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Re: Getting angry with car stalling


keydiver
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Galant VR-4 org Post #: 845654 posted 11/02/09 10:02 AM     Remind Me!  Send Private Message   Edit Post      
I would try resetting the code and see if it comes back. It may have been a one-time fluke.
If your fueltrims are all at 139, that means you are 10% too lean. Have you checked your base fuel pressure lately?

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deez
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Galant VR-4 org Post #: 845670 posted 11/02/09 10:41 AM     Remind Me!  Send Private Message   Edit Post      
Base fuel pressure is 37 psi



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keydiver
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Galant VR-4 org Post #: 845813 posted 11/02/09 05:49 PM     Remind Me!  Send Private Message   Edit Post      
Do you know the part number on the injector? What color are they? As I said, you are missing a TON of fuel somewhere to have fueltrims at 139%.
Your Global Fuel is set for 724cc @ the stock 37psi base fuel pressure. I would try raising the fuel pressure a few psi, the gauge is probably off. Underhood gauges are VERY unreliable, especially if you try to read them when hot.

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deez
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Galant VR-4 org Post #: 845852 posted 11/02/09 07:47 PM     Remind Me!  Send Private Message   Edit Post      
supposedly the are Denso 720's. I raised the pressure to 39psi and reset the computer to get rid of the code 22. It still lean as hell at idle especially, at 160ish on the ft02. I added from 3% to 9% on the safc, and it had no affect on the numbers which I though was odd.



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Smitty1457
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Galant VR-4 org Post #: 845857 posted 11/02/09 08:01 PM     Remind Me!  Send Private Message   Edit Post      
It may take some time for you to see the trims start to change on the logger.

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keydiver
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Galant VR-4 org Post #: 845969 posted 11/03/09 09:28 AM     Remind Me!  Send Private Message   Edit Post      
Quoting deez:

supposedly the are Denso 720's.



What color are they? Can you read any numbers off the tops of them? As lean as you are, I'm thinking you may need more like 43psi to get the HIGH TRIM to 100.

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deez
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Galant VR-4 org Post #: 845978 posted 11/03/09 09:45 AM     Remind Me!  Send Private Message   Edit Post      
5500-0830 and the tops are light blue. At least thats what I think I read



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keydiver
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Galant VR-4 org Post #: 846050 posted 11/03/09 12:33 PM     Remind Me!  Send Private Message   Edit Post      
Yep, 195500-0830 is a Denso 720cc, so you are OK there. I have to assume your pressure gauge is way off. As I said, try 43psi.

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deez
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Galant VR-4 org Post #: 846075 posted 11/03/09 01:42 PM     Remind Me!  Send Private Message   Edit Post      
the gauge is a marshall liquid filled, but I will give that a try. What I don't understand is with the current settings, trims were dialed. How could they change so drastically?



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KGVR4
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Galant VR-4 org Post #: 846100 posted 11/03/09 02:41 PM     Remind Me!  Send Private Message   Edit Post      
I think my galant has the exact same symptoms.

Deez: Do your dash lights, interior lights, headlights flicker/get dim at all? Mine seems to have some of the symptoms your car is having but my lights flicker/get dim also.



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Galant VR-4 org Post #: 846101 posted 11/03/09 02:44 PM     Remind Me!  Send Private Message   Edit Post      
Do you have an underdrive pulley?



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deez
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Galant VR-4 org Post #: 846104 posted 11/03/09 02:47 PM     Remind Me!  Send Private Message   Edit Post      
I took a bunch of readings now that my logger works Maybe someone can tell me if they mean anything.

ISC reading varies from 13-15, VSPD is bouncing around which I don't know what its supposed to do when sitting still, voltage at idle is 13.9-14.0, O2-R is bouncing from .05V to .82V and everywhere in between, TPS at idle is 10.5%, vacuum at idle is about 13" (keep in mind cams), voltage at idle with ac on is 13.7 and with lights also 12.9v, and car just dies when revved with ac and/or lights on at stop. And now I am looking at the VSPD with the car off but acc. on and its still bouncing around, which seems odd. And the pulley is stock.



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KGVR4
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Galant VR-4 org Post #: 846107 posted 11/03/09 02:57 PM     Remind Me!  Send Private Message   Edit Post      
Do your lights flicker/get dim?



