 High idle problem with 2lt engine |
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| Creamsicle New Zealand |
 Jul 25 2016, 07:36 PM
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#21
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Member  Group: Members Posts: 83 Joined: 5-February 15 From: New Zealand Member No.: 18,403 Region Association: Australia and New Zealand  |
Thanks every one it will take me a couple of days to look into these suggestions. I will start with purchasing a vacuum pump then check the dizzy.
Cheers |
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| TheCabinetmaker |
Jul 25 2016, 07:41 PM
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#22
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I drive my car everyday Group: Members Posts: 8,309 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Like others have said, tps and mps won't make it idle higher. Vacuum leak will
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| Dave_Darling |
Jul 25 2016, 11:45 PM
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#23
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Over-advanced timing will also make the idle faster as well. That and vacuum leaks are the two main causes in D-jet cars.
One odd leak I have had (and others as well)--there are two supports inside the manifold. They're tubes going from the top to the bottom surface, inside the chamber. They can crack where they join up with the top or bottom of the manifold, which results in a leak. --DD |
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| porschetub |
Jul 26 2016, 01:12 AM
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#24
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Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(Creamsicle New Zealand @ Jul 26 2016, 01:36 PM)  Thanks every one it will take me a couple of days to look into these suggestions. I will start with purchasing a vacuum pump then check the dizzy. Cheers No need to use a vacuum pump,put a long piece of hose on there suck on it and check the movement on the advance plate,it you block the hose it should stay put,release suction it should snap but to rest,if the movement of the advance plate is sluggish the dizzy needs to be cleaned or you may free it up by turning the rotor back and forward and use a little lube. Put the lube down the top of the shaft after removing the rotor. These later aircooled distributors such as yours have a real habit of sticking up on the advance plate ask me how I know....I used to overhaul them. Is this the car you had imported to NZ that Mc Mark restored??,seem to remember that. Good luck from a fellow kiwi (IMG:style_emoticons/default/beer.gif) P.S. make sure your timing is spot on. |
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| Spoke |
Jul 26 2016, 05:50 AM
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#25
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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QUOTE(The Cabinetmaker @ Jul 25 2016, 09:41 PM) ...mps won't make it idle higher... I'm curious why the MPS couldn't make the idle higher. When I re-installed the FI on my engine, the MPS wouldn't hold vacuum at all. Thus a huge vacuum leak. Does it matter where the air is getting in? If the MPS is leaking, yes the engine would likely run richer. If air is getting in as well there is more air and more fuel = ??? |
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| TheCabinetmaker |
Jul 26 2016, 06:47 AM
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#26
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I drive my car everyday Group: Members Posts: 8,309 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
When the mps diaphragm fails it goes full rich. With no extra air it floods with fuel. If your vacuum hose is leaking you get extra air and a higher idle. Kinda like the aar. A controlled vacuum leak. I could be wrong (done that once or twice) but that is my experience.
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