high idle - ive been searching - I FIXED IT YEY!!

[officejunkie 0]

Hi there.

 

Ive been reading so many threads now i have come to the point where im forced to ask for help!

 

brief spec.

 

i have a corrado G60 with a G-werks rebuild charger + 68 pully + the shorter belt and the chip that goes with it other than those things its stock. It doesnt hunt and runs very well. when i blip the throttle the engine goes right back to 1500 without trying to die.

 

When i disconnect the blue plug sensor it idles at 850rpm where it should. I have replaced the blue temp sensor but it still no worky right?! Ive screwed the idle screw in as much as it will go and it drops the idle speed real nice and low, but when i plug it in it goes right back up to 1250 which is a little better than before.

I am not sure if its the ISV as from what i read if it idles right and true then it should be ok?

can you guys please help me out and point me towards a solution?

 

Regards

 

Nas

[dirtytorque 0]

The thing that increases idle speed is air.

When the car is warm if you unplug does it still idle high?

Try looking for splits in any of the vac oses or the hose that goes from isv to throttle body or any hose that will let air into the engine via a route other than the throttle or the isv.

[officejunkie 0]

hi and thanks for the reply!!

 

yes the idle drops when i unplug the isv or the blue plug or click the microswitch on the top of the throttle body,

 

Ive cleaned the ISV out and it wasnt even that dirty tbh.

 

I checked for leaks and all the hoses look like they are on properly. i think i might end up taking it to someone or perhaps even changing all the hoses for new ones.

 

whats the crack with the standed hose clips? pile of crap!!!

[Rob_G60 0]

mine is the same mate, also when i start it goes up to 2000rpm then drops too 1250rpm, im gonna keep an eye on this thread lol

[officejunkie 0]

well from what i read about these cars that theres a lot of general running problems - especially when it comes to idle. I think that theres four main components which cause the problems here.

 

ISV

Sensors + grounds

Timing

Air Leaks

 

after much searching - I found this link

 

http://www.corrado-club.com/faq/detail_faq.CFM?FAQID=16

 

In a nutshell it basically says to check the grounds especially the one your ECU uses via the bracket and the nut you use to secure it to the chassis..My car never came with no nut securing this ECU to the chassis! I discovered this initally when i refitted my refurbed 'charger changed the pully and changed the chip. I wasnt aware the ECU needed grounding in this way so i thought nothing of it!

 

So heres what im going to do - im going to buy a nut and some sand paper - sand the bracket the ecu sits on till its really clean, not forgetting the points where it bolts to the chassis and then use the nut to clamp it down properly!!

 

I will then adapt a "grounding" kit / make one out of four guage and then fit.

 

Im going to replace every last hose in this car!! I dont want anymore of these annoying problems ever again.

 

If non of this works im checking every sensor with a multimeter and then im going to take it to a specialist to get the timing done.

 

Ill update the thread with what fixed it or if i decide that the car must burn to its death!

[officejunkie 0]

OK today - i went to get my mk3 golf sunroof and found an earth wire on this golf gti that had some round terminals on each end and wasnt too long. SO i attached one end to the post the ECU uses to bolt down to, and one end on the bolt that goes through the firewall which clamps the coil on. This DIDNT work!

 

Still idling at 1250 rpm.

 

Then i fiddled with some hoses. Nope.

 

Looking closely at the throttle body i noticed that at the back of the part which the accerator cable pivots on theres a little tab and next to it theres a microswitch. The tab wasnt touching the microswitch. I then bent the braket holding this tiny little switch towards the firewall.

 

The idle is not 850 RPM dead. NO hunting no messing - 850 rpm exactly!!! :D :D :D :clap: :clap: :clap:

 

This problem was REALLY doing my nut in :brickwall: . Makes you feel proud when you fix something if your a bit of n00b!! :wink:

[boost monkey 0]

Glad you got it fixed, but there is actually a little screw that adjusts the brackets distance from the microswitch when the throttle is closed - no bending necessary! :shrug:

[officejunkie 0]

Yes i did notice that screw, thing is that wasnt touching the tab it pushes against. I think the throttle body may not be closing all the way? Perhaps its worth taking the boost pipe off where it meets the throttle body and giving the butterfly a spray with carb cleaner?

[boost monkey 0]

Possibly yeah mate, i'd recommend adjusting the screw when you can though, I don't think bending the bracket is the workshop way of getting the idle microswitch to work.