Skip the auto shop - Our mechanics make house calls

Q: Random misfire cont.

asked by on

Thanks for the reply Rocco, and I apologize to had forgot to mention that I had replaced the spark plugs, and the coil packs not too long ago and also diagnosed them to see if they were good or bad by unplugging one by one and got a change of idle with every one I unplugged. I had bought new O2 sensors as well, put in a new main relay, new FPR, new fuel pump, I've put in water remover along with injector cleaner in the tank. I couldn't include the parts in the last post since I ran out of space to include it, but yea I did replace a number of things to narrow it down to that. I'm in Philadelphia and there are a lot of people who own this kind of Honda, yet don't have this issue. I guess I'm the one who got lucky with the car that likes attention.

My car has 160000 miles.
My car has an automatic transmission.

A: It definitely appears that this may be an i...

It definitely appears that this may be an issue that needs some special attention. While at first it can seem that all Honda cars are the same, every once in a while you come across one that gives symptoms that are out of the norm. I can see that you have been trying to tackle this concern for a while now and replacing all of those parts is good regardless of the problem it is experiencing. It is definitely a good investment since the parts you replaced are wear items and your car is high mileage.

I have worked with Honda’s for a long time and while some concerns can be diagnosed with a few questions, there are a few situations that need the experience of an in person inspection. I do have a few questions that may help us head in the right direction though. Does the misfire only happen while you are accelerating? Is it consistent or intermittent? If so, a transmission concern can definitely make it feel like the vehicle is misfiring, so it is important to be aware of that. Also, is there a Check Engine Light on while this is happening? If so, what are the codes? When you replaced the spark plugs, which plugs did you use? Were you careful to not over tighten them? Did you use anti seize on the spark plugs and if you did, be sure you used a very small amount.

A bad fuel injector or even a problem with the valve train can also repeat what you are experiencing. Also, be sure to double check all of your ground straps. Disconnect, sand both the ground strap and the bare metal that it is attached to, and reinstall. Honda’s tend to do weird things when the ground straps do not have a solid connection, due to corrosion build up. All in all though, with a situation like this, it is difficult to diagnose your Accord without physically seeing it, and more importantly, driving the car to experience the concern.

It is best to have a certified mechanic stop by in person and go over your car from bumper to bumper to best diagnose the misfire.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Replaced a ruined cylinder head with a used cylinder head

From what you've described, it sounds like you have not put the camshafts in the correct positions. You need to use special tools to hold the camshafts in the correct position before tightening the cam gear. Once the first one...

Q: Why won't my car start up?

Hello, thank you for writing in. If the vehicle is cranking over, as in the starter is turning over the eninge (but it fails to start) then you are looking at a fuel or spark issue. If you are testing...

Q: Dashboard lights not staying on

This is a problem generally caused by a loose solder joint on pin 1 of the left most instrument cluster connector on the instrument cluster processing board. Sometimes this solder joint can be fixed but other times a new processing...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...