IT also drive fine normal. but soon as you try to get on it. no power, and the higher the RPms climb the worse the misfire sound gets. very strange. It almost sounds like a spark, ignition, fuel issue, FYI im using GTR injectors 570cc and they were at 75% duty cycle which i think is a lot., and the car still mage no power. AFR were still a touch rich but still no excuse for the lack of power. so my guess it is the coils. what do you guys think? any one else with some ideas?

 

any codes stored?

 

yes some strange ones. that i cant seem to find the answer to..
p2a00 bank 1 sensor 1 range performance
p2a03 bank 2 sensor 1 range performance
p0138 o2 sensor circuit high volts bank one sensor 2 (i only get this one sometimes)
Also gas mileaege is garbage

possible causes.
exhaust leak. checked, found nothing
Bad A/F sensor in Manifolds
Bad MAF.. but no codes for that


Other than that i dont know. i checked everything else accept the coils. those should be here tomorrow and ill put them in the suspected bad cylinders. What do you think?? maybe a bad MAF- a little story behind that. When i put the motor together i wanted a new BOV and also wanted to get rid of the mess of couplers where near the BOV and MAF so, i had a new BOV flange welded in and my MAF housing welded in to a aluminum pipe. Now i have no couplers accept the one that connects the pipe to the intake throttle body. Could it be that the MAF was messed up? or that the housing wasnt welded in there correctly, meaning not straight, hense throwing the code? i know the MAF is installed the correct way but it is slightly cocked so it isnt getting the air reading perfectly? Its so slightly off to be perpendicular to the tubing that i would think that it would not matter, however i can be wrong. Any one can shed some light on this? THANK YOU!

 

NOTE: I do not have any misfire codes and no flashing CEL.

 

you sure you have the correct connectors going to the correct coil?

 

positive, other wise it wouldnt run right at normal driving, UPDATE. Driving normal the car is sputtering/missing now-still no missfire code. its very slight but i can feel it.

 

Sounds like an ignition/coilpack issue? But it dosent do it at idle? If it did it much easier to find by unplugging the coils one at a time. Change each coil out one at a time go for a drive if it still does it put the old coil back and try the next one.

 

yea im going to give that a try. ill update when i get them in. thanks

 

Hey, 1st off I saw you were selling your UTEC on the other forum cause you were running with Haltech, what happened there, the Haltech wasn't working?

I've currently got the UTEC on my turboneitcs G as well. I left the dyno only putting down 305/305. I have an HKS Ignition amplifier but haven't installed it yet. But I also have the sputter above 4500. The transition from the MAF to the MAP happens around 3000 RPM and I get a bit of a rough transition too, but I have the higher RPM issues as well. Initially I found out I had grounded the unit wrong, and that had helped a bit, but still has the hesitation or power drop, and it sounds like **** in WOT... interesting none the less..

 

i had a bad haltech. wouldn't let me rev past 4500 (software issue) it was warranty but didnt decide for them to replace because it would take 4 weeks, so i was refunded. i switched to Osiris because of the cipher and all diagnostic capability. UPDATE: replaced coil and it still does the same thing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!! im really losing my patience with this car....... its so aggravating..... i made more power on my blown motor with a head gasket leak than this!!! and i dont want to keep pushing it till it blown again!! could it be a bad maf?... anyone else?

 

something strange happend today. i got a bank 2 rich code. never got that before and a p0300 randon multiple misfire. never got those before. the only thing i did was open the coolantvalve for the MREV lower plenum to the throttle body. i reset it can it came back on in a few minutes. i reset again and i never came back. could it be that coolant was getting in the cumbustion becasue i opened the valve?

 

bump.

 

if the valve you are talking about is the motordyne CCV, then it will have no effect

have you tried putting your stock injectors in? they are what, 330cc? I would test those out by putting them in and seeing if the car runs normal. Obivously keep it safe so as not to toast the motor from lack of fuel.

Sounds to me like you are getting TOO much fuel.

Maybe try doing a compression test as well, make sure everything is sound with the build.

 

I did do a compression test everything is perfect. To rich? Yes, that is the valve I'm talking about. What would the p0300 come from? Hmmm. My wide band is reading almost 12 at wot. That's the strang part and the injectors, which are 570cc, are runing at a 65-70% duty cycle- the car only made 285 whp. It almost feels restricted. Could it be my MAF or a bad primary 02?

 

Bump.