PDA

View Full Version : Car acting crazy need help!


Jfierro2010
03-09-2013, 09:15 PM
Soo my merc is acting dumb. When I floor it rpm will jump and just drop and jump back up again. If its like its not breathing right or gasping for air. Have a cold air intake now and doesn't do it often but still does. Some guy said it feels like the transmission is disengaging. Also I have to hit my traction control switch off or it wont go past like 30 or 40 mph. It thinks its loosing traction

Note II using tapatalk 2
gdsqdcr
03-09-2013, 09:21 PM
Check your tire sizes. If your rear tires are not larger than the front, the car will act like you at describing. If I recall correctly, 3% is the require difference in tire size.

I had a mechanic work on mine and as a favor, rotated my tires. It did exactly what you R describing ...

Anthony
Blk04MM
03-09-2013, 09:24 PM
Go outside check your tire sizes front and rear then report back
Comin' in Hot
03-09-2013, 09:30 PM
And look at all four tire sizes not just one side
Jfierro2010
03-09-2013, 09:45 PM
Oh no I has 22s before and this happened. Now that I bought some factorys (and my tires on rear are smaller) all the lights light up.but ima tty it tho

Note II using tapatalk 2
gdsqdcr
03-09-2013, 09:47 PM
Oh no I has 22s before and this happened. Now that I bought some factorys (and my tires on rear are smaller) all the lights light up.but ima tty it tho

Note II using tapatalk 2

Smaller tires bong on the front, not the rear.
Blk04MM
03-09-2013, 09:50 PM
Oh no I has 22s before and this happened. Now that I bought some factorys (and my tires on rear are smaller) all the lights light up.but ima tty it tho

Note II using tapatalk 2

Even with 22s I suppose you still need a "rake" to keep TC happy. Far as factory wheels the two taller tires need to be on the rear.

Someone here might chime in with all the specs
SC Cheesehead
03-09-2013, 10:01 PM
Even with 22s I suppose you still need a "rake" to keep TC happy. Far as factory wheels the two taller tires need to be on the rear.

Someone here might chime in with all the specs

Has to be between a 3% and 6% difference in tire height between fronts and rears, with e rears being higher.
Blk04MM
03-09-2013, 10:07 PM
Has to be between a 3% and 6% difference in tire height between fronts and rears, with e rears being higher.

There u go, More info to go by. Swap your tires then give it a go see if it fixes your issue
Jfierro2010
03-09-2013, 10:21 PM
The reason I put the small it the back bc when I bought the rims off another mm owner I put tge wide wheels on the back and I was gonna replace them whith fattrr tired later. Thanks guys! Any suggestions on my first problem? Before the traction question

Note II using tapatalk 2
Blk04MM
03-09-2013, 10:33 PM
The reason I put the small it the back bc when I bought the rims off another mm owner I put tge wide wheels on the back and I was gonna replace them whith fattrr tired later. Thanks guys! Any suggestions on my first problem? Before the traction question

Note II using tapatalk 2

So you have widen rears on your car?

And the proper tire size may fix the issue. If not then someone else can help
gdsqdcr
03-09-2013, 11:58 PM
The reason I put the small it the back bc when I bought the rims off another mm owner I put tge wide wheels on the back and I was gonna replace them whith fattrr tired later. Thanks guys! Any suggestions on my first problem? Before the traction question

Note II using tapatalk 2

The proper tire size may fix the rpm issue as well. First suggestion, get the tire size correct, then take it for a test drive. Report back after that.
Jfierro2010
03-10-2013, 12:19 AM
10-4 guys. Tomorrow morning I will do that after work

Note II using tapatalk 2