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 29 2023, 07:50 PM
Post
#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***********
Turns out to be Dwell Angle. I took apart the Distributor a few weeks ago to again look for stuck plates. I put it back, set the points to .4mm and must not have measured the dwell. I measured it and it was at high 50's. I then chased it into the 30's halfed the gap and stuck a perfect 46. I then reset the timing, good thing I painted a nice WHITE arrow on the fly wheel when I had the engine out! the arrow lined right up into the gap.....wow.....getting lucky! Tightened up the engine bay, removed the dwell meter, etc. Also, put back that screw cap for flywheel access.......did the engineers really understand what mechanics would have to go through with that one????? Just as I was about to leave the house, my daughter came running out for a ride in the "little car" - made my day. from the time I left the driveway, the car felt new. strong. Out of the hole it pulled hard, no missing at all, no bucking or rough spots.....finely tuned automobile. Thank you to George Hussy for being so fussy about Dwell, and also to Richard Towle who in this thread and in the messages was very supportive and had great ideas - he is truly a Zen Master. Last, Captn Krusty whom I understand has passed, left us with some great guidance all of which culminated in this car being DONE. From it coming out of a garage in RI where it sat since '84 to my garage in '17, long road. Taught my son to weld (IMG:style_emoticons/default/welder.gif) , gas systems, electric, etc...... and taught both of us patience. Thank you Teeners! (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/driving-girl.gif) (IMG:style_emoticons/default/pray.gif) '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 |
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