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 |
emerygt350 |
Jul 6 2023, 11:39 AM
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#2
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Advanced Member Group: Members Posts: 2,136 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I don't suggest wrapping it, just create a barrier for trouble shooting. His symptoms don't really match vapor lock in my opinion so I am staying out of it.
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914_teener |
Jul 6 2023, 11:48 AM
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#3
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914 Guru Group: Members Posts: 5,205 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
I don't suggest wrapping it, just create a barrier for trouble shooting. His symptoms don't really match vapor lock in my opinion so I am staying out of it. The picture showing the fuel pump the OP posted shows it that way. I didn't post that you stated to wrap it and most likely it isn't vapor lock in my opinion. |
emerygt350 |
Jul 6 2023, 01:44 PM
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#4
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Advanced Member Group: Members Posts: 2,136 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I don't suggest wrapping it, just create a barrier for trouble shooting. His symptoms don't really match vapor lock in my opinion so I am staying out of it. The picture showing the fuel pump the OP posted shows it that way. I didn't post that you stated to wrap it and most likely it isn't vapor lock in my opinion. I see that now. I bet that was for noise insulation. |
914_teener |
Jul 6 2023, 04:19 PM
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#5
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914 Guru Group: Members Posts: 5,205 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
I don't suggest wrapping it, just create a barrier for trouble shooting. His symptoms don't really match vapor lock in my opinion so I am staying out of it. The picture showing the fuel pump the OP posted shows it that way. I didn't post that you stated to wrap it and most likely it isn't vapor lock in my opinion. I see that now. I bet that was for noise insulation. What I did....couldn't find my old thread...maybe that is because now I really am old; I installed some Rivnuts in the firewall but higher than the up and above the "cooling" flaps. Then I installed the stock isolators which stand off from the firewall surface allowing full airflow around the pump. Worked like a charm. I never liked the idea of putting the pump underneath the rack pan for a lot of reasons. The picuture of that pump looks something like the DAPO stuff I see posted. Tie wraps holding on a cheap peice of refrigeration inslulation ready made for a kindling fire. Not advisable. At least the right fuelline clamps were used. |
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