High Idle, but only when driving or warm., Cold, and sitting... 1000 RPM. Driving...1400 ?? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
High Idle, but only when driving or warm., Cold, and sitting... 1000 RPM. Driving...1400 ?? |
MikeInMunich |
Aug 4 2016, 02:44 AM
Post
#1
|
Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
Greetings from Munich gentlemen!
As seen in the title, my car (1973 1.7 converted to 2 liter, D-Jettronic F.I.) idles at 1000 after starting and letting it sit. When I take it out in the road it quickly changes to 1400. It still idles at 1400 when stopped after the car is warm. 1) I think my AAR (auxiliary air regulator) valve isn't working at all. Disconnecting the vacuum hose, the idle shot up to about 3000 and covering it with my finger 100% it went back down to where it was before I had detached it from the AAR. So the AAR should have been OPEN as the car wasn't warm yet, but it seems to be closed 100%. Strangely, the idle only goes up after the car is out on the road / is warm...but not even yet near normal operating temperature. I'm thinking the AFR is leaning out under load and after the car is fully warmed up. (IMG:style_emoticons/default/idea.gif) I currently don't have AFR or CO values. I will have the CO measured cold and after warming up in a few days. Here's another issue and question fer y'all. While looking into the bay yesterday I noticed a substantial leak at one of the fuel injectors. I didn't mess with it much (checking the seating of the seal) but after I drove the car and it was warm, I looked again and it had stopped leaking. I thought it could have something to do with temp and fuel pressure (IMG:style_emoticons/default/confused24.gif) Starting up the car cold this morning however, I checked again, and there was still no leak. Does anyone have any idea what could cause an apparently intermittent leak like this? Perhaps just fudging with it gently got a seal to sit better, but I'm skeptical about that. Thanks for your feedback! (IMG:style_emoticons/default/beerchug.gif) By the way, I do know about this thread on Rennlist, which is a tremendous resource: http://members.rennlist.com/pbanders/djetparts.htm Mike in Munich |
MikeInMunich |
Aug 25 2016, 08:57 AM
Post
#2
|
Member Group: Members Posts: 392 Joined: 19-November 13 From: Munich, Germany Member No.: 16,674 Region Association: None |
Update!
I got the AAR to work by letting it soak in WD40 for a day. Searching for a vacuum leak by spraying brake cleaner all over the place in the engine compartment, practically, the idle would drop from 1400 to under 1000 when I sprayed the "tip" of the fuel regulator, where there is an 11mm screw, which I couldn't easily get to turn in either direction (at all). I was curious, but pursued that attempt no further. Does this tell us anything? (IMG:style_emoticons/default/confused24.gif) Also, my fuel leak at the O ring of the injector is intermittent. Sometimes when I start the car up its leaking quite badly and more often than not, it's not leaking at all. Any ideas on why this could be the case? (IMG:style_emoticons/default/confused24.gif) Thanks guys! Really appreciate your help a LOT! All the best from sunny Munich, Mike (IMG:style_emoticons/default/smilie_flagge6.gif) |
boxsterfan |
Aug 25 2016, 09:18 AM
Post
#3
|
914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
Update! I got the AAR to work by letting it soak in WD40 for a day. Searching for a vacuum leak by spraying brake cleaner all over the place in the engine compartment, practically, the idle would drop from 1400 to under 1000 when I sprayed the "tip" of the fuel regulator, where there is an 11mm screw, which I couldn't easily get to turn in either direction (at all). I was curious, but pursued that attempt no further. Does this tell us anything? (IMG:style_emoticons/default/confused24.gif) Also, my fuel leak at the O ring of the injector is intermittent. Sometimes when I start the car up its leaking quite badly and more often than not, it's not leaking at all. Any ideas on why this could be the case? (IMG:style_emoticons/default/confused24.gif) Thanks guys! Really appreciate your help a LOT! All the best from sunny Munich, Mike (IMG:style_emoticons/default/smilie_flagge6.gif) If your injector o-ring is leaking, you need to replace ASAP. Otherwise, you will have a fire on your hands. The o-rings are cheap. Install is pretty easy (heck, I did it). Have you grabbed the numbers off your ECU and MPS? http://members.rennlist.com/pbanders/index.html Look for this section: D-Jetronic D-Jetronic Injection System Fundamentals D-Jetronic Parts Table, Setup, and Troubleshooting Manifold Pressure Sensor (MPS) Analysis and Tuning D-Jetronic Electronic Control Unit (ECU) Analysis D-Jetronic PCV (Positive Crankcase Ventilation) Valve Analysis D-Jetronic Idle Stability and Troubleshooting D-Jetronic Testers Fuel Pump Circuit Troubleshooting Flow Charts (Framed Visio flow charts) D-Jetronic vs. Carburetors - The Endless Debate |
Lo-Fi Version | Time is now: 10th June 2024 - 03:57 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |