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First off I'd like to say thank you guys for any help that you can give I have a 2000 Nissan Frontier 3.3 it was running just fine and then I was going to work one day in about a quarter tank of gas it just start acting funny I replaced the fuel pump and fuel pump filter the codes that it sent off with the maf sensor and knock sensor. Replace the map sensor it started then act like it going to do good and then it went back to doing the same thing which was better installed dropping RPMs and then finally die after I replaced all the parts I had done said it started up we'll do the same thing and then died now I can't get it to start at all any help would be greatly appreciated
 

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At this point perform an ECU code readout with a portable scan tool to see if any fault codes are set. The tool can be purchased at most auto parts stores. Post the actual codes here on the forum so that we may be able to help you further. If there is one or more fault codes set, they can help point to the malfunction. If you have a copy of the FSM for your vehicle, the code readout procedure is described there along with a listing of codes. You can download a copy of the FSM from this web site: Owner's Manuals. The section EC.PDF is the one you need to read.

At this point you'll have to determine if there's an ignition or fuel delivery problem:

* Testing fuel delivery:
An easy way to test the fuel pump and filter is to disconnect the fuel feed hose from the fuel rail and connect it to a long length of spare hose with the other end draped over the fender going into a catch can placed on the ground. Now turn the ignition key to the run position but DO NOT TRY TO START THE ENGINE. You should see fuel going into the can at a good rate for several seconds.

If the engine is unable to start, turn the ignition key to the run position but DO NOT TRY TO START THE ENGINE. The fuel pressure reading should be around 43 psi which would be a static reading.

The fuel injectors may not be firing. This can be tested with a "noid" light probe for each injector harness connector.

* Testing ignition:
Pull one or more ignition wires to test; use a spare spark plug in the coil pack to test; ground the plug base with a jumper wire to the engine block; see if you're getting a spark while trying to start the engine.

* The cam timing may be incorrect:
Check for a broken chain guide. If the engine uses a timing belt, see if it's broken or it may be cracked and has skipped some teeth.

* There may be a major intake system vacuum leak:
Check the intake manifold nuts to make sure they are tight. The gasket may have failed. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.
 
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