2004 with 180k. I recently had the check engine light on, after getting it hooked up to the computer it read out cylinder misfire 1-4. I replaced the coils, and the plugs. Reset light and after 54 miles light came back on. Now reading codes P0300, and P0301.

Fuel injectors? Valve adjustment? Any help would be appreciated, the inspection is due at the end of the month, and I need the light off to pass, not to mention, I need better gas mileage.

have you had any work done in the 180k miles...have you done your regular scheduled maintenance...if so what have you done....you where asking about a valve adjustment...it should have been done at 110k...

I never got the valve adjustment. Only oil, transmission fluid flush and filled, pads, tires, rotors, coil packs, plugs, and filters.

I never got the valve adjustment. Only oil, transmission fluid flush and filled, pads, tires, rotors, coil packs, plugs, and filters.

here are your codes.p0300..random/multiple cylinder misfire.
p0301..cylinder 1 misfire..

Sorry I guess I should have mentioned that I have the codes, and the descriptions. I am trying not to go on a wild chase. Was just wondering if anyone could suggest what they may try next. Thanks again for the help!

Sorry I guess I should have mentioned that I have the codes, and the descriptions. I am trying not to go on a wild chase. Was just wondering if anyone could suggest what they may try next. Thanks again for the help!

Except for the light. Are you experiencing any issues like rough start. Or stalling poor acceleration

Usually when the car first starts after sitting either overnight or all day at work I notice it idles around 7500-8000 RPM, (I'm not sure what the norm is) Usually when I pull out of the driveway or office complex and come to my first stop, the car gets VERY sluggish, and on occasion has actually stalled.

My regular mechanic had suggested after the packs, and plugs were swapped out that there may be a fuel issue. I have recently added Techron additive to see if that would help with any water or to help clean the injectors.

Usually when the car first starts after sitting either overnight or all day at work I notice it idles around 7500-8000 RPM, (I'm not sure what the norm is) Usually when I pull out of the driveway or office complex and come to my first stop, the car gets VERY sluggish, and on occasion has actually stalled.

My regular mechanic had suggested after the packs, and plugs were swapped out that there may be a fuel issue. I have recently added Techron additive to see if that would help with any water or to help clean the injectors.

I am also thinking a fuel issue. Bad injector. However I don't want to see you keep wasting money by changing parts that don't need to be changed. That will get expensive and may not fix the problem. Is this a mechanic you know and trust well????if not may I suggest you ask around And find another mechanic that will do a proper diagnosis. and save you from wasting your money on parts you dont need.

It can also be something as simple as a throttle body cleaning that you can do your self. Search the stickys on throttle body cleaning. A dirty throttle body will definitely cause the issues your having

Thanks for the suggestions. I am thinking I have to bring this to the dealer at this point.

Techron in addition to being used in Chevron fuels and sold to other oil companies for their fuels, has two concentrations of Techron for sale to consumers. One is added every 3,000-5,000 miles. The other is a concentrate used for quick cleaning of carbon build-up on valves, pistons, injectors, so hopefully this solves your problem.

I suggest you change the oil after use as it loosens up the carbon deposits some of which ends up in the oil as does some of the solvents in the concentrate. The concentrate should be used just prior to changing the oil - typically for one full tank of fuel.

The non-concentrate can be added periodically without requiring an oil change as it's a lower concentration of solvents. See the Techron container for specific use directions.

i'm having the same issues as well :?

i was thinking that the coils were bad, but it idles perfectly fine at park or neutral. it can't be the iacv or throttle body, since it should stall out even not in gear.

Maybe this will help:

http://www.elementownersclub.com/forums/showthread.php?t=61874&highlight=misfires

Your E idles at 7500-8000 RPM? I hope you mean 750-800 which is normal after a cold start-up idle of 1500 for about a minute.

when the engine is cold, or when its warming up, it will idle at 750-800 perfectly fine. however, when it gets hot, then it'll idle between 500-550 RPM. sometimes it even stalls out...

I cleaned the throttle body and had the compression tested. Same result. Car idles very low at start up, either cold or warm weather. It stalled this morning after coming to the first stop about a mile from my house. Once I get on the highway the car rides fine. Do you think its the carbon build up on the valves? I need to change the oil this weekend and can try the Techron again. Any suggestions as far as changing the fule injectors? Check engine light is still present.

On my old accord I had similar symptoms..
What I did was swapped the distributors between the one that you know is okay and one that code gives you as faulty and see if it throws the same code afterwards.
If it does you know it's not the distributors since code should be a bit different now that defective one is in different place.

Another cause of a misfire can be an exhaust leak. This sounds counter-intuitive however you have to realize the the engine requires a proper exhaust system to work properly. Also, as we have 4 cylinder engines, the PCM will use the first O2 sensor to measure the exhaust coming from the engine. As only one cylinder is firing, and the PCM knows this via crank/cam sensors, it knows how each cylinder is performing and adjusts accordingly.

So, that being said, if you have an exhaust leak, and the O2 sensor is not seeing a valid reading, and in conjunction with other, possible, qualifying conditions, it may throw a misfire code.

I know this from experience on our Suzuki. I tried everything in the book that i could do before going to the dealer as the Suzuki dealer is way far away and expensive. I then read about someone else having a misfire condition, actually this may have been on the Honda-Tech Forums, and they said it was a leak in the exhaust system. Since there was a leak, and maybe something to do with the length of the exhaust manifold runners not being equal for each cylinder as they make their way to the first cat, only one cylinder has a misfire. He swapped coil packs, he swapped plugs, changed oil, injector clean, etc.

Exhaust leak.

So, if you can, start the engine and see if you can feel any exhaust coming out from the pipes where they join up. At 180K you might be in need of a new gasket, etc., depending on your weather conditions.

Get your valves adjusted..The exhaust valves are known for becoming tight and causing problems.. And your way overdue.

Valve adjustment it is! This worked,and the car is running better than ever!