A Real Challenge...strange One

[indybutts]

Hello everybody as you may have guessed I am looking for some help with a strange problem with a 2002 avensis d4d.

When I go up the gears from 2nd to third the car feels as if it is hanging itself and then it seems to clear and all seems ok for a while.

The best way I can describe this would be it feels like the turbo has monentarily stopped working.

Now here is the strange thing...this happened in the past and a mechanic I know bypassed the fuel filter that is on the bulkhead and the car goes like a bomb,no problems with hanging at all...but I know this is not a permanent solution, but without that bypass the car was undriveable.

Ok like any normal person I thought the problem was with the filter itself, i changed it to original Toyota but it didn't cure the problem.

Then I changed the housing that sits on top of the filter that has the inlet and outlet pipes, as far as I am aware there is a heater on that housing...I didn't change that because I was told it wouldn't help, and it was costing £85.

I told you it was a strange one...any help would be appreciated.

Thank you

[Druid Boy]

Wierdness. I'm stumped. In the absence of other specific replies it may be worth asking your mechanic who bypassed the filter his opinion. Seems he knew of a reason to bypass the filter so perhaps he can help to remedy it?

[indybutts]

Thank Druid, we have eliminated all the usual suspects, even had the fuel tank out in case it was an intemittant blockage, but still no resolution, I went through some of the replies to other posts especially one entitled turbo cutting out, but their resolution was already checked by mechanic.

I am convinced it is not a turbo problem but more of a fuel problem, but cant seem to get to the bottom of it.

Like I said I have replaced the filter housing apart from that little bit that I have been told is a heater, does anyone know if that in fact IS a heater or does it do something else that could be adding to the problem.

Like I said bypassing the fuel filter eliminates the problem completely.

Thank you.

[Druid Boy]

Never heard of a heater on a fuel filter before and can't think why you would need one. They do have a sensor that detects when there's too much water and crud in there I think. I wonder if it is something else that is operating poorly and cannot overcome the resistance the fuel filter introduces. I know that SCVs cause problems similar to yours (Suction Control Valves). I thought mine were on the way out but a new fuel filter cured it. Thinking about it now it kinda makes sense that the SCV may be your problem. Too little suction = loss of fuel = loss of power. Remove filter = less resistance = easier to suck fuel through. Kinda makes sense.

Unfortunately I have no idea how to test the SCVs but I do know they are expensive to buy so, unless you have a friend with the same car who is prepared to lend you his SCVs to do a trial I'm guessing it's a trip to a specialist to do a diagnostic for you.

Let us know how it goes.

[indybutts]

Thanks Druid

[indybutts]

Hi Druid have you any idea where I might pick these up online...anywhere you would recommend?

[Druid Boy]

I think guys have found them on eBay but I don't know whether they were new, used or had any guarantee. You could give Parts King a private message and see what price he can do but as I recall we are talking a few hundred quid so if you can get them tested first I would. Flippin expensive thing to change if they don't solve/aren't the problem.

[t-spiritpete]

Hello,

here is how to test the scv, just click on the drawing to make it easier to read :-).

Regards Pete.

[Parts-King]

PM Me for prices, we keep them in stock

Kingo

[+robster+]

hope your gonna check/clean egr before spending money

when this sticks you lose turbo pressure and it feels as if you have pulled on the handbrake quite sharply