Car never ran better - THEN!, Seems when hot there is no low end power |
|
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. |
|
Car never ran better - THEN!, Seems when hot there is no low end power |
ctc911ctc |
Jun 25 2023, 04:30 PM
Post
#1
|
Senior Member Group: Members Posts: 893 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
'74 2.0 - 25K miles
It has been a very long journey. I, with my 17yr old son who is now 21, rebuilt nearly every system including the Engine and Transmission (a nod to Dr. Evil !! ). My son and I have learned a great deal, however, this one has me stumped. The car runs terrific and is strong, smooth and a joy to drive, today I took it around the Lakes here in Arlington MA and at the end of the drive there is a hill with a red light - I caught the red. I waited as the button pushers jaywalked (after they hit the button) and then I waited some more with the crosswalk signs blinking and no one crossing.....sigh OK, there is the green and I ease out the clutch and apply a little gas AND nothing...... nearly idling. I then bury the gas and the car stalls.......and since this is New England everyone starts beeping and yelling - so I get the flashers on and people go around me. I wait another light cycle and get the cars started by pumping the gas and keeping it running over 1500, once it started moving it ran fine. It is almost as if there was zero power below 1500, though when the car was rolling everything worked as you would expect. When the car is cold the low power is as normal as a 90HP engine can be. The temp of the car is about 2/3rds deflection of the center console temp gauge. I am thinking all sorts of complicated thoughts.......head temp sensor is sending weird signals to the Bosch controller OR when super hot the vacuum system starts leaking, etc. So, I thought I would start here - any ideas teeners???? Keep me sane and guide me to the light! CTC911CTC |
emerygt350 |
Jul 1 2023, 09:46 PM
Post
#2
|
Advanced Member Group: Members Posts: 2,131 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
You are fine there. Not an original position or pump but if you still think it's vapor lock, I don't, you can put insulation all over that and find out before you move any of it.
And it isn't the pump that will be cooking, it will be the lines. |
ctc911ctc |
Jul 2 2023, 08:24 AM
Post
#3
|
Senior Member Group: Members Posts: 893 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
Same day I had the trouble with the 914, my neighbor had the same thing - exact same circumstances - happen to his Model A........so I am leaning towards vapor lock
I also was thinking of putting in a heat barrier, perhaps something blocking the airflow from the engine......... THANK YOU very much for your interest in this matter - I am trying to get this old but nearly new (25k miles) back to a reliable fun car, almost there! You are fine there. Not an original position or pump but if you still think it's vapor lock, I don't, you can put insulation all over that and find out before you move any of it. And it isn't the pump that will be cooking, it will be the lines. |
Lo-Fi Version | Time is now: 1st June 2024 - 12:16 AM |
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 ... |