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Hello, I'm Chris. Thanks for visiting Just Answer.
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Yes I still need help.
I also changed the Coalescent filter. The car starts and all seems OK then after approx. a mile the intermittent miss starts, and is at times seems to run OK then hesitates and misses.
What is causing the random misfire - and does that require changing all 4 of the injectors @ $160 each?
I recommend you check and verify there is good fuel pressure while this misfire is occurring. Trouble code P1399 is a random misfire code displayed by some Honda vehicles. Some scan tools will display P1399 instead of P1300. Check the fuel trims to see if the MAP sensor has a concern and is adjusting the air fuel ratio incorrect.
The 2000 GX has 100,090 miles and was serviced by Honda dealership @ 79,393 mi and replaced 4 injectors ($2,526 parts) and @ 80,461 mi replaced the fuel pressure regulator ($2,099 parts). along with an EGR valve ($294 part).
I used an OBD-II to get the codes for intermittent misfire, and it seems to occur on each cylinder. I have the Honda GX supplement service manual, but unsure of tracking the MAP sensor. Appreciate any assistance with tracing this problem.
Complete the below chart for me.
You've given me info to review and pursue. Sorry about the delay