I have a 1999 honda accord v-6 automatic with 192,000 miles.
I've been getting the codes P0171, p0300 P0301-P0306.
I have replaced all spark plugs and wires, new rotor and cap.
clean the EGR system and replaced the EGR value.
Car does not run bad at idle but upon acceleration when cold
it has severe hesitation. But after a mile or so it runs smooth.
I drive 65 miles to work and I notice that after 30 minutes or so it will start to miss at higher speeds. Somedays if you warm it up first, it does not appear to have any problems??? The check engine light keeps comming on with the above codes.
Any help??? anyone else have these issues??

 

P0171 is fuel system too lean. The other codes indicate missing on all cylinders. This code arises when fuel system has to compensate for either additional air or lack of fuel supply.

I found P0171 recently on a Toyota Celica and traced at least part of the problem to intake air leaks. In my case, several leaks in PCV hoses.

Suggest inspecting intake system carefully for air leaks; intake duct, hoses, PCV system, brake booster vacuum line, and other vacuum lines. In your case the system is so lean, the ECM cannot completely compensate and lean missing is occurring.

It is possible to be low fuel supply, and a fuel pressure check can determine if this is a possibility.

good luck

 

OP-sorry for this. TX, I was wondering how it turned out on her car....looks like you made good progress.

 

I'll followup to my original thread.

regards

 

I had a mechanic look for leaks in the vacum system. He found none.
May have to take to dealership but leary that they will just start by replacing unnecessary parts.

 

Since you don't DIY, you'll have to take to someone for repair.

Suggest doing some research on good shops specalizing in Acura/Honda repairs. An Angies List suscription ($40) is a good investment to find a good shop you can trust. Screen shops for multiple reviews (at least 5) and A rating.

good luck

 

kinda havining the same problem but my car is running just fine. replaced distrib, cap and rotor, plugs, and wire and CEL was still popping up for p0300 p0301 p0303. so i replaced the ****ty old battery and the CEL is gone. got to drive it for a bit to see if problem solved.