2.2 KV Idle problems

Richi95 · 27-05-18, 07:00 PM

Hi there,

Over the last 6 months I've been carrying out some work on my audi coupe so it has been off the road for this period of time.

Now the car is on the road it has developed quite a rough/lumpy idle after not being used for long. Over the last few weeks I've put in a new fuel pump as the old one was knackered, new HT leads, new spark plugs (bosch w6dtc), new bosch distributor cap and rotor arm.

My next steps were to replace the fuel filter. The intake boot that goes over the k-jet to the throttle body has got a slight tear in that, so I was going to replace that also, and clean out the throttle body etc at the same time.

It's okay on initial start up but after a minute or so it bogs down and starts to hunt around 500-750rpm. It doesn't cut out however.

Is there anything anyone else can recommend from experience?

Thanks in advance.

John. · 27-05-18, 07:11 PM

Quote:

Originally Posted by Richi95

The intake boot that goes over the k-jet to the throttle body has got a slight tear in that, so I was going to replace that also.....

Richi95 · 27-05-18, 07:14 PM

Quote:

Originally Posted by John.

I shall change the intake boot in the week as soon as the new one arrives and report back! Fingers crossed that solves it

Duffy3074 · 27-05-18, 08:46 PM

If you’ve got unmetered air going in that tear, that will definitely be a problem

Mellis46 · 28-05-18, 08:45 AM

+1

In fact check any and all of the rubber hoses in and around the inlet. there are a few sneaky ones and any one of them which is melted or perished will contribute to a lumpy idle

andya · 28-05-18, 09:15 AM

Same as above, sounds like an air leak. Check all the hoses, the vacuum pipes, all of them! Hopefully it's the one you've already highlighted. If none of those help, try swapping over the isv relay (behind the passenger side glovebox).

Richi95 · 16-06-18, 06:08 PM

Quote:

Originally Posted by Duffy3074

If you’ve got unmetered air going in that tear, that will definitely be a problem

Just managed to get some time to work on the audi today, fitted the new intake hose and cleaned everything out and she runs great. Was definitely a vacuum leak!

Cheers fellas

28-05-18, 08:45 AM	#5
Mellis46 Aero Advocate Classic Audi Club Member Join Date: Aug 2014 Location: Lancashire Posts: 1,448	+1 In fact check any and all of the rubber hoses in and around the inlet. there are a few sneaky ones and any one of them which is melted or perished will contribute to a lumpy idle __________________ -1987 90 2.2E / Sapphire Blue (Rest in Pieces) -1989 90 quattro with Sport Equipment / Satin Black -1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)

28-05-18, 09:15 AM	#6
andya Senior Member Classic Audi Club Member Join Date: Aug 2010 Location: Hampshire Posts: 1,149	Same as above, sounds like an air leak. Check all the hoses, the vacuum pipes, all of them! Hopefully it's the one you've already highlighted. If none of those help, try swapping over the isv relay (behind the passenger side glovebox). __________________ 1985 Coupe Quattro 1986 Coupe 1.8 weber carb 1987 Coupe 2.2 GT

27-05-18, 08:46 PM	#4
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	If you’ve got unmetered air going in that tear, that will definitely be a problem