Question about 1999 Nissan Pathfinder

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Car problems. Contd yes it shuts off completely. It will start right back up. Yes it does mostly happen when hot outside or when the engine is hot. Yes i always l allow my tank to get real low (which i probably shouldnt). Yes it normally runs well. It would run good either way hot or cold. This the first real trouble ive hd and ive hd this truck over a year.

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Ok first you must stop allowing the fuel to get low keeit at least 1/2 tank at all times because the fuel covering the fuel pump in the tank cools it and makes it last longer remember this: its much easier to fill up the top half of the fas tank than the bottom half and cheaper too here in Wa state gas is still 4$ for reg and $4.80 for premium anyway
The fast that it starts right back up makes this problem much more broad as to what it can be. Because if it were a electronic module it would have to cool a bit before it would start. Does it Idle excessivly low now as compared to the way it used to? Theck for vacuum hoses adn caps (small plugs on the drivers side rear of the top of the engine make sure none are missing or cracked to a point where there is a hole.
Also check the air intake hose for any cracks or holes rake it off and clex it and inspect closly make sure its on completely and the clamps are tight
Does this problem happen if the fuel is half or more full if tou don't know fill it up and see and keep it more than half all the time

Posted on Aug 19, 2008

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2 Answers

Engine shuts off when it comes to hot


Jay :
Hello and thank you for using JustAnswer.com
Jay :
do you have any codes stored? other than the swirl valve code?
Customer :
no other codes than 2 codes for swirl switch but this is only because i have the wrong ecm installed, the problem with engine shutting down is still presant witch leads me to believe we still have problem other than ecm
Jay :
you still have the original Ecm correct?
Jay :
How does the car run cold? Do you have a Scanner or a code reader?
Customer :
car was originally towed in with transmission problem , multiple misfires and bad oxygen sensor. customer wanted used transmission and all coils replaced along with the new oxygen sensor, customer picked up car, a few days later on the highway engine starte lossing power and stalled out. car restarted after sitting but only traveled a few miles before dstalling out again , we towed car in, started diagnostics and came up with ecm , yes we still have origial ecm
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we never had any DTC'S in memory with the getting hot and shutting condition , car runs perfect cold and yes we do have snap on and mac scanners
Jay :
Plug in the original Ecm and start the car. Monitor the Air and Fuel mixture readings and let me know what they are. Check these readings as the car warms up and let me know what they are.
Customer :
won't i need to have the original ecm flashed for the security system ?
Jay :
it should still be programed
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But you can use the ecm you have in the car
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the original ecm will not start car , will run test with new ecm
Jay :
k
Jay :
Also try this and let me know what happens when you try this. Get the car all warmed up until it stalls. Then unplug the MAF sensor and see if the car starts and idles.
Jay :
Let me know, thank Jay!
Customer :
with car running MAF @.42 / ign. advance HERE is a copy of it.
Jay :
I have seen when it comes to Nissans, that after market electrical parts never seem to work right
Jay :
I would go through the harness and do wiggle checks and ohm and voltage drove the wires.
Customer :
after we completed the work we have had to mil light on, even when the car was dying out
Jay :
Cause you have the Swirl valve code. That is why the MIL light is on right?
Customer :
yes now we have the light on for the swirl valve because we have a california emissions ecm in the car, i have to start with finding another ecm and have this one flashed again or do you think i should just install the original ecm and go from there
Jay :
I would go back to the original Ecm, unless you found something for sure wrong with it. Then check the harness.
Customer :
we removed all the after market coils and installed the originals , engine still shut down , we tested for injector pulse and still have pulse but no spark
Customer :
it shuts down at about the same time on each occurance, right now engine shuts down during third cooling fan cycle
Jay :
I wonder if the Ecm is bad? That is odd how on the 3rd cycle of the fans it shuts down.
Jay :
I am sorry I needed to step out for the day and will be out this evening. I will be around tomorrow if you would like to continue, if you would like I can opt out and another expert can assist you. Let me know, thanks Jay!
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