 Pulsing At Idle |
|
|
|
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. |
|
|
| Jim C |
 May 18 2020, 08:24 AM
Post
#1
|
|
Member  Group: Members Posts: 206 Joined: 11-July 19 From: Pennsylvania Member No.: 23,294 Region Association: MidAtlantic Region 
 |
Want to see what the World thinks of this. I have a 1976 2.0 with FI. Injectors have been cleaned and checked, ECU repaired, CO checked, trigger points replaced, valves adjusted, timing set, but at idle it goes from barely running to 1000 RPM or so in a rhythmic manner. Also, when accelerating you can feel a momentary drop in power. Thoughts? (IMG:style_emoticons/default/confused24.gif)
|
   |
 
|
  |
Replies
| rjames |
Jun 4 2020, 09:45 AM
Post
#2
|
|
I'm made of metal Group: Members Posts: 4,447 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest
|
Have you tried adjusting the knob on your ECU? Try turning it clockwise a couple of clicks. EDIT- just saw that saigon71 suggested the same thing. I'd Also follow his advice to check the TPS and if the tracks look good, recalibrate it as I've read that if it's not set properly it can affect the idle.
It's true that a vacuum leak will mess with the idle, but it would then likely idle high. If it's not going above 1000rpms at idle and it bogs down when you step on the gas, the air/fuel ratio could be off. What's the history on this car? Is there signs that the MPS has been opened up? After making sure all of the hoses are connected correctly, I'd check these first because they are the easiest to do: Adjust ECU knob, Check MPS to see if it holds vacuum Check distributor vacuum canister to see if it holds vacuum Check TPS to see if it's worn & calibrate it correctly |
|
|
|
Posts in this topic
Jim C Pulsing At Idle May 18 2020, 08:24 AM
76-914 Vacuum leak. May 18 2020, 08:47 AM
dr914@autoatlanta.com I second that
Vacuum leak.
May 18 2020, 08:58 AM Jim C
Want to see what the World thinks of this. I have... May 18 2020, 09:02 AM BeatNavy
[quote name='Jim C' post='2816424' date='May 18 2... May 18 2020, 10:30 AM JamesM
I would have said something is making you run lea... Jun 4 2020, 12:07 PM alexkirkham
I would have said something is making you run le... Jun 4 2020, 01:26 PM dr914@autoatlanta.com that is an excellent thing that you did
[quote n... Jun 4 2020, 01:54 PM Jim C
Want to see what the World thinks of this. I hav... May 18 2020, 10:35 AM Literati914 Isn't there anything you can run thru the engi... May 18 2020, 10:46 AM StarBear
Isn't there anything you can run thru the eng... Jun 4 2020, 09:57 AM JeffBowlsby
Isn't there anything you can run thru the eng... Jun 4 2020, 01:24 PM Bleyseng I spray starting fluid in small amounts May 18 2020, 10:51 AM saigon71
Want to see what the World thinks of this. I have... May 18 2020, 03:52 PM Jim C I checked the vacuum hoses and replaced those that... Jun 4 2020, 08:41 AM Jim C
I checked the vacuum hoses and replaced those tha... Jun 4 2020, 08:42 AM Bleyseng Put a few drops of oil in the center shaft of the ... Jun 4 2020, 08:58 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 2nd April 2026 - 11:31 AM |
Invision Power Board
v9.1.4 © 2026 IPS, Inc.