No Vvt'i Kick

[apsaauga]

Good day, now for a long time i have problem with power loss, some of You may even be pis :tsktsk: d because my questions. But still, i hope there will be some advices. Some people said that i may have problem with pre-cat, because car is slow. There are no lights on the dash blinking, diagnosis shows nothing bad. But the power loss is huge after some driving, and even more after hard driving, trashing. First of all i changed the whole back of exhaust from the main cat to the exhaust tip(i don't know how it is in english), because it was choked. It feels a little better when shifting, the lag is smaller, but still... And now I even not always can feel the VVT'i kick effect, more and more often. So is it something wrong with valve? Or it may be the pre-cat problem for sure?

Sorry for a long storry, but i am letting down my hands and am thinking of selling it, but i don't want to do that !

Thanks ir advance

[Brettster]

How old is the car? how many miles has it done and has it been fully serviced?

it could be a dirty filter, bad fuel, something else.

im no expert, but the more info you can give, the better the advise you will get.

[apsaauga]

The car is 2002 manual, 47 k miles on the clock, a week ago i changed the engine oil, filter, air filter is clean. Few sparks were checked, they said they're fine. I tried to drive a month with Nitro 3000, it is something like Optimax in UK, and there was no big difference. Anything more details needed?

[Brettster]

have you reset the ECU? might clear the fault

[apsaauga]

Yes, yesterday after work, and nothing changed

[Brettster]

Well im sure someone else will come along with some better advise than I can give

[apsaauga]

Anyway, thanks for your time

[ColinBarber]

vvt-i doesn't kick in so it shouldn't a problem with the variable timing.

The kick comes from ECU altering the timing advance and changing air path into the engine. Your problem does sound like a restricted exhaust and it would be worth removing the downpipe to inspect the precats and look at the front of the main cat for any damage.

[apsaauga]

I asked exhaust system specialist to look at the pe-cats, but they said it is hard with lexus, i don't know if it is. they also said if pre-cats are damaged there should be some pre-cat parts in front of main cat and they should make some sound. Is it true? There was no sound.

[TheDon]

when UKAZN had a custom exhaust fitted (2x rear boxes) his car lost the 4k kick.

And as soon as he put the standard exhaust back on it came back! cant explain why but it must have something to do with back pressure surely?

[apsaauga]

Hmz, strange... but as i remember i could feel kick after i changed my exhaust back.. I couldn't feel it before change i know for sure!

Oh, and before changing exhaust back i was driving whole day without it, it was very noisy, but felt better when shifting and lifting off, however not always felt 4000-4500 kick

[Gord]

i had a car once that that the same problems mate it was the cat, it got slower, and slower and slower until no more, as the gases have no where to go when new cat but on still the same, until i had a look in the back box, and there was a big bit of the cat in there stopping the gases getting out took it out and away it went free reving again :D hope this helps you :D

[apsaauga]

Thanks Gord, i hope it is that problem (sick huh? :) ), i want to be sure about that 100% before some actions. thanks

Besides You mean main cat or pre-cat?

[Gord]

the car didnt have pre-cats only main cat (not a lexus) :D was a vw

[Dave-Ellen]

A kazama zorst may help..............

[AltezzaScott]

i had a car once that that the same problems mate it was the cat, it got slower, and slower and slower until no more, as the gases have no where to go  when new cat but on still the same, until i had a look in the back box, and there was a big bit of the cat in there stopping the gases getting out  took it out and away it went free reving again  :D hope this helps you  :D

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Was it the head or body and legs Gord... those bloody ginger toms get everywhere!!

Must have ben a powerflow too for it to get inside!!

:mat: :mat: .... i`ll get me coat!!

[apsaauga]

Noticed strange thing: my exhaust tip is smoked like diesel, i clean it, and after some ride it is black again. The funny thing is, that the back bumper is also smoked because of the exhaust like diesel! What the does that mean? Never happened before.

Also, today i was filling my fuel tank, filled it up and the car even lifted up slower than before i came to fuel station, i am not talking about +60litres, the engine was working different, something like lack of fuel:/ What is it?

[Monster-Mat]

have you checked the cat which has been suggested several times now!

drop the main cat section.........Voila, you will see if either the pre-cats are breaking up, as BITS WILL FALL OUT

[apsaauga]

Don't be mad at me, i asked to do that in exhaust service, but they refused, because they could hear those parts when moving the main cat. I know, sounds stupid, but don't want to do something in that kind of service:/

Thanks for Your time

[Monster-Mat]

Don't be mad at me, i asked to do that in exhaust service, but they refused, because they could hear those parts when moving the main cat. I know, sounds stupid, but don't want to do something in that kind of service:/

Thanks for Your time

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"I ain't mad at ya" ( Tupac Shakur)

if you remove the main cat section you will see if either precats or main cats are damaged, the main cat you will see, and if its pre-cats small pieces of the precats will be sitting in the pipe

YOU WILL NOT HEAR if there are loose parts in there on all occasions

[apsaauga]

this is what i call explanation:) It will be done tomorrow morning, let You know how was it.

And by the way: "I ain't mad at ya" :)

Cheers

[Lexus Jim]

I asked exhaust system specialist to look at the pe-cats, but they said it is hard with lexus, i don't know if it is. they also said if pre-cats are damaged there should be some pre-cat parts in front of main cat and they should make some sound.  Is it true? There was no sound.

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what a load of rubbish. they must be the worst exhaust specalists anywhere. I wouldn't go back there ever.

If it is your pre cats that have crumbled, might as well have them removed rather than buy a new manifold (or buy an uprated manifold with no pre cats :D )

[apsaauga]

Lexus_Jim, that is true, i thought about that too, if it is pre-cat i would be happy to cut them out and enjoy my ride!

[apsaauga]

They are afraid of lexus or what? New specialist :) actually refused to check the pre-cats, because they also said that pre-cat parts should be heared in the main cat section when he hit it, and again, there was no sound! And if i want to check the main cat, they have to cut it and look through it. Do they really have to cut it? I am almost giving up, it seems that people don't need money anymore that i "want" to spend. It is good that garages live ritch these days!?

[PhoneDrome]

if you remove the main cat section you will see if either precats or main cats are damaged, the main cat you will see, and if its pre-cats small pieces of the precats will be sitting in the pipe

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Just do it :winky: