02 civic misfire, rough idle
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02 civic 266K, rough idle been getting worse over time.
i have done a bunch to try and find the issue but im stumped, this is an LX so it does not have an EGR valve.
what i have done so far; took the throttle body off cleaned it throughly, did idle relearn, changed spark plugs, changed out coil packs, since i have been getting p0301 (cyl1 misfire) lastnight i took fuel injector 1 and swapped it to cyl #2, no difference.
i dont think the cat is clogged, wouldn't it smell like rotten eggs?
friday night ill be tearing out the intake manifold and see if the EGR ports are clogged. after that im stumped, any insight would be great
thanks
i have done a bunch to try and find the issue but im stumped, this is an LX so it does not have an EGR valve.
what i have done so far; took the throttle body off cleaned it throughly, did idle relearn, changed spark plugs, changed out coil packs, since i have been getting p0301 (cyl1 misfire) lastnight i took fuel injector 1 and swapped it to cyl #2, no difference.
i dont think the cat is clogged, wouldn't it smell like rotten eggs?
friday night ill be tearing out the intake manifold and see if the EGR ports are clogged. after that im stumped, any insight would be great
thanks
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one thing i forgot to add, when im highway driving there is little notice of a misfire and the CEL is not blinking.
once i get off the highway and stop at a stop light the idle is rough and the p0301 misfire occurs, i put the e brake on and rev the engine up to 2000 RPM and the misfire stops
once i get off the highway and stop at a stop light the idle is rough and the p0301 misfire occurs, i put the e brake on and rev the engine up to 2000 RPM and the misfire stops
#3
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Re: 02 civic misfire, rough idle
Do a real compression test before anything else.
The EGR passage misfire will not occur at idle so don't waste time tearing the manifold off yet.
The EGR passage misfire will not occur at idle so don't waste time tearing the manifold off yet.
#4
Re: 02 civic misfire, rough idle
Ezone hit it with the compression test suggestion. Maybe you have sticking/burnt valve(s).
Try it before going further. It doesn't matter if you think the misfire goes away at higher RPM.
Try it before going further. It doesn't matter if you think the misfire goes away at higher RPM.
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When I sta rted troubleshooting I did s comp test on cyl 1 where the mis fires were coming from. I got 140 psi on that cylinder. I'll b doing another tonight after work and post back.
#6
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Re: 02 civic misfire, rough idle
You must test compression on all 4 cylinders.
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well ......looks like the civic is just about dead
compression test lastnight:
cyl1 - 0psi
cyl2 - 80psi
cyl3 - 84psi
cyl4 - 100psi
i dont feel like tearing off the top end and re doing it, i dont know. its going to need another clutch soon, timing belt, rings, valve job, valve seals, head gasket, water pump, tensioner. probibly crank seals too
compression test lastnight:
cyl1 - 0psi
cyl2 - 80psi
cyl3 - 84psi
cyl4 - 100psi
i dont feel like tearing off the top end and re doing it, i dont know. its going to need another clutch soon, timing belt, rings, valve job, valve seals, head gasket, water pump, tensioner. probibly crank seals too
#8
If you think a good mechanic is expensive, try hiring a bad one
Re: 02 civic misfire, rough idle
i dont feel like tearing off the top end and re doing it, i dont know. its going to need another clutch soon, timing belt, rings, valve job, valve seals, head gasket, water pump, tensioner. probibly crank seals too
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not sure how/why we got 140 on the first test , but dad and i did this one 3 times last night cus i couldn't believe my civic is almost dead.
i even put my hand over cyl1 and didnt feel a puff as i was out of 2-3-4.
unfortunately i have to drive the car to work and to clients, just praying i dont throw a rod till i find something else.
i even put my hand over cyl1 and didnt feel a puff as i was out of 2-3-4.
unfortunately i have to drive the car to work and to clients, just praying i dont throw a rod till i find something else.
#10
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Re: 02 civic misfire, rough idle
Since Hondas tend to tighten up the valves--- see if the valves are tight on #1. Check all of them.
MAYBE, just maybe, it hasn't burned a valve yet..... but don't hold your breath.
MAYBE, just maybe, it hasn't burned a valve yet..... but don't hold your breath.
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Rep Power: 130 Re: 02 civic misfire, rough idle
Odd how, if the valves are indeed tight... that the tightness is progressively better away from #1.
If anything, the exhaust valves with be the ones that are tight... and those are certainly valves you do not want hovering free over the valve seat (valves stay cool by transferring their heat to the head through contact with the seat).
Rocker arm valvetrains however, tend to get looser as they approach op temp -- so there is the slight chance (very slight) that your valves just need adjusting, as the D17 rockers are much, much larger than the B- or K-series rockers (which are more followers than conventional rockers). Good luck!
If anything, the exhaust valves with be the ones that are tight... and those are certainly valves you do not want hovering free over the valve seat (valves stay cool by transferring their heat to the head through contact with the seat).
Rocker arm valvetrains however, tend to get looser as they approach op temp -- so there is the slight chance (very slight) that your valves just need adjusting, as the D17 rockers are much, much larger than the B- or K-series rockers (which are more followers than conventional rockers). Good luck!
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thanks guys, ill try a valve adjustment this weekend.
if i do have to do a rehaul can i leave the block in the car and just pull the top out? or is it easier to pull the full motor
thanks
if i do have to do a rehaul can i leave the block in the car and just pull the top out? or is it easier to pull the full motor
thanks
#13
If you think a good mechanic is expensive, try hiring a bad one
Re: 02 civic misfire, rough idle
Don't look in my bay right now though. I have an entire Odyssey drivetrain on the ground because I thought it would be faster to get the heads off of it this way.
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