[stevesodyssey]

I've seen several posts regarding this issue and seen some good answers and solutions, but I need to share my experience to see if anyone out there has tried the same things to resolve this problem.

Already done the following things listed below.

1. replaced spark plugs
2. replaced coil pack for each cylinder (used brand X, not from Honda dealership)

After replacing plugs and coil packs, engine ran fine and CEL and TCS lights went out, but returned approx 10 later, along with the rough idle. Took van to AutoZone and several of the codes made reference to misfires due to bad coil pack(s), and bad EGR function, and blockage. So then I proceeded to do the following.

3. cleaned build up in EGR path under intake manifold cover (looks like ant farm pattern)
4. cleaned ports for each cylinder that corresponds to EGR path that was cleaned in #3
5. replaced EGR valve

Still have the same problem, don't know what to do next, other than collecting funds to pass along to mechanic that is going to diagnose and fix this problem for me.

 

[sontakke]

are they oem spark plugs or Bosch ones?

also you need to find which cylinder is misfiring and that way you can concentrate on that one

if coil, spark plugs and egr passage is not fixing it, then you need to do compression and leakdown test to rule out mechanical problems. hope your mechanic is as good as odyclub!

By the way, congratulations on your first post after being a lurker for seven years!

 

[stevesodyssey]

Thanks for your response. Need to clarify that the lights came back on after 10 days, not 10 . . .

The plugs are NGK brand (platinum I believe).

I will probably take it in to shop and see what they can diagnose and/or recommend.

Has it been that long? This van has been very good to me for the last 265,000 miles. Guessing it has been seven years since there was a need to post a problem that I wasn't able to fix by reading other posts by my skilled peers.

 

[dvpatel]

What are/were the codes?

 

[stevesodyssey]

These were the codes after replacing plugs and coil packs, but before working on EGR blockage and replacing EGR valve.

0300
0301
0302
0304
0305
0306
1399

 

[dvpatel]

All the cylinder codes. Interesting. I would see if the valves are in spec and have you had any maintenance done recently? I remember a couple of threads where shortly after maintenance, the owners got ALL the cylinder codes because a gasket that was replaced was installed inversely.

 

[davedrivesody]

Disconnect each coil in succession and see if the rough idle is unchanged for any of them. It's possible one of the new coils has gone bad.

BTW, the OE spark plug is the NGK iridium, not platinum. I don't think the platinum's will cause any problems - just not last as long. However the first step to fixing a problem is to get everything up to original spec.

Dave

 

[sontakke]

on 99 original were laser platinum and replacement were listed as laser iridium; laser indicates the precious metal both in the wire and on the tip

 

[OdyinNH]

Probably one of the aftermarket coils is crap. This is one area I would only do OEM parts.

 

[Buffalo4]

Disconnect each coil in succession and see if the rough idle is unchanged for any of them. It's possible one of the new coils has gone bad.

BTW, the OE spark plug is the NGK iridium, not platinum. I don't think the platinum's will cause any problems - just not last as long. However the first step to fixing a problem is to get everything up to original spec.

Dave

On my 2003, the recommended (in the manual) replacement spark plugs are:NGK PZFR5F-11 and the Denso PKJ16CR-L11. Both are platinum and not iridium. I would almost guess that the NGK V-power copper plug would work just fine for at least 30K.
Stevesodyssey,
My best guesses would be a spark plug coil(s) and/or a valve lash adjustment.

Buffalo4

 

[stevesodyssey]

Thanks to all who responded with your input and suggestions.

It turns out that when I replaced the plugs, I was a little too over cautious about not over tightening them, and a couple of the plugs became a little loose after 10 days. According to the mechanic, this caused the plug and coil pack to overheat and therefore burning out one of the coil packs. He replaced the bad one, and tightened the other two that were a little loose. CEL and TCS lights are now off, and engine sounds and runs smoothly. While he had the van in the shop, he recommended cleaning the injectors, due to the age and mileage. The best part is that all of this work was done at a very reasonable and fair price.

So I guess the plugs, coil packs, and EGR work, all played a part in getting this back in good running order, which just goes to show that the suggestions on this forum for my problem, as well as many others with the same problem, were right on the money.

 

[New Dad New Van]

Thanks for posting the conclusion. I love threads that end this way. :nice:

 

[pablocruise]

I am encouraged! Just now experiencing the same base issues: CEL flashing, TCSL on, engine rough. Prepared to start the journey. Thanks for the great information.