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New plugs,. Cranks but no start..fuel pump seems to b turning on n when turn key over .no codes r up .did EGR crap all clean n clear..no fuse blown so what am I missing
 

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Admin and Sup Mod keeping the peace
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One of the first things to do is 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 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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NF Mod/Nissan Master Tech
2006 Pathfinder LE, 2003 Frontier SVE
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Spray carb cleaner into the engine and try to start. If it fires on the carb cleaner, then you know it's a fuel related issue. Just because the fuel pump is running, doesn't mean the fuel is getting to the injectors nor does it mean it's getting to the injectors at the proper pressure. Always confirm proper fuel pressure with a fuel pressure test gauge. If it doesn't fire on the carb cleaner, check for ignition spark to the plugs.
 
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