day
The only thing left is see what is the gap size for the spark plugs running it with the dynatech arc-2 ??
Could the O2 sensor is bad and no "CEL" ????
ANY OTHER IDEAS PLEASE LET ME KNOW !!!!!!

 

do you have a log of it happening?

 

I have no way of logging anything, I am new in the EVO world, so I am just doing the mechanical portion of things. On my old DSM I used to have ECMlink, but now I am clueless as far what software should I use.

 

Tactrix Openport 2.0 for hardware and evoscan for logging. Openport 2.0 comes with ecuflash which in combination with the community available roms and xml's will allow you to tune the car yourself if you want. The openport 2.0 can also be configured to log to an SD card so you don't need to roll around with a laptop hooked up.


IMO its a tool every evo owner should have, doubly if you have a modded evo. Plus if you want to get into tuning the stock ecu yourself, or just increase your understanding of what tuning these cars looks like, this site has an insane amount of information, if you can slog through it.

 

I'll keep that in mind, so no modification to the ECU ?

 

Nope, its all code. If you are asking about logging then no you don't need to modify anything even in code to log, although there are some tweaks you can make to the mut table for better logging. If you start down that rabbit hole though you should just skip to the end and look into tephramod V7 which is a modified rom that ads cool features and turns the stock ecu into something pretty close to a stand alone.

 

Is this on 93 pump gas? All I can think of to check next is that some of your injectors are plugged where spray pattern is more of a stream instead of a mist.

 

Maybe TPS sensor is out of calibration? you could check to see if the base voltage is correct.

 

I am running 93 Octane, it is my daily "as much as possible", but I have been reading and doing research and it shows that .024 is normal gap for stock coils, but in MaPerformance website, under Spark Tech Coil on Plug with CDI
"The principal advantage of a capacitive discharge ignition is the ability to present a superior spark to the air/fuel mixture inside the combustion chamber thus maximizing burn efficiency. As most experienced tuners know the easiest way to get a bigger spark is to increase the spark plug gap size. However, increasing the gap distance has a direct proportional relationship to the voltage necessary to ionize the air/fuel mixture"
no one has the magic number for the gap when you call them, maybe one of the "Experienced Tuners" here can shed some light on the matter, or it just a myth to get you to buy the damn thing.

My goal is to have HI-Z injectors, and thanks to you guys I am able to learn about the evoscan and openport 2.0. I have my eyes on the FIC 1650cc, but I do not have the supporting mods for them.

So maybe I will send the stock injectors to cleaning to be done the right way not "homemade/youtube" cleaning services for the time being. Today in the morning the car was running very rough when I started it, but the soon I reved the engine, it started to run ok. It felt like the spark plugs were wet or moist from the gas and the extra push increased the spark from the Arc-2 to clear issue.

 

Running too rich will eventually foul your plugs. I gapped mine to 0.0020" to prevent spark issues but I've never experienced any before (even when I used to drop in plugs without gapping it so I don't even know what gap they are set to from manufacturer).

 

What mods do you have to need 1650 injectors?

 

I think when folks are asking about the ECU they are asking if you are 100% sure the ECU has not been modified prior to purchasing the car. If it was, then perhaps it might have used a Denso COP, which runs different dwell vs stock. If those settings were modified then perhaps does not have enough dwell for the stock coils.

Another issue I personally dealt with involved the OEM connectors that hook to the coils. They are not a sealed connector and over time that connection caused a serious misfire on my setup because of connector continuity issues. I ended up replacing the connectors with sealed connectors, which resolved the issue. However, I was also using aftermarket coils. Regarding plug gap you should be fine running stock gap as long as everything else is stock. With my coils I can run up to 36psi with stock plug and stock gap on 10.1 motor.

http://www.eng.fsu.edu/~jthagard/EVO...ils/issue1.AVI

 

That's what I have thought, I used to have 530 WHP AWD spyder eclipse before switching to the EVO world, so I have some ideas/knows little bit about high horse power application, I don't even thing I have even gape the plugs on the DSM. I did run the ARC-2 setup on the eclipse and it was all good.

 

That would be openport, evoscan, fuel rail, pumps, fuel lines "feed and return," intake manifold "maybe," find a shop/person who can take care of the car, and the MOST IMPORTANT aspect is money

 

I am definitely not 100% sure, because I can not get a hold of the guy who I have bought the can from, and the most interesting aspect is when I did the Crank Position Sensor, some one installed Gates timing belt in " the blue one"

for the connectors, I did build mime from all new plugs from the dealer and everything was solder on and used heat shrink and TRV for water proof results