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Car dies but starts right back up.


1990GSXNA
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Galant VR-4 org Post #: 1209951 posted 06/11/15 09:37 PM     Remind Me!  Send Private Message   Edit Post      
My GGSX will start normally and run for up to 10 seconds and then it will shut off, kind of like if I were to turn the key off. The engine DOESN'T sputter shake or anything it just shuts off. When it dies the three dash lights come on (check engine, brake, oil light) because the car is still in the "on" position. My first instinct is alternator or fuel pump, but the symptoms of those going out would have the engine shake and stutter before dying. Then also the car wouldn't start right back up if the alternator was shot.
I can start the car right away after it dies but it will die instantly after. I can also put the car in gear and run it but as soon as I'm off the gas it will die. If I hold the throttle almost wide open it will not die, but under low throttle it will still die.

After some research I have a feeling that the IAC has gave out on me because the idle would be very sporadic, before the dying issue started. While it was in its warm up cycle it would rev to about 2000 then drop to around 1500 then drop and repeat over and over until the car was at operating temperature then the idle would be fine and smooth at around 1000. It's just I have no idea how a car reacts to having the IAC go out, and that's where my questions start.

What is wrong with my car?
Where do I even start to diagnose this problem?
How does a car react to the IAC going bad?

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

92_talon_awd
Member +
29/1000


Galant VR-4 org Post #: 1209952 posted 06/11/15 09:51 PM     Remind Me!  Send Private Message   Edit Post      
IAC Test. click



1992 VR4 29/1000 - Stock/Garage Dweller
2012 Jeep Grand Cherokee Overland Summit
2009 Harley Davidson Road Glide
2001 Toyota Tacoma TRD 4x4 - 405k miles
2005 Infinity G35 Coupe
2004 Chevrolet Express 3500 - 445k miles

Posts: 456 | From: Knoxville, TN | Member Since: 02/11/14 | IP: (50.252.79.53) | Report this post to a Moderator

transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1209985 posted 06/12/15 07:41 AM     Remind Me!  Send Private Message   Edit Post      
check your CAS sound like its shorting out once it see any heat.



138/2000
152/1000

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1990GSXNA
Newbie


Galant VR-4 org Post #: 1210057 posted 06/13/15 12:24 AM     Remind Me!  Send Private Message   Edit Post      
I followed the steps in that video and my IAC is showing that it is reading no resistance between the 1-2 pins and also the 4-5 pins. With what he said on the video that means the IAC is bad, do you think mine is as well?



1990 Mitsubishi Galant GSX
"Gina the Galant"

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

idreamidrive
Member +
394/1000


Galant VR-4 org Post #: 1210088 posted 06/13/15 12:20 PM     Remind Me!  Send Private Message   Edit Post      
Yes, it is bad. Also check your ecu now too.


Edited by idreamidrive (06/13/15 12:21 PM)

Posts: 427 | From: Murray, KY | Member Since: 10/10/12 | IP: (107.167.107.115) | Report this post to a Moderator

1990GSXNA
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Galant VR-4 org Post #: 1210181 posted 06/14/15 06:39 PM     Remind Me!  Send Private Message   Edit Post      




So I took out my ECU and as you can see the caps have started leaking. Now this could be causing my issue. But could there still be an underlying cause?

How legit is ECMTuning? That's what I have seen on here that most people send their ECUs to get fixed.

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

dsm1990tsi
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Galant VR-4 org Post #: 1210184 posted 06/14/15 08:40 PM     Remind Me!  Send Private Message   Edit Post      
Ecmtuning are good people, I had my ecu socket and caps replaced. Great service.

Posts: 17 | From: Pottstown, Pa | Member Since: 08/09/08 | IP: (66.87.81.32) | Report this post to a Moderator

1990GSXNA
Newbie


Galant VR-4 org Post #: 1211152 posted 06/29/15 07:33 PM     Remind Me!  Send Private Message   Edit Post      
Sent my ECU to ECMTuning, and I am getting the capacitors replaced. They said my ECU is fine other than the leaking capacitors, also the the ISC drivers are working properly as well as the fuel pump relay. Thus ruling out the ECU being the culprit of the car not running. Any other suggestions?



1990 Mitsubishi Galant GSX
"Gina the Galant"

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

92_talon_awd
Member +
29/1000


Galant VR-4 org Post #: 1211180 posted 06/30/15 12:01 AM     Remind Me!  Send Private Message   Edit Post      
I sent my GGSX ECU to Thomas and he hooked it up proper. Car runs great now. Have you replaced your IAC with a known good one?



1992 VR4 29/1000 - Stock/Garage Dweller
2012 Jeep Grand Cherokee Overland Summit
2009 Harley Davidson Road Glide
2001 Toyota Tacoma TRD 4x4 - 405k miles
2005 Infinity G35 Coupe
2004 Chevrolet Express 3500 - 445k miles

Posts: 456 | From: Knoxville, TN | Member Since: 02/11/14 | IP: (2601:843:c101:27) | Report this post to a Moderator

1990GSXNA
Newbie


Galant VR-4 org Post #: 1211190 posted 06/30/15 08:31 AM     Remind Me!  Send Private Message   Edit Post      
I'm hoping when I get the ECU back it'll run great again, but I'm doubtful. Assuming the IAC from oreilys was good, then yes I replaced it with a good one. What was wrong with your ECU and what did he do to fix it?

Could it be the CAS, someone posted about the earlier but I kinda wrote it off because my car would run once it was setting in the Arizona heat for a while.



1990 Mitsubishi Galant GSX
"Gina the Galant"

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

92_talon_awd
Member +
29/1000


Galant VR-4 org Post #: 1211192 posted 06/30/15 08:48 AM     Remind Me!  Send Private Message   Edit Post      
He put new caps on it, had to replace the isc drivers and a few other things. I think it was pretty messed up because they ended up drilling a hole through the board and running a wire from the front side to the back. But it works great now. Before he rebuilt it the car would idle all over the place, it wouldn't idle surge but it would always idle at a different rpm. I sent him a buddy's ecu for a vr4 that was cooked. His cars fuel pump would randomly cut off and it was the ecu.



1992 VR4 29/1000 - Stock/Garage Dweller
2012 Jeep Grand Cherokee Overland Summit
2009 Harley Davidson Road Glide
2001 Toyota Tacoma TRD 4x4 - 405k miles
2005 Infinity G35 Coupe
2004 Chevrolet Express 3500 - 445k miles

Posts: 456 | From: Knoxville, TN | Member Since: 02/11/14 | IP: (2601:843:c101:27) | Report this post to a Moderator

1990GSXNA
Newbie


Galant VR-4 org Post #: 1211417 posted 07/04/15 12:05 AM     Remind Me!  Send Private Message   Edit Post      
I got my ECU back an plugged it back in, car starts right up and staying running. But it still has the sporadic idle, I already replaced the known bad ISC with no symptom changes. Any other ideas comments or suggestions?

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.0.173.243) | Report this post to a Moderator

1990GSXNA
Newbie


Galant VR-4 org Post #: 1212574 posted 07/17/15 12:05 AM     Remind Me!  Send Private Message   Edit Post      
Got my car running and it turned out the be to FIAV was not working properly so I blocked it from working and now my car runs great again! Living in AZ means I don't really have to deal with cold strt issues commonly attributed to the FIAV bypass.



1990 Mitsubishi Galant GSX
"Gina the Galant"

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (68.2.109.167) | Report this post to a Moderator

1990GSXNA
Newbie


Galant VR-4 org Post #: 1214981 posted 08/20/15 04:34 PM     Remind Me!  Send Private Message   Edit Post      
So my car has started doing this again, same symptoms are before. The car will start no problems and run great for 3-5 seconds until it will stall. If I give it gas it will still stall out. Iím at a loss here and any help would be greatly appreciated. Here is a list of things that I have done in the past 1-2 months to fix this and as routine maintenance:
New ISC
New CAS
New Fuel Filter
New Plugs/wires
New O2 sensor
Timing belt (all other belts/pulleys water pump that go along with it.)
Ebay Header
New battery
ECU capacitors replaced at ECMTuning
FIAV bypass
TPS tested good
ECT sensor tested good

What should I test next? I'm at a total loss thanks in advance!



1990 Mitsubishi Galant GSX
"Gina the Galant"

Posts: 24 | From: Glendale, AZ | Member Since: 01/15/15 | IP: (132.3.61.78) | Report this post to a Moderator

Fish
Member
392/2000


Galant VR-4 org Post #: 1215004 posted 08/21/15 08:06 AM     Remind Me!  Send Private Message   Edit Post      
If it was me I would check out the mpi relay.

Posts: 206 | From: Idaho Falls, ID | Member Since: 11/13/12 | IP: (159.118.221.240) | Report this post to a Moderator

Spyke169
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Galant VR-4 org Post #: 1218622 posted 10/15/15 11:09 PM     Remind Me!  Send Private Message   Edit Post      
Is the alternator puttibg out the proper voltage and amperage?



'90 Galant GSX, Daily Driver
'93 TSI AWD, Project Car
Sold the VR4s that I have owned, miss them everyday.


Edited by Spyke169 (10/16/15 01:50 PM)

Posts: 324 | From: Greenfield, Wi | Member Since: 08/17/05 | IP: (23.126.194.184) | Report this post to a Moderator

OldHairyBastard
I take bottom on trannies
1/0000


Galant VR-4 org Post #: 1218984 posted 10/22/15 07:19 AM     Remind Me!  Send Private Message   Edit Post   
How about the fuel pump going bad. Start soaking your nuts.-LOL



1990 G-GSX-RS Conversion-138M
1999 Toyota Camry 3.0L V6-210M
2008 Toyota Sequoia 5.7L V8-125M
2013 Toyota Tundra 5.7L V8-107M
2017 VW Passat 1.8L Turbo-45M
2019 Cevy Camaro SS 1LE-5M


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