Hey everyone
So before I start, I just want to say that I have searched this forum extensively before deciding to post, but haven't been able to solve the problem.
Details:
2004 MT with 117000 miles, about 2000 miles on rebuilt engine, running BHR midpipe.
I have been having serious flooding issues when the engine is cold, so much so that it essentially never starts when cold. Even extensive flood clearing hasn't been successful, I've had to hill start it twice now. It has started once when cold, but was only firing on the front rotor, and died quickly afterwards. Hot starting is no problem, and I've experimented with luke-warm starting (?), essentially starting it 30 mins after shutting it off (fully up to temp). It will start, but with difficulty, and often only after a couple of flood clear cranks.
Now I know that flooding is usually due to poor ignition health, but I've replaced the plugs, coils, and wires to no avail. Battery is relatively new, and was tested by the dealership and found to be OK. I installed the upgraded starter a few months back, and it still cranks quickly and powerfully.
Compression is another big cause, but I had the engine tested and compression is within acceptable ranges for all faces of both rotors.
Additionally, there are no misfires at all once she is running, and no problems idling.
My next thought was the engine running too rich due to O2 or MAF sensor failure, which I suppose is still possible. However I cleaned the MAF, and also calculated my highway gas mileage (which I figured would be very low if there was a rich condition). I got 18.5 mpg cruising at 80+ with a somewhat heavy foot when passing. That seems pretty good to me.
I also read about faulty water jacket seals fouling spark plugs and causing flooding, however I haven't noticed any white smoke, and I would think that such a failure would also manifest itself in very low compression numbers.
Other things I've tried: clean ESS, reset PCM (brake stomp method)...
One other thing: Occasionally while driving I get hesitation and bucking under acceleration, accompanied with sporadic P0420, P0661, and P2259 codes. Now I believe this is due to an SSV that sometimes sticks, (there's a fair amount of carbon on it), which I haven't gotten around to cleaning yet. I don't see how this would contribute to the flooding problems, but I figured I would include it for the sake of being thorough.
Any ideas?
So before I start, I just want to say that I have searched this forum extensively before deciding to post, but haven't been able to solve the problem.
Details:
2004 MT with 117000 miles, about 2000 miles on rebuilt engine, running BHR midpipe.
I have been having serious flooding issues when the engine is cold, so much so that it essentially never starts when cold. Even extensive flood clearing hasn't been successful, I've had to hill start it twice now. It has started once when cold, but was only firing on the front rotor, and died quickly afterwards. Hot starting is no problem, and I've experimented with luke-warm starting (?), essentially starting it 30 mins after shutting it off (fully up to temp). It will start, but with difficulty, and often only after a couple of flood clear cranks.
Now I know that flooding is usually due to poor ignition health, but I've replaced the plugs, coils, and wires to no avail. Battery is relatively new, and was tested by the dealership and found to be OK. I installed the upgraded starter a few months back, and it still cranks quickly and powerfully.
Compression is another big cause, but I had the engine tested and compression is within acceptable ranges for all faces of both rotors.
Additionally, there are no misfires at all once she is running, and no problems idling.
My next thought was the engine running too rich due to O2 or MAF sensor failure, which I suppose is still possible. However I cleaned the MAF, and also calculated my highway gas mileage (which I figured would be very low if there was a rich condition). I got 18.5 mpg cruising at 80+ with a somewhat heavy foot when passing. That seems pretty good to me.
I also read about faulty water jacket seals fouling spark plugs and causing flooding, however I haven't noticed any white smoke, and I would think that such a failure would also manifest itself in very low compression numbers.
Other things I've tried: clean ESS, reset PCM (brake stomp method)...
One other thing: Occasionally while driving I get hesitation and bucking under acceleration, accompanied with sporadic P0420, P0661, and P2259 codes. Now I believe this is due to an SSV that sometimes sticks, (there's a fair amount of carbon on it), which I haven't gotten around to cleaning yet. I don't see how this would contribute to the flooding problems, but I figured I would include it for the sake of being thorough.
Any ideas?
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