So.. took the car in and they pulled the plugs out again. No oil on them but they were all black and everything was misfiring:
P0301, 302, 303, 304.
P0420 also came on as my Cat needs to be replace. This 0420 code came up 1/2 year ago but it went away so I never changed it. I purchased a Magnaflow high flow direct fit Cat already but would this cause the ECU to come on since it is not a stock cat? Purchased the Cat here: http://www.performancepeddler.com/de...CT_ID=MAG22644
The technician at Honda suggested it might be something with the emission. He tried to do a valve adjustment but my car has aftermarkets cams.
He suggest that I should purchase another intake manifold and "hot boil" it and change it. Anyone has any suggestions? The guy wrote down the result of the diagnose test which I have scanned... The handwriting is really bad so bare with it please.. -_-
In the Prelude manual from Honda code 420 is "Catalyst system efficiency below threshold". It says the two probable causes are you secondary o2 sensor or your catalytic converter itself. since you have a relativley new cat i would go w/ the o2 sensor
as for your misfire codes.... when you installed you cams did you adjust the valve lash? If not.... that is your problem. It takes about 30 min to adjust all 16 valves. Just make sure you have a feeler guage.
that's the problem.. when i bought this car, all these aftermarket parts were already installed. I will ask them about the valve lash next time I go in. As for the spark plugs turning black, they said it might be something with the emission. They took off the fuel filter and only a drop of oil came out. Something is clog for sure and they think is the intake manifold. That's why they suggested to purchase another one and "hot boil" it. I never heard of a "hot boil" method and wanna check up with you guys to get your opinions.
go to auto zone or somewhere and look for c-foam or sea foam... i don't know the spelling but you put it in your car and let it idle for like 15 min. it will smoke like a mofo but i cleans everything out....
Don't know what kind of cams they are but will look into it next time when I bring it back to Honda. I have already suggested to my friend about adjusting the lash and he will get back to me about it soon. Thanks for being patience with me. Don't really have time to keep bringing it back and forth on a daily basis.
I'm not sure if this will work. About 6 months ago I swapped my h23 for an h22a1 and everything was fine until I was stuck in some snow about a month ago and I might have done something wrong to the car then because after that my engine felt weak. I thought it was my spark plugs so I changed those. Nothing. Changed my spark plug wires. Nothing. So I left the car running and took out the 4th spark plug wire. No difference. Put that back in and I take out the 3rd and the engine starts to bog put the spark plug wire back in and back to 'normal' again. So I tried the rest and it looked like both my middle cylinders were working fine but when I took the first spark plug wire out the engine would rev up instead of down. Weird right? So I let a few drops of water fall on the headers and the middle ones would make the water evaporate while the outer two weren't as hot. Especially the 4th one. I'm not exactly sure what is wrong with mine but it could need new fuel injectors unless someone here suggests otherwise. I hope this helps because since I'm new to this I don't know all the right terminology and I may not have explained it right so I apologize in advance.
I'm not sure if this will work. About 6 months ago I swapped my h23 for an h22a1 and everything was fine until I was stuck in some snow about a month ago and I might have done something wrong to the car then because after that my engine felt weak. I thought it was my spark plugs so I changed those. Nothing. Changed my spark plug wires. Nothing. So I left the car running and took out the 4th spark plug wire. No difference. Put that back in and I take out the 3rd and the engine starts to bog put the spark plug wire back in and back to 'normal' again. So I tried the rest and it looked like both my middle cylinders were working fine but when I took the first spark plug wire out the engine would rev up instead of down. Weird right? So I let a few drops of water fall on the headers and the middle ones would make the water evaporate while the outer two weren't as hot. Especially the 4th one. I'm not exactly sure what is wrong with mine but it could need new fuel injectors unless someone here suggests otherwise. I hope this helps because since I'm new to this I don't know all the right terminology and I may not have explained it right so I apologize in advance.
Dude, are you saying that your engine runs exactly the same without the spark plug wire plugged in on cylinder # 4????? You have either one hell of a misfire, no compression in that cylinder, or both. Your engine sounds like it's toast. Burnt toast. And it smells like it's time for a rebuild.
Itzroyal, I figured out yer problem. It's the high-flow cat throwing off the reading on your secondary O2 sensor. You can fix it for like $4. Here's a write-up with no pictures. You need 2 spark plug non foulers, and drill one of them out. Connect them together, then connect them to the secondary O2 sensor. Bam! No more issues. It spaces your O2 sensor away from the cat a little, and fixes the P0420, which is probably causing the other random misfire codes. Mechanical o2 Fix - evolutionm.net
Would that cause my spark plugs to turn all black within 2 months of replacing them and driving about 1000 miles?
The oxygen sensor telling the ECU to run your engine rich. Try the non fouler mod. It only costs $4. Honda will not do it for you, but if your O2 sensor was replaced not that long ago, it should be easy to take out. You'll spend longer drilling out the middle of the one non fouler than you will taking out and reinstalling the O2 sensor. And if this doesn't work, hey you only spent $4 and about an hours time. But I'm pretty sure it will. A high flow cat + a P0420 code is pretty much a dead giveaway that this is one of your problems, if not THE problem. Just make sure you take out the O2 sensor in the cat, not the one in the header.
I have a question about the aftermarket cams in my car. Since they brand is unknown, I can't adjust the cams to factory settings. Any suggestions? My car is way over dued for a valve adjustment and it takes forever to warm up the car.
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You have either one hell of a misfire, no compression in that cylinder, or both. Your engine sounds like it's toast. Burnt toast. And it smells like it's time for a rebuild.
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