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Sedans Nissan Altima Nissan Altima Engine Failures
495 messages, Last post on Nov 06, 2009 at 9:53 AM
You are in the Nissan Altima Forum. Your Hosts are pat & karens
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Replying to: krzy10boomr (Aug 02, 2008 7:13 am) One thing to check first - Do you loose any coolant from the radiator coolant tank, or do you have to add any coolant, and if so, how much and how often? The symptom sounds like a small amount of coolant leaks into the cylinder when the engine is shut off. Later when the engine is cooled down and restarted, the small amount of coolant in the cylinder causes the spark plug to missfire for a minute or less, until the coolant is all blown out, then the engine runs normally. The high idle may be related to the above or not. Check the PCV valve and check for vacuum leaks. Look for unplugged, loose, or cracked vacuum hoses. Check to be sure the upper and lower intake manifold bolts are all tight. Check to be sure the the O-Rings at each injector is not leaking or sucking air. Squirt oil on these things and listen to see if the speed of the engine changes. Connect a vacuum gauge to the intake plenum and see if the vacuum is good and steady. Fuel injector #3 might be the problem, but not as likely. Do you use a fuel system cleaner or additive? You should add a fuel cleaner additive to the gas tank at least every oil change, to keep the injectors clean. If you have not added any, try adding some and give it time to work. Use an STP type or Seafoam. Another problem that may cause the high idle could be the throttle body, Try carefully cleaning it with throttle body cleaner. Be sure the air filter is clean and that the air intake tube is not cracked or leaking anywhere. Sometimes, the Mass Airflow sensor needs to be cleaned, but they don't usually give problems on these vehicles, unless they are allowed to get dirty. Good Luck, E.D. ISF |
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Replying to: electricdesign (Aug 01, 2008 6:49 pm) The serpentine belt you mentioned just made me remember something.Is it the same thing as the fan belt? and what is the tensioner? The belt in my Altima (right side of the engine) wobbles and it appears its the lowest pulley holding the belt that does that and causes some vibration when I put on the A/C. I think I need some help with regards to this.Does the pulley get damaged and does the wobbling affect the function? Thanks, Chuma.
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Replying to: ndiboy (Aug 04, 2008 5:02 am) Good Luck, E.D. ISF
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Replying to: electricdesign (Aug 04, 2008 6:46 pm) 'GROOVED pulleys are on the INSIDE of the belt loop, and SMOOTH pulleys are on the OUTSIDE of the belt loop'. This is not clear to me.Which one is the autotensioner? Is it the pulley above and just behind the compressor pulley? Thats the one that wobbles a bit when the engine is idling.The compressor pulley is grooved while the one I am referring to, next to it is smooth and on the outside(just went to examine them). Is this the meaning of the statement above? that is the grooved pulleys get the rough part of the belt while the smooth ones get the smooth part of the belt which is on the outside. Thanks, Chuma. Is the autotensioner one of the smooth pulleys
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Replying to: ndiboy (Aug 05, 2008 2:34 am) Smooth pullys are outside the belt loop, the back of the belt rides on the smooth pullys. The pully that you see bouncing (not wobbling), is the autotensioner. Good Luck, E.D. ISF
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Replying to: electricdesign (Aug 05, 2008 11:00 am) Thanks, Chuma. |
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| How hard is it to replace the crank sensor on my 02 nissan altima?? My car keeps stalling and is hard to start. | |
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Replying to: acevedo669 (Aug 18, 2008 6:35 am)
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Replying to: Mr_Shiftright (Aug 18, 2008 8:05 am) |
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Replying to: acevedo669 (Aug 18, 2008 6:35 am) MAKE/MODELS: MODEL/BUILD YEARS: Nissan/Altima 2002 2005-2006 Nissan/Sentra 2002 2005-2006 MANUFACTURER: Nissan North America, Inc. NHTSA CAMPAIGN ID NUMBER: 07V527000 MFR'S REPORT DATE: November 08, 2007 COMPONENT: Engine and Engine Cooling POTENTIAL NUMBER OF UNITS AFFECTED: 653910 SUMMARY: On certain passenger vehicles equipped with a 2.5L engine, the crankshaft position sensor can overheat causing a brief interruption in the signal output from the sensor. CONSEQUENCE: If the interruption in the signal from the crankshaft position sensor is so brief that the Electronic Control Module (ECM) logic does not have time to diagnose the condition, the engine may stop running without warning while the vehicle is driven at a low speed increasing the risk of a crash. REMEDY: Dealers will reprogram the ECM free of charge. Certain M/Y 2006 Altimas which have been previously remedied under recall campaign 06V223000 (Nissan R0606) are not included in this recall since the reprogramming for 06V223000 also included this reprogramming. The recall is expected to begin on or about December 10, 2007. Owners may contact Nissan at 1-800-647-7261. NOTES: This is an expansion of a previous campaign (06V223000). Customers can also contact The National Highway Traffic Safety Administration's Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV. DESCRIPTION: Component Description The crankshaft position sensor (POS) is located on the cylinder block rear housing facing the gear teeth (cogs) of the signal plate at the end of the crankshaft. It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet and Hall IC. When the engine is running, the high and low parts of the teeth cause the gap with the sensor change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes. The ECM receives the voltage signal and detects the fluctuation of the engine revolution. REPLACEMENT: 1. Loosen the fixing bolt of the sensor. 2. Disconnect crankshaft position sensor (POS) harness connector. 3. Remove the sensor. These sensors can be checked by an ohm meter but I don't have the terminal positions or the values. A repair manual would probably show you these.
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