Citi 1.8 Carb idle issues

King8v
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Citi 1.8 Carb idle issues

Post by King8v »

Ok so i hope that I'l get siome responses to this post.....

I had my module(If thats what its called) replsced two weeks ago by my auto elec, as it was nt the right one for my car? He also sorted wiring into and around the module as it was a sight! So on the same night i got it back i drove to wocester from CT and on the way there it gave some jerking while cruising at around 120km/h.

When i arrived in worcester and i eventually got to stop, the car was hunting for idle? It never died but continued hunting. The following morning it was gone.

Now 2 weeks later i took it back to him yesterday n he 'fixed' it. When swinging it sprung to life n idled like a crack whore on a dream come true high!!

In my opinion he only adjusted my idle higher? I did however notice that he soldered the wire running from the back of the carb( idle switch off control?) together.

I know how to adjust the idle so i attempted to lower it myself, it does come down,but then starts to hunt again? i have noticed in the past 2 wks tho that this occurs when the car is hot?

Also note worthy is that my vacuum advance is faulty apparantly?

Please im lost here? :lol: :lol: :crazy:
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UDC
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Re: Citi 1.8 Carb idle issues

Post by UDC »

where in cpt you based
could be a cracked base plate or sucking air somewhere
is the vacuum advance from the dissy connected to back of carb?
on front of carb there a short vacumm hose thats goes to a roundish plate with a arm at the back of it, pull this vacuum pipe off, pull on this pipe with your lips to create the vacuum and see if that arm in the back activates, start car rev abit and try again and see if it open the 2nds stage when you pull on that pipe, if it works then your 2nd stage is working, if not working then either the pipe is blocked or the diaphram is leaking or arm broken.
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Re: Citi 1.8 Carb idle issues

Post by Stripes »

UDC wrote:where in cpt you based
could be a cracked base plate or sucking air somewhere
is the vacuum advance from the dissy connected to back of carb?
on front of carb there a short vacumm hose thats goes to a roundish plate with a arm at the back of it, pull this vacuum pipe off, pull on this pipe with your lips to create the vacuum and see if that arm in the back activates, start car rev abit and try again and see if it open the 2nds stage when you pull on that pipe, if it works then your 2nd stage is working, if not working then either the pipe is blocked or the diaphram is leaking or arm broken.
:iagree:

Also check the pipe to your brake booster. My Fox also hunted and surged from idle and I found that the rubber piece on the manifold next to the valve had a tear at the back. Fixed it and presto, clean idle, better response and even better brakes.
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King8v
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Firstly thanx for the responses guys
@Udc im in woodstock. I had my base plate replaced about 5 months ago so this should be good,but will check again. My vacuum advance is apparantly busted so the pipe running to back of carb has been blocked off,i will reattach it to test. it did start n idle with it attached.

@Stripes, ok will check out brake booster also.

Ok i will check these things later n revert back.
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King8v
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Ok So i checked out pipes behind carb n ones running from there,doesnt seem like a leak and also i checked the base plate,by pushing it to sides,like i saw the mechie do when i had it replaced,n no leaks. I find that when i put the vacuum pipe on the vacuum adv it idles rough. how much does it cost to replace a vacuum adv?
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Re: Citi 1.8 Carb idle issues

Post by MK2 G60 »

What unit did he fit as vw brought out a updated black tci unit that had idle control built in to it.To adjust the timing correct you had to earth pin 7 for a few seconds. Easy to check use a timing light and see if the timing jumps round.
Vw did it on the grey tci units too.
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Re: Citi 1.8 Carb idle issues

Post by King8v »

The one he put in there now is black. how does one identify this unit you make mention of? I think there is a number on there also, have to check later.
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Ok so on the 2nd stage side, i find that my carb is a bit lazy to open up the 2nd stage!? And also when it does open n i pull her and release loud pedal to shift, it overrevs, and im not shifting poorly, it alwasy does that? Iv been told that the clip at the back which closes the 2nd stage is busted, iv seen on another golf though that its a spring at the back?
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Ok so yesterday my idle hunting returned briefly!! :bang: As i have mentioned in two threads, i have picked up that this hunting happens when two things occur...now it may sound crazy but :fear: ...1 When i put in more petrol than normal ie half tank+ its as if though the car gets a fright and misbehaves :crazy: :crazy: 2 When car is hot it also does this!! when i let car cool down the hunting stops.
:???:
Just so you know i checked all vacuum pipes again n no leaks, checked base plate n no leak, checked brake booster pipes now leak. :geek: where does one find these vacuum pipes to replace mine? Also how much does a vacuum advance on a dizzy cost?
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Re: Citi 1.8 Carb idle issues

Post by King8v »

g60 golf wrote:What unit did he fit as vw brought out a updated black tci unit that had idle control built in to it.To adjust the timing correct you had to earth pin 7 for a few seconds. Easy to check use a timing light and see if the timing jumps round.
Vw did it on the grey tci units too.
How does one identify which unit has been fitted? Also i dont have a timing light, but if i were to get my hands on one, how does one use it and where to connect etc, i more than eager to learn how to check things myself so i can know when someone bullshits me, so please help. :grin:
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Also how does one earth a pin as described above? i know where the pins are etc just dont know how to earth, and just one.
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Re: Citi 1.8 Carb idle issues

