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  #16  
Old 02-24-2009, 06:20 PM
david s poole
 
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all those systems go lean over time and the ball needs to be taken out and move the 3mm fuel adjustment clockwise 1/8th turn.this will be very close.

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  #17  
Old 02-24-2009, 06:47 PM
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But the EHA shows nominal reading and the lambda is just fine, why would I mess with the fuel/air mixture? Do you maybe think that it's internal, which means even if balanced on the outside the engine will stall as if a richer mixture is the cure?
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  #18  
Old 02-24-2009, 06:49 PM
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Quote:
Originally Posted by pawoSD View Post
I would be betting on the air flow potentiometer being worn out.
I have an extra one of these but the existing one showed linear reading without interruption when I moved the air plate and used an Ohmmeter to read the change in resistance. They both did the same thing. (I also have an extra fuel distributor )
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  #19  
Old 02-25-2009, 11:33 AM
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Ok, I just swapped the crank sensor from a working car where I also put my old in the other car. The other car didn't stall but the one in question did. In conclusion the crank sensor didn't resolve this stalling issue.
What's next?
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  #20  
Old 02-25-2009, 08:33 PM
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You don't say you cleaned the idle control valve - that can get sticky around idle position and not respond quickly enough to avoid a stall. Removing it and soaking in alcohol usually works well. Best to pre-purchase the rubber holder and hoses since they harden to fragility over time. Also clean the airflow meter flap and throat to prevent sticking.

Steve
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  #21  
Old 02-26-2009, 09:45 AM
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Quote:
Originally Posted by sbourg View Post
You don't say you cleaned the idle control valve - that can get sticky around idle position and not respond quickly enough to avoid a stall. Removing it and soaking in alcohol usually works well. Best to pre-purchase the rubber holder and hoses since they harden to fragility over time. Also clean the airflow meter flap and throat to prevent sticking.

Steve

The ICV and its hoses are all new. the airflow meter flap is clean and moves nicely.
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  #22  
Old 02-26-2009, 06:31 PM
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Next, then... There is are microswitches on the throttle shaft which signal the ECU to activate the idle circuit or WOT. It has been known to work intermittently (tho it's one thing that I HAVEN'T had to fiddle with on ours). There is also a microswitch on the throttle cable linkage under the air cleaner, and that sometimes does not get compressed when the throttle is released. Don't know if it was on an '88.

Steve
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  #23  
Old 02-26-2009, 09:19 PM
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I have that switch and it tested fine.
The dam car almost killed me this evening. It stalled as I was making a right turn and traffic was coming at me.
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  #24  
Old 02-27-2009, 09:40 AM
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Stall.....

Hi,

Quote:
The dam car almost killed me this evening. It stalled as I was making a right turn and traffic was coming at me.
Sudden Stalling Syndrome (SSS) is a Safety Issue, so be carefull where you go play with the car until you get this issue solved.

I follow this thread since day one, on one of your post you mention duty-cycle 50% EHA +/- 1mA wich is perfect.

My question here, how a car with perfect on/off ratio and perfect EHA reading might stalled???

1- Lost power at the CFI module or at the fuel pump, again thumble all the component behind the battery to try to reproduce your stalling issue at idle.

2- Your Hall Effect Sensor is given bad reading to the CFI module.

3- Your temp. sensor have a bad warming curve.

Since you already swap the coil, the ezl, and the crank sensor, to me this is what left, according to your ON/OFF ratio and EHA reading.

After stalling does the car start right back or do you have to wait ?

Do you have to floor the throttle to get it running after she stall ?

When it start back does the RPM surge from 500 to 1500 RPM ?

Hope this Help

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  #25  
Old 02-27-2009, 10:59 AM
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Thanks Max,
when the car starts first thing before I go to work it goes to about 900 rpm, NEVER above 1000 rpm. If I sit in the car waiting for it to warm up it will sometimes stall. It will immediately start back but sometimes I have to hold the throttle or it will stall back.
I went ahead this morning and lightly hit all relays and the computer while the car was at idle and that didn't produce a stall.
Let me repeat an observation: When I push on the throttle (give more gas) while the car is in idle it will backfire.
Oh, the temp sensor wouldn't be the problem because my old one and the new one never cured the stall (statistically speaking).
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  #26  
Old 02-27-2009, 07:17 PM
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I just finished doing some adjustments, so before I knocked the tower ball out to reach the fuel/air mixture I remeasured the fuel pressure and monitored the duty cycle.








I then drilled the ball out and adjusted the fuel mixture a tad richer but that didn't influence the idle at all. What's up with that? I did see the duty cycle change to the rich side but that's about it.
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  #27  
Old 02-27-2009, 07:52 PM
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Anyone???????????????
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  #28  
Old 02-27-2009, 09:58 PM
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your thinking way past this....just tune the damn thing up and see if that works...hall effect sensors and such...come on...Sudden Stalling Syndrome? Please, that is foolish talk, just put some simple parts on the damn thing and start there, this isn't a Space Shuttle you are talking about...What is the Hall Effect? Tell me that....
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  #29  
Old 02-27-2009, 11:09 PM
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Quote:
Originally Posted by cliffmac View Post
your thinking way past this....just tune the damn thing up and see if that works...hall effect sensors and such...come on...Sudden Stalling Syndrome? Please, that is foolish talk, just put some simple parts on the damn thing and start there, this isn't a Space Shuttle you are talking about...What is the Hall Effect? Tell me that....
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  #30  
Old 02-28-2009, 10:24 AM
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Quote:
Originally Posted by cliffmac View Post
your thinking way past this....just tune the damn thing up and see if that works...hall effect sensors and such...come on...Sudden Stalling Syndrome? Please, that is foolish talk, just put some simple parts on the damn thing and start there, this isn't a Space Shuttle you are talking about...What is the Hall Effect? Tell me that....
Didn't I started this thread with comment: only if you know what you're talking about? If you have a solution or a positive suggestion then please, by all means, do share. Oh, I happen to be a space cadet

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