 914 with the hiccups |
|
|
|
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. |
|
|
  |
| JWest |
 Sep 29 2003, 11:13 AM
Post
#1
|
|
Senior Member  Group: Members Posts: 1,662 Joined: 6-January 03 From: Fort Worth, TX Member No.: 97 Region Association: None 
 |
'74 2.0 stock FI. Ignition parts are all recent. Nothing was touched for a couple weeks before the problem started.
It is an intermitent misfire, can buck the car pretty good depending on the gear and speed. Not related to outside temp, not related to engine temp. It may do it once every 30 seconds at the highest frequency, sometimes it seems to be gone for entire trips. Does not seem to be RPM related. The tach does not move (flich or drop) when it occurs. It does it steady-state cruise, mild acceleration, light decel, I have not noticed it at idle or hard accel, but I may just not have hit it at that time (can't rule it out). I cleaned the fuses, cleaned and swapped the relays on the relay board, and threw another coil on it just for the heck of it. What do you suggest next? I was planning on swapping the relay board (have a few) and cleaning the throttle switch, next. |
   |
 
|
| Nemo914 |
Sep 29 2003, 12:04 PM
Post
#2
|
|
Member Group: Members Posts: 76 Joined: 11-July 03 From: Cape Cod, MA Member No.: 902 |
My car was doing this a year ago, and it turned out the the head temperature sensor wasn't making a good connection. It "looked" connected in its plastic sleeve, but was loose. Check that and the throttle switch. A bad throttle switch can do the same thing (so I hear).
|
|
|
|
| JWest |
Sep 29 2003, 12:09 PM
Post
#3
|
|
Senior Member Group: Members Posts: 1,662 Joined: 6-January 03 From: Fort Worth, TX Member No.: 97 Region Association: None
|
Ah yes, Jeff (PO) told me that the head temp sensor was loose when he got the car and he fixed that. Maybe it has worked itself out again.
Thanks! |
|
|
|
| SirAndy |
Sep 29 2003, 12:35 PM
Post
#4
|
|
Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(James Adams @ Sep 29 2003, 10:13 AM) I cleaned the fuses, cleaned and swapped the relays on the relay board, and threw another coil on it just for the heck of it. are all the spark-plug wires connected tight on both ends? and i mean tight (IMG:style_emoticons/default/wink.gif) Andy |
 |
|
| need4speed |
Sep 29 2003, 12:38 PM
Post
#5
|
|
Member Group: Members Posts: 339 Joined: 11-April 03 From: Arroyo Grande, CA Member No.: 564 |
Now here's a perfect example of why this list ROCKS!
|
|
|
|
| JWest |
Sep 29 2003, 12:47 PM
Post
#6
|
|
Senior Member Group: Members Posts: 1,662 Joined: 6-January 03 From: Fort Worth, TX Member No.: 97 Region Association: None
|
QUOTE(SirAndy @ Sep 29 2003, 10:35 AM) are all the spark-plug wires connected tight on both ends? and i mean tight (IMG:style_emoticons/default/wink.gif) Andy They've been off and back on but it wouldn't hurt to check again... |
|
|
|
| garyh |
Sep 29 2003, 03:52 PM
Post
#7
|
|
Member Group: Members Posts: 170 Joined: 8-January 03 From: San Mateo, CA Member No.: 114 |
Another popular culprit is the throttle position sensor.
They can (and do) wear out from being held at the same point for long periods of time. A leaky MPS will aggravate the problem at crusing and light acceleration. G. |
|
|
|
| TheCabinetmaker |
Sep 29 2003, 06:39 PM
Post
#8
|
|
I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
The tps sounds like the culprit, but the accelerator cable sould also be at fault. It doesen't like to be too tight. Give it a little slack.
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 21st May 2024 - 04:16 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.