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young olds
26-04-18, 23:35
When I bought my car the previous owner had the icv disconnected and the idle screw adjusted to compensate, but you had to hold your foot on the gas while it was cold to keep it running. I plugged the icv back in adjusted the tps and it would idle by itself cold. but many times upon start up it would idle at about 2k, whether it was cold or warm, as well as whenever it did idle at a proper rpm(which would happen randomly) it had an idle surge(rpm up and down a few hundred rpm).I have since replaced the tps, icv and the coolant temp sender in an effort to fix this and it has gotten better but Iím still getting the idle surge and when Iím driving if I let off the gas while the clutch is in it usually dies, sometimes the idle will drop really low and recover, I can keep this from happening if I throw it in neutral so I can brake with one foot and ease the idle down but itís annoying to have to do.

Steve Webb
27-04-18, 13:30
Hunting at idle is usually down to a vacuum leak somewhere, the old vacuum/boost hoses have a tendancy to split and cause random issues. Get your self some small bore silicon hose, stays in place better, looks better, and might solve your problem.

Do you have any idea why the ICV was removed? Is the car running a standard chip? It is running a bleed valve?

young olds
27-04-18, 18:09
Idk why it was disconnected, and it did not have a standard chip when I got it. Whatís a bleed valve?

Steve Webb
27-04-18, 19:13
Bleed valves are a crude method used to fool the turbo into producing more boost, they are usually indicative of a car that has been messed about with and modified badly.

Not sure why the previous owner would disconnect the ICV, was it a Japanese car?

young olds
28-04-18, 03:00
Ok, probably what we call a mechanical boost controller here. It does not but it does have an electronic boost controller. Yes it came from Japan. And I spoke to soon, car idled at 2k after a warm start lastnight, was doing well on that front recently.

Steve Webb
29-04-18, 21:33
Have you taken a look at the website yet? We've got a lot of the workshop manuals for the Q4, the way the ICV on the 16v Integrale is setup should be similar. I'd be looking to put the car pretty much back to standard again before moving it forward. There seem to be a lot of unknowns with the engine, you could end up chasing your tail with lots of annoying little probkems.

young olds
29-04-18, 22:20
I do need to take some time to go through it and make sure everything is hooked up right. Iíve been wanting to clean it up under the hood anyways just been putting it off cause itís so tight in there.

AlfaJack
29-04-18, 22:48
Mine is a bit odd on startup - it kind of needs to clear its throat before it allows me to move - its a bit annoying as the garage is at the bottom of my driveway which is a pretty steep hill. I'll be pulling the ICV apart soon.

If the ICV was disconnected and you have now replaced it and it's still not right, could it be the wiring is not good?

young olds
02-05-18, 23:04
Are there very many vacuum hoses to sort through? I’ve seen a few but idk if they t off or if there are any under the intake plenum. How involved is it taking the intake manifold off? Can I just buy a new intake gasket or will I end up removing other things getting it off?

young olds
02-05-18, 23:07
Mine is a bit odd on startup - it kind of needs to clear its throat before it allows me to move - its a bit annoying as the garage is at the bottom of my driveway which is a pretty steep hill. I'll be pulling the ICV apart soon.

If the ICV was disconnected and you have now replaced it and it's still not right, could it be the wiring is not good?

I guess it is possible the wiring could be faulty.

Steve Webb
04-05-18, 11:32
Are there very many vacuum hoses to sort through? I’ve seen a few but idk if they t off or if there are any under the intake plenum. How involved is it taking the intake manifold off? Can I just buy a new intake gasket or will I end up removing other things getting it off?

An Integrale inlet plenum is far easier to get off than the Q4 one, but I dare say there will be other bits and pieces that need to come off, or be moved to physically get it out.
There are quite a number of small bore hoses around the engine bay, Map sensor, overboost valve etc etc, any one of these can cause issues with starting and running.

young olds
08-05-18, 07:06
Next time I have some time to sort through things Iíll get in there and see what I can find.

young olds
11-05-18, 22:36
I got the car out today and I could not get the idle to come down below 2k even after it was warmed up. I unplugged the icv and adjusted the air bleed( not sure what itís called) until it would idle at just below 1k and drive it to work. It ran flawlessly, no weird rpm drop and dying when letting of the gas, no high idle and no idle surge. That leads me to believe that the icv is working incorrectly. Iíve heard of people ďtuningĒ out the icv is that possible on the stock ecu with an eprom emulator?

Steve Webb
12-05-18, 14:09
It does sound as though either the ICV is not functioning correctly or whatever chip you have has altered it behaviour.

First off i'd get the ICV off and give it a good clean and check the electrical connections, check there aren't any splits in any of the pipe work and give it another try.

Beyond that I'd be looking at the ECU.

young olds
12-05-18, 18:23
Icv is new, replaced it when I was first trying to fix the problem. Iím running an ostrich eprom emulator(with what I believe is a stock map) instead of the chip that came in the car. Is there a hose set I can buy to replace all the rubber hoses? I want to replace them cause most are old and the ones that arenít are miss matched in color(some blue and some red).

Jan300
13-05-18, 16:50
Is your tps set up correct?

young olds
13-05-18, 21:35
Iíve adjusted it but idk if itís ďcorrectĒ

young olds
16-05-18, 03:40
Whatís the proper way to adjust it? Iíve not found a good write up

Jan300
17-05-18, 14:21
Im not sure about your car but most of Weber Marelli cars its around 0.2volt at idle.If voltage is to high the symtoms can be like your car

young olds
18-05-18, 00:41
I have it set at .3 currently, will try a lower setting and report back

young olds
24-05-18, 19:41
Anyone know where I can get a float for the fuel level sender?

young olds
18-06-18, 17:44
Tried a lower setting on the tps, it helped but was still a slight issue while driving cold. Now a canít get tps to go lower then .4 and itís running poorly again