Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Drops to idle fast and then chokes
p914
post Sep 16 2004, 01:45 PM
Post #1


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
I have the DJet system on my 75 2.0.
When the engine is all warmed up, and i come to a stop and the engine drops to idle, it sputters and chokes. Then if it continues to run it will slowly ramp back up to proper idle. Sounds like it just drops down to idle too fast for the old DJet.

The engine runs like a top except for when it is warmed up and that little idle problem kicks in.

Is there anything that can slow down the revs so it doesn;t just drop down to idle other than using the gas pedal? I took off all the air pump stuf years ago, so that system is not there anymore.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Sep 17 2004, 07:39 AM
Post #2


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
I have the same problem...Been asking, but no one has helped so far...

Tried all the vaccuum leak theories, sprayed so much brake and carb cleaner, all the paint is gone...

Mine is electrical because it occurs mostly with the lights etc. on...

This weekend, I'm going to tighten the Alt belt (new one) and see if that makes a difference and check voltage through various points on the motor...

Do you have an RPM hunt problem or is your idle steady once it comes back...

Do you have a decel valve installed...Mine (1975 2.0)does not...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
michelko
post Sep 17 2004, 07:45 AM
Post #3


Senior Member
***

Group: Members
Posts: 867
Joined: 30-November 03
From: Germany, Lambsheim
Member No.: 1,404
Region Association: None
hi,
try this link http://members.rennlist.com/pbanders/idle.htm maybe it is usefull.

(IMG:style_emoticons/default/smilie_flagge6.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Sep 17 2004, 07:50 AM
Post #4


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
Thanks michelko, I'll give it a try...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RustyWa
post Sep 17 2004, 08:10 AM
Post #5


Working Member
***

Group: Members
Posts: 610
Joined: 2-January 03
From: Kent, WA
Member No.: 72
Won't it do that if the car is lean? Maybe try a few clicks rich on the ECU....? Just an easy thought.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tod914
post Sep 17 2004, 08:34 AM
Post #6


Advanced Member
****

Group: Members
Posts: 3,755
Joined: 19-January 03
From: Lincoln Park, NJ
Member No.: 170
Maybe test your head temp. sensor???
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 17 2004, 08:36 AM
Post #7


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
Mine doesn't hunt as the mixture is good. It will slowly come up to steady idle after it drops when I come to a stop. I believe my decel valve is not there either. All the electrical is good and alternator is tight.
This is the only little quirk that I haven;t ironed out. Been a while since I looked on rennlist and will try that.
Thanks for reminding me.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2-OH!
post Sep 17 2004, 11:17 AM
Post #8


Senior Member
***

Group: Members
Posts: 552
Joined: 17-October 03
From: Santa Clarita, Kalifornication
Member No.: 1,253
Tod:

New head sensor...Put one in during the engine rebuild...

Rusty:

Yea...I just read the article that michelko suggested and I will try the ECU Lean/Rich adj. tonite...I am about one click to clockwise of centered, now...

We'll see...

The article michelko suggested, said to check the "idle " Rich/Lean adjustment...Are we talking about the same adjustment (ECU Knob) or is there another one I don't know about...

Thanks guys...

2-OH!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Sep 17 2004, 12:48 PM
Post #9


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
Along with the ecu adj. you may need to adjust the idle screw on the intake.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Oct 7 2004, 11:43 AM
Post #10


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
It needed a valve adjustment. Didn't put more than 3-4K miles on it since the last adjustment.
Cured the die out problem.
Thanks for the input guys.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rhodes71/914
post Oct 7 2004, 11:53 AM
Post #11


Glacier
***

Group: Members
Posts: 1,374
Joined: 8-August 04
From: End of the Road, Alaska
Member No.: 2,482
QUOTE(p914 @ Oct 7 2004, 09:43 AM)
It needed a valve adjustment. Didn't put more than 3-4K miles on it since the last adjustment.
Cured the die out problem.
Thanks for the input guys.

Looks like you were right on time for that valve adj.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Oct 7 2004, 12:14 PM
Post #12


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
Seems like adjustments would last up to 6k miles.. (IMG:style_emoticons/default/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Oct 7 2004, 12:18 PM
Post #13


Resident German
*************************

Group: Admin
Posts: 42,205
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(p914 @ Sep 16 2004, 12:45 PM)
Sounds like it just drops down to idle too fast for the old DJet.

check your Decel-Valve!

(IMG:style_emoticons/default/wink.gif) Andy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rhodes71/914
post Oct 7 2004, 12:34 PM
Post #14


Glacier
***

Group: Members
Posts: 1,374
Joined: 8-August 04
From: End of the Road, Alaska
Member No.: 2,482
QUOTE(p914 @ Oct 7 2004, 10:14 AM)
Seems like adjustments would last up to 6k miles.. (IMG:style_emoticons/default/confused24.gif)

From the first bus I owned I have always heard every 3K-4K miles. Makes for a lot of valve adjustments when taking a roadtrip form Alaska to the lower 48. Lets see - Parking garage in Seattle, friends driveway in Arizona, some campground in B.C. (thought I could make it back to AK, bus was runnig like crap). Just to name a few
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
p914
post Oct 7 2004, 03:33 PM
Post #15


Senior Member
***

Group: Members
Posts: 518
Joined: 7-September 03
From: Sunny South Florida
Member No.: 1,117
Region Association: None
I think the decel valve was taken out a year or so ago.
The valve adjustment did the trick.

oh well I guess if it is every 3-4k so be it.

There's a shop around the corner from mine that has a dyno, I think I'll have them hook it up to see what this old beast is putting out.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 9th May 2025 - 01:51 AM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
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 ...