Needs some help - 71 stock 914, starts and runs great for 30 minutes - then fails... |
|
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. |
|
Needs some help - 71 stock 914, starts and runs great for 30 minutes - then fails... |
potomacmidget |
Aug 25 2018, 02:45 PM
Post
#1
|
I gotta have more cowbell.... Group: Members Posts: 161 Joined: 27-March 11 From: Maryland Member No.: 12,860 Region Association: North East States |
Dear All,
I have a 1971, 1.7L 914, D-jet, original/stock with exception of the muffler system. Purchased from a fellow board member here, very well sorted car - has been solid for like 5 years. As of a month ago it starts fine, then after 30 minutes runs rough, backfires and then stalls. Has happened twice, managed to get home by keeping the engine rev'd at 2K RPM and then popping it in gear and keeping it in 3rd reving high, with backfires. Once it stalls very difficult to get it to start again. Both times it has been hot out, have not experienced this before, fuel pump is in the original position and perhaps vapor lock? (but never happened in the past). Prior to the issues I pulled distributor, replaced the points, condenser, cap rotor, and reinstalled. I exercised caution pulling it an ensured I lined it up properly. I "did" adjust the timing post distributor installation (had to find the faded spots and repaint them) and I adjusted the throttle at the screw by the throttle body. System idled great at like 750 RPM and ran fine - but then the stalling problem previously described started. I am thinking of the following could be issues: ignition parts? new but a bad component maybe? timing messed up? but not sure how it would drift as it starts fine fuel pressure regulator issue? CHT issue? bad coil? acts up once hot? bad fuel? bad relay board or D-jet pressure sensor? bad fuel filter? Any help appreciated. After the first failure I found I had a leaking fuel injector, leaking from the injector itself(crack). I replaced the injector and it fired up fine, but then 30 minutes later it sort of goes demonic on me...so that was not the root cause. Thanks in advance, Reg |
Racer |
Aug 28 2018, 06:25 AM
Post
#2
|
Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
On the plus side, while the board has diagnosed it as either a fuel issue or a spark (ignition) issue.. we all agree its getting plenty of the 3rd needed element. . . Air!
|
Lo-Fi Version | Time is now: 27th September 2024 - 01:20 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |