Question about 1998 Honda Passport

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P0300 1998 honda passport

P0300 code reappears when engine is warm. my mechanic replaced the timing belt, fuel pump and filter checked and cleaned all the injectors. our test show fuel trim problems on the right bank only. truck ran better when unplugged the map sensor. we also replaced the maf. we can not find a vacuum leak. we replaced the right cat also. anyone have any ideas???

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These are notorious for intake leaks. If you can't find any vacuum leaks, verify the timing belt installation is correct. The timing marks on these are actually set up for having #2 on tdc, instead of #1, and the belts, and pulleys are marked accordingly. It's nearly impossible to set it up on #1 due to valve spring tension trying to rotate the cams. That's where I would start. The timing can be off one or two teeth without noticeable running issues. But likely you will get a check engine light with fuel trim codes like you have. Good luck!

Posted on Jun 10, 2014

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SOURCE: Honda s2000, 2001 loose of

Sounds like an ignition component failure check for proper resistance through primary and secondary ignition coil windings, refer to service repair manual for exact specs, also the ignitor magnetic pick up may be not up to snuff, the only other ignition component to replace or check is the ignition module and/or plug wires themselves, sometimes when extreme demand is put on the ignition system the plug wires must be high quality and completely isolated from one another. Spark plug wires when routing cannot come in contact with one another in the slightest proximity.

Posted on Aug 23, 2009

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SOURCE: 98 passport 3.2v6 hard to

I had the same problem with my Passport and it was the fuel pump going bad. The pump was not producing enough pressure to get the fuel into the fuel system. A local shop discovered the problem when they did a pressure test on my fuel system.

Posted on Jun 06, 2011

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I had the same problem with my Passport and it was the fuel pump going bad. The pump was not producing enough pressure to get the fuel into the fuel system. A local shop discovered the problem when they did a pressure test on my fuel system.

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