crazyJake

Any troubleshooting advice for "cylinder 1 misfire"? The car has 80K mi.

Also my interior lights fuse keeps blowing intermittently. Any common problems here?

BLKFLSH

Try switching coils, then spark plugs to see if the misfire switches to another cylinder. Make sure the wire is not grounding out somewhere.

YeuEmMaiMai

what /\ said.........also make sure that the coil pack is getting a fire signal from the ecu

crazyJake

Thanks,
I rechecked the codes. Actually cyclinder 1-6 all had reported misfire, plus a random misfire code. Additionally, O2 sensors 1 and 2 reported errors (stuck open I believe).

Could the O2 sensors be bad causing the computer to sense a misfire?

TruckGuy

No. O2 sensors may be having a problem with the air in the exhaust due to actual misfires. Does engine run rough? If so and all 6 cyl's coding for misfires, I would get a fuel sample in a clear jar and make sure you don't have trashy fuel. I have seen alot of veh. with bad gas lately. If it really has a misfire, dont drive cause you could kill the cats.

IMALLSLO

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TruckGuy &raquo;</TD></TR><TR><TD CLASS="quote">No. O2 sensors may be having a problem with the air in the exhaust due to actual misfires. Does engine run rough? If so and all 6 cyl's coding for misfires, I would get a fuel sample in a clear jar and make sure you don't have trashy fuel. I have seen alot of veh. with bad gas lately. If it really has a misfire, dont drive cause you could kill the cats. </TD></TR></TABLE>

Check with the dealership. There is a S/B 04-042 regarding a misfire. PCM software update to correct the issue. This may not be it,but its a start.

jdmitr

This is a very common thing. If your ecu has lost the ckp crank learn "high rpm" memory then it is prone to being more sensitive on misfire detection. Let it warm up to operating temp, then put it in 1st gear and run it up to 5500 rpm with no loads and let off and coast to about 2000 rpms. The only way you can know for sure if it takes is with a Honda HDS scan tool ad look in the data list and it will show completed. I have seen this a lot and once the ckp learn is done - no more misfires... worth a try

Modified by jdmitr at 11:17 AM 1/16/2008


Modified by jdmitr at 11:18 AM 1/16/2008

HondaTechAV6

is it fuse 6 in the underdash fuse box blowing?

i second getting the software update. it may not fix it, but it's a start. they should also road test the car at this point to set the high and low cam learn procedures. if they don't it's simple enough.

but the car in D3 and drive to 2500 rpm. let the engine cost down to 1000rpm.
then put the car in D1 and drive to 5000rpm(it's ok if you go a little over) and coast down to 3000 rpm. don't use the brake pedal in both procedures.

crazyJake

OK, I got the computer reprogrammed (supposed to fix the misfire codes), and the still showed O2 sensor 1,bank 1 bad. So replaced the O2 sensor and now fixed.

I think its FU 7 that keeps blowing.....

thanks

IMALLSLO

Damn im good{pats self on back} . Glad you got it fixed. The O2's were a given. Check the interior switch itself.
How long after replacing the fuse does it blow. If its pretty frequesnt,try isolating by removing each compnent(ie.door light,dome light etc. ) and see if removing one keeps the fuse lasting longer. You may have a bad light bulb or a bad connection at a plug. Not my way of diag. but its an easy way to isolate if your not in a rush.

crazyJake

I kind of wondered if maybe the dimmer circuit could cause a fuse blow. If the dimmer was varying voltage or current, who knows what could go wrong there.....


If I knew what the circuit looked like, I could decide whether to eliminate this as a likely cause. I like the idea of popping bulbs 1 at a time to eliminate different branches of the circuit. Will try!

(No schematic! would help to have a "real" drawing, not just a block diagram!)

GeelongHondcare

Is this high and low cam learn procedure applicable to the 4cyl model as well?

fffonte

does this reset the check engine light? or do i need to do it manually?

NightHawk92

I don't like to bring up old posts but I to I'm having misfires with my Accord it started today. I noticed when I removed my plugs to do a valve adjustment the plugs looked to be fouled. black around the electrode. and brown at the tip. the dealership told me in a inspection when I took it to get the Timing Belt done. that they should be replaced. Anyway i have the Factory service manual but its difficult to diagnose because the manual mostly calls for the HDS system. I'll switch the ignition coil packs and spark plugs to see if the problem go's away. The codes where DTC 0300,301,302,303,304,305

Lost Again

Well that would be a good place to start.

Did the codes come before or after the valve lash adjustment?

NightHawk92

the codes came After the valve adjustment but the spark plugs where damaged before I took them out. And I replaced all gaskets and valve and Intake manifold gaskets bottom and top the gasket that goes between the engine manifold cover that has the 12 chrome bolts on it.

Lost Again

Try the plugs and that but if this came after the valve adjustment, you might want to re-check them.

NightHawk92

I checked the valves at least several times before I put the valve covers back on I wanted it to be Factory so I made sure the valves where perfect. I spent so much time making sure the valve adjustment was perfect I guess that's why I didn't realize the part numbers where different for the front valve cover. Part # A12310-RCA-A03 is 05 valve cover. 03 Accord EXV6 valve cover part #A12310-RCA-A02 is what I needed. or bought but was sent this A03 cover. this is biggest mistake I have made is not checking the part numbers. cant believe on how similar this valve covers are cant even tell the differences only the part numbers.

Lost Again

Again, please don't take this the wrong way but the fact the codes/issue showed up after the adjustment makes you want to go there. It isn't that hard to get the mm to inch conversion wrong. Also this should be done when the engine is stone cold or close to it......and the "feel" of a "slight drag" on the feeler is an art as well.

Replace the plugs...see what you have.

NightHawk92

Don't worry I'm not offended at all. I make a mistake on something once in awhile. I replaced the spark plugs and the engine doesn't have the codes anymore its just the old spark plugs where giving me problems. The dealership told me the plugs where going to have to be replaced soon. when I had the Timing belt done. that was last year in October 2012. its just after I did the valve Adjustment I put the old spark plugs back in when I should have replaced them. At that time when I had them out.

NightHawk92

that's what was giving those misfire codes and causing problems was the old spark plugs. just needed to be replaced. Those where the Honda NGK iridium plugs they only had maybe 40,000 miles on them so that's very little compared to 105,000 miles. that's how long there supposed to last. but that was before I did the valve adjustment plugs looked like crap when I took them out. I don't know I'm just trying to keep the car as new as possible since its been that way for Ten years. what can I say I just love this car the engineering and detail and all the features. Anyway thank you for all the great Information and troubleshooting questions I have.