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#1 cylinder misfire

 
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Old 05-06-2010, 10:41 PM
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#1 cylinder misfire

ok when i bought my car (98 prelude) two months ago i bought it with a check engine light the dealer that sold it to me gave me a free diagnostics and the only thing it said was 02 sensor 1 bank 1, so last Friday i bought a new sensor went to my bros shop, lifted the car and found out the sensor was not plugged in all the way.. all we did was plug it in reseted the computer and done.! the next day and from then to now the car started acting off, sometimes it idles @ 500rpm causing rough idle and sometimes when i give it gas it bogs for about 3-4 seconds and suddenly a burst of power comes out and picks up.. check engine showed up again yesterday and this is what i got:

code-P1399
random cylinder misfire detected probable cause
aa1-blocked EGR passage
aa2-valve clearence out of range

code-P0301
cylinder number 1 misfire probable cause
aa1-vacuum leak affecting one cylinder
aa2-ignition system concern
aa3-blocked/faulty fuel injector
aa4-engine mechanical condition

code-P0171
fuel system too lean bank 1(Cylinder number 1 denotes bank 1) probable cause
aa1-large vacuum leak
aa2-fuel system concern
aa3-ignition system concern
aa4-MAF sensor faulty
aa5-HO2S/AF ratio sensor fault

before i we plugged the o2 sensor in and reseted the computer it ran perfect why is it doing this now.? what might be the problem thats causing all this.?
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Old 05-07-2010, 12:47 AM
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Re: #1 cylinder misfire

how many miles does it have? that's the same problem that i had...does it burn any oil? and about the misfire check your spark plugs to see if they have any carbon build up...
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Old 05-07-2010, 12:57 AM
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Re: #1 cylinder misfire

you might be leaking oil over the #1 plug
also check the seal around the distributor for oil leakes
check the inside of the distributor cap
also valve clearence
if that fails compression test the cylinder
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Old 05-07-2010, 12:14 PM
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Re: #1 cylinder misfire

i dont think its anything mechanically wrong like wrong valve clearance or bad compression because the engine ran perfect before we did whats stated.. oh also we did the oil change and added some engine pep from the honda dealer.. idk maybe that helps
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Old 05-07-2010, 12:25 PM
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Re: #1 cylinder misfire

Quote:
Originally Posted by mparada324 View Post
how many miles does it have? that's the same problem that i had...does it burn any oil? and about the misfire check your spark plugs to see if they have any carbon build up...
it has 189,786 miles, no it doesn't burn oil at all.. il check the plugs and post the results
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Old 05-07-2010, 12:27 PM
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Re: #1 cylinder misfire

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Originally Posted by bluesteel View Post
you might be leaking oil over the #1 plug
also check the seal around the distributor for oil leakes
check the inside of the distributor cap
also valve clearence
if that fails compression test the cylinder
but if it was a igniton problem why is it running lean in cylinder 1 only.?
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Old 05-07-2010, 03:48 PM
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Re: #1 cylinder misfire

change the o2 senors with the new one and see if it changes, might be a bad sensor, check for vacume leaks
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Old 05-07-2010, 04:21 PM
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Re: #1 cylinder misfire

Cud either be your spark plug or spark plug wire... wen u put on the spark plug u gotta hear/feel it click in place... and is your spark plugs spaced right.. thats the only 2 things i cud think of.. wen that happen to me, i replaced the plug and wire and it started workin perfectly again
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Old 05-07-2010, 06:27 PM
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Re: #1 cylinder misfire

Quote:
before i we plugged the o2 sensor in
Did you fawk up the 02 sensor when you had it out? That would be my guess.
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Old 05-07-2010, 08:51 PM
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Re: #1 cylinder misfire

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Originally Posted by JDMPrelude23 View Post
Cud either be your spark plug or spark plug wire... wen u put on the spark plug u gotta hear/feel it click in place... and is your spark plugs spaced right.. thats the only 2 things i cud think of.. wen that happen to me, i replaced the plug and wire and it started workin perfectly again
i dont think its getting bad spark because its running lean, its either to much air or not enough fuel.. correct me if im wrong, either way im doing the tune up hopefully that gets me somewhere
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Old 05-07-2010, 08:53 PM
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Re: #1 cylinder misfire

Quote:
Originally Posted by codye3m View Post
change the o2 senors with the new one and see if it changes, might be a bad sensor, check for vacume leaks
well i can try it but its not throwing a code for the o2 sensor.. is there a way it can trick the computer that its functioning correctly.?
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Old 05-07-2010, 08:55 PM
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Re: #1 cylinder misfire

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Originally Posted by dbd6604 View Post
Did you fawk up the 02 sensor when you had it out? That would be my guess.
no i didnt touch it i was going to unplug it first then unscrew but i noticed it wasnt pluged right before i got the chance..
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Old 05-07-2010, 08:57 PM
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Re: #1 cylinder misfire

is there a sensor that controls the idle that my have damaged or maybe dirty.?
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Old 05-07-2010, 09:09 PM
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Re: #1 cylinder misfire

I HIGHLY doubt it's an idle problem dude. Actually I'm positive.
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Old 05-10-2010, 10:41 AM
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Re: #1 cylinder misfire

i think codye3m MIGHT be right i think that o2 sensor may be bad because i disconnected it yesterday and it runs 10x better idle and bog issue is gone.. but whats weird is it never gave a check engine for the 02 while the sensor was plugged.. the cylinder 1 lean mixture and random misfire is gone but number cylinder misfire is still present im guessing i need to buy a brand new o2 sensor and reset the computer for that to go away.?
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Old 05-10-2010, 12:36 PM
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Re: #1 cylinder misfire

Quote:
Originally Posted by bluesteel View Post
you might be leaking oil over the #1 plug
also check the seal around the distributor for oil leakes
check the inside of the distributor cap
also valve clearence
if that fails compression test the cylinder
Yeah you might want to replace the valve cover gasket set this will include your spark plug gromlets.

Quote:
Originally Posted by DEFTONES View Post
it has 189,786 miles, no it doesn't burn oil at all.. il check the plugs and post the results
I doubt this, get it up on vtec I bet you see smoke, maybe not much but its there.

Quote:
Originally Posted by DEFTONES View Post
but if it was a igniton problem why is it running lean in cylinder 1 only.?
Did you unplug your battery for a couple seconds after you plugged the O2 sensor back in, your ECU might need a reboot.

Quote:
Originally Posted by DEFTONES View Post
i think codye3m MIGHT be right i think that o2 sensor may be bad because i disconnected it yesterday and it runs 10x better idle and bog issue is gone.. but whats weird is it never gave a check engine for the 02 while the sensor was plugged.. the cylinder 1 lean mixture and random misfire is gone but number cylinder misfire is still present im guessing i need to buy a brand new o2 sensor and reset the computer for that to go away.?
Try the battery first and reset your cars computer, if it still acts the same denso OE are not that bad, $120 will replace both of them.
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Old 05-20-2010, 03:31 PM
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Re: #1 cylinder misfire

Clean your EGR valve and EGR ports out.
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