got the car back from honda... did the cat work, and cleaned the emission system out again.. a bunch of black liquid came spurting out of the exhaust.. im guessing is carbon build up? they check the codes afterwards.. only misfiring in cylinder number 2 only!!! we're almost there!
The mechanic at Honda finally figured out why my car has been misfiring and why the spark plugs are always black when he pulls it out. When he starts my car up in the cold, he noticed a strong gas smell. He said the car is not burning the gas efficiently which is leaving carbon build up throughout the emission system. He has already cleaned the emission system for me again, including ports and valve again. He suggested I drive the car hard to burn the remaining carbon build up. Is there any reason why my car is not able to burn gas the way it suppose to? Is there a way to fix this problem?
didn't charge me for the work but still can't figure out why my car is not burning the fuel the way it is suppose to. I fill up 93 octane.. should I try to fill 89 octane which is less rich to see if it will burn it more efficiently?
no. Cheap gas will just make you get spark knock. (aka pinging aka predetonation) The only thing I can figure if you car isn't combusting fuel efficiently is something ignition related. (coil, dizzy, wires, plugs, ECU) We've been through all of that already though. Maybe your primary o2 sensor is bad, causing your car to run fat. But if that were the case, you'd think there would be a code for it. I'm still stumped.
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The Japanese have a saying......"The nail that sticks out gets hammered."
The mechanic at Honda finally figured out why my car has been misfiring and why the spark plugs are always black when he pulls it out. When he starts my car up in the cold, he noticed a strong gas smell. He said the car is not burning the gas efficiently which is leaving carbon build up throughout the emission system. He has already cleaned the emission system for me again, including ports and valve again. He suggested I drive the car hard to burn the remaining carbon build up. Is there any reason why my car is not able to burn gas the way it suppose to? Is there a way to fix this problem?
What brand of plugs are you using?
For anyone reading along, you should only run NGKs in the stock heat range. Make sure they are gapped correctly also (can't remember the spec, Helms has it). Don't run Bosch +4s, those are a problem on 100% of all cars that have tried it.
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The correct plug gap for Preludes is 0.044. NGK plugs for the Prelude come pre-gapped.
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1988 Prelude S - victim of an 80mph backflip
1991 Prelude Si - sold
1989 Accord DX - impounded
1998 Prelude SH - bolt-ons dynoing @ 173whp&140tq
2006 CRF150F - sold
2006 YZ250F
I used to use NGK irdiums with NGK plugs.. when the misfiring codes first showed up, Honda suggested I only use factory plugs and wires, which I already changed. I am running on all honda factory tune up items right now which includes plugs, wires, pcv, cap, and rotor. I also changed the entire distributor unit with EGR valves and ports.
Is there anything that I missed? My check engine light came back on saturday when I was idling. However, it went off today when I started my car.... My emission inspection is due at the end of the month and I won't be able to pass with that light coming on and off as it pleases.
I used to use NGK irdiums with NGK plugs.. when the misfiring codes first showed up, Honda suggested I only use factory plugs and wires, which I already changed. I am running on all honda factory tune up items right now which includes plugs, wires, pcv, cap, and rotor. I also changed the entire distributor unit with EGR valves and ports.
Honda should be using NGK platinums. They do at my dealership. They may say Honda on them or something, but NGK makes them.
Anyway, I know this is gonna sound so rediculous, but maybe you need a new gas cap. Just the fact that you said you had a CEL and it went away on its own made me think of that. The gas cap not screwed in all the way\leaking is one of the only times you will get a CEL and it will go away after you fix the problem without you having to actually clear it. CEL's don't just go away on their own. Except that one. Maybe you burned the CEL out from it being on for so long. LOL Good Luck.
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The Japanese have a saying......"The nail that sticks out gets hammered."
Honda should be using NGK platinums. They do at my dealership. They may say Honda on them or something, but NGK makes them.
Anyway, I know this is gonna sound so rediculous, but maybe you need a new gas cap. Just the fact that you said you had a CEL and it went away on its own made me think of that. The gas cap not screwed in all the way\leaking is one of the only times you will get a CEL and it will go away after you fix the problem without you having to actually clear it. CEL's don't just go away on their own. Except that one. Maybe you burned the CEL out from it being on for so long. LOL Good Luck.
ROFL! that's what I was thinking too.. maybe the light blew out! lol but unfortunely no.. I noticed when I am standing idle, the car is fine... when it is on a uphill slant, the car will start to vibrate a bit and my check engine light would come on...
I ran seafoam and replaced my o2 sensors and i still cant get the light to go away! (full tune up has been done already) p0304 missfire in cylinder #4, im getting a valve lash on tues hopefully this will solve the problem.
I ran seafoam and replaced my o2 sensors and i still cant get the light to go away! (full tune up has been done already) p0304 missfire in cylinder #4, im getting a valve lash on tues hopefully this will solve the problem.
Are you having the same problem as I am? rough idle at uphill slant? Seems like both of us have done the same maintenance on both our cars... -_- aren't we the lucky lude owners
Same with me but i only noticed it more recently when i was stuck in traffic and i was on a uphill slant and my car started to idle roughly... The guys at Honda told me theres another guy with a Type SH that is having the same problem as us. Hope this makes u feel better LOL
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