Post by SpyII »

Have you considered replacing the carb, if it is original then you will have vacuum issues, and not necessarily from pipes but from worn structures too. this is what'd happened to my 1.8 carb caddy, and the problem disappeared when I replaced the carb with a new rep one from Goldwagen for 700 bucs (cheap fix) and sorted in 15 minutes.
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Yeah i thought that would be best, but gotta get the cash first. anyway i guess thats gona be the best fix. thanx spy
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Re: Citi 1.8 Carb idle issues

Post by JVA »

try this: get a piece of wire, connect one end to your batteries positive pole and the other end to the wire at the back of your carb, drive around the block and see if it's still hunting. Also check if your carb is earthed properly and have you tried the carb cleaner trick to check if base plate is sucking in air?
My car had the same problem after replacing the carb, ran a new wire to the ignition and the problem was sorted. Could be something completely different causing the problem on your car but it's worth a try.
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Re: Citi 1.8 Carb idle issues

Post by King8v »

I will try this JohanGP, problem is, it only hunts every now and then. iv been back to the auto to try and diagnose a possible electrical fault, found that the ignition module was loose so that was mounted properly. this was a week ago n all was well until yesterday, it started hunting again. upon inspection i kept hearing what sounded like plactis or sumn drippin onto a very hot surface ie exhaust mani, but i couldnt locate the drip spot nor the place where it was dripping from?! but it was at the back of the carb im sure. so possibly a wires insulation is kaput and when it gets hot like that it starts to melt again and this then causes the hunt??!
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Ok so my problem came back yesterday, once again engine was hot as hell?! hunted a bit. so on the weekend will chekc things out again.

Also check if your carb is earthed properly....How do i do this? anyone.
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Re: Citi 1.8 Carb idle issues

Post by GerhardE »

If I remember correctly there should be a brown wire running from the front of the carb to one of the valve cover studs.

Or grab a multimeter and measure continuity or resistance between the metal of the carb and chassis/engine. The reading should be below 1 ohm me thinks.
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Re: Citi 1.8 Carb idle issues

Post by Tdi jetta 4 ever »

King8v wrote:Ok so my problem came back yesterday, once again engine was hot as hell?! hunted a bit. so on the weekend will chekc things out again.

Also check if your carb is earthed properly....How do i do this? anyone.
Any engine that is too hot wont idle normal.
What did the heat gauge show?
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King8v
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Re: Citi 1.8 Carb idle issues

Post by King8v »

Tdi jetta 4 ever wrote:
King8v wrote:Ok so my problem came back yesterday, once again engine was hot as hell?! hunted a bit. so on the weekend will chekc things out again.

Also check if your carb is earthed properly....How do i do this? anyone.
Any engine that is too hot wont idle normal.
What did the heat gauge show?
about halfway, which in my car, is moer hot!! Cos it never gets that hot really, like last night for instance,on the highway my temp guage was between the first and second line all the the 35km i did!?
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Re: Citi 1.8 Carb idle issues

Post by Tdi jetta 4 ever »

Thats normal. If the needle is on the red led light in the middle. VW run hotter than most other cars.
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King8v
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Re: Citi 1.8 Carb idle issues

Post by King8v »

MIne only only goes there 1nc in a skrikel jaar! and thats where the hunting issues begin?!
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Re: Citi 1.8 Carb idle issues

Post by U3 »

you have really been dealing with this issue a while.. maybe just go to a different mechie and have them diagnose the issue..

does the hunting always start then the temp goes up to that point? try and get ur heat up to that point then...
to me that sounds like normal temp but maybe ur sensor is off...and thats why is shows lower normally and then then when ur car is actually over heating it shows normal temp...

goodluck. i hate issues like this where its difficult to pinpoint because the issue is intermittent.
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King8v
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Re: Citi 1.8 Carb idle issues

Post by King8v »

exactly :bang: :bang: :bang:
i think you may be right about the temp snsore not working properly. gotta get this sorted. :mad: :mad: :mad:
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Re: Citi 1.8 Carb idle issues

Post by King8v »

So its been a while, and with the return of warmer weather, it seems my problem has resurfaced. On tues my car started doing its hunt for idle again, it also boggs and died a few times, like it did before. So i redid all my checks, ie vacuum pipes, brake booster pipe
etc!! Still no luck to find squat! since JUly i did a flush and refilled with anti freeze and all was good, just got to like 28 deg outside and bam, back to square one!!! faaaaaaaaaaaaaaaaaaaark!!
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Re: Citi 1.8 Carb idle issues

Post by King8v »

So i have had this issue resurface again on the weekend. Now iv ruled out an air leak, i have ruled out my carb base plate being cracked, iv ruled out the idle cut off valve. What else can cause my car to become erratic when engine is hot, also when its hot outside in general.The fan still comes on as it should, temp guage doesnt go higher than half way, but when it reaches half way, then its starts going wayward.

Things like plugs, plug wires, dizzy, temp senders etc are what i am now looking at?

Any ideas?
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