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Pumpkin Sage Ravioli and ICV Hoses

 
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Philly924S  



Joined: 20 Nov 2016
Posts: 12
Location: Philly Burbs

PostPosted: Wed Nov 23, 2016 11:12 am    Post subject: Pumpkin Sage Ravioli and ICV Hoses Reply with quote

Happy and Healthy Holidays One and All

Some of you may know from my previous post that I am replacing the vacuum lines and other hoses under the Intake Manifold. This is a specific question so I thought I should start a new thread. On my car, both outlets on the Idle Control Valve are 19 MM. These hoses connect with the J Boot and the bottom of the Intake Manifold (the “S” hose). Unfortunately, on my car the J Boot and IM connections are 13MM. Are these special order items?

I tried taking a piece of 13 MM silicone hose and heating it, hoping it would stretch to fit the 19MM opening on the ICV. The silicone hose split. Would rubber 13 MM hose stretch to fit if I heated it, better than silicone?

Thanks for your help.

Oh the Pumpkin Sage Ravioli...that is my contribution to Thanksgiving Dinner this year. Along with wrenching on my car, I am comfortable on an induction cooktop and a convection oven.

Alan
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Grenadiers  



Joined: 20 Feb 2007
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Location: Nelson, WI & Prescott, AZ

PostPosted: Wed Nov 23, 2016 11:49 am    Post subject: Reply with quote

Alan, I haven't been able to source silicone hoses for your application. However, Autohausaz might have the originals.

http://www.autohausaz.com/search/product.aspx?sid=zchgf0fc11dqp4izn1zgbw3c&makeid=800019@Porsche&modelid=1263327@924%20S%20&year=1988&cid=22@Fuel%20%26%20Air%20System&gid=11202@Idle%20Air%20Control%20Valve%20Hose
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Philly924S  



Joined: 20 Nov 2016
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Location: Philly Burbs

PostPosted: Wed Nov 23, 2016 12:05 pm    Post subject: Reply with quote

Thanks Paul.

The S hose under the IM looks tough to connect. Very little room. Any helpful hints?
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Thu Nov 24, 2016 4:01 am    Post subject: Reply with quote

Check Lindsey Racing for the hoses.

Frankly all that stuff is easier to change with the manifold off.
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Philly924S  



Joined: 20 Nov 2016
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Location: Philly Burbs

PostPosted: Thu Nov 24, 2016 4:53 am    Post subject: Reply with quote

Manifold is off. Injectors off to WitchHunter.

Rasta--do you think I should clean the ICV? If so, what would you use.

Thanks,
Alan
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Rasta Monsta  



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PostPosted: Thu Nov 24, 2016 5:23 am    Post subject: Reply with quote

Maybe Vaughan will chime in...he works for the manufacturer!

If the idle valve looks ok, it probably is, but if you want to clean it, I'd use some TB cleaner followed by compressed air.
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Philly924S  



Joined: 20 Nov 2016
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Location: Philly Burbs

PostPosted: Thu Nov 24, 2016 7:35 am    Post subject: Reply with quote

I think the ICV works as it should. The car developed rough idle when cold. It only started when the weather got cooler. Once at operating temp, the car ran fine. I know Porsche induction systems are sensitive to vacuum, and I attributed it to 30 year old vacuum hoses. That's why I started down this path. I also wanted to send the fuel injectors out for new seals, etc.

Could the ICV be malfunctioning ?
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Rasta Monsta  



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PostPosted: Thu Nov 24, 2016 7:54 am    Post subject: Reply with quote

There is a procedure on Clark's for setting the air bypass screw. Once that is correct, the ICV should be able to maintain idle within specs.

Bad run while cold could also be engine temp sensor. They do fail, and are easy and cheap to change.
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