need help for a shaking 97 avlon

[ly2340]

hi to all ur expert.
i've got a problem with my 97 avalon [401000km] ,i replaced 2 knock sensors,new spark plugs 2 mths ago,now i get a code p0446.here is the problem,while i was driving few days after replacing knock sensors,the car suddenly shaking like crazy for a minute or 2,[it never happened before],so i change trany fluid [got from dealer],for 2 wks it's very smooth.this morning,the shaking happened again for about 2 -3 minutes,i had to stop the car.then i scaned after came home,there is no other code ,only p0446.does anyone have any idea about this problem?will that relate to the knock sensors,or spark plug [i use the single ground instead of double.i had the single ground all the time],any suggestion would be very appreciate

[Jack Deth]

just a shot in the dark... maybe an intermittent coil.

[GOT BOOST]

Originally Posted by ly2340

hi to all ur expert.
i've got a problem with my 97 avalon [401000km] ,i replaced 2 knock sensors,new spark plugs 2 mths ago,now i get a code p0446.here is the problem,while i was driving few days after replacing knock sensors,the car suddenly shaking like crazy for a minute or 2,[it never happened before],so i change trany fluid [got from dealer],for 2 wks it's very smooth.this morning,the shaking happened again for about 2 -3 minutes,i had to stop the car.then i scaned after came home,there is no other code ,only p0446.does anyone have any idea about this problem?will that relate to the knock sensors,or spark plug [i use the single ground instead of double.i had the single ground all the time],any suggestion would be very appreciate

Here you go!

http://www.obd-codes.com/p0446

[ly2340]

Originally Posted by GOT BOOST

Here you go!

http://www.obd-codes.com/p0446

thanks for the link.but i just worry about the Shaking,any other suggestion?thanks

[HATEnFATE]

Do you feel like you lose power when the shaking starts?

[ly2340]

Originally Posted by HATEnFATE

Do you feel like you lose power when the shaking starts?

that's right,it seemed like no power at all

[GOT BOOST]

Originally Posted by ly2340

thanks for the link.but i just worry about the Shaking,any other suggestion?thanks

Look for vacume leaks around where the code is centred.

[HATEnFATE]

If you're also losing power, i'd look at a few diff things.

Check your throttle body. It might need to be cleaned. Mine was nasty and because of the gunk, it would stick a little when it was raining or really humid and cause a similar issue to what you're having. It would even stall every now and then.

Check your ignition componants. Get OE, Dual ground plugs for your car if you're not running them. You might have a coil going bad. If a coil goes, you lose 2 cylinders and your car will run like crap.

[GOT BOOST]

Originally Posted by HATEnFATE

If you're also losing power, i'd look at a few diff things.

Check your throttle body. It might need to be cleaned. Mine was nasty and because of the gunk, it would stick a little when it was raining or really humid and cause a similar issue to what you're having. It would even stall every now and then.

Check your ignition componants. Get OE, Dual ground plugs for your car if you're not running them. You might have a coil going bad. If a coil goes, you lose 2 cylinders and your car will run like crap.

If you lose a coil there will be a code of misfire detected in cyl # XX.

I agree on the throttle body clean and check the grounding. If it is stumbling I would check for vacume leaks related to the error code first. Vacume leaks can wreak havoc on OBDII Equiped vehicles.