1999 Honda Accord Check Engine Light with stall

1999 HONDA ACCORD
12,600 MILES • 4 CYL • FWD • AUTOMATIC
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SKYBLUE42
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The check engine light comes on periodically from April through Oct. The light goes out after a few start cycles...usually less than six and 20-30 miles driven. Error code is an oxy sensor fault I think. This has been consistent for two years. This does not occur during an Indiana winter. Just warm months. Occasionally, during the warm months, the engine will hesitate upon acceleration. PFM mechanics have not found anything wrong after many visits. They did install a device that logged engine parameters and which lead them to believe they needed to clean the fuel ejectors. No change. Any ideas....
Mar 30, 2009 at 8:42 AM
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F4I_GUY
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I have seen oxygen sensors cause problems on these vehicles. Once the vehicles enters closed loop (the PCM reads the oxygen sensor) the vehicle will start running rough.

Does the stalling/rough running only happen when the vehicle is warm?
Mar 30, 2009 at 11:02 AM
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SKYBLUE42
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No. Usually this occurs when the car has just been started. But, it has happened after driving a few minutes as well. The car will hesitate when you push the accelerator. The rpm will drop and its stutters, then revs up normally and goes fine. This does occur more often if I am aggressive with the throttle but still occurs when I am easy going on the acceleration. Then, nothing will happen for a few weeks and boom, it happens all over again. The check engine light may or may not come on. Light seems random. And, both engine hesitation and light only occur during the warmer months...not during the dead of winter. I get the check engine light, on average, once a week.
Mar 30, 2009 at 11:31 PM
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F4I_GUY
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Scan the ECM and retrieve all current, pending and history DTC's and post them up for me please so I can further assist you.
Mar 31, 2009 at 10:52 AM
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SKYBLUE42
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Checked the codes today. Same code comes up every time the check engine light comes on and I go to PFM to check what they code is.

P0170: fuel trim bank 1

P0171: System too lean bank 1
Mar 31, 2009 at 12:45 PM
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F4I_GUY
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[url]https://www.2carpros.com/first_things/why_does_my_engine_have_a_lean_mixture_code.htm[/url]

This link explains what that code means and what you can check.

The first things I would check on that particular vehicle would be the fuel pump, so hook up a fuel pressure gauge, vacuum leak, and failed injectors. Also it could be your oxygen sensor(s) have flat-lined, however this would most likely set an oxygen sensor code as well.
Apr 1, 2009 at 10:04 AM
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