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Just strait up can't figure it out. $50 reward offered.


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1 hour ago, flagoworld said:

 

Clutch in, wait for it to drop to idle, then hit brakes? Or hit brakes as the RPM comes down to idle? I guess what I am wondering is, is the braking directly responsible for the idle failing, or is it a combination of the braking and  the transition period where the ECM is switching to idle mode.

Ok I understand

 

1) Foot off throttle. 

2) Clutch in about 2500-3000, idle drop, sometimes overrun, sometimes not.

3) Normal to aggressive on the brakes (the less aggressive, the less the idle drop)  

4) The idle drops coinciding with the car coming to a complete stop and rocking back. 

 

Fuel slosh? But the problem is that fuel pressure doesn't drop.  Maybe fuel slosh in the manifold? The bottom of the manifold is wet after a normal drive. 

 

 

 

 

Edited by Dudeland

"Goosed" 1975 BMW 2002

 

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So if you clutch in and coast until the car is fully idling, and then brake, is it the same problem once you hit the brakes?

 

I interpreted that as a yes but we describe very different haha.

Edited by flagoworld

'74 Verona

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Ok I know it’s stupid, but have you looked at the fuel pickup in the gas tank? I know it’s a crazy long shot, but everyone else is looking at the front of the car, why not look at the complete fuel system. It might even be fun!

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9 minutes ago, golf02 said:

Ok I know it’s stupid, but have you looked at the fuel pickup in the gas tank? I know it’s a crazy long shot, but everyone else is looking at the front of the car, why not look at the complete fuel system. It might even be fun!

 

If i remember, that was asked and fuel pressure was normal during the whole event.

'74 Verona

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4 hours ago, flagoworld said:
So if you clutch in and coast until the car is fully idling, and then brake, is it the same problem once you hit the brakes?
 
I interpreted that as a yes but we describe very different haha.


If the car is completely stopped, then step on the brakes nothing happens. It seems like the front and back rocking is causing the issue. It has to be the fuel, the only part between the tank and the motor is the fuel filter. The gas is the only part that is moving.


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Edited by Dudeland
grammer

"Goosed" 1975 BMW 2002

 

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I had a fuel pickup on an old car , that was rusted and moved around like a loose tooth in a child’s mouth. That was super fun to diagnose.

I will take it out and take a look at it again. The nice part of having the canister filter is it acts a little bit like a surge tank in case the pickup sees a little air.




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"Goosed" 1975 BMW 2002

 

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Just think about all the stuff   WE  are learning!

We sure do appreciate all you are doing for all of us Dudeland. I understand it's hard being front runner, but when it's all worked out (or not) WE will ALL be richer for this. Wish I had the brains to help you, but we're all here for you.

Much respect!

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1976 02 in Granatrot Met. m42, 5sp. - Greta

 

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Just think about all the stuff   WE  are learning!

We sure do appreciate all you are doing for all of us Dudeland. I understand it's hard being front runner, but when it's all worked out (or not) WE will ALL be richer for this. Wish I had the brains to help you, but we're all here for you.
Much respect!

Thanks, that means more than you know.



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"Goosed" 1975 BMW 2002

 

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Here's an idea to maybe isolate the variables a little further.  If you haven't done this already, try some things like:

 - Hard stop from very low speed, where the RPM doesn't have far to fall, but you still get a good jerk coming to a stop.

 - Light stop from high speed, where the RPM DOES come down a long way, but with very little braking jerk.

 - Higher speed, shift to neutral and let the revs drop to idle, and THEN a hard stop.

 - Higher speed, but leave it in gear with the clutch engaged, hard stop, but don't push the clutch out until the last possible moment.

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15 pages, 222 replies, 7760 views ... it may be time to to raise the reward to $100 ! i ! i !   ;) 

 

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  • Haha 1

     DISCLAIMER 

I now disagree with some of the timing advice I have given in the past.  I misinterpreted the distributor curves in the Blue Book. 

I've switched from using ported-vacuum to manifold, with better results. 

I apologize for spreading misinformation.  

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