Is200 Power Loss

[Is200Sully]

Hi, I've a 2002 is200 sport have it a couple months now and was going great passed nct and all recently but the last 3 weeks it has lost power one day it could be going great and next you could be driving away hit 4000 revs and its like the car bounces back with no power even very sluggish driving anyone any ideas what the problem may be???

I got a computer diagnostics done by my mechanic and was all fine,

He checked the Cats they are fine and he doesn't see what's wrong

Anyone any ideas?

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[steve2006]

Any unusual smoke from the exhaust when the problem occurs?

[Is200Sully]

No smoke and car idles perfect and wen parked will Rev up fine but once I'm driving it won't Rev up, even if I tried to throw the car out we'll say drift it, the car just Boggs down oil level is perfect not burning a bit, I'm drove mad trying fix it

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[clifton 94]

Have you checked the small oil filter in the banjo where the oil pipe goes into the vvt at the top of the engine just a thought might be stopping the vvt working won't hurt to check it

[Is200Sully]

Yes car went to main dealer today for a full going over and they say it's the catalytic converters need replacing there broke down

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[mDx]

Probably i would say the same when i want to steal a bit of money from you. I woudn't think its cat at all, take it of, take it for a drive see how it goes without it. But maybe its lack of fuel mixture in the cylinders, check compression of cylinders. Hopefully its something easy, cat from dealers might be very expensive, and most of times they are wrong, even they fix the problem they will fix it other way around. I hope you trust the person who u gave the car bud

[Is200Sully]

Changed full exhaust with a second hand one and still have same problem... So next I'm gonna check as you said the compression and the spark plugs and see if this sorts it out

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[mDx]

yes do compression test and let me know what is the compression. ive got 170psi

[Is200Sully]

Did a full service on the car today and while the plugs were out I done a compression test all were similarly just above 170... After service car still drives the same... Lacking power and shuttering from 4000 revs upwards was wondering if the vvt solenoid was faulty or filter was blocked would it cause my problem?

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[Is200Sully]

Also forgot to mention now that I have service the car it threw on engine light after driving it for awhile saying engine running to lean bank 1 and bank 2...

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[mDx]

Not enough air, check your Air filter clean it, check your throttle body. Something is really wrong sometimes. I hope you do d job urself cuz all this cost more to do in somewhere, just get a new engine with low mile lol. What spark plugs u used?

[Is200Sully]

Changed air filter and all that yesterday used genuine spark plugs from main dealer...

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[mDx]

Sorry did u tryed to plug in OBD II and scan over? Any errors ?

[Is200Sully]

Ya scanned it said to lean bank 1 and 2 after the service reset it and no light on since

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[mDx]

Probably u have to change MAP sensor, i would say so.

[Is200Sully]

But if map sensor was gone it should do it hot or cold no? Is there anything else that could be causing it to do this... Lately it's once it gets warm after been drove for awhile it will start to lose the power be sluggish going up in revs nd at 3500rpm start to fight with you and shutter and refuse to rev or sometimes goes up a bit only like as if cars under pressure...

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[mDx]

mhm interesting, did u check the air pressure? try checking fuel pressure aswell. What mileage is on?

[mDx]

u can plug in computer it should read about 4.5 PSI
Try checking if the intake does take air, if the butterfly opens fully on pressed gas, u can only see if the car is running.

[Is200Sully]

How can I check fuel pressure?? And am milage is big enough alrite 166000 miles

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[mDx]

http://lexus.solar3.eu/rm/rm684e/m_fi_0006.pdf

[Is200Sully]

Yesterday I changed the vvt solenoid cleaned the little filter with it and changed map sensor and cleaned throttle body, now car idles high but I'm told that's common after cleaning throttle body and will go away eventually, took car for a drive seemed completely new loads more power but still some slight jerking at 4000rpm :/ so still not 100%

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[mDx]

cud be then transmission maybe?

[justsam]

This sounds like my car it's juddering when I accelerate.. engine light on..someone told me spark plugs or coils..is it just a case of replacing parts And hope for the best?lol damn car (female)(no knowledge) :(

[mDx]

can you plug in the computer and check the codE?

[justsam]

I could at a cost and I'm trying to keep it low as ball joint needed just had welding done.