Hi folks,
as some of you know I got a 00 SType 3.0 not too long ago. Well after a long road trip and 3000 km's on it, I am really enjoying it(the very few times my fiancee lets me drive it).

However, she mentioned to me that she is experiencing a rough idle when the car is cold.

Basically, when first start driving the car, when you come to a stop, the idle hunts and you feel a rough running through the cabin. About 5-10 minutes of normal driving the car goes back to 100%.

There is no performance drop whatsoever and the car runs like a bat out of hell.

Any thoughts?

Car has brand new coils and spark plugs. Could an O2 senor cause that?

 

It's possible that it's an O2 sensor but have a look at the threads about the PCV hose elbow - I think one's in the FAQs.

What you describe is usually an air leak which is why it's most apparent at idle.

You'd need an OBD tool to monitor fuel trims to confirm either an air leak or an O2 sensor. Such as an elm327 (USB is cheap, from ebay).

 

Agree w/ jagv8 - likely IMT o rings.

 

+1 IMT O Rings AND the elbow that is located under the lower manifold!

 

Both! LOL

Good writeups on them and look OK to DIY

See the FAQs but bear in mind forum Search won't find a word as short as IMT

 

Sorry,

what is IMT? (Intake manifold T?)

Secondly, can I just keep running it like this, or will it eventually get to the point where the car will be undriveable.

I used to be a big DIY, but in recent years I've lost the drive, energy, and time to do anything.

 

IMT = Intake Manifold Tuner Valve


It is a must to replace the original yellow-colored factory IMT O-rings (there are two, one for each valve) with the newer, thicker, rounder, and far better-sealing green-colored IMT O-rings. Dealer-only item, but should be less than $3 apiece. Sooner or later, the factory O-rings leak and cause various problems including misfires. Do yourself a favor and replace those O-rings as soon as you can. Search here for Rick's post entitled something like "IMT O-Ring replacement - Short Route". Using the short route, you can replace the O-rings without having to remove the intake manifold. Definitely the way to go....

 

Sometimes known as VIS (see below, I hope I put it in there!)

 

bmw, your IMTs are on the intake manifold but not in the same place as this link: https://www.jaguarforums.com/forum/s...ics-faq-32135/

 

Don't run your petrol car with an ignition or mixture control problem for long -- the catalyzers don't like it. When they tell you how much they cost to replace, you'll know all about that sinking feeling in the pit of your stomach.
Leedsman.
Quote "Secondly, can I just keep running it like this, or will it eventually get to the point where the car will be undriveable".

 

O Boy, does anyone have part number for these rings? I am going to talk to my mechanic, I want to get this done next oil change.

Are the IMT rings underneath the Manifold?
That seems to be the one relevant thread that comes up when I search..

 

Click on the link in post #9


No they are on the intake manifold, again see post #9

 

part #

 

Rick those are some funny looking rubbers you posted. I don't know if they would work real good, looks like they might have a hole in em'.....

 

Awesome, thank you very much!!! I will order them ASAP.

I want the thing running properly.

You guys are super helpful, thank you. I am going to look at the engine and see if I can spot them and see if I can maybe attempt it myself.

 

Chris, they're for guys like me who have already had their vasectomies....

 

 

Maybe thats why Joyce and I had our little surprise a year ago, I was drunk and grabbed the wrong packet! :0

 

Hey guys, I am about to order the "rubbers" and I got thinking if there is anything else that my mechanic should replace (vacuum line?) while he is working on the intake manifold?

Part numbers? Don't want to have him put everything together only to have the car still do the same thing.


EDIT! I found the part code for the little L shaped vacuum hose. !!

EDIT 2! If I just had the intake manifold gaskets replaced when the plugs/coils were done, do I need to replace them again or can I reuse the ones that were just put on 2000km;s ago?

 

Anyone can help with EDIT 2? I want to go ahead and order the parts this weekend.
I've already ordered the L Vacuum line from the ford dealer!