 Car Has No Compression On #4, ...can I take the valve cover off without draining oil? |
|
|
|
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. |
|
|
| 7TPorsh |
 Jun 30 2016, 12:30 PM
Post
#1
|
|
7T Porsh  Group: Members Posts: 2,691 Joined: 27-March 06 From: Glendale Ca Member No.: 5,782 Region Association: Southern California 
 |
A problem has recenly developed and I can't figure it out. The car starts up easy and on the first crank. I let it warm up a few minutes and drive....It drives fine as it's warming up.
Then after about 15 or 20 minutes the engine starts developing a shudder. Idles fine but and can run ok under low load but under some load the #4 cylinder starts popping and firing up through the carb. feels like it's running 3 cylinders and wasting gas. It's been suggested I do a compression test but I'm thinking if the engine runs great cold and while warmin up; the compression should be ok. Is there a case where comprression is ok when cold but low when hot? Can't figure out why car runs great when starts f'n up. 1.7 with dual weber 40 IDFs |
   |
 
|
Posts in this topic
7TPorsh Car Has No Compression On #4 Jun 30 2016, 12:30 PM
JmuRiz Sounds the opposite of a properly setup carb engin... Jun 30 2016, 01:19 PM 7TPorsh Did a compression test tonight.... 105 / 105 / 105... Jun 30 2016, 11:02 PM The Cabinetmaker Squirt some oil in the plug hole then retest compr... Jul 1 2016, 06:43 AM
7TPorsh
Squirt some oil in the plug hole then retest comp... Jul 1 2016, 08:24 AM Mark Henry
Squirt some oil in the plug hole then retest com... Jul 1 2016, 09:26 AM rfinegan Sounds like a tight valve ( held open) adjust and ... Jul 1 2016, 08:53 AM 7TPorsh
Sounds like a tight valve ( held open) adjust and... Jul 8 2016, 09:58 AM BK911 Leakdown Jul 1 2016, 10:44 AM JmuRiz :agree:
Leakdown will tell where the issue is, ri... Jul 1 2016, 01:15 PM era vulgaris You don't need to drain the oil to remove the ... Jul 8 2016, 11:45 AM Jetsetsurfshop
You don't need to drain the oil to remove the... Jul 8 2016, 02:01 PM ThePaintedMan ? you do not have to drain the oil to take a valv... Jul 8 2016, 12:15 PM stugray Leakdown test only works if you have SOME compress... Jul 8 2016, 12:25 PM HAM Inc Do a leakdown test. It will tell you where the lea... Jul 8 2016, 12:42 PM Dave_Darling Look at the valve tips when each cylinder is on TD... Jul 8 2016, 02:49 PM jcd914
Look at the valve tips when each cylinder is on T... Jul 8 2016, 05:16 PM 76-914
Look at the valve tips when each cylinder is on T... Jul 8 2016, 05:26 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 26th May 2024 - 01:03 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.