 D-Jet: Can you compensate for Throttle Shaft air leak? |
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| jrmdir |
 Dec 7 2021, 02:37 PM
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Member  Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest 
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After months of chasing a rich condition on my '73 1.7 I decided to once again try pressurizing the system and applying soapy water. Glad I did because I found two more leaking hoses and a leaking Cold Start Valve gasket. But the worst culprit turned out to be a leak around the throttle shaft.
There are a number of threads about options for adding bushings and or seals, but am I right in thinking this would mainly impact idle mixture? If so, I'm wondering if other system adjustments, e.g. ECU knob and/or MPS could overcome the effects of this leak - at least until I find a machine shop to fix the TB. Thanks in advance for any suggestions. Ron |
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Posts in this topic
jrmdir D-Jet: Can you compensate for Throttle Shaft air leak? Dec 7 2021, 02:37 PM
emerygt350 How much left on the idle adjust screw? If that i... Dec 7 2021, 03:24 PM JamesM Leak wont affect mixture with d-jet, just idle spe... Dec 7 2021, 03:38 PM
914_teener
Leak wont affect mixture with d-jet, just idle sp... Dec 7 2021, 09:15 PM emerygt350 Little curious about a rich condition and vacuum l... Dec 7 2021, 03:41 PM r_towle It’s unmeasured air.
I agree that you could turn... Dec 7 2021, 06:26 PM emerygt350
It’s unmeasured air.
Which should lead to a ... Dec 7 2021, 06:47 PM jcd914
It’s unmeasured air.
Which should lead to a... Dec 7 2021, 07:01 PM Dave_Darling
So vacuum leaks in D-jet cause a rich mixture.
... Dec 7 2021, 10:24 PM JamesM
It measures manifold vacuum and temperature.
The ... Dec 8 2021, 01:13 AM JamesM
It’s unmeasured air.
I agree that you could tur... Dec 7 2021, 07:00 PM r_towle
It’s unmeasured air.
I agree that you could tu... Dec 7 2021, 10:26 PM emerygt350 I never really connected that with idle. I assume... Dec 7 2021, 09:17 PM 914_teener
I never really connected that with idle. I assum... Dec 7 2021, 09:32 PM jrmdir Thanks to everyone for the great input.
I had a D... Dec 8 2021, 08:51 AM emerygt350 Just out of curiosity, what do your plugs look lik... Dec 8 2021, 10:29 AM  |
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