I am thinking there are many more of these issues than the 4 or 5 posted here - just not being reported.

I am going to be pressing for my dealership to warranty the ECU as it effects emissions and should fall under that warranty. The more info we can gather here the more luck we may have.

I am almost thinking that the ECU processor has slowed down and it is not making corrections to things fast enough.

 

Also - since the sight is going down on the 19th, we should swap email addy's or phone numbers to keep in touch regarding this issue.

PM me your info and I will reply in kind.

 

OK - so installed a known good ECM/ECU and the problem is still there. Also replaced the primary O2 sensor with a new OEM replacement just in case - problem is still there.

So as of now I can eliminate:

Not the MAP (installed new)
Not the O2 (installed new)
Not the coils (replaced with coils from a normal running 05)
Not the sparkplugs (tried 3 different sets - including new OEM)
Not the injectors (replaced all 4 injectors with injectors from a normal running 05)
Not the ECM/ECU (installed a known good one from an 01)

This is driving me crazy. I removed the SC and returned the car back to NA stock just to completely ensure it was not my setup or tune.

All OBD readings check out with the exception of the fuel trims are showing richer than the Helm's manual and the Honda diagnostic tool show it should be.

There has to be someone that has solved this problem. There has to be some other sensor, etc.. causing the issue.

 

sorry for the late reply but I have about 62k miles, I put the new map in and the car ran like it should again, problem solved mostly anyways, it still will go lean sometimes, like the map is jittery or something. I'll post back if the problem returns fully.

 

I've been having this same problem w/ the cruise control too! Last October I blew a piston ring so the shop had to pull the engine and take it apart to replace the ring. Since i've had my car back whenever i set the cruise control the car will accelerate to 2 mph over whatever speed i was cruising at and hold that speed.

example, i'll be cruising at 65mph, activate cruise control, and right when i press the set cruise button the car jumps to 67mph and holds that speed.

I have had a rough idle since i've had it back from the shop too. It sounds pretty much like the same problem, but my engine doesn't die as often, sometimes though when i just engage the clutch. I called that shop back after experiencing these issues and they said bring it back it could be this that or the other thing, but they told me i would have to pay to get it checked out further. That shop did some other shady stuff so i've been trying to trouble shoot the problem ever since.

here's what i've done so far, but the problem remains.

* replaced map sensor
* Compared my TPS voltage with another s2k (they're the same)
* tried plenty of fuel injector cleaners additives
* I have run an 8 gauge grounding cable from chassis to neg. battery connection
thinking they may had not reconnected a ground when the engine was pulled.
I tried to connect a second 8 gauge wire to the bolt that secures the alternator, but that resulted in the engine making knocking sounds, so i disconnected it.

My next step was to have the injectors professionallly cleaned, but it doesn't sound that that may be the cause. does anyone have a helms manual? i think there's an idle troubleshooting guide in there.

 

what if it was something as simple as a dirty/clogged throttle body gasket, giving the map sensor the wrong readings?

I'm going to try this next, it's cheap and has potential.

here's where i think air may be getting clogged (this is a BDL throttle body, but our stock TB has the same design for the map sensor air flow)

 

I have been through the Helm's guide top to bottom. Monitored my timing, TPS, temps, MAP, etc.. for many hours today and still no solution.

I reseated all connectors and used di-electric silicaon grease on all of them. The only thing I have not done so far is replace my IAC and harness. IAC is around $100 and an easy install, but the harness looks to be a total PITA.

Does not matter if the car is bone stock or SC'd - same problems exist, although they seem to be more prevelant/amplified with the SC hooked up and running. In NA form you can almost deal with it, but with the SC it really is problematic.

A local tuner thinks that an AEM-EMS would be able to adapt to the SC changes better than the OEM ECM/ECU. The problem is that the car ran awsome for about 2 months before this started.

 

I already changed the gasket and replaced the MAP - no notable change.

I am certain that it will be something really easy and stupid when this all shakes out.

 

Damn, bummer.

What about your secondary air pump? I've heard it has no effect on the idle, but perhaps somehow. Mine is sitting in my garage right now because it burned through the housing therefore producing little to no pressure. I didn't initially get a CEL for this problem, because the pump still functions and spins around it didn't produce a faulty air pump CEL. i finally started getting the p0411 for improper secondary air control flow detected.

 

I am waiting for a CEL to eventually pop so I know what the problem really is. Will probably be "P00000 - Press trip button to reset/continue" and the problem will be gone (or some silly crap like that).