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dohboi 09-22-2009 03:26 PM

Looking for a Really Good Honda/Acura Tech
I've got an issue with my vehicle that even the dealer can't figure out, well that is after paying them about 10hours of diagnosing at $135 an hour to tell me " I Don't know"

Vehicle is:

2003 Acura 3.2 CL

When the vehicles cold, and I start it up, it idles very rough. It's misfiring and backfiring..
I try and step on the gas it'll roll for a bit but when you try to step on it slightly harder, the pedal doesn't respond at all. After about 5 minutes of driving it gets MUCH better but I can still tell the power loss and minor misfiring.

I try to go up to 4000rpm and engine light starts flashing indicating random misfire and misfire on all cylinders.

So far the repairs I made since then to try and fix the problem:

Spark Plugs with OEM NGK's
Timing Belt, Water Pump, Tensioner, all the regular gaskets required for that
EGR Valve cleaned out
IAC Cleaned Out
Valve Adjustment (no adjustment needed)

Somewhat had the coils/injectors checked
Dumped 3 bottles of injector cleaner.

Replaced 02 Sensor

Had the dealer waste 10 hours of labour to tell me to go away.

Any ideas next?

godwin 09-22-2009 04:00 PM

There should be 4 O2 sensors.. (2 for each bank?)

Have you check the compression of your block? It could be your head / valves or a leaky head gasket.

What does the OBD2 scan tells you? If all the cylinders are misfiring it can be as fundamental as the hall sensor etc.

It doesn't sound like a dealer's work at all, if they don't scan the computer first. The things you have listed seems to be part of a normal maintenance checkup.

dohboi 09-22-2009 04:36 PM

2 O2 Sensors, one pre-cat one post cat. Pre-Cat has been replaced and still no changes, Post Cat was checked its still good

Haven't check compression.
OBD2 says:
Misfire Cylinder 1
Misfire Cylinder 2
Misfire Cylinder 3
Misfire Cylinder 4
Misfire Cylinder 5
Misfire Cylinder 6
Random/Multiple Misfire

They dealer did scan it, but couldn't find anything.

BTW Mechanical and Peformance wise, my car is stock.

godwin 09-22-2009 04:59 PM

I would take a look at the crank position hall sensor first.. then check the compression while you are at it. Since all cylinders are complaining, your problem has to be common to both banks. You also mentioned that the ignition system has been checked, so you want to see if the sensors are sending the right data.

welfare 09-23-2009 10:16 PM

does this car use a distributor? or is it coil pack?

godwin 09-23-2009 11:33 PM

Since the OP stated that he had the coils checked, I assume it doesn't use a distributor.


Originally Posted by welfare (Post 6606794)
does this car use a distributor? or is it coil pack?

welfare 09-24-2009 06:13 PM

so what does "somewhat" mean?
maybe try smoke testing for leaks?

Puck Luck 09-27-2009 12:53 AM

reminds me of a misfire problem i had on an 05 odyssey. Ended up being tight valves on a few of the cylinders. I know a couple of other guys that have seen tight valves on some of the v-6's too with the misfiring problem.
Another common thing is the egr valve. We find cleaning it usually isn't enough. needs to be replaced when it fails.
Not certain on the Acura side of things, but good chance they have similar problems

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