2001 Solara bucks at WOT - Toyota Nation Forum : Toyota Car and Truck Forums

wills55 · 08-08-2011, 06:10 PM

Ive been fighting this car for quite some time now and after plenty of money and more aggravation than I care to remember I still have an issue.

I can drive this car at any throttle smoothly other than WOT. That means exactly what it says. You puck the gas pedal down at any level other than floored and it drives fine. If you floor the pedal it bucks and kicks like its choking. Ive got no codes and the tank is full. Any ideas?

***Eye8Pussies*** · 08-08-2011, 08:36 PM

what have you done so far in terms of diagnostic when you say that you've spent money trying to fix this problem?

have you looked at the ignition system, fuel system, or air going in?

wills55 · 08-08-2011, 08:48 PM

Ive done the basic maintenance thats supposed ot be done. Plugs, wires, cleaned the throttle body, new air filter, made sure that there are no vacuum leaks, new PCV, new air fuel sensors front and rear, and verified that the MAF meter is working properly. I have a 99 Avalon that I borrowed the MAF from to verify. Ive got no codes though wich is the most frustrating part. You would think that with the way the car bucks and kicks it would give me a code. No such luck. Its driving me friggin crazy. My littel sister drives this car back and forth to school/work and her semester starts very soon. I need this thing to be reliable again so Im not worried about her getting stranded on the side of the road at night.

***Eye8Pussies*** · 08-08-2011, 10:51 PM

can you verify that it does it only at WOT, or it does it any time that it goes into open loop (because you don't necessarily have to be at WOT to go into open loop)

wills55 · 08-08-2011, 10:55 PM

Ive verified that the car does in fact go into closed loop and that this crap only goes on when I try to go WOT. The car does it no matter what. Open loop...it does it. Closed loop....it does it. Any other measure of throttle pressure I give it and this car drives like a dream. If I try to floor it, as soon as I get the pedal to the floor, it starts with the rodeo...

***fenixus*** · 08-08-2011, 10:59 PM

you checked pretty much air intake stuff and spark side. how about fuel delivery? maybe fuel filter is old and restricts free gas flow when car needs it most?
when was it replaced last time?

also, you might wanna take a look at the Throttle Position Sensor, perhaps it's misbehaving at WOT?

wills55 · 08-08-2011, 11:02 PM

Damn, forgot to mention that in the first post. Its got a brand new Toyota fuel filter in it too. Thats the last thing I did. Just changed it last weekend Sunday.

***fenixus*** · 08-08-2011, 11:06 PM

all right. have you by any chance checked the fuel pressure at filter outlet?

how about fuel injectors? ever removed and cleaned? have you tried pouring Chevron Techron concentrated fuel system cleaner, 1 big bottle (20oz) or 2 small ones (24oz) to half full gas tank?

Quote:

Originally Posted by wills55

Damn, forgot to mention that in the first post. Its got a brand new Toyota fuel filter in it too. Thats the last thing I did. Just changed it last weekend Sunday.

***fenixus*** · 08-08-2011, 11:09 PM

also one more thing, does it always happen above certain RPM speed or at WOT no matter what engine speed? what happens if you floor it at highway speeds?

and lastly, when was the transmission fluid (and differential) changed last time?

wills55 · 08-08-2011, 11:09 PM

Have not checked pressure at filter outlet or removed or cleaned injectors. Just a thought...If the pressure was low, wouldnt I see a problem at part throttle? If injectors were blocked, dirty or clogged wouldnt there be an issue I would notice at part throttle?

wills55 · 08-08-2011, 11:11 PM

I was typing while you were lol. Now that you ask, seems that its only at WOT not matter engine speed or vehicle speed. back roads, highway, 40 mph...doesnt seem to make a difference.

***fenixus*** · 08-08-2011, 11:13 PM

well it depends, too low fuel pressure or partially clogged (dripping pattern instead of spraying) injectors *could* affect idle, but ECU is smart and compensates a lot of things and it won't throw a code until the adjustments exceed certain ranges (quite broad if you ask me).

at WOT you engine needs EVERYTHING at max which is obviously a problem. you just need to isolate the problem to delivery of either spark, or fuel or air or transaxle slipping for example.

it would help you A LOT if you had an OBD2 scanner being able to tell you live engine parameters, like TPS, MAF, fuel trims, oxygen levels, engine load, etc.

Quote:

Originally Posted by wills55

Have not checked pressure at filter outlet or removed or cleaned injectors. Just a thought...If the pressure was low, wouldnt I see a problem at part throttle? If injectors were blocked, dirty or clogged wouldnt there be an issue I would notice at part throttle?

wills55 · 08-08-2011, 11:16 PM

Is it a bitch to pull the injectors?I know the front rail is easy enough to get off but the rear rail is under the manifold isnt?Also, how do I check fuel pressure at the filter oulet? Do I need a special tool (please say no lol)?

***fenixus*** · 08-08-2011, 11:21 PM

does it by any chance burn some oil? dirty exhaust tip?
wondering if that maybe is a sign of catalytic converter getting clogged if all else is in order ...

... but check the TPS sensor first.

what brands & models of oxygen/AFR sensors and spark plug and wires did you put on it?

Quote:

Originally Posted by wills55

I was typing while you were lol. Now that you ask, seems that its only at WOT not matter engine speed or vehicle speed. back roads, highway, 40 mph...doesnt seem to make a difference.

wills55 · 08-08-2011, 11:25 PM

Bosch sensors IIRC. Also, Ill pull out of the driveway and hammer it trying to go down the street, it will do its dance then I turn around at the end of the street and pull back into the driveway. There is a pretty distinct catalytic converter smell going at that point. You think it could be a clogged catalytic converter? If thats the case Ill cut that sucker out and weld a test pip in there.