Clogged fuel filter? Weak fuel pump? Sounds like a "not enough fuel getting to the engine" issue. The gravity is fighting against the flow of the fuel. I suppose it could still be a bad gas cap, as the fuel pump would be sucking air with the fuel. I'd (re-) start with a new gas cap fo' sho'. FO' SHO'!!!!!!!! And a fuel filter. Those are both pretty cheap.
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The Japanese have a saying......"The nail that sticks out gets hammered."
Clogged fuel filter? Weak fuel pump? Sounds like a "not enough fuel getting to the engine" issue. The gravity is fighting against the flow of the fuel. I suppose it could still be a bad gas cap, as the fuel pump would be sucking air with the fuel. I'd (re-) start with a new gas cap fo' sho'. FO' SHO'!!!!!!!! And a fuel filter. Those are both pretty cheap.
Changed the fuel filter already and gas cap is on the way...
full tune.... spark plugs, wires, cap and rotor, both o2 sensor, fuel filter, pvc valve, i got a valve lash adjustment, checked fuel injectors, ran sea foam, and did an oil change. My next move will be to get a compression test and like i said im expecting the worse!! this sucks the car only has 103k miles
Changed the fuel filter already and gas cap is on the way...
Nice. Let us know if that's it. Like I said, I kinda doubt it, but at this point, you've already tried nearly everything else, so it can't really hurt. Just the fact that your CEL went away on it's own made me think it could be a gas cap issue. Also I think somebody told Speck on PreludePower that they had a cracked vacuum cap on the throttle body that was barely visible (the crack) but let in just enough air to have a vacuum leak and cause a misfire.
Also Speck, have you done the EGR port cleaning yet? It is alot easier to do than the write-up makes it sound. Once you get into it, it's a piece of cake.
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The Japanese have a saying......"The nail that sticks out gets hammered."
well i spent about an hour and a half looking for any possible air leaks and also removed egr valve to clean. It was really dirty but for some reason i think my idle got worse after i cleaned the egr??
well i spent about an hour and a half looking for any possible air leaks and also removed egr valve to clean. It was really dirty but for some reason i think my idle got worse after i cleaned the egr??
You have to remove the EGR port plugs and clean the ports themselves. I had cleaned my EGR valve multiple times with no change. Then I cleaned the EGR ports, and no more CEL. My code was for a P0301 (cylinder 1 random misfire) And yeah, the car will idle a little rough at first until all the carb cleaner or whatever you used to clean the EGR gets burned off. Maybe 10-15 minutes. EGR port cleaning
That's a pretty good write-up on how to do it, except that instead of using a modified shop vac, I used compressed air and a blower nozzle. And instead of a gun cleaning kit, I got a set of like 10 nylon-bristled brushes from my local tool store for like $5. If you are going to use compressed air to clean the ports, cover your fenders with a towel so that you don't get the carb cleaner and carbon all over the paint. Also, I don't think it is totally necessary to punch a divot in the plug before drilling into them. They are paper thin and drill very easily as long as your bit is pretty sharp. Just be sure to put grease on the bit to catch any metal shavings. Here's all you need:
Nylon-bristled brushes--$5
1 or 2 cans of carb cleaner\brake cleaner\carbon remover--$4-8
Cheapo slide hammer ( get the cheapest one you can find, like a 2 lb. hammer or whatever. It doesn't take much force to pop those plugs out.)--$5-10
EGR Port plugs from honda there are 6 of them--$3.60 ish for 6
Blow gun for air compressor--$3
So you can see that you can do it for about $20-30 and even cheaper if you know somebody that owns a slide hammer, like I did. Good luck. Hope this helps. And sorry for the mini-threadjack, ItzRoyal.
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The Japanese have a saying......"The nail that sticks out gets hammered."
i had the same problem for almost a year. same codes and rough idle sometimes.
the cause:
i had accually sucked water in the intake from a large puddle and hydro locked the motor. i spent a hole day pumping water out the cylinders. when i finally got it to run i had a bad cylinder but ater a few days of driving it like that it kinda clered up. (my prelude is the self healing kind)lol. compression check showed one of the cyilders running 30 psi lower than the rest. a leakdown test showed a small leak through an exhaust valve. so i still drove it cause the idle wasnt too bad. kinda felt like i had a cam.
fix:
well i had done many oil changes on this car and because of the mileage 130k i alway used 10w30. and its staring to get hot down here in the desert. so i decided to try a thicker oil, 20w50. and once i started the engine i immeditely noticed the engine was running smoother. i drove it for 2 days and the light went out. 2 weeks later the light hasnt come on. everyonce in a while i get a little rough idle but not as bad as it was.
ok so after cleaning the egr valve (a lot of carbon build up!) and sparying some cleaner down into the manifold and driving the car one whole day idleing is smoother and back to normal best of all no CEL! well at least it hasnt came back on. I just ordered the egr port plugs and will clean the ports once they come in, this might be the solution
ok so after cleaning the egr valve (a lot of carbon build up!) and sparying some cleaner down into the manifold and driving the car one whole day idleing is smoother and back to normal best of all no CEL! well at least it hasnt came back on. I just ordered the egr port plugs and will clean the ports once they come in, this might be the solution
I've done all that... =T
Still came on for me... hope it works out for the better for you... I did just change my gas cap tho and driven it for about 3 days now.... about 60 miles combine and so far so good...
So it looks like I may have been right on both cars. (knock on wood) I will sh*t if I helped both of you guys fix your CEL's. Not so much with Speck, because I'm pretty sure that is the EGR ports judging by the fact that spraying cleaner into the IM helped. But ItzRoyal's car has had me stumped for months, and if your code is gone, I'm gonna be happy. And think of it this way, even though you guys have done all that work on your cars, you needed all that stuff eventually anyway. Good luck guys and LMK the outcomes.
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The Japanese have a saying......"The nail that sticks out gets hammered."
yea well my light came back on! im still waiting on the plugs to get here so i can clean the ports. Ill also be changing my gas cap since is pretty cheap
my CEL came back on too.. and yes is OEM gas cap... everything i've changed so far has all been OEM items. Fuel pump will be next... what kind of fuel pump would you recommend
?
my CEL came back on too.. and yes is OEM gas cap... everything i've changed so far has all been OEM items. Fuel pump will be next... what kind of fuel pump would you recommend
?
Damnit, ItzRoyal. You had me all excited. Back to square one. Have you checked the fuel pressure? How many psi is it at? Your fuel pressure regulator could be bad, although I've never heard of one crapping out. On the other hand, I've never seen a misfire as elusive as yours.
And Speck, the CEL will keep coming on until you thouroughly clean those ports. The fact that it stayed off for a little while after you sprayed cleaner in the IM is kinda promising though. Make sure you clean them very well, so you don't have to do it twice.
I'm getting frustrated trying to help you figure this out, ItzRoyal. You must be pulling your hair out by this point.
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The Japanese have a saying......"The nail that sticks out gets hammered."
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