03 Altima ( 2.5 ) crank position sensor - retired ASE Master Teck
5 weeks after purchase ( 110K miles ) on & off runs like 3 or 2 clys - code - Crank sensor circuit A - 8 weeks later -instal OEM crank sensor very small change - then install OEM cam sensor . now cranks a Long time and will eventually start - battery finally gets to low - Now new battery - wont start at all - re-install 2 old sensors -starts right up .BUT after 1-2 or 32 miles on & off from smooth 4 cyl. to rough like 3 -cyl -just like flips a switch ; normally runs smooth cold & at times will switch from rough to smooth in just seconds -or last hours . I am a old smart Mechanic .and hope someone out there is much smarter --PLEASE try to help me
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Re: 03 Altima ( 2.5 ) crank position sensor - ...
Does the check engine light flash or is it on when the car misfires?? Bythe way, Nissan has a new program available for your ECM/computer for the long cranking condition. Check with your local NIssan dealer. Also spark plugs are rated for 105K, You have 110K on it. Check your plugs and make sure, that you use NGK if they need to be replaced. Also, look at your overflow bottle. If its down, top it off to FULL mark and monitor the level for few days. See if it goes down in like a week. I have seen some headgasket problems, where the coolant gets into the cylinders and drown the spark plug, causing a misfire. Let me know what you find. Lets get to the bottom of this and lets fix it.
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I changed one on a 03 sentra and it was under the car by the exhaust entering the crank case. You can not miss it because it is the only object with a wire that is mounted to your engine block. Crank sensors will be close to the crank and cam sensors are close to the cam. I hope that this info helps.
There are so many sensors on cars now a days its hard to say, i can take a guess,you may need cam and crank sensors and the other sensors may be the oxygen sensors, this car is a 2005 this many sensors going bad at once is crazy, even with 100,000 miles on it, i would have a second reapair shop or dealer look at it,
a crank position sensor , sends a signal to pcm about crankshaft position signal, the sensor controls spark timing and firing order. the signal is also used for pcm to detect a missfire!! it also sends this info to ignition module, any mechanic can replace a crankshaft sensor!! call a auto parts store and see if you can get one, the cost should be a lot less.
Clean out the Idle Control valve. remove the air duct from the aircleaner system. spray directly into the valve opening. it is a small component with 2 small hoses . Sludge build up and oil deposits will dirty the valve. If that does not work you can remove it and spray directly into the 2 holes on the underside of the valve. Clean the air filter or replace it.if that is not it, then it is probably the EGR valve.
I have 10 years experience in a Nissan dealership and I know without a shadow of a doubt that the Crankshaft Position Sensor is NOT located next tp the crank pulley... it is rather at the other end of the engine near where the transmission bellhousing bolts to the engine block. It is on the side toward the firewall near the bottom. Even if you can get the vehicle on a lift and get under it, you can't really see it... It's more of a feel thing... There was a campaign (recall) on these engines to replace Crank Position and also Cam Postion sensors. Check with your dealer- the campaign might be open. You will need your VIN number when you call.
A common problem on this vehicle is failure of the Crankshaft Position (CKP) Sensor. Failure of the CKP Sensor will result in the vehicle not starting. The cost to repair the CKP Sensor is estimated at $29.13 for parts and $26.00 for labor.