 Can somebody ID this new idle quirk?, starts & runs well -- until warm |
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| Prospectfarms |
 May 31 2011, 10:43 PM
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#1
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Member  Group: Members Posts: 495 Joined: 7-March 11 From: Louisville, KY Member No.: 12,801 Region Association: Upper MidWest  |
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O.K., I'm better now... D-jet is driving me to drink. The 1.7 starts and runs well until it warms up. After 10 min. idling smoothly @ 900 it hesitates two or three times and stops idling at all, which means I can't keep it running long enough to set the timing. I can keep it going by feathering the throttle, but my nice smooth idle is gone. I reproduced the symptom three times in a row today. By clamping off the Vac hoses one-by-one it appears the FI components seem to be doing what they're supposed to. No other vacuum or capacitance probs. found so far. Haven't checked the injectors. This started after I repaired the ground strap on my distributor -- must have bumped something else. CHT? I have the FI diagnostic checklists and am working on them. If this was a carburetor I'd say it was running with a clogged idle jet (IMG:style_emoticons/default/wacko.gif) . These symptoms seem specific and uncommon. At least I've not seen others posts that describe the same thing. Did I miss one? |
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| TheCabinetmaker |
Jun 1 2011, 07:17 AM
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#2
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I drive my car everyday Group: Members Posts: 8,339 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
The cold start valve does not come on till the air temp hits about 40F.
The Auxiliary air regulator however, will open up on a 60 degree morning to give extra rpms during warm up. after about 10 minutes it should close and the idle come back to 900 (or wherever its is set). You may just have the idle set to low, or the throttle position switch may need to be reset. A mis adjusted tps will render the idle mixture knob on the ecu useless. |
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| Bartlett 914 |
Jun 1 2011, 07:47 AM
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#3
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Advanced Member Group: Members Posts: 2,218 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
QUOTE(vsg914 @ Jun 1 2011, 08:17 AM)  The cold start valve does not come on till the air temp hits about 40F. The CSV does not come on unless the air temperature is Below 40 maybe even colder. Unless it is leaking, it should not be a problem here. |
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| Prospectfarms |
Jun 1 2011, 07:50 AM
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#4
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Member Group: Members Posts: 495 Joined: 7-March 11 From: Louisville, KY Member No.: 12,801 Region Association: Upper MidWest |
QUOTE(Bartlett 914 @ Jun 1 2011, 09:47 AM) QUOTE(vsg914 @ Jun 1 2011, 08:17 AM) The cold start valve does not come on till the air temp hits about 40F. The CSV does not come on unless the air temperature is Below 40 maybe even colder. Unless it is leaking, it should not be a problem here. Great minds think alike. Needed to know that. Thanks. |
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Posts in this topic
Prospectfarms Can somebody ID this new idle quirk? May 31 2011, 10:43 PM
kg6dxn Try this...
L Jet Manual May 31 2011, 10:52 PM
Prospectfarms
Try this...
L Jet Manual
Thnkz Mike,
Although... Jun 1 2011, 06:16 AM SirAndy CHT?
Could be. I have seen this exact behavior wh... May 31 2011, 10:54 PM Prospectfarms
CHT?
Could be. I have seen this exact behavior w... Jun 1 2011, 06:46 AM Prospectfarms
The cold start valve does not come on till the ai... Jun 1 2011, 07:46 AM underthetire Yep, i'll bet AAR myself. Should idle about 15... Jun 1 2011, 08:33 AM vsg914 Unplug the hose to the AAR at the air cleaner and ... Jun 1 2011, 08:38 AM Tom From above;
Great info! thanks. Assumed inc... Jun 1 2011, 01:53 PM Prospectfarms
From above;
The ECU adjusts fuel mixture b... Jun 1 2011, 10:43 PM Bartlett 914
I think the idle screw is at the end of its t... Jun 2 2011, 07:56 AM charliew Tom, is it really Magala Red? Jun 1 2011, 04:28 PM ThinAir Even though this problem started after a specific ... Jun 1 2011, 10:56 PM Prospectfarms
Generally with D-Jet systems you want to start wi... Jun 2 2011, 04:48 AM Tom The information I have is Paul Anders' stuff a... Jun 2 2011, 10:42 AM Prospectfarms
The information I have is Paul Anders' stuff ... Jun 2 2011, 11:15 AM r_towle Unplug and cap all vacuum lines at the plenum.
the... Jun 2 2011, 11:13 AM Prospectfarms
Unplug and cap all vacuum lines at the plenum.
th... Jun 2 2011, 11:28 AM r_towle
Unplug and cap all vacuum lines at the plenum.
t... Jun 2 2011, 11:44 AM r_towle look in the classics forum here for Cap'n crus... Jun 2 2011, 11:17 AM Prospectfarms
look in the classics forum here for Cap'n cru... Jun 7 2011, 08:36 PM Prospectfarms PS: Ill go through those procedures, set valve cle... Jun 2 2011, 11:34 AM benalishhero Open loop in modern EFI systems refers to the engi... Jun 2 2011, 05:55 PM Prospectfarms Thanks benalishhero, So the word "open" ... Jun 2 2011, 06:42 PM Prospectfarms
Unplug and cap all vacuum lines at the plenum.
th... Jun 4 2011, 09:46 PM Prospectfarms Follow up and diagnosis. Ultimately it was the fue... Jun 15 2011, 10:08 PM ThinAir Besides, starting with the basics, the other thing... Jun 4 2011, 11:04 PM Prospectfarms
It's sounding a bit to me like a solder point... Jun 5 2011, 06:13 AM Prospectfarms Update:
Pulled ECU and tested resistance of CHT ... Jun 5 2011, 12:00 PM Prospectfarms
Update:
Here's what I am presently dealing ... Jun 5 2011, 10:03 PM Prospectfarms ThinAir, did you do more work on your son's 91... Jun 7 2011, 08:06 AM Tom You should measure the value of the CHT when it is... Jun 6 2011, 07:18 AM Prospectfarms
You should measure the value of the CHT when it i... Jun 6 2011, 08:03 AM Prospectfarms
You should measure the value of the CHT when it ... Jun 6 2011, 09:59 AM Tom I have heard of cracked plenums causing a vacuum l... Jun 6 2011, 12:08 PM Prospectfarms
I have heard of cracked plenums causing a vacuum ... Jun 6 2011, 12:55 PM ThinAir This actually all started with this: http://www.91... Jun 7 2011, 03:36 PM Prospectfarms
This actually all started with this: http://www.9... Jun 7 2011, 08:22 PM speed metal army give us the part # of that pump! :) Jun 15 2011, 10:23 PM Prospectfarms
give us the part # of that pump! :)
Began ... Jun 15 2011, 10:36 PM ThinAir Congratulations on figuring it out! Persistenc... Jun 16 2011, 12:47 AM |
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