My '75 2.0 idles fast when hot.
I have replaced all the hoses and injector seals, adjusted the timing, done all the tune-up stuff, etc. I suspect there may be an air leak, but I'm running out of places to find it.
The only place I haven't refurbished yet is around the plenum. I want to take that out next, clean it up, paint the intake tubes, replace any gaskets/seals, etc. But I haven't been there yet, so I'm hoping for some input - photos of the disassembled parts would be nice.
Throttle-body gaskets, the short pieces of hose that connect/seal the intake tubes to plenum (what do you call those???).... what else do I need? Anything tips before I dig in?
You've checked your AAR?
QUOTE (Rand @ Dec 3 2005, 02:53 PM) |
My '75 2.0 idles fast when hot. I have replaced all the hoses and injector seals, adjusted the timing, done all the tune-up stuff, etc. I suspect there may be an air leak, but I'm running out of places to find it. The only place I haven't refurbished yet is around the plenum. I want to take that out next, clean it up, paint the intake tubes, replace any gaskets/seals, etc. Throttle-body gaskets, the short pieces of hose that connect/seal the intake tubes to plenum (what do you call those???).... what else do I need? Anything tips before I dig in? |
Thanks guys.
Not the AAR. Every single port that goes into the airbox has been ruled out... except the Cold start valve. Looking at that now too.
I wouldn't have suspected the plenum, but it's just about the last place left to look. I figure I'll enjoy the experience of seeing it apart and cleaning/painting while I'm at it.
Have you changed the injector seals yet? Runners to head gaskets?
I would test for leaks spraying starting fluid lightly around the known leaks spots while the motors running.
Geoff
QUOTE (Bleyseng @ Dec 3 2005, 07:39 PM) |
Have you changed the injector seals yet? Runners to head gaskets? I would test for leaks spraying starting fluid lightly around the known leaks spots while the motors running. Geoff |
I have replaced the injector seals.
Runners to head gaskets? Not yet.
Did the spray test, but used carb cleaner (carefully of course)... Isn't that supposed to work like starting fluid?
it kinda works....I like ole fashion starting fluid as the "leak" shows up instantly. Don't spray much....just alittle here see what happens, then some here etc. If you start spraying alot everywhere it will get sucked into the TB intake and that is why the rpms go up.
Maybe we can hook up....and I'll take a look see.
QUOTE |
Maybe we can hook up....and I'll take a look see. |
Intake Manifold Hoses
Old manifold hoses have a tendency to crack and leak, causing a variety of fuel injection problems. New replacements are worth more than enough in saved headaches while troubleshooting injection problems. Note, the 1.7 manifold hoses are no longer available, however, the 1.8/2.0 hoses can be used as a replacement if you hose clamp them to the runners and the air plenum. Sold per each.
Intake Manifold Hose, each, 914 1.7 (1970-73)
Brand: Genuine Porsche
022-133-241B-OEM $6.75
Intake Manifold Hose, each, 914 1.8L/2.0L (1973-76)
Brand: Contitech [Photo] [Photo]
039-133-241-M21 $8.50
http://www.pelicanparts.com/catalog/shopcart/9144/POR_9144_FULint_pg1.htm
Thanks Ron.
Ok, $30 or so with shipping is better than $42. But we're still talking about a few inches of hose here. It's not a high-pressure or high-heat application... Seems to me it just needs to be air tight? So what's wrong with using pieces of the rubber hose I have on hand and clamping with hose clamps?
Sorry for I just want to understand how it's justified.
Thanks.
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