 Cylinders 3 and 4 are dead, why? |
|
|
|
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. |
|
|
| Skid |
 May 8 2010, 06:27 PM
Post
#1
|
|
Just a fool, a fool in love  Group: Members Posts: 68 Joined: 1-February 05 From: Chattanooga, TN Member No.: 3,538 Region Association: None  |
I just brought home a 73 1.7. This is the first 914 that I have actually owned, but not the first one that I have driven. My dad has always had a few 914's around and I finally decided it was time to get one of my own. When I first picked up the car, it ran pretty good and smooth. The original fuel injection has been removed and replaced with some duel single barrel weber carburetors and it has a 009 distributor. Like I said, the car ran pretty good when I first got it about 2 weeks ago. For the past 2 weeks I haven't driven the car more than just around the block, and suddenly, out of the blue, I went to go move the car and it is running bad. It has a definite misfire and, when I pull the plug wires off the distributor cap, 3 and 4 seem not to be firing. I have checked compression in those two cylinders and they are fine. I am getting fuel (I can see that the carb is squirting gas), and I have also tested to see that I was getting spark on those two cylinders. If I have spark, fuel, and compression, what am I missing? How could it just change overnight? I am pretty stumped here, my dad, who has worked on these things for over 20 years is also pretty stumped. Any ideas or help would be very appreciated.
(IMG:http://www.914world.com/bbs2/uploads_offsite/lh5.ggpht.com-3538-1273364830.1.JPG) (IMG:http://www.914world.com/bbs2/uploads_offsite/lh4.ggpht.com-3538-1273364831.2.JPG) And the mess of an engine bay..... (IMG:style_emoticons/default/barf.gif) (IMG:http://www.914world.com/bbs2/uploads_offsite/lh6.ggpht.com-3538-1273364831.3.JPG) Thanks, Chase Birks |
   |
 
|
  |
Replies
| JamesM |
May 10 2010, 01:07 AM
Post
#2
|
|
Advanced Member Group: Members Posts: 2,100 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
Hurry up and get that thing running, you have a PCA autocross to get to this sunday! We need more 914s there.
Let me know if you need a hand... or parts. My house is starting to look like a 914 wrecking yard. (IMG:style_emoticons/default/smile.gif) |
|
|
|
| Skid |
May 10 2010, 10:53 AM
Post
#3
|
|
Just a fool, a fool in love Group: Members Posts: 68 Joined: 1-February 05 From: Chattanooga, TN Member No.: 3,538 Region Association: None |
Ok! I figured it out! Boy do I feel stupid. I worked on the car for hours on saturday. I changed plug wires, plugs, rebuilt the carb, adjusted the timing, and a few other things, and nothing helped one bit. I was playing with the timing when the car backfired and my dad noticed that flame came out from the manifold on the dead side. He reached down and stuck his finger over the hole, which was just out of view, and just like that, the car sprang back to life and ran just like before. I guess some little plug that had been there before must have fallen out and caused a vacuum leak. So for those of you who guessed vacuum leak, you win the prize! Thanks for your help and info. I am sure I will be needing lots more of it as I get this little guy back on the road. Next step, emission and inspection, wish me luck.
|
|
|
|
| 70_914 |
May 10 2010, 11:38 AM
Post
#4
|
|
Member Group: Members Posts: 395 Joined: 4-December 09 From: Roy, WA Member No.: 11,096 Region Association: Pacific Northwest |
QUOTE(Skid @ May 10 2010, 09:53 AM)  Ok! I figured it out! Boy do I feel stupid. I worked on the car for hours on saturday. I changed plug wires, plugs, rebuilt the carb, adjusted the timing, and a few other things, and nothing helped one bit. I was playing with the timing when the car backfired and my dad noticed that flame came out from the manifold on the dead side. He reached down and stuck his finger over the hole, which was just out of view, and just like that, the car sprang back to life and ran just like before. I guess some little plug that had been there before must have fallen out and caused a vacuum leak. So for those of you who guessed vacuum leak, you win the prize! Thanks for your help and info. I am sure I will be needing lots more of it as I get this little guy back on the road. Next step, emission and inspection, wish me luck. I guess all that time and money I spent going to school to become an automotive technician paid off... (IMG:style_emoticons/default/smilie_pokal.gif) Glad you got it running right! |
|
|
|
| Skid |
May 10 2010, 12:29 PM
Post
#5
|
|
Just a fool, a fool in love Group: Members Posts: 68 Joined: 1-February 05 From: Chattanooga, TN Member No.: 3,538 Region Association: None |
QUOTE(70_914 @ May 10 2010, 09:38 AM) QUOTE(Skid @ May 10 2010, 09:53 AM) Ok! I figured it out! Boy do I feel stupid. I worked on the car for hours on saturday. I changed plug wires, plugs, rebuilt the carb, adjusted the timing, and a few other things, and nothing helped one bit. I was playing with the timing when the car backfired and my dad noticed that flame came out from the manifold on the dead side. He reached down and stuck his finger over the hole, which was just out of view, and just like that, the car sprang back to life and ran just like before. I guess some little plug that had been there before must have fallen out and caused a vacuum leak. So for those of you who guessed vacuum leak, you win the prize! Thanks for your help and info. I am sure I will be needing lots more of it as I get this little guy back on the road. Next step, emission and inspection, wish me luck. I guess all that time and money I spent going to school to become an automotive technician paid off... (IMG:style_emoticons/default/smilie_pokal.gif) Glad you got it running right! Yeah, I guess, that would help. Thanks again. |
|
|
|
Posts in this topic
Skid Cylinders 3 and 4 are dead, why? May 8 2010, 06:27 PM
Tom Check # 3 and # 4 plugs.
Could be fouled a... May 8 2010, 06:46 PM 70_914 Do you have one of the dual carb tuning tools? Ge... May 8 2010, 06:50 PM
Skid I have changed all of the plugs, so I don't th... May 8 2010, 06:59 PM McMark I would rebuild those carbs before I mess with any... May 8 2010, 07:39 PM Vacca Rabite :agree:
Lots of little passages that could be plu... May 8 2010, 07:50 PM kwales My bet is ignition problems.
With a single carb, ... May 9 2010, 08:22 AM McMark But it's not a single carb. It's dual car... May 9 2010, 09:28 AM kwales OK, OK, I read duel single barrel and brain stoppe... May 9 2010, 12:37 PM Skid Oh, and James, I will sure try to make it to that ... May 10 2010, 10:56 AM JamesM Yup, i recognize those cars! I was wondering w... May 10 2010, 07:52 PM Skid Ok, so I lied apparently. 3 and 4 are now running ... May 10 2010, 07:36 PM Root_Werks So your Dad got to drive the steel top then? :dri... May 10 2010, 11:16 AM Skid
So your Dad got to drive the steel top then? :dr... May 10 2010, 12:25 PM JamesM
So your Dad got to drive the steel top then? :d... May 10 2010, 08:14 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 11th July 2025 - 05:08 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.