HELP - Strange Power Loss
 

I have a 2005 xB with a manual transmission. I have been experiencing a strange
power loss that feels like the car is going into limp mode. It happens every time
I take a certain freeway cloverleaf ramp. It’s an up hill right turn at about 40 mph.
The car just looses all power and will barely hold 10 mph and wont go over
3000 rpm. After an hour it will sometimes run normal. I have replaced the fuel pump
and strainer. Checked the fuel tank for foreign matter/debris. I have replaced the MAF
sensor. If I park the car down hill and turned off, it has gone back to normal within
a few minutes on two occasions but not always (coincidence?). There are NO codes
or warning lights of any kind. I have about 110,000 miles on the car and it has always
run strong. My mechanic and I are out of ideas. I have driven it over a hundred miles
testing in every cornering condition I can find after the MAF replacement without
problems and then this morning it died again.

ANY IDEAS?

(and I don’t need the comment of “just don't take that off ramp”, it’s how I get to work)

Yeah, dont take the offramp. Duh...

hahahaha just kidding. It is weird that your are going into limp mode with no CEL lights of any sort. Maybe check for codes anyway? Or also check your intake and make sure it isnt blocked by anything. MAF was the problem when I last went into limp mode. 3000RPM limit is a pain. I had to buy a brand new one.

any other Idea, my 06Xa has the same prob... going on the ramp, all power lossed, its like beening in "N", I step on the gas and the eng just revs up... pull over to the side, trun off the car for few min, start it back up, all isfine... so far.

need Help..
Keith.

the xa sounds like it may be low on trans fluid. if the engine is racing and the tranny is in gear then something is slipping

Thanks... I'll Look into the MAF and trans.. hopefuly it's one of them.

Keith..

I had an issue like this on my mustang once and it was my Throttle position sensor. I don't know if our scions have one of these but mine just needed to be cleaned and this problem stopped. Maybe you can check on this?