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deez
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Galant VR-4 org Post #: 846110 posted 11/03/09 03:06 PM     Remind Me!  Send Private Message   Edit Post      
no they dont



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keydiver
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Galant VR-4 org Post #: 846187 posted 11/03/09 08:40 PM     Remind Me!  Send Private Message   Edit Post      
VSPD doesn't work on our cars. The only way to see what the speed sensor is doing is to add address C6 to an open logger address, if you have a version of MMcD that allows that.
Everything else sounds fine, I have no idea why your tune has changed. Liquid filled gauges DO change greatly with temperature. Just ignore the reading, and tune the AFPR to get a HIGH TRIM of 100.

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deez
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Galant VR-4 org Post #: 846191 posted 11/03/09 08:56 PM     Remind Me!  Send Private Message   Edit Post      
Thanks Jeff. Here's a question....if I added fuel at idle to get it from the 160 range from 3% to 9% and saw no change, doesn't that seem like something is wrong?
Before I zero out the safc and dial in the trims, I would like to address why the car stalls with the accessories such as lights and ac on more so than without. That seems like a variable unrelated to trims. It doesn't even try to catch itself sometimes, yet sometimes it catches itself. That seems like something else. And the code 22 for the CAS has not reappeared after two days of driving, so I guess that was a fluke.



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keydiver
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Galant VR-4 org Post #: 846312 posted 11/04/09 09:33 AM     Remind Me!  Send Private Message   Edit Post      
Quote:

if I added fuel at idle to get it from the 160 range from 3% to 9% and saw no change, doesn't that seem like something is wrong?



If you are REALLY lean at idle, like 20% too lean, an increase of 3-9% still isn't going to get the LOW TRIM to move from 139. I still say you need to raise the base fuel pressure to get the trims right first. Your extreme leanness is just going to aggravate the stalling issue.

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deez
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Galant VR-4 org Post #: 846340 posted 11/04/09 10:50 AM     Remind Me!  Send Private Message   Edit Post      
To me this sounds like a vacuum leak, although I can't find one. Extreme lean condition at idle/low rpm, when there is the most vacuum, makes sense. And also when coming to a stop the car is pulling a ton of vacuum, which could make the car stall as well. Sound right? I don't see how the car can be 20% lean at idle, and out of nowhere. It doesn't make sense. But who said Mitsubishi's make sense



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keydiver
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Galant VR-4 org Post #: 846646 posted 11/04/09 10:16 PM     Remind Me!  Send Private Message   Edit Post      
Perhaps, but it would have to be a HUGE leak to also get the HIGH TRIM to 139, IMO.

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deez
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Galant VR-4 org Post #: 846777 posted 11/05/09 10:32 AM     Remind Me!  Send Private Message   Edit Post      
The weekend I will bump it up to 43 and zero out the safc and see what happens.



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Galant VR-4 org Post #: 848874 posted 11/11/09 11:33 AM     Remind Me!  Send Private Message   Edit Post      
Great thread. I never realized it because I hadn't been paying attention but my car is barely showing over 13v at idle or even at 5000rpm once warmed up. May be why it's been stalling when hot I have a spare DSM alternator I could try swapping in but I'm not sure it's worthwhile to put in a 75amp unit.



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Galant VR-4 org Post #: 849065 posted 11/12/09 07:37 AM     Remind Me!  Send Private Message   Edit Post      
Changed my alternator yesterday afternoon, doesn't seem to make any difference. I see a hair over 14v when the car first starts, idles and revs. Once it warms up it starts to drop below 14 then the car starts to sputter when returning to idle from revving. I'm going to clean up all the battery terminals and see if that makes any difference and if not, get my battery tested.



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Galant VR-4 org Post #: 849068 posted 11/12/09 07:53 AM     Remind Me!  Send Private Message   Edit Post      
Do you have heatshields on the exhaust/downpipe?

Original equipment mitsubishi alternators have a very aggressive thermal compensation curve. They will taper their charging voltage significantly if they are getting toasty...



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deez
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Galant VR-4 org Post #: 857206 posted 12/11/09 11:12 AM     Remind Me!  Send Private Message   Edit Post      
Today I tried putting the stock MAS and appropriate chip in the ecu and it made the issue worse. Idle is now searching around when sitting still, stumbling/stalling is the same. Strange that putting the car back to stock in that regard made it worse. Anyone want a car?



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deez
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Galant VR-4 org Post #: 857207 posted 12/11/09 11:15 AM     Remind Me!  Send Private Message   Edit Post   
I forgot, I did bump up the fuel pressure to 43psi, and it helped the trims but not the stalling. Now I think I need to bump it back down because with the stock MAS and the safc zero'ed out, its pig rich at idle, reading 38 on the logger. And from what I recall, with this setup before I added the 3G mas, the safc was pulling a touch of fuel out at idle , but not much. I'm wondering if the pig rich condition is a hint at the real underlying issue.



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