 Blowing smoke, ...when going downhill |
|
|
|
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. |
|
|
  |
| boxsterfan |
 Apr 19 2014, 04:58 PM
Post
#1
|
|
914's are kewl  Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California  |
When travelling down a light grade (3-4%) this morning, my 74 2.0L let out quite a bit of smoke. Basically, I was in 3rd gear, roughly 3,000 RPM, foot OFF the gas, clutch pedal NOT depressed.
Where is this likely coming from? Something dripping on the heat exchangers? |
   |
 
|
| TheCabinetmaker |
Apr 19 2014, 05:32 PM
Post
#2
|
|
I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
You need someone to drive behind you and have them determine if the smoke is coming from the tail pipe. What you describe(smoke on decel) indicates worn valve guides.
|
 |
|
| Elliot Cannon |
Apr 19 2014, 06:45 PM
Post
#3
|
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
|
Exactly the problem I had on the way to RRC. Leaking valve guide dripping onto headers. Only happened going down hill until it started happening all the time. (IMG:style_emoticons/default/laugh.gif)
|
|
|
|
| stugray |
Apr 19 2014, 06:50 PM
Post
#4
|
|
Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE Leaking valve guide dripping onto headers. I thought that a leaking valve (exhaust) guide meant that exhaust is exiting through the valve cover (crankcase). A leaking intake valve guide would leak oil into the intake valve. (which would be worse under engine braking) How could a leaking valve guide leak onto a header? Do you mean a leaking pushrod tube? |
|
|
|
| Elliot Cannon |
Apr 19 2014, 07:02 PM
Post
#5
|
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None
|
I wished mine had been a push rod tube. I was really hoping for a leaking valve cover gasket but, alas, it wasn't either of those. Besides I seal my push rod tubes with hi temp silly cone. They never leak. (IMG:style_emoticons/default/av-943.gif)
|
|
|
|
| bdstone914 |
Apr 19 2014, 10:33 PM
Post
#6
|
|
bdstone914 Group: Members Posts: 4,515 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(The Cabinetmaker @ Apr 19 2014, 04:32 PM)  You need someone to drive behind you and have them determine if the smoke is coming from the tail pipe. What you describe(smoke on decel) indicates worn valve guides. (IMG:style_emoticons/default/agree.gif) The engine will suck oil through the exhaust guides when off throttle. Get some one in back of you to check to see if it is coming from the exhaust. If that is the case you can put it is neutral until you choose to make the repair. BRuce |
|
|
|
| stugray |
Apr 19 2014, 11:40 PM
Post
#7
|
|
Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE The engine will suck oil through the exhaust guides when off throttle. Ah.. yes, so when Elliot said QUOTE leaking valve guide dripping onto headers. He meant INTO headers...... that makes sense |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 4th May 2024 - 07:51 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.