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
> timing issue, timing light stops flashing for a split second every few seconds
DRPHIL914
post Oct 6 2018, 09:08 PM
Post #1


Dr. Phil
****

Group: Members
Posts: 3,348
Joined: 9-December 09
From: Bluffton, SC
Member No.: 11,106
Region Association: South East States



so its missing every few seconds or so.
like when the heart skips a beat. So how or why would this happen- is it the points module?(hot spark) , seems like the most likely thing. I am going to put the 123ignition distributor in tomorrow, and it will be interesting to see if it still happens.
that will eliminate the fi points plate and the hotspark module in the old distributor.

So has anyone else ever seen this when setting the timing on their car?? if so what did you conclude?

User is online!Profile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Oct 7 2018, 10:55 AM
Post #2


914 Idiot
**********

Group: Members
Posts: 13,849
Joined: 9-January 03
From: Silly-con Valley, CA
Member No.: 121
Region Association: Northern California



Since my car did not misfire or run any differently when the light dropped, I concluded that the problem was with the timing light. Most likely with the pickup clamped around the plug wire. Moving and repositioning the pickup usually fixed the problem--for that occurrence.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Oct 8 2018, 12:57 AM
Post #3


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 7,347
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California



Does a tachometer indicate any fluctuation in RPMs?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mblizzard
post Oct 8 2018, 12:29 PM
Post #4


Advanced Member
****

Group: Members
Posts: 2,736
Joined: 28-January 13
From: Knoxville Tn
Member No.: 15,438
Region Association: South East States



Also verify that the pick up clip is oriented in the correct direction indicated.

Most usually have an arrow that points toward plug. Hook up backwards and some strange things happen.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
porschetub
post Oct 8 2018, 01:14 PM
Post #5


Advanced Member
****

Group: Members
Posts: 2,677
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None



QUOTE(Mblizzard @ Oct 9 2018, 07:29 AM) *

Also verify that the pick up clip is oriented in the correct direction indicated.

Most usually have an arrow that points toward plug. Hook up backwards and some strange things happen.


My timing light did the same thing and it was a bad contact in the #1 plug wire clamp.
My light won't flash if this clamp isn't fitted in the correct way.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
PlaysWithCars
post Oct 8 2018, 09:32 PM
Post #6


In a love / hate relationship with my car
**

Group: Members
Posts: 356
Joined: 9-November 03
From: Southeast of Seattle
Member No.: 1,323
Region Association: Pacific Northwest



Yes, as everyone has pointed out, its important that the timing light is connected properly. But, I've frequently found that there is an ignition system issue leading to missed spark. Most common for me has been plug wires: carbon core breaking down or the connection between the wire core and the terminals on the end.

Try putting the light on other plug leads. You won't be able to check the timing, but you should be able to confirm consistent plug firing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DRPHIL914
post Oct 9 2018, 05:38 AM
Post #7


Dr. Phil
****

Group: Members
Posts: 3,348
Joined: 9-December 09
From: Bluffton, SC
Member No.: 11,106
Region Association: South East States



thanks for the tips. i can say that i feel a skip or miss when trying to hold it 3500 rpm for timing, so pretty sure there is a missing spark, just not sure if its a bad wire or if its in the distributor. i can say the cap a rotor were replaced the last time i tried to check this out, and its a new blue coil too. Bosh plugs are probably a year old and less than 1500 miles on them.

will post after changing out plug wires, and will go from there
User is online!Profile CardPM
Go to the top of the page
+Quote Post
TheCabinetmaker
post Oct 9 2018, 09:17 AM
Post #8


I drive my car everyday
*****

Group: Members
Posts: 7,816
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666



Before you go wasting money on plug wires, unscrew the wire from the end. Cut 1/2 inch off the end of the wire, and screw the wire back on.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Oct 9 2018, 07:27 PM
Post #9


that's what I do!
***************

Group: Members
Posts: 17,063
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada



QUOTE(porschetub @ Oct 8 2018, 03:14 PM) *

QUOTE(Mblizzard @ Oct 9 2018, 07:29 AM) *

Also verify that the pick up clip is oriented in the correct direction indicated.

Most usually have an arrow that points toward plug. Hook up backwards and some strange things happen.


My timing light did the same thing and it was a bad contact in the #1 plug wire clamp.
My light won't flash if this clamp isn't fitted in the correct way.


My light I busted the plug wire clamp housing just enough to cause this issue. '
I had to epoxy it back together to get it to work properly again.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jim_hoyland
post Oct 11 2018, 05:41 AM
Post #10


Goldfish - since 1983
*****

Group: Members
Posts: 6,784
Joined: 1-May 03
From: Sunset Beach, CA
Member No.: 643
Region Association: Southern California



and....how did it come out ?
User is online!Profile CardPM
Go to the top of the page
+Quote Post
DRPHIL914
post Oct 12 2018, 07:05 AM
Post #11


Dr. Phil
****

Group: Members
Posts: 3,348
Joined: 9-December 09
From: Bluffton, SC
Member No.: 11,106
Region Association: South East States



QUOTE(jim_hoyland @ Oct 11 2018, 07:41 AM) *

and....how did it come out ?


I have not had time to get back to this, I spent 5 hours cleaning yard and pool yesterday, and then pulled the fuel rail and put in 8 new fuel injectors in our '07 Lincoln navigator(196000 miles). we need to take it on a atrip soon and its been running pretty crappy so I needed to get that done first- success, partly but it looks like I have a transmission solenoid that needs to be replaced. intermittent shifting issue and once and a while a code, then back to .... sorry not Porsche content, but it is my tow vehicle so I need it working!!!! I do hope its that simple and not a full transmission rebuild , but at 200k miles almost its probably due. there are a no service transmission so I was thinking about a full flush and clean and refill first. anyone know if you can just replace the shift solenoid packs on these with out having to pull the whole transmission?? they are not expensive from what i see on line.
Anyway the plug wires were fairly new but i will recheck this and see if its the timing light a plug wire or distributor - the 123ignition one is on the shelf but i wanted to sort that out before installing the new distributor.
User is online!Profile CardPM
Go to the top of the page
+Quote Post

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

 



- Lo-Fi Version Time is now: 16th October 2018 - 12:27 PM