The car srtart well when cold, after a few minutes the mor stop,and smell gaz take a little time it's start again and stop, when trying to start it it wouldn't i have to take a long time again, sometimes quit on me in the middle of the highway, i ghanged everything that i might think who could related to the problem, still the same. in a nissan maxima 1996

Clogged catalytic converter

stop pumping the accelerator because it sounds like you are flooding the engine. 1 press when cold is more than enough

if I'm reading this right...
... the engine starts and dies within a few seconds.
... you jumpered the fuel pump test connector and it will keep running.
... you smell fuel after trying to re-start when it dies.

Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.

Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.it will keep running.

... you smell fuel after trying to re-start when it dies.


Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.


Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.

sounds like you burned up a seal check to see if you have oil in the engine and also check the trans oil level

CHECK OUT VACUME LINES CLOSE GOOD LUCK

make sure your exhaust is flowing freely and the catylitic converter is also.

it soundsl like a computer is braking down

You can try this.
Turn on the key and listen for the fuel pump to prime.
It will sound like a gentle hum. when it stops, turn the key off. wait a few seconds and do it again. Do this three or four times, but don't try to start it. after the third or fourth time you turn it off, try to start it. It may not be priming the fuel injectors fast enough.

faulty computer
faulty wiring
excessive carbon in combustion chamber, when hot, pre-ignition occurs. try using high octane gasoline first, but wait until empty, before filling up. it will take some time before the new gaz gets to the engine as the gaz lines and pump still have the old gaz.

another possibillity is water in the gaz tank.
when cold the gaz enrichment might compensate .

the alternator ground must be loose... try tracing the both negative and positive... tighten the connection... if problem persists try replacing the alternator