Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[moorej91]

I am trying to find help on removing and cleaning icv on 1999 2.0 ecotec omega. Thought I had seen on forum before but cant find it now. Vauxhall new part is £108, have seen some on ebay, anyone know if these are any good? Also if cleaned properly wil the old one perform as a new one.

Any help apreciated.

[Phil B]

Haynes manual can point you in the right direction (don't take it too seriously though  ) if you can't find a thread on here.

I recently did mine as the idle was erratic, make sure you give it a damn good flushing with carb cleaner, from both ends.

That stuff evapourates quick so put your finger over the inlet, dump a load in the outlet then cover the outlet with your thumb and give it a good shake.

Repeat a few times, then give it a squirt of WD or similar.

Make sure the seal is in good condition and fully pressed back into the plenum when you put it back!

[ians]

Also clean out the breather hoses, throttle body and in particular the metal nozzle that the small breather hose connects to under the TB.    Most likely you'll be able to reuse the ICV but change the gaskets (ICV and TB) - about a quid total from Vx.

From memory I never found this in Haynes..

Member here Grumpy has written about this very comprehensively in the past so do a search on his posts

[Abiton]

Grumpy is indeed the man on this topic.  I recently cleared out that small jet properly, by removal, following his instructions.  After cleaning it out I carefully measured the jet diameter as between 1.6 and 1.7mm, so if you can find something akin to a wire coat hanger, but 1.6mm max. dia. (most coat hangers are more than this dia.) you could clear it in-situ.  This made much more difference to my low idle speed and cutting-out than changing the IACV (cheapish E-bay one, working fine 5 months on). Now back up to a healthy 850rpm.

[Grumpy]

Hi moorej91.
Have a read through the following threads. (Just click on each link).

What is your defect exactly?
Idle Control Valve problems are normally a symptom, not a cause, so
cleaning/changing it without fixing the root cause of the problem will
just cost you time/money without achieving very much.

Post up what's happening to your car so that we can offer some advice.

http://www.omegaowners.com/forum/YaBB.pl?num=1189337829/0

http://www.omegaowners.com/forum/YaBB.pl?num=1191491479

http://www.omegaowners.com/forum/YaBB.pl?num=1190648791

[moorej91]

Thanks for all your help. The engine cuts out when slowing down or idling. It always starts straight away and the car runs fine. I have an auto so are having to left foot brake while keeping the revs just above 1000 and its no problem. Does this sound like the icv? Al I have read leads to ths.

Thanks again

[Grumpy]

It sounds very familiar to all 2.0L auto owners on this forum.  

Read the links I gave you, do the suction check on the small breather
pipe as quoted in one of the links, and then you'll probably end up
doing this:

http://www.omegaowners.com/forum/YaBB.pl?num=1189513370

Also do a paperclip test iaw this link,

http://www.omegaowners.com/forum/YaBB.pl?num=1189022687

to see if you have a crank sensor code.

Do your test with ignition on but engine NOT running.
Your codes will be 4 digit numbers, not 2 digit.

[moorej91]

Thanks to all especially Grumpy. Have today replaced small breather hose, removed jet which was solid and cleaned until spotlessly clean. It now runs better but whilst in gear (automatic) and at rest idle is about 500 rpm, it still occasionaly cuts out. I have read a thread that says it will take a couple of days to settle down, Is this normal or is it now the the time to replace the icv. Has anyone bought one of ebay? are they good?

Thanks

[Grumpy]

Did you replace the gasket between the IACV and the Throttle Body?
Did you fit the gasket the correct way round? The mating face is not
symmetrical, and will not seal correctly if incorrectly fitted.

Check the large black intake trunking between the Throttle Body
and the Mass Airflow Sensor is correctly aligned at each joint and
that the jubilee clips are tight.

Check the Vac Tube on the front of the Throttle body is secure and
in good condition. It provides a variable base reference pressure
to your Fuel Pressure Regulator. If this is wrong, the ECU will not
provide the correct quantity of fuel required.

Did you have any stored codes when doing the paperclip test?

[moorej91]

Hi,  did not actually take the icv off. I only replaced the top small pipe that had collapsed, and removed the jet which was totaly blocked and cleaned out and checked the jet size of 1.6mm.
As I had no suction at end of pipe before I started I have been working my way back. Do I need to remove icv and clean? Do I have to split the icv valve to clean it? What is inside?
Did not get time to do paperclip test, will do as soon as possible. Have recently had cam belt and pulley changed together with cam sensor.
The car is running much better and idles most of the time, just the occasional engine cut out normaly when the car is slowing after lifting off the throttle quickely.

Does this point to anything?

Thanks again for your help.

[Grumpy]

Do I need to remove icv and clean? Do I have to split the icv valve to clean it? What is inside?

All explained in the guide I wrote.

http://www.omegaowners.com/forum/YaBB.pl?num=1194007453

[moorej91]

Thanks again Grumpy. All is now much clearer thanks to your great explanation and graphics and I understand the necessity of doing the clean of the icv.

Many, many thanks.

[shyboy]

Like most 2.0l owners on here I had this idle problem a while ago. Went through all Grumpy's procedures, but still had occasional problems, but since I did 2 oil and filter changes, (and flushes), within about 2500 miles I've had no recurrence and the car runs beautifully.
They do, perhaps, need a period of further running before the effects of the cleaning kick in totally.
I did renew the ICV but lots of guys on here seem to clean them successfully.