Car never ran better - THEN!, Seems when hot there is no low end power |
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Car never ran better - THEN!, Seems when hot there is no low end power |
ctc911ctc |
Jun 25 2023, 04:30 PM
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#1
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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 |
ctc911ctc |
Jul 1 2023, 03:30 PM
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#2
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Senior Member Group: Members Posts: 893 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
UPDATE
Got under the car today - first I started to sweep the garage, then I decided to clean it, then I was on my knees scrubbing the floor - looks good, however, took 6 hours. FINALLY I got the car in the air and here is what I saw: And the idea is that the heat is cooking the fuel like this....... I took the heater hose off for the picture So, I am planning on moving the pump but I have a few more questions: 1. I have it on the firewall, I do not want to move it up front, remove the gas tank, etc. where should it go, where is it coolest Oh, all the welding was done by my son when he was 17, he is 21 now and is embarrassed when he see these.....I am still very proud of these ugly welds.... (IMG:style_emoticons/default/first.gif) 2. any ideas as to below the engine tin or above? Votes? 3. While the engine is running the pump is on, does the gas cool the pump? should there really be vapor lock? 4. If there is vapor lock, should there be a drop in fuel pressure? Thank you Teeners! |
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