is this the end, power loss no boost after 2000 revs until 4000 revs d4d 1cd-ftv

[avensisd4d786]

so its hit 200,000 miles. its developed power loss, hard to reach 60 when joining motorways.

so far i cleaned EGR, its nice and free

changed maf sensor purple sticker one.

change vacumm sensor orange one sits on top of cam cover.

no smoke- engine oil level is ok

its like there is no boost between 2500 and then at 4000 there is a sudden boost.

can someone help.

anyone local to north east to have a look

 

avensis 2.0 d4d 2004

[Cyker]

I wonder if the variable vanes on the turbo have gotten stuck open or something? Or the thing that actuates them?

[Amateurtorque]

I haven't had this problem myself, however I have read in Diesel car magazine someone had the same problem so they tried Wynns turbo cleaner, and it freed the vanes. I think it's the cheapest option to try first.

Matt

[Bomber209]

Hi, my first thought was Turbo. As said previously it sounds as though the variable inlet vanes are sticking. Using a cleaning agent will give off some smoke for a short while until it burns off. With the vanes stuck 'Open' the turbo is gulping a huge amount of air, but the exhaust pressure is not strong enough to make any use of it. I don't know what car have, but also check inlet pipe from intercooler, as it could be blocked. Also check Intercooler not blocked. Good Luck

[avensisd4d786]

changed fuel filter no joy

changed SCV valve

not got round to intercooler pipes or intercooler its self

really bad on mpg too

[frankie406]

All hoses OK and no splitting on them? What way does the engine sound is there loud hissing? Also the egr may well be "nice & free" but that doesn't mean that it's working? Try the turbo cleaner it's a cheap option as said..

[avensisd4d786]

intercooler changed, throttle body/flap motor changed both intercooler pipes changed, check all vac pipes still no joy tried cataaclean too.

very bad on mpg too only getting 300 350 miles to tank

[avensisd4d786]

UPDATE GUYS- unplugged maf sensor car runs much better,I did change the maf with a used one 

[m456an]

I would check the air flow with torque pro of both maf sensors old one and bought second hand one...