I saw your response to a similar thread, but never saw a conclusion as to what the problem really was. My brother-in-law brought me his 1998 Altima to look at. It is difficult to start but once started, idles fine. If you accelerate slightly, the engine will rev to several thousand RPM. However, if you accelerate just slightly more, the engine bogs down and returns to below 1000 RPM. We changed the fuel filter on Autozone's recommendation, to no avail. A local mechanic is now saying fuel pump, but that doesn't sound like a fuel pump to me. As the engine heats, it begins to backfire through the air intake when you accelerate more than slightly. It sounds to me like the timing is being advanced too much based on the acceleration (vacuum advance I assume). There is no check-engine light though. Thoughts? The local mech wants $375 to change the fuel pump, which is fine if that's the problem. I am not convinved though.
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Sorry, for the slow response. That sensor your refferring to
is the MASS Airflow Sensor,which seems to be bad. Take the
sensor off the air intake hose and see if anything is stuck in the
element. It is very delicate,so be careful. Reconnect it and if you have a digital multimeter,check to see if the voltage across the
power side is no more than 5 volts. I'm betting it's bad. Good luck.
It's really hard to tell how much it will cost to fix this because you don't know how much damage has been done to the engine itself because of the blown head gasket. Assuming you caught it early and there is no damage to the engine, you are looking somewhere between $1100 - $1400. A website you can look at that gives you prices for repair estimates is http://www.repairpal.com. Thanks for rating my response but please let me know if you have any more questions before deciding you give a poor rating. Thanks for using FixYa!
Could be the bearings in your alternator have gone dry and your alternator is about to quit out on you. I had a friend with an 01 altima and we could always hear him coming before we saw him because of this very problem. Changed the alternator out and noise went away. Thanks for using FixYa!
It seems that you may have a dead clyinder. An engine compression test has to be preformed first to determine if this is in fact true. If you do have a weak or dead clyinder, it could be the cause of two failures. Braken or worn piston rings, or more commonly, burnt valve. Either one of these conditions will cause you to fail smog test.
Both of these jobs are also major repairs. I worked for Nissian/Datsun for many years rebuildng their engines.