No spark after engine ran hot

Tiny
BAMA64
  • MEMBER
  • 2006 NISSAN ALTIMA
  • 0.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 250 MILES
I have the car listed above it ran hot turned the car off, went back later after it cooled to add water cranked the car only ran for a second. Now have no spark, will not start. The motor doesn't seem to be turning fast enough. What can be wrong? Help please have been doing everything that I know how.
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Wednesday, June 2nd, 2021 AT 8:28 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

How badly did the engine overheat? Is it possible for you to record it cranking and upload it for me to hear?

As far as the no spark issue, the most common cause is a faulty crankshaft position sensor (CKP). If you have a tachometer in the vehicle, see if it moves at all while cranking. Also, if you have a live data scan tool, you can check to see if there is an RPM signal.

If there is no RPM signal or the tachometer doesn't show movement, this is the likely cause.

Here is a link that explains what a CKP is and how it works. I thought it may be of interest to you.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

Also, I attached a pic of its location on your vehicle below.

If you determine there is no signal from the sensor, here is a link that explains how in general one is replaced. It will be a good reference for you.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Let me know what you find or if you have other questions. If possible, record it cranking so I can hear it. If the engine was hot enough, you may have blown a head gasket as well.

Take care,

Joe

See pic below.
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Wednesday, June 2nd, 2021 AT 5:27 PM
Tiny
KASEKENNY1
  • EXPERT
Can you get a video of the engine trying to start? If it seems like it is not turning fast enough then you may be having a larger engine issue. The way this works is the crank sensor needs to see the engine turning to determine when to fire the plugs. If it is turning slowing then the crank may not be able to register the pattern for the PCM to recognize it and so it doesn't deliver any spark.

Here is a guide that has some info on this:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

However, if this is the case then we need to start with checking the battery to make sure it is able to turn the engine properly.

https://www.2carpros.com/articles/car-battery-load-test

If the battery is okay then I am thinking we have a possible bearing issue that is causing the engine to lock up.

Can you change the oil and make sure it is not mixing with coolant. Here are two guides that will help with this as well:

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

https://www.2carpros.com/articles/head-gasket-blown-test

Let's run through all this info and let us know what you find and if you can get that video of it cranking. Thanks
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Wednesday, June 2nd, 2021 AT 5:27 PM
Tiny
BAMA64
  • MEMBER
Now the computer won't communicate with my scanner I can't get any codes. Is the car's computer bad? Was getting some codes couple of days ago.
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Wednesday, June 2nd, 2021 AT 6:26 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Do you remember what codes were present? Also, does the scanner power up normally?

If you look at the pic below, it shows the DLC. I highlighted pin 16. That pin should have 12v at all times. Check for power.

Pin 4 is chassis ground, so check it for continuity to ground.

Let me know what you find.

Joe
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Wednesday, June 2nd, 2021 AT 8:42 PM

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