My 2007 Fit has an intermittent idle misfire or burp. I took the car to Honda and they couldn't duplicate the misfire and ran an engine diagnostic which came back normal. During acceleration the engine doesn't misfire at all.

Could this misfire be caused by a coil problem? Any ideas what could be the issue? Has anyone else had this issue?

This has been going on for a year or more and I'm concerned that it might get worse. My son was involved in an accident in my old 2000 Accord Coupe and I bought my wife a new CRV EX and my son has inherited the Fit to go to college.


Thanks in advance,

 

I had what you described only i noticed it when driving and idling. Would go away for weeks only to return again. It was coil pack. Though when i removed the old ones they tested identical to the new with an ohm meter.

Good Luck.

 

Here's the real question. If I take the car to the dealer he will want to replace all of the coil packs when obviously only one must be bad. The dealer wanted $400 to replace all four. Is that expensive or about right?

Also, my car only misfires at idle.

 

$400 is not a bad price for dealer work. Even the discount Honda dealers charge ~$75 ea for coils (list price is ~$100 each).

But, why not replace the coils with aftermarket Hitachi coils (part # ending in 053)? Cheaper $$ for OEM quality. These are only ~$48 ea from Rock Auto.

If your '07 really has 65K miles on it, some time-based maintenance such as a valve lash adjustment would be beneficial. Also, new Iridium plugs.


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A shop or dealer would be inclined to replace ALL the coils...theory being, if one is bad now, the rest cannot be far behind. You would be angry if the symptom re appeared in a few months, wouldn't you?

A last thought: coil and plug replacement is Easy-Peasy...one connector and bolt per coil. Time to let the lad experience some dirt under his fingernails, perhaps? LOL

 

Yes, the car has 65,000 miles and I have religiously followed the maintenance minder having the service done by the dealer. Also, I thought the plugs were good for 100,000 miles. Why replace the plugs with Iridium ones?

 

You're right the plugs are fine to 100k miles. And the original OEM plugs are iridium anyway.

 

I bought a couple coil packs off Amazon which were the IC00053 Beck /Arnley for $60 CDN each shipping included. Swap took all of 20mins and I removed every coil to visually inspect and ohm test. In the end I replaced cylinder 1 and 2 hoping for the best, issues stopped. It's a cheap test. Put it in cylinder 1 and keep moving it till the issue goes away... or doesn't.

 

You need to remember that the MM is a MILEAGE based system, not TIME.

Yes, the MM code for plugs comes up @ ~110K. But on low annual-mileage cars, you need to change them more often. (Assumes more short trips/warm-up periods)

On our '07 Fit at 112K miles, two of the OEM Iridium plugs were in spec, two were wider (which could result in misfires, especially during warm up).


Our '06 CR-V's plugs were all in spec when measured @ 125K miles. I replaced them anyway.

My wife's minivan (not a Honda) develops a noticeable cold misfire at around 60K miles so I replace/regap the plugs then. The factory interval on that vehicle is 100K miles for plugs also.

These are just more data points. As they say, YYMV. (Your Mileage May Vary)


Look at it this way: air filters last different amounts of time/mileage depending on the surroundings. They STILL have a 30K interval. But if you lived in dusty Arizona, an air filter would need replacement more often than one that has been in another, cleaner locale all it's life...

 

Iridium plugs 'could' be good for 100k miles, but sometimes they dont make it that long. I would defiantly replace the plugs and coils, it should fix your issues. I changed mine out at 55k miles when my car started to idle-dip coming up to a stoplight; it fixed everything.

 

After my son got into an Accident and totaled his 2000 Accord I gave him the Fit which my wife drove since new. He now claims that occasionally the engine will die at stop lights when idling. Like the misfire at idle it's intermittent. I took the car to my local mechanic and he could find nothing wrong. I returned it after driving it when it started to misfire and he felt it but could not diagnose the problem. It has not stalled on either my wife or I when driving and the idle miss only occurs when the engine is warmed up completely.

The Check Engine light is not illuminated.

I hate to replace all of the coil packs and plugs at only 65,000 miles without a real diagnosis.

Anyone have a clue?

 

Not me, LOL. Just ask my wife...




IMO, if you are doing your own work, it would be justified to pull all the coils and plugs and look for problems. (Coils: high resistance or burns/arcs. Plugs: looseness or wide gaps.)

If you are paying for someone else to do the repairs, labor costs might justify replacing all the parts. Otherwise you could be paying for labor twice.


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Another thing you really need to consider: Your Fit is due for a valve adjustment. Fits really need to have this done every 50 - 60K miles.

 

NEW DEVELOPMENT!!

My son took a job delivering pizza and told me that the car started stalling occasionally at traffic stops. It always would restart and the idle misfire was still present. I drove the car on the freeway and noticed some hesitation accelerating to 60 MPH but nothing that seemed bad because I couldn't really accelerate due to traffic. Later in the day my wife took the car on the freeway and noticed that it would not accelerate as quickly as it did when she drove the car. She downshifted using the paddle shifters and revved the engine up close to the red line. At about 60 MPH and 4,000 RPM she described that the engine bogged down, then made 'farting' sounds out the exhaust followed by a puff of smoke and the engine accelerated normally. He hasn't reported any further stalling.

Does anyone have an idea what's going on and what might cure thdses issues?

Thanks in advance,

 

We told you already:

PLEASE


1 Adjust valves

2 check/replace plugs

3 check/replace coil packs





And see if your son would do at least the plugs & coils himself. It's NOT difficult.

 

Gap the plugs, don't buy new - the plugs aren't at the end of their useful life yet. Also clean the connections to the coil packs.

At 50K, and before I had any problems, I gapped the plugs and cleaned the coil pack connections. The gaps were way off and the coil pack connections were dirty. I'm now at 102K with no coil pack problems. I replaced the plugs with new at 100K miles per Honda maintenance.