Engine stalls while driving?

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This sounds like the engine is starving of fuel but with the low fuel mileage we need to suspect it is a rich condition.

We need to do three things. First, test the fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Second, if you have a scan tool we need to monitor the o2 sensor data and see what the short and long term fuel trims are saying.

Last we need to pull a spark plug or two and see what they look like. If they are showing signs of rich condition then we can go after possible high pressure or injector leaking.

With all this info we should be able to get a good idea. Thanks
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
ANDREW BERRY
  • MEMBER
  • 3 POSTS
All plugs and wires are new as are the injection idle, air, temp, map sensors, but it's now blowing fuel out of the exhaust. Would pressure cause this or a cracked head like in simis?
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Yes. This could be caused by excessive pressure. The most likely cause are leaking injectors that are just dumping too much fuel. We need to start with checking the pressure and go from there. Thanks
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
ANDREW BERRY
  • MEMBER
  • 3 POSTS
Pressure a little low on numbers 3 and 4, but not bad.
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I am not sure I understand. Did you check fuel pressure or compression?

Here are guides on both. Let me know if you did one of these or something else. Thanks

https://www.2carpros.com/articles/how-to-test-engine-compression

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
MARK1208
  • MEMBER
  • 1 POST
  • 1998 NISSAN PATHFINDER
Can the positive wire from the battery, if shorted cause a complete shutdown of the vehicle?
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
I don't know about that but it could have caused some fuses to blow, like the computer fuse and other fuses that will stop the vehicle from operating check here under the hood fuse box make sure all fuses are good
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Wednesday, September 30th, 2020 AT 3:25 PM (Merged)
Tiny
KAOTIC
  • MEMBER
  • 1 POST
  • 1997 NISSAN PATHFINDER
  • 198,054 MILES
I don't know much about cars but when I start its fine and it stalls and rides rough
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Wednesday, September 30th, 2020 AT 3:29 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
I would start with the simple things first, do a tune up, plugs leads, air & fuel filter, scan for any unresolved fault codes, check for vacuum leaks, start here
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Wednesday, September 30th, 2020 AT 3:29 PM (Merged)
Tiny
RMANZO
  • MEMBER
  • 1 POST
  • 1997 NISSAN PATHFINDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 147,000 MILES
My wife has a 1997 pathfinder. She states that when she is driving the car shuts off by itself while driving, then she puts it in neutral turns the key and it starts again. She says that it happens at least once a day
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Wednesday, September 30th, 2020 AT 3:29 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi rmanzo,

It sounds like you have a crankshaft angle sensor that is going out but to be sure this guide will help us fix it.

https://www.2carpros.com/articles/engine-stalls

Please run down this guide and report back.
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Wednesday, September 30th, 2020 AT 3:29 PM (Merged)

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