Question about Ford F-150

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1997 f150 4.6ltr engine has just been rebuilt. I drove it for a week everything was fine. engine began hesitating at idle and stumbles upon acceleration. oil pressure gauge fluctuating at idle. missfire codes p0303 and p0307 came up. any suggestions. thanks.

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  • Anonymous Mar 15, 2014

    Runs good at idle, put in gear, temp/oil gauges fluctuate and then sometimes engine dies. have to wait 15 minutes before restarting.

  • Anonymous Mar 25, 2014

    engine is making a tapping noise that can slightly be heard while idling. upon removing oil filler cap, the noise can be heard loud and clear. as if the oil is not getting to the proper places. the engine pressure still is the same.

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2 Answers

Thank you for responding, I went back to basics. New plugs began corroding on#3 & #7 cyl, causing a short(missfires).Tested the coil packs,& I recalled #3 cyl head was cracked, it was replaced with rebuilt head. As for the oil gauge flucuating, crank shaft bearings pitted and worn on #3 & #7cyl, due to the coolant(an apperantcommon problem..I took the truck in for an oil change,a ctc rookie put 5w30 instead of 10w30 as requested,in which caused the oil pressure to fluctuate. I dumped the the oil put 10w30 in and some lucas. 2 weeks later no ticking noises and no oil pressure changes.thankgod for lucus. its too cold to roll a set of bearings in the driveway. thanks again for your input. p s a 1997 f150 4.6ltr come with 2 sizes of serpentine belts, be careful of which one you install, we blew the bearings out of 2 new waterpumps,and for the last tip, the dealership uses a pair of vicegrips and an extra helping hand to set up the timing chains,that is what i was suggested to do by there top engine tech. prove me wrong. works like a charm.

Posted on Nov 07, 2008

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  • 314 Answers

Check for a vaccum leak at the intake. Spray a bit of starting fluid in this area with the engine at idle. This engine will speed up a bit when you hit the spot! Replace the gasket or put the hose back on. Way you go! Frankster016

Posted on Oct 25, 2008

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