For some odd reason, all of a sudden, my car revs very slowly after 4k rpm. it feels like the fuel is being cut off. This car does not accelerate after 4k!!!
I mean it i don't know how to explain it. this is right after a oil change. I was thinking maybe a vacuum leak somewhere or a fuel pump problem or maybe just not enough oil or a poor grade oil was used???? Maybe my UTEC is acting up?? Help me!!!

I need suggestions guys. Thanks

 

anyone??

 

Youve got a lot of parts on there, could be a number of things.

When you say it wont accelerate, is there any sputtering or noise?

 

it revs up real slowly after 4k. no unusual noises or anything

 

ECU in "Limp" Mode?

 

4k and up is pretty near the threshold a UTEC would "take over". Have you tried reloading your tune map to see if maybe this got corrupted?

 

yeah..re-tune

 

Did you ever figure out what the problem was?

 

still running like **** but after the car really warms up, it runs fine. I'm so confused.....Maybe fuel pump, a bad injector, spark plugs. But it didn't throw any engine codes so I'm puzzled

 

MRC tuned the car, right? Did you ever bring it back to them so they could take a look?

 

did you use the right grade of oil? im wondering if you dont have sludge somewhere in there, or maybe your oil is the wrong weight. that would explain why it runs fine when it warms up.