D-Jet Issues-getting close, Need a little more specific advice |
|
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. |
|
D-Jet Issues-getting close, Need a little more specific advice |
OU8AVW |
Mar 16 2015, 09:17 AM
Post
#1
|
Yacht Rigger Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region |
So I got my car back from the local Porsche shop and installed a rebuilt MPS from Bowlsby but the car is still not running right. Flat spots and intermittent dead fire misses. She starts right up, idles well and drives ok but when you get on it it has intermittent flat spots and when shes just cruising it misses once and a while. Seems like the advance is not ramping up like it should. Also, the mechanic left a vacuum line off the distributor. The line from the inboard connection on the pot is hooked up but the outside one is off. I understand that one of these is advance and one is retard.
Just need a list of crap to check (IMG:style_emoticons/default/biggrin.gif) |
DRPHIL914 |
Aug 28 2015, 11:40 AM
Post
#2
|
Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
It wanting to stall or slow idle cold be because it's still running too rich, or timing is still a bit off-i had the same issue(assuming the tps is set correctly). If your numbers are from a warmed up motor, you are rich at idle, part load and lean on wot. I think with air cooled and d-jet motor I would not want to be as lean at cruise as 16-17 as Rich stated. Maybe 13-14. Which is about where i have got mine to. I'm at that 12-13 at w.o.t., idle is about 10.5 cold and 11.5-12 when warmed up, I'd rather be a little on the rich side than on the lean.. I've read the power Is better right at the 13.7-14 . Check your plugs and see how the look , should give you some idea of where you are as well.
|
76-914 |
Aug 28 2015, 07:22 PM
Post
#3
|
Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,504 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
It wanting to stall or slow idle cold be because it's still running too rich, or timing is still a bit off-i had the same issue(assuming the tps is set correctly). If your numbers are from a warmed up motor, you are rich at idle, part load and lean on wot. I think with air cooled and d-jet motor I would not want to be as lean at cruise as 16-17 as Rich stated. Maybe 13-14. Which is about where i have got mine to. I'm at that 12-13 at w.o.t., idle is about 10.5 cold and 11.5-12 when warmed up, I'd rather be a little on the rich side than on the lean.. I've read the power Is better right at the 13.7-14 . Check your plugs and see how the look , should give you some idea of where you are as well. Those numbers I posted are quoted from Jake. But what does he know, right? |
OU8AVW |
Aug 29 2015, 06:48 PM
Post
#4
|
Yacht Rigger Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region |
It wanting to stall or slow idle cold be because it's still running too rich, or timing is still a bit off-i had the same issue(assuming the tps is set correctly). If your numbers are from a warmed up motor, you are rich at idle, part load and lean on wot. I think with air cooled and d-jet motor I would not want to be as lean at cruise as 16-17 as Rich stated. Maybe 13-14. Which is about where i have got mine to. I'm at that 12-13 at w.o.t., idle is about 10.5 cold and 11.5-12 when warmed up, I'd rather be a little on the rich side than on the lean.. I've read the power Is better right at the 13.7-14 . Check your plugs and see how the look , should give you some idea of where you are as well. Those numbers I posted are quoted from Jake. But what does he know, right? Is that waht you're seeing out of your 2056? I'm close to that, maybe 14.5 at cruise. Seems like a 1/8 turn on the inner screw will get me there. Car idels nice at 12.5. Also, at 8.56:1 compression, should I be running 92 octain? I'm getting some diesling when I tromp it. I've been using 89..... |
Lo-Fi Version | Time is now: 21st May 2024 - 09:30 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 ... |