 High idle problem with 2lt engine |
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| Creamsicle New Zealand |
 Jul 24 2016, 10:43 PM
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Member  Group: Members Posts: 84 Joined: 5-February 15 From: New Zealand Member No.: 18,403 Region Association: Australia and New Zealand  |
Hi all, I'm wondering if any one could help me with a problem I have. When either cold or hot my engine runs at 1600RPM. I have looked for any air leaks, all the hoses are new. The only things I can find are the following - After removing the throttle body I noticed the surface the gaskets sits on is uneven due to powder coating so I sanded this area back to bare metal and it is a lot flatter, this had no effect on the RPM. When the engine is cold I can block of the air hose going to the cold running injector and the revs come down to about 1200RPM, as the engine gets warm the cold running injector stops operating as it should. The air intake valve on the side of the throttle body is wound fully in but the valve does not appear to seat properly, when I hold it up to the light I can see gaps both side of the valve, is this normal?
The other thing I noticed when holding the throttle body up to the light was the butterfly valve in the throttle body has gaps around most of the sides of it when closed, is this normal or is this an indication of wear? In the butterfly valve is a hole approx. 3mm. When I block this off the revs come back to 1100RPM which is getting closer to what it should be. Any one have any thoughts on this please? Thanks Steve |
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| 914_teener |
Jul 25 2016, 06:33 PM
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914 Guru Group: Members Posts: 5,270 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
QUOTE(jcd914 @ Jul 25 2016, 04:03 PM)  The TPS can be mis-adjusted and prevent the throttle (butter fly) from closing all the way. It holds it open a little which of cource creats a high idle. Check the adjustment, if you have not already. I have seen the distributor advance stuck advanced and cause a high idle. Many people forget to lube the distributor advance as part of maintenance. Jim Yep (IMG:style_emoticons/default/agree.gif) Quick way to check is use the aforementioned HF pump...take the dizzy cap off and pull vacuum on the advance pot and them the retard pot if you have one. See if the advance plate moves fully and that tje diaphram will hold vacuum. Best way to clean and lube the dizzy is to take it out of the car. IMH experience. |
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Posts in this topic
Creamsicle New Zealand High idle problem with 2lt engine Jul 24 2016, 10:43 PM
Jeff Bowlsby Appears you have a vacuum leak somewhere, its typi... Jul 24 2016, 11:13 PM
Creamsicle New Zealand
Appears you have a vacuum leak somewhere, its typ... Jul 24 2016, 11:48 PM OU812 Had same problem with the 2.0 liter
Turned out th... Jul 25 2016, 07:29 AM Creamsicle New Zealand
Had same problem with the 2.0 liter
Turned out t... Jul 25 2016, 02:18 PM The Cabinetmaker
Had same problem with the 2.0 liter
Turned out ... Jul 25 2016, 02:41 PM era vulgaris Throttle Position Switch Jul 25 2016, 02:24 PM Chris H. Throttle Position Switch/Sensor.
It's also ... Jul 25 2016, 02:26 PM Jeff Bowlsby I think he was referring to the throttle body itse... Jul 25 2016, 02:49 PM The Cabinetmaker
I think he was referring to the throttle body its... Jul 25 2016, 03:24 PM OU812
I think he was referring to the throttle body its... Jul 25 2016, 06:37 PM 914_teener I don.t know if you are running the stock distribu... Jul 25 2016, 03:04 PM Jeff Bowlsby
I don.t know if you are running the stock distrib... Jul 25 2016, 03:33 PM Creamsicle New Zealand Thanks for the input, TPS seems OK from what I can... Jul 25 2016, 04:14 PM Spoke I looked through your thread but couldn't tell... Jul 25 2016, 04:36 PM Rand 2L is Djet. I wouldn't suspect the MPS because... Jul 25 2016, 04:49 PM Amphicar770 You can also take an unlit propane torch and probe... Jul 25 2016, 04:54 PM jcd914 The TPS can be mis-adjusted and prevent the thrott... Jul 25 2016, 05:03 PM 914_teener ...there is a small ball bearing under the plate I... Jul 25 2016, 06:36 PM Creamsicle New Zealand Thanks every one it will take me a couple of days ... Jul 25 2016, 07:36 PM porschetub
Thanks every one it will take me a couple of days... Jul 26 2016, 01:12 AM The Cabinetmaker Like others have said, tps and mps won't make ... Jul 25 2016, 07:41 PM Spoke
...mps won't make it idle higher...
I'm... Jul 26 2016, 05:50 AM Dave_Darling Over-advanced timing will also make the idle faste... Jul 25 2016, 11:45 PM The Cabinetmaker When the mps diaphragm fails it goes full rich. Wi... Jul 26 2016, 06:47 AM |
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