Unstable Rev's On Idle

[xEla]

I have stunning Celica VVTi 2000

the engine was reconditioned due to well known problem - oil burning

since then - have no problem with oil.

however, I've got this problem, which was here before reconditioning, but I was hoping it's going to go away once engine is done.

basically - only when the engine warmed up (not when it's cold and has higher rev’s and additional fuel intake) on idle (neutral or clutch down) rev's keep jumping slightly up and down, causing the car shake. I can hear engine is not working evenly (from under the bonnet and exhaust pipe at the back), but if I press accelerator slightly - engine will even itself and works perfectly!

it's a not a big deal and probably most people won't even notice, but I personally don't think it's a very good for the engine to shake like this on idle..

there was an engine error code light came up on the dashboard - which was related to the dead temperature sensor, which was replaced, but didn't solve the original problem.

However, engine was put on the computer and cylinders were checked for pressure - and, according to the garage, it's all fine!

under the bonnet on idle I can hear there is something sucking the air, but can't figure out what it is and whether it's a problem at all...

I was told that there might be a timing problem (don't know what exactly it's called - but it something to do with opening time for fuel to go into the engine)

I have also noticed that right part of the engine is shaking more than the left part.

and finally:

right below the throttle there is a plug with wires connected to the engine (I think - it's a fuel injection sensor or something) - when I unplug it - engine immediately starts working evenly and nicely, but on higher rev's (about 1k) and I cannot start cold car without this plug....

guys - tell me there is a little thing that need replacing and it will solve the problem? :(

[nkundalia]

Hi,

I've noticed the same problem, but it doesn't happen very often have not really given it another thought,

But would be interested to know it happens and whether or not it is normal

Thanks

Neil

[celica140sport]

Hi,

I've noticed the same problem, but it doesn't happen very often have not really given it another thought,

But would be interested to know it happens and whether or not it is normal

Thanks

Neil

ditto on this. i also had the same problem on my car before 1998 vauxhall vectra it turned out to be the idle control valve.

but on my celica it happens about once a month so ive not paid it much attention. but its done it today so this thread seemed appropriate

[blackcts]

Yea, my 190 has done this for over the year that i've had it. Didnt really worry about it TBH, if it starts cutting out then ill start to worry. Spoke to a guy with an 03 new model Avensis and his car does exactly the same thing.

Thbis months Car Mechanics magazine done an article on VVTis and this is listed as one of the common faults. They said how to remedy it but i cant remember off hand. Was going to buy it only for the queue! I will pick it up and post if i see it again.

[xEla]

omg!

it looks like a common problem.. i thought i was the only "lucky" one to have it ;)

blackcts

i'll try to search online...

[xEla]

couldn't find anything on the inet... nor i've noticed this article mensioned on their web-site..

celica140sport

do you know how do you check and fix idle control velve?

[celica140sport]

sorry ela not sure on the celica. on my vectra i had to take off the intake pipe and the thorotle body to pieces. it was all siezed up. i wouldnt know on the vvti everythings all crammed together so tightly. is your celica cutting out cause that what the vectra used to do (nearly crashed it once it cut out going round a bend at 60 electrics went so did power steering ended up on other side of the road lucky nothing was coming). i have a pic of where it was on my vectra if youd like me to post it up?

[xEla]

celica140sport

no my car is not cutting out, keeps running anyway, but you can see it's struggling...

if you could post some pics - wouldn't hurt.. =) i might check it out this weekend.

thank you.

[celica140sport]

ok heres the pic prob meens nothing to anyone but me lol the red circle is where the idle valve fitted to (sorry dont have a pic of the actual vavle. the big circle next to it was where the intake pipe fitted on. hope that helps you like i say this is a old vectra lol

[xEla]

celica140sport

thank you! i should show this to one of my "knowing" friends =))

[celica140sport]

i found this on one of the other sites its similar to what i was saying this should tell u what u need to know.

http://www.newcelica.org/forums/showthread.php?t=285073

[xEla]

celica140sport

thanks a lot, but i cannot open the link... would you mind copying and posting relevant info here?

[hawkerpaul]

This could well be an air-related issue.

When was the last time you checked/changed your air filter?

also check the large rubber hose coming out of the air box to ensure it is connected properly and the clip is screwed down tightly.

may also be worth checking the small rubber pipes near to the butterfly valve to make sure they are connected nice and tightly.

Also may be worth replacing the MAF sensor, or at least clean it with some carb cleaner. its is a very sensitive piece of equipment however, and replacing might be safer.

[xEla]

hawkerpaul

thanks

air filter was chaged 2 month ago.

throtle is connected and secured properly.. i was thinking giving butterfly a clean... may be do that then..

MAF sencor - what is it? i've cleaned one that is located next to the other end of the throtle pipe...