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  #1  
Old 06-28-2011, 04:09 PM
m33bp
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Default 2004 Maxima hard Hot Starts

About a week ago I got a p0340 & p1800 code, car had hard starting while HOT and for some reason the Car Horn stayed on after hitting keyfob to lock.
Cleared codes and got the 340 again. So I did my homework and read a lot of post from this site and became a member. I have recently replaced both Cam Sensors and the Crank sensor. Drove my car and I am still have hard Hot starts.
Nissan said might need to reprogram ECU. Any thoughts? The forum has been a big help, Thanks!!!
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  #2  
Old 06-30-2011, 07:02 AM
slaponte
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You might want to search for a ECU reset procedure for your model. There is supposed to be a process (key on, tap the accelerator, blah blah) that resets your ECU. Some of the more advanced ODB readers can do it, cheap ones won't.

I just ran into the exact same situation (P0340) on my 350Z. The weird thing is there is a recall for that on the Z, seems they consider it dangerous for Zs but not for Maximas?? :-P
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  #3  
Old 07-01-2011, 06:08 AM
m33bp
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Thanks I will look into the Reset.
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  #4  
Old 07-01-2011, 10:25 AM
m33bp
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update
Googled ECU reset, got a lot of hits, read most of what I found and saw several steps in common. Followed the steps and cars started right up, better that it has since the codes, hope that was all it needed. Will keep up to date on progress.
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  #5  
Old 07-01-2011, 04:31 PM
m33bp
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Update.

No luck on the ECU reset. drove car about 5 miles to store and it wouldn't restart, once I parked, it took about 20 minutes for it to cool before I got it to go.
I need suggestions.
Thanks.
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  #6  
Old 08-21-2012, 01:41 AM
2004maxi 2004maxi is offline
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2004 Maxima
 
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Quote:
Originally Posted by m33bp View Post
Update.

No luck on the ECU reset. drove car about 5 miles to store and it wouldn't restart, once I parked, it took about 20 minutes for it to cool before I got it to go.
I need suggestions.
Thanks.
i have the same problem in 2004 maxima, changed both cam shaft sensors, battery, starter, etc still have problems in hot starts, have to wait for it to cool down, did you ever managed to find the solution???? it would really help...
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  #7  
Old 08-21-2012, 07:12 AM
DCARLTON DCARLTON is offline
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I don't know if this is your problem or not but my 95 Maxima had a similar hard start issue although it was when it was cold or would sit over night - driving it someplace after it started and then restarting it wasn't a problem.

It would turn over but wouldn't start.

After replacing most everything fuel system related, I took it to my friend's shop and he diagnosed it as the ignition switch - I thought, no way.

After replacing the ignition switch, she cranks like a new one. Not sure how to diagnose this issue as it didn't throw any codes.
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1995 Maxima SE (313,000+ miles 10/2012)
1997 Maxima (193,000 miles - bought from daughter when she traded for a Hyundai Elantra Coupe)
2002 Altima (daughter - totaled 12/2011 with 210,000 miles)
2012 Altima (daughter - replaced 2002 with 8 miles, now with almost 30,000 miles)
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  #8  
Old 08-21-2012, 04:05 PM
wau wau is offline
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2000 Maxima
 
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Try to change the engine thermostat it could sent wrong sigal to ecu.
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  #9  
Old 08-22-2012, 06:12 AM
bobflood bobflood is offline
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Quote:
Originally Posted by wau View Post
Try to change the engine thermostat it could sent wrong sigal to ecu.
Not sure you meant "thermostat" - did you mean "engine temp sensor?" If temp sensor is bad, it could be telling computer that car is cold when it is not. Not sure how many temp sensors vehicle has - some cars have separate sensors for temp guage and computer. Good luck.
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