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2007 Nissan Pathfinder SE, 4.0L, 2WD, 175k
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Discussion Starter #1
Recent engine replacement due to other issues. Engine computer throws cam sensor code. Cam sensor has been replaced - no change.
Vehicle runs fine until warm with cam sensor plugged in. 20 min from cold, or 10 min if already warm. Then sputters and generally runs horribly.
Unplug the cam sensor and the vehicle takes 3-4 seconds to start but runs great. Service Engine Soon, VDC, and SLIP lights are on the dash. In addition the MPH reading on the digital part of the dash is sporadic at best and stays stuck at the last reading.
Wheel speed readings on diag machine are good.
Suspect Engine control computer ??? Any other ideas ???
 

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Registered
2007 Nissan Pathfinder SE, 4.0L, 2WD, 175k
Joined
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5 Posts
Discussion Starter #2 (Edited)
Recent engine replacement due to other issues. Engine computer throws cam sensor code. Cam sensor has been replaced - no change.
Vehicle runs fine until warm with cam sensor plugged in. 20 min from cold, or 10 min if already warm. Then sputters and generally runs horribly.
Unplug the cam sensor and the vehicle takes 3-4 seconds to start but runs great. Service Engine Soon, VDC, and SLIP lights are on the dash. In addition the MPH reading on the digital part of the dash is sporadic at best and stays stuck at the last reading.
Wheel speed readings on diag machine are good.
Suspect Engine control computer ??? Any other ideas ???
forgot details: 2007 Nissan Pathfinder SE. 2WD. 4.0L
 

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Registered
2007 Nissan Pathfinder SE, 4.0L, 2WD, 175k
Joined
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5 Posts
Discussion Starter #3
***Update - ran errands with vehicle today and died pulling into parking lot of second stop. Roughly 30 min after pulling out of driveway. This is consistent that it runs until warm and then dies. Won't start until cool. Then runs like a champ until warm again. Seriously frustrating!
 

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Sup Mod keeping the peace
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6,874 Posts
A common problem with random engine shutdowns is a marginal camshaft position sensor or a marginal crankshaft position sensor. Most of the time when this happens, the "check engine light" never comes on; subsequently when performing an ECU code readout, there was no fault code set. There's been many members here on the forum that have had problems similar to yours and the fix was replacing those two sensors.

The best and cheapest fix for this situation is to replace both sensors at the same time; the reason for doing this is there is no way to determine which sensor is at fault with this type of condition. You can take your vehicle to a dealer/repair shop and they'll tell you there is nothing wrong after they go through with diagnostic tests because at that time the vehicle was running OK. You could end up spending $200 or much more depending on how much time/parts are used.

When replacing sensors, always use Nissan OEM parts from a Nissan dealer; aftermarket electronic items generally are not reliable, don't last long, and many times are DOA. The sensors are not very expensive; around $75.
 

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Registered
2007 Nissan Pathfinder SE, 4.0L, 2WD, 175k
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5 Posts
Discussion Starter #5
@rogoman Thank you for the response. The camshaft sensor has been replaced (twice), but I will check the parts list for the crankshaft sensor. Thinking from what I have read that is the one on the transmission housing ??
Also considering that the ECU has a heat related fault that shows up when the engine compartment is heat soaked ??
Unfortunately a reputable used ECU seems hard to come by.
Thanks again! @rogoman
 

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Sup Mod keeping the peace
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6,874 Posts
The crankshaft position sensor is located on the oil pan facing the gear teeth (cogs) of the signal plate.

Most ECUs are encased in a metal box that provides a good heat sink; so generally don't have a heat problem. However that's not the case with cam/crank sensors as they are much more susceptible to failure from engine heat.
 
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