Reduced Power Under 2000 Revs

nizmo · August 13, 2015

Hi guys, i own a IS220D 2010.

last week while driving the car the management light came on, car suddenly lost power. After taking it to a local garage they diagnosed it with error P0400 egr valve

they advised to clean the EGR valve. after having this done, I took the car back no more engine management light however the car has no power under 2000 revs. once it hits 2000+ the turbo kicks in and the car pulls. this is occurring in all gears. i took the car back and the guys took the EGR valve off to re-check it. confusingly there was more soot on there. not as much as the first time but they were concerned that it shouldn't have been that much.

Another thing i have noticed is that when the car is turned off the engine kinda shakes the car. hard to explain.

So I took the car to lexus who said as they cannot read any error codes they have nothing to work with, they even took the EGR valve off and confirmed it was cleaned. They advised me to keep running the car until the light comes back on. To fully diagnose the car they said it would be costly??

i know Shahpor who has a similar issue. just wanted to see what everyone thought.

ps. this car had a blocked DPF last year and it was cleaned out by Lexus. That time the limp mode it was in was different there was no power what so ever and wouldn't do more than 40mph.

ahmedali44 · August 13, 2015

It is possible that dpf is blocked again what sort of milage u do mine used to shake when switched off when lights came on had dpf cleaned now no shake or could try putting dpf cleaner and take it for a run in 4th gear upto 50-60 mph for 10-20 mins should clear soot might do trick good luck

zoran · August 13, 2015

I would think t could be an injector problem,i have the same problem with mine

Shahpor · August 14, 2015

It does sounds similar to what I am experiencing. Like mentioned above, have you had a blast to see if it helps? Most of my usage is on the motorway over 2000rpm, so I am thinking the problem with mine could be somewhere else.

Have you checked the air and fuel filters? Lexus recommends changing the fuel filter between 50,000-70,000 miles, but mine has a full Lexus history and there is no evidence it has been done.

So, as per my thread, I am changing both to see if it helps. Will report back results once it is done.

Also, what kind of mpg are you getting?

nizmo · August 14, 2015

Car gets driven everyday with a mix of local and motorway. car does around 36mpg average.

how would one know if the EGR is faulty? is there a way to test it?

i haven't checked the filters. i wouldn't know how to check the fuel filter. The has done 48K and has a full Lexus service history., next one is due @51K.

Shahpor · August 14, 2015

Well, I am no expert, but I assume they cleared the error code last time? If so, have you checked to see if it has come back since you cleaned it? To me, that would point to a faulty egr.

You wouldn't check the fuel filter, you would just replace it. The problem is, while the filter itself is cheap (Lexus charged me £18.50 inc VAT for it), it is awkwardly placed, so best to find a friendly mechanic to change it for you. Mine is quoting about £40-50 to change it.

nizmo · August 15, 2015

No more error codes. even checked with my cheap scanner. I might just get a second hand EGR valve and replace it as it's probably the cheapest option right now. after that I am not sure what to do.

Shahpor · August 16, 2015

Well, unless you are really unlucky, another EGR valve should at least prove that that isn't the cause.

Perhaps your fuel filter is blocked? Also, check your air filter.

Failing that, perhaps one your fuel injectors is blocked? Also, despite the fact it should throw up an error code, you might want to give the air flow meter a clean.

Since the problem started, does the car smoke at all?

Not sure about this, but I have heard (perhaps incorrectly), that some of the cheaper code readers don't read all the codes. I would recommended something like what IS200D told me:

http://www.lexusownersclub.co.uk/forum/topic/102540-is220d-fuel-issue/?p=924467

nizmo · August 20, 2015

Hi Guys, quick update from me. My problem has been fixed. issue was a faulty EGR. I ordered a used EGR from eBay and replaced it myself. Power has returned to normal, the car shake has gone. sounds and drives like new.

here are some pictures of the old EGR clearly there was an issue which you can see in the picture. what I am more annoyed about is that the garage that cleaned the EGR out didnt notice this. or they caused the damage when cleaning it. who knows.

The gap possible would cause vacuum issues within the engine thus giving me the issues i seen. what do you think?