Morning guyZ,

I have a 04 6mt Roadster, recently i have noticed that when i am driving at low rpm's and and hit the gas the car hesitates and continues to do this until about 4K if i down shift its not so bad but still noticable. Any ideas what it is? do i need to reset my ECU? Anyone else have this problem? clutch maybe? the only mod i have is a popcharger. thanks in advance for any help.

 

yea i kinda feel this too.

no idea why?! i have heard all sorts of things such as dirty filter.. but i dont think it could cause this?? no idea

i have also heard to change the DIFF fluid.

so im gonna go clean my filter this weekend and change my DIFF fluid with some amsoil and see if it helps any! will let you know if it does!

 

im having the same problems

 

I recently just started having this problem. It's happened to me three times so far. The first two times happened under normal driving conditions. The third time happened while opening the throttle competely. I've been searching this site for answer but nothing confirmed yet. So far i'm reading that it could be spark plugs. I hope thats the case, since i'm going to be replacing those in a couple weeks anyways.

 

im starting think its the plugs also. today i started my car and started driving and it was acting like it was misfiring when it was cold, no codes but motor was running rough and rpms were jumping all around while the motor was shaking badly. once it was warm it ran fine but every once and a while it would have no power at low rpms, mostly little after i started it after its been off for about 20 min. also its been about 30 degrees out but also colder and the car ran fine, so idk if temp has anything to do with it. the other day i thru codes 0132 and 0152 for 02 sensor 1 banks 1 and 2 running rich. the car sat overnight and started it up in the morning and ran fine and had no codes.

 

You may want to check for a clogged cat. If you have a bad catalytic converter you will lose power. Also check the obvious, plugs and coils because those are often a cause of the problems you guys are having. Unfortunately, it is a pain in the a$$ to get the plugs out, about 45 min job.

 

You fix this problem with a software update to the ECU. You will need help from the dealership to do this upgrade. If you are under warranty, the software update is installed at no charge.

--Spike

 

i just changed the diff. fluid about a month ago before all of this started. i really dont think that that would cuz the motor to have no power unless some how it was messing with the traction control and blogging the motor down.

 

forgot to mention that i have no cats.

 

i might be wrong but if its a problem with the ecu needing updated wouldnt the car have no power all the time at low rpms until it hits 3 or some times 4000 rpms? i only have problems mostly when the motors is cold or little bit after start up after i leave the store, but the motor is still some what warm.

 

What other mods do you have?

 

just aftermarket down pipes and short ram intake. both been on before i bought the car and i had it for 8 months. last month i made a custom axle back exhaust but thats all.

 

it happened to me during cold weather. i'm running nismo cai, plenum spacer, and test pipes. i just switched out the air filter and diff fluid. the weather has gotten a little warmer. so far it hasn't happened again. i'm planning to change my spark plugs, so i'll check if there is any build up on them. (just doing some of the 60k maintenance stuff).

would getting an ecu update be any problem with me having test pipes? would it be necessary for an 06?

 

Jon, the first thing I would check is the exhaust system. Make sure it didn't generate any leaks that could cause the O2 sensor to trigger a richening map. This will be at the front of the system near the two exhaust sensors. Also check the new axle back for restrictions that may have developed after installation (check the resonators as well). Bad news it kinda tough to check for restrictions in the system without removing them. I've heard of one way dealing with the vacum lines and the amount of pressure generated being higher than standard but I've never used the method. You can find that method by doing a basic internet search for detecting exhaust restrictions.

 

Abo, I'm not sure if the test pipes will cause a slightly different mixture on their own. Since the AF sensor is ahead of the cats and the O2 sensor is only in the first stage of catalyzation it could go through without a hitch. But knowing the ability to get exhaust gases out quicker suggests a leaning out of the mixture and thus the ECU wanting to richen up the mixture prematurely. But that is limited by the flow of air through the system. So after everything said and done.... I'm not sure.

 

thanks, im gonna change the plugs out today just to see and they should be changed anyways. if that doesnt work then i bolt the factory exhaust back on.

 

i just got down changing the plugs and noticed the throttle body is black inside and all gumed up. gonna clean that up and see how it runs. had the car out earlier and it ran normal. its also 20F outside and snowing. but i also let the motor run for about 10min. before i drove it. i hope this fixes it but i wont now for awhile.

 

If you clean the thottle body make sure to do the re-learn proceedure. It actually may help you anyway.

 

hmmm... i just had the intake off this past weekend i don't know why i didn't think about cleaning the throttle body. looks like its just one more thing to add to the list next saturday.

 

wats the re-learn procedure?