Lexus is 220d acceleration problem

[lastanimir]

Hello! I have a problem with my Is 220d. 
The car accelerates very slowly.  No errors were recorded.  The DPF filter has been removed.  EGR too.  The car has a remap but that doesn't help either.  Go for a maximum of about 140 hp (about 210 should be).  Any ideas?

[08ISF]

Hi,

I'm no expert  on diesels but your post has raised some questions; Were the DPF/EGR removed  and remap done to try and cure the slow acceleration problem or did the problem occur after they were done? if it occurred after ,then they are most likely the source. Lexus cars do not take kindly to fiddling and from what I've read remaps are problematical as the software is protected to prevent it.

Have you got good compression on all cylinders?

This particular model wasn't the best Lexus ever produced. Have a look through this forum for a run down of all the problems owners have experienced. If you want 210hp out of a Lexus IS then best get  a petrol IS 250.

Any help?

[lastanimir]

The compression on all cylinders is very good. Acceleration was very bad before the DPF and EGR were abolished. After removal and remap the acceleration improved but not completely. 

[08ISF]

Air flow meter in good condition and sensor clean?

[lastanimir]

Air flow meter is in good condition and the sensors have been replaced with new ones

[08ISF]

I'm out of ideas, but you do realise you could get a £1000 fine for running around without a DPF?

[lastanimir]

I don’t live in England and here almost all cars are without DPF and there are no problems. 

[NemesisUK]

Why put London as your location then?

[Mihanicos]

Check the fuel injectors and the carbon built around the inlet valves.

You should be doing an inlet valve cleaning once a year using special cleaners sprayed into the inlet manifold.

If your inlet valves are heavily clocked you may have to use wallnut blasting or clean them with chemicals.

Chris.

[lastanimir]

Fuel injectors are in perfect condition. When the car accelerates quickly and change the gear the car starts to accelerate again after 1-2 seconds. 

[Beamish]

 

Try running it with the MAF disconnected and see if there is any improvement in acceleration.

[lastanimir]

Should I take the jack out and drive like that? Won't it record an error?

[Beamish]

Yes just unplug the connection and take the car for a drive. The ECU will revert to default settings for the MAF. You should notice any improvement in performance fairly quickly which would point to a problem with your MAF sensor.

I'm uncertain as to whether or not it will turn on the engine management fault light.

[Yorkie740]

I had this very same problem and it ended up then the turbo actuator!