over-revved, runs poorly, diagnostics
#1
over-revved, runs poorly, diagnostics
Hey friends, I have an 04 accord ex coupe, v6 motor. recently 4 weeks ago I did the valve adjustment-- she ran fine afterward, no noise, etc. I put in new ngk iridium plugs, all effected top end gaskets, oil and filter (always mobil 1, 5w-20)..
upon Thanksgiving highway travel, I was getting off at an exit and mis shifted (over revving the **** out of the motor for about 2 seconds before I caught it and corrected) now i'm getting seemingly valve chatter and TERRIBLE puttering at idle. (like its fighting for correct air/fuel)
checked the plugs, look new still, compression varied 1 0r 2 pounds, but overall 145 psi across all cyl's (book calls for 135 min, max var. 28 psi)
then I was trying to convince myself it was affected by crappy gas, so I added Lucas injector cleaner, Heet water remover, and for ***** and giggles dumped in a few ounces of Lucas oil additive (to hopefully quiet the lifters?)
for more kicks and giggles I tried doing the ckp relearn procedure as outlined by honda, the CEL went away for a mile or two then came back, the symptoms persisted throughout though
at idle it "hunts" as i call it- kind of gurgling like a alcohol motor.. if i slowly increase rpm's to about 3k then let off immediately the bottom end falls out and then eventually tries to regain, gurgling once more
my worst fear is that I briefly floated the valves-- I hear constantly this is a huge occurence in the j30a4 m/t cars. but wouldn't this suggest a lower compression reading?
should I continue checking tps, map, o2, and iat, etc sensors? or am I spinning my wheels to the inevitable valve cover pull and valve inspection?
any help would be very appreciated!!
upon Thanksgiving highway travel, I was getting off at an exit and mis shifted (over revving the **** out of the motor for about 2 seconds before I caught it and corrected) now i'm getting seemingly valve chatter and TERRIBLE puttering at idle. (like its fighting for correct air/fuel)
checked the plugs, look new still, compression varied 1 0r 2 pounds, but overall 145 psi across all cyl's (book calls for 135 min, max var. 28 psi)
then I was trying to convince myself it was affected by crappy gas, so I added Lucas injector cleaner, Heet water remover, and for ***** and giggles dumped in a few ounces of Lucas oil additive (to hopefully quiet the lifters?)
for more kicks and giggles I tried doing the ckp relearn procedure as outlined by honda, the CEL went away for a mile or two then came back, the symptoms persisted throughout though
at idle it "hunts" as i call it- kind of gurgling like a alcohol motor.. if i slowly increase rpm's to about 3k then let off immediately the bottom end falls out and then eventually tries to regain, gurgling once more
my worst fear is that I briefly floated the valves-- I hear constantly this is a huge occurence in the j30a4 m/t cars. but wouldn't this suggest a lower compression reading?
should I continue checking tps, map, o2, and iat, etc sensors? or am I spinning my wheels to the inevitable valve cover pull and valve inspection?
any help would be very appreciated!!
#2
Re: over-revved, runs poorly, diagnostics
You might want to do a leak down test. I am wondering if you spun a bearing.
Do not dump more parts into it, until you test.
And you did the compression, followed all procedures? I would do it again. Over revving is bad news.
Do not dump more parts into it, until you test.
And you did the compression, followed all procedures? I would do it again. Over revving is bad news.
#3
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Re: over-revved, runs poorly, diagnostics
Your's is an "interference" engine, meaning one or more pistons will strike and bend open valves if you signficantly over-rev the engine. $$
#4
Honda-Tech Member
Re: over-revved, runs poorly, diagnostics
but if he bent valves he'd lose compression in the cyl with bent valves
do a leakdown, double check compression and follow the instructions, check oil for oil shavings, check vacume lines(spray carb cleaner at vac lines) idle surging can be caused by a vac leak....and double check that you dont have hairline cracks in the porciline of the plugs
do a leakdown, double check compression and follow the instructions, check oil for oil shavings, check vacume lines(spray carb cleaner at vac lines) idle surging can be caused by a vac leak....and double check that you dont have hairline cracks in the porciline of the plugs
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Re: over-revved, runs poorly, diagnostics
Hey friends, I have an 04 accord ex coupe, v6 motor. recently 4 weeks ago I did the valve adjustment-- she ran fine afterward, no noise, etc. I put in new ngk iridium plugs, all effected top end gaskets, oil and filter (always mobil 1, 5w-20)..
upon Thanksgiving highway travel, I was getting off at an exit and mis shifted (over revving the **** out of the motor for about 2 seconds before I caught it and corrected) now i'm getting seemingly valve chatter and TERRIBLE puttering at idle. (like its fighting for correct air/fuel)
checked the plugs, look new still, compression varied 1 0r 2 pounds, but overall 145 psi across all cyl's (book calls for 135 min, max var. 28 psi)
then I was trying to convince myself it was affected by crappy gas, so I added Lucas injector cleaner, Heet water remover, and for ***** and giggles dumped in a few ounces of Lucas oil additive (to hopefully quiet the lifters?)
for more kicks and giggles I tried doing the ckp relearn procedure as outlined by honda, the CEL went away for a mile or two then came back, the symptoms persisted throughout though
at idle it "hunts" as i call it- kind of gurgling like a alcohol motor.. if i slowly increase rpm's to about 3k then let off immediately the bottom end falls out and then eventually tries to regain, gurgling once more
my worst fear is that I briefly floated the valves-- I hear constantly this is a huge occurence in the j30a4 m/t cars. but wouldn't this suggest a lower compression reading?
should I continue checking tps, map, o2, and iat, etc sensors? or am I spinning my wheels to the inevitable valve cover pull and valve inspection?
any help would be very appreciated!!
upon Thanksgiving highway travel, I was getting off at an exit and mis shifted (over revving the **** out of the motor for about 2 seconds before I caught it and corrected) now i'm getting seemingly valve chatter and TERRIBLE puttering at idle. (like its fighting for correct air/fuel)
checked the plugs, look new still, compression varied 1 0r 2 pounds, but overall 145 psi across all cyl's (book calls for 135 min, max var. 28 psi)
then I was trying to convince myself it was affected by crappy gas, so I added Lucas injector cleaner, Heet water remover, and for ***** and giggles dumped in a few ounces of Lucas oil additive (to hopefully quiet the lifters?)
for more kicks and giggles I tried doing the ckp relearn procedure as outlined by honda, the CEL went away for a mile or two then came back, the symptoms persisted throughout though
at idle it "hunts" as i call it- kind of gurgling like a alcohol motor.. if i slowly increase rpm's to about 3k then let off immediately the bottom end falls out and then eventually tries to regain, gurgling once more
my worst fear is that I briefly floated the valves-- I hear constantly this is a huge occurence in the j30a4 m/t cars. but wouldn't this suggest a lower compression reading?
should I continue checking tps, map, o2, and iat, etc sensors? or am I spinning my wheels to the inevitable valve cover pull and valve inspection?
any help would be very appreciated!!
#16
Re: over-revved, runs poorly, diagnostics
To check if you got an engine/compression problem. get a simple vacuum gauge and the reading should be between 18-21" Hg with a steady needle. Check at idle and also at 2000 rpms.
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