Idle up, idle down, dies

[jjeffries]

Ron...fair question. Maybe I should have said, pick one path and follow it. Tony is good at guiding/insisting on an orderly approach. When someone has yet to master CIS basics, they often seem to struggle and flip around all over the place. No disrespect intended to other CIS gurus out there....I keep learning from all of you. John

[mark944T]

Shouldn't there be a vacuum line attached here on the WUR of my 1980 SC? I'm getting ready to a vacuum leak test and I see in the Pelican How-to section they show a vacuum line on this.

[Rawknees'Turbo]

^^^

On the turbo WURs that is simply a pressure vent so that the diaphragm inside the WUR can move freely. If the diaphragm ever ruptures, fuel flows out of that, and in stock trim, a hose is connected to it, and then to the air filter housing, so that fuel doesn't spill onto the engine.

[mark944T]

What hose should I attach the smoker to test for a vacuum leak?

[boyt911sc]

Originally Posted by mark944T

What hose should I attach the smoker to test for a vacuum leak?

Mark,

First, your WUR-072 is not vacuum assisted. Vacuum is never applied and used for this particular type of WUR. Some of the advises offered to you makes sense others are just garbage. So be careful whose direction to follow.

I have a strange feeling that you don’t know or understand how to use the Smoke tester tool you have. You need to isolate the CIS unit (airbox, throttle body, and intake runners) to perform a pressure test using a smoke generator or machine.

You need about 5 mins. to do your fuel pressure test and 30 sec. for your vacuum or air leak test. Do these two (2) tests first to understand what is going on with your engine. I am betting my money on unmetered air.

So what happened to the missing rubber hose connected to the top of your WUR? You might have also a nipple at the throttle body left unplugged. Could you post a picture of the throttle body and air filter housing? Thanks.

Tony

[mark944T]

Tony,

Are you referring to the nipple I circled in yellow? I don’t recall seeing a hose there and it doesn’t look like one was ever there.

Pelicans tech article on Vacuum Leak Test shows the picture below. A hose going to the WUR. Are you saying I am missing that?

[mark944T]

Originally Posted by boyt911sc

Mark,

First, your WUR-072 is not vacuum assisted. Vacuum is never applied and used for this particular type of WUR. Some of the advises offered to you makes sense others are just garbage. So be careful whose direction to follow.

I have a strange feeling that you don’t know or understand how to use the Smoke tester tool you have. You need to isolate the CIS unit (airbox, throttle body, and intake runners) to perform a pressure test using a smoke generator or machine.

You need about 5 mins. to do your fuel pressure test and 30 sec. for your vacuum or air leak test. Do these two (2) tests first to understand what is going on with your engine. I am betting my money on unmetered air.

So what happened to the missing rubber hose connected to the top of your WUR? You might have also a nipple at the throttle body left unplugged. Could you post a picture of the throttle body and air filter housing? Thanks.

Tony

What do I need to remove to get a picture of the throttle body? Just to reiterate. I know nothing about these cars.

[boyt911sc]

Originally Posted by mark944T

What do I need to remove to get a picture of the throttle body? Just to reiterate. I know nothing about these cars.

Mark,

For this investigation, just remove the air filter cover (snorkel) like shown in the above picture. I like to see the area between the throttle body and air box from the driver side viewpoint. There are two (2) small nipples above the butterfly valve on the throttle body. Thanks.

Tony

[mark944T]

Originally Posted by boyt911sc

Mark,

For this investigation, just remove the air filter cover (snorkel) like shown in the above picture. I like to see the area between the throttle body and air box from the driver side viewpoint. There are two (2) small nipples above the butterfly valve on the throttle body. Thanks.

Tony

I don’t see them. Here’s some pictures hope helps.

[boyt911sc]

Mark,

In the second picture where the black/blue hose is connected, there should be another smaller nipple. Now, to get to the bottom of your problem let’s identify your throttle body.

Look closely in the last picture you posted. To the lower left of the spring is an aluminum strip I refer as label. Please post the last 3 digits stamped on the label and post the number. While you are there, take also a look at your fuel distributor number. Post the last 3 digits. Thanks.

Tony

[mark944T]

Originally Posted by boyt911sc

Mark,

In the second picture where the black/blue hose is connected, there should be another smaller nipple. Now, to get to the bottom of your problem let’s identify your throttle body.

Look closely in the last picture you posted. To the lower left of the spring is an aluminum strip I refer as label. Please post the last 3 digits stamped on the label and post the number. While you are there, take also a look at your fuel distributor number. Post the last 3 digits. Thanks.

Tony

Tony, I don’t see another nipple or a tag or number. Maybe the tag was removed.

Thanks for your help but I’m going to take it in to a shop. I’ve driven the car a total of 140 miles since I bought it last year. Going back to my 1965 Mustang.

Closed thread. I’m out of here.

[boyt911sc]

Originally Posted by mark944T

Tony, I don’t see another nipple or a tag or number. Maybe the tag was removed.

Thanks for your help but I’m going to take it in to a shop. I’ve driven the car a total of 140 miles since I bought it last year. Going back to my 1965 Mustang.

Closed thread. I’m out of here.

Mark,



Encircled is the aluminum tag or label for the throttle body. I think you are making a good decision to take it to a shop.

Tony

[mark944T]

Originally Posted by boyt911sc

Mark,



Encircled is the aluminum tag or label for the throttle body. I think you are making a good decision to take it to a shop.

Tony

Tony, I’m taking it to a shop because I’m not getting answers to my questions.
Mark

[Dave Kost]

Mark,

When you take it to a shop have them set the idle mixture. I have attached a link to CIS Flowtech web site that details the process.

Bosch K-Jet Mixture Setting - CIS Flowtech

[pmax]

Sorry to see Mark go before any technical resolution to his CIS issues.

Just want to add that ...

Originally Posted by jjeffries

...I keep learning from all of you. John

... suggesting someone tune everyone else out is not going to help anyone do that.

The more current and future experts there are in any topic and the more inviting and welcoming we are to their input, the better it is and will be for the forum.

[HarryD]

While I doubt anyone can totally replace Grady Clay, this post really sums up what this BBS is about and how Grady viewed our obligation to the fellow users:

Originally Posted by Grady Clay

Dave,

Let me reinforce the sincere welcome. The stuff you
are learning today, you will pass on to the next new
911 owner with a fresh perspective. We are all here
to help each other.

One of the things you will find unique to this Forum
is the ability and willingness for everyone to state
things correctly. I post something in error at least
once per month. There is this wonderful feature
called an “Edit” button that allows me to post the
error acknowledgement and the correction.

Most of my posts try and answer the question at
hand but also provide the detail for the wider
issues that someone might search on. When you
see someone posting far more detail than necessary,
they aren’t being condescending to the questioner,
just providing archival information.

Additionally our host has a “Search” function.
Understanding how that works and the “key
words” is critical for the efficient use of the Forum’s
extensive archives.

BTW, Please post some images of your “new” 911.

Best,
Grady