raelph

the head gasket has a coolant leak into cylinder. NO water in OIL...very clean with head cover off. BUT getting head off without removing the block is a night mare.

Toyota Avensis verso 2003.  Any suggestions? please.

Intake manifold and timing chain assembly cover is very tight to frame will be difficult to remove, even if I get intake manifold off. I think there are tubes coming of intake manifold, so that could be trouble too. I don't know. See pics. i am almost there....just the manifold and cover assembly and the rest should be easy.

thanks

Raelph

OK I have changed the coils and spark plugs  and the Shudder is GONE....

But when I put foot to gas I get a NO explosion.

And car does not speed up. Then it starts again when gas is applied lightly.

Possibly the Fuel Filter. (o2 sensors still not replaced)

But I can't find anywhere where it shows how to replace fuel filter DIY. Any help would be appreciated.

thanks

Raelph

My 2003 avensis verso wagon is shuddering while idling.

It has trouble gaining speed and shudders intermittently while driving. 

Its probably a fuel problem, but mechanic wants $2000+ to change o2 sensors.

So i will do myself 

Possibly that will alleviate the problem, but more possibly not. However, sensors may help determine problem .

My question is ..there are 4 sensors ..two above cylinder 2 and 3 , i'm led to believe...and two below ( 1 and 4)

Internet suggests post CAT and Pre Cat sensors.

I assume upper sensors are pre cat.

But post Cat? Below. ? Is that correct? And just where is the Catalytic converter located? I thought it was just before muffler. But no sensors under car that i can see. Any help with knowledge is appreciated. Expensive even to install myself . Car is only worth $4000 max. So spending $2000 for mechanic only to find more problem ( fuel filter?) Really hurts