 Possible decel valve problem, Idle likes to drop to zero after warmed up. |
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| boxsterfan |
 Oct 9 2013, 02:20 PM
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914's are kewl  Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California  |
1974 2.0L D-Jet
Once the engine gets warmed up, my engine RPM likes to drop down to zero when letting off the gas. This is not just a "gauge" bouncing issue but rather you can feel that the motor has dropped to zero (stalling). Does this sound like a condition that can occur because of a faulty decel valve? Anyone in San Ramon, CA have a known working spare one i could test with? Part#: U039133551 Referred to affectionately as a decel valve, this factory installed device lets the idle down slowly to more effectively limit the unburned gas exiting the tail pipe and keep the engine from stalling. mounts on the right side of the firewall just above the pressure sensor and just behind the battery and three vacuum lines attach to it. |
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| 76-914 |
Oct 9 2013, 03:42 PM
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,876 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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What's your idle rpm when it's cold and before it warms to stall condition?
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| boxsterfan |
Oct 9 2013, 11:45 PM
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
QUOTE(76-914 @ Oct 9 2013, 02:42 PM)  What's your idle rpm when it's cold and before it warms to stall condition? Idle RPM (eyeballing it) is 800-900 at cold but it is rough (drops down a little and then back to 800-900. After warm-up, seems to idle very well. Then after a while (and getting warmed up even further?), I then experience these issues where the car is stalling (Example: Driving 45 Mph, approaching stop-sign, let off gas, depress clutch. Engine drops to zero (and not just a bouncy gauge). Idle can be rough like when cold (or worse) and it will stall if you don't give more than usual gas when taking off again. |
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Posts in this topic
boxsterfan Possible decel valve problem Oct 9 2013, 02:20 PM
Java2570 I think typically the decel valve starts leaking a... Oct 9 2013, 02:28 PM Java2570 I'd look at fuel pressure, possible fuel deliv... Oct 9 2013, 02:41 PM The Cabinetmaker I agree. Remove the hoses and plug them. Take the ... Oct 9 2013, 03:38 PM r_towle Remove and plug the AAR, decel! and all other ... Oct 9 2013, 09:09 PM boxsterfan Thanks everyone. I will troubleshoot this weekend.... Oct 9 2013, 10:46 PM Philip W.
Remove and plug the AAR, decel! and all other... Oct 10 2013, 08:30 AM
boxsterfan
Remove and plug the AAR, decel! and all othe... Oct 10 2013, 10:13 AM worn
How do you adjust the MPS? I know this part is ... Oct 10 2013, 11:33 AM Philip W.
How do you adjust the MPS? I know this part is... Oct 10 2013, 12:29 PM worn
I guess i like to tinker with these things, and... Oct 10 2013, 01:21 PM Philip W.
I guess i like to tinker with these things, an... Oct 10 2013, 06:45 PM 76-914 :agree: Oct 10 2013, 09:04 AM rick 918-S I just fired up a rebuilt 2.0 I took it for a driv... Oct 10 2013, 07:05 PM r_towle
I just fired up a rebuilt 2.0 I took it for a dri... Oct 10 2013, 08:14 PM boxsterfan
I just fired up a rebuilt 2.0 I took it for a dri... Oct 10 2013, 09:17 PM |
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