knanthasiri

So I got my 2014 e63s upgraded with the Weistec W.2 package (tune, downpipes, air filter, spark plugs) in November 2016. I had no problem at all for the first 5 months. Last night I was rolling at about 70-80mph and like most of you, I wanted to feel the power of this machine so I gunned it. Once I reached about 125-130mph, my engine started to feel "rough." My check engine light came on and flashed for a little bit. I let off the pedal and gently accelerated again and the engine still felt rough when I'm on the pedal. I pulled over and shut off my car. I restarted and it started just fine and the check engine light was out. Not really sure what happened the first time, so I gunned it again, but not as hard, and at about 110mph the same thing happened. The engine felt rough when I'm on the gas pedal.

I took it to the local shop that did the installation and when they hooked it up to their computer, it showed that there was a few misfire (can't remember which ones exactly).

I have not contacted Weistec yet but I was wondering if anyone else ran into this problem before?

Wickdwagon

How many miles before and after the tune? 6-8k miles is about what you should be looking at between plug changes post tune.....either that or crappy low octane fuel would be my guess....

Everyone with a tune should have the $15 OBDII bluetooth LE scanner off amazon, to pull their codes via your phone. You can leave it in all the time and connect your phone whenever you see fit?

CarHopper

As wicked said, you need new plugs. Not a Weistec thing, it's a wear thing. Replace plugs and you should be good to go. Coilpacks wouldn't hurt either.

PeterUbers

If it's plugs you really didn't get much mileage out of them .... 5 months?

kponti

I put over 12k miles on my plugs and changed them out recently. No issues with gapped down stock plugs for over 12k miles. Weistec plugs might not be holding on so well if that's the problem

CarHopper

I bet I could blast through plugs in a month on a tune. It's all about how you drive / mileage you put on them.

PeterUbers

makes sense

Geno51

For sure plugs !!! Misfires on our cars is 99% the plugs and 1% the boots. I just went through this myself changed my plugs 3 times in a week to get my misfire issues fixed. Then changed the boots. My misfire went from cyl 1 to cyl 2 to cyl 5. We had to do all new stock plugs and new boots with dielectric grease on all cyl to fix the issue. Then under heavy load cyl 2 misfire reset the boot and it went away. Only other possibility is the tanker that filled your gas station put the wrong fuel in the premium tank hate to say it but this happens more then it should. Replace the plugs if this does not fix the issue. Put 3 gallons of 100 octane in the tank. It's not the tune.

knanthasiri

I'll give that a shot

Thanks for the info

Luke-BITURBO

I hammer the **** out of mine standard plugs 25k miles on the car probs 6k miles tuned plugs are ok ATM

ajs76

Do you have a favorite scanner? I was thinking of the bluedriver one, but it's 100 bucks so just getting to the price where I think I should do some comparison shopping.

OP - Is the car fine around town?