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Old 12-20-2010, 09:20 PM   #1 (permalink)
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Question Check engine light on and VTM4 light flashing

The car was running fine, I stopped to fill it up with gas, when I started it up it idled a little rough. As I was driving the check engine light came on and after about a quarter mile the vtm light came on i went to an auto parts store and they said the codes were three cylinder misfires, any suggestions how to proceed?
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Old 12-20-2010, 09:24 PM   #2 (permalink)
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Year? Mileage? Which codes?
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Old 12-20-2010, 10:08 PM   #3 (permalink)
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2001 Acura MDX. 207,000 miles. Not sure what the codes were, but the guy who ran the tester said that there were 3 cylinder misfires.
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Old 12-20-2010, 10:37 PM   #4 (permalink)
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tigger I urge you to read thru my situation which is several down on the current list. It is titled Check Engine light: a reason its on or a gremlin? Very similar situation and you need to get the codes. Advance Auto loaned me the reader and I wrote down the codes. that really helped me get started in the right direction.

I hope I get 200K miles out of my MDX.
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Old 12-20-2010, 11:13 PM   #5 (permalink)
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x2 for the codes. And as richez said, I hope I will get 200k miles on my 05 x. It's at 100k miles now.
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Old 12-21-2010, 09:49 AM   #6 (permalink)
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I have the same problem but with my 04 110k miles

all six cylinders are misfiring it says... my mechanic said it was nothing to worry about because we just did the head gasket, water pump, timing belt, rad and battery.

He ran the car and couldnt hear any misfires and it rides fine.
HELP?
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Old 12-21-2010, 10:26 AM   #7 (permalink)
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Quote:
Originally Posted by erberus View Post
I have the same problem but with my 04 110k miles

all six cylinders are misfiring it says... my mechanic said it was nothing to worry about because we just did the head gasket, water pump, timing belt, rad and battery.

He ran the car and couldnt hear any misfires and it rides fine.
HELP?
Did the mechanic reset the codes? Did they come back?
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Old 12-21-2010, 10:39 AM   #8 (permalink)
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I just had this and after doing some research online here and elsewhere it was determined that my '05 needed a valve adjustment (intake side was almost perfect but exhaust side needed adjustment). If you're getting the CEL and the VTM-4 lights, stand at the rear of the vehicle when it is fully warm and at idle and see if the exhaust is making a "putt putt" sound like a mini-helicopter. If it is (and you have multiple cylinder misfire codes) then a valve adjustment is probably in your future.

Other possible causes: EGR port clogged (almost a definite on the '01-'03 models), EGR valve clogged/not working, IAC valve not working, coil pack failing, spark plugs fouled.

My mileage has gone up 2mpg just from doing a valve adjustment.
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Old 12-21-2010, 12:31 PM   #9 (permalink)
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Did the mechanic reset the codes? Did they come back?
Yes, he also said that the valves were self adjusting.
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Old 12-22-2010, 01:11 AM   #10 (permalink)
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pianoman41 pretty much summed it up.

I was just through this on my '01 X as well. I would go EGR ports first, because it is cheap and easy How does the oil get in here ?. If that doesn't work, then if you can beg, borrow, buy or steal a code reader you, you can figure out which cylinders are misfiring and do a little debug by swapping coils and/or plug between the cylinders that misfire and cylinders that do not misfire.

In my case I had a bad spark plug, but it eventually caused 5 of the 6 cylinders to indicate misfires. #1 always had a code, #5 never had a code, and the others were intermittent. Mine started out just running a little rough and deteriorated from there until I figured out it was the plug.

Good luck. These misfires are a fun exercise as you will gather if you search this forum for misfires
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Old 12-22-2010, 09:54 PM   #11 (permalink)
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erberus-
Time for a new mechanic! The MDX V-6 engine valves are NOT self adjusting. Matter of fact, the 105,000 mile service requires the valve clearance be checked, along with replacement of the timing belt. Additionally, the service manual contains a detailed procedure for adjusting the valves.

If your mechanic doesn't know basics like valve adjustment, what else is he missing?
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Old 12-23-2010, 09:46 AM   #12 (permalink)
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Could you have gotten some bad gas seeing how you had just filled up?
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Old 12-23-2010, 12:43 PM   #13 (permalink)
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I had the same thing happen. Iwent to Advance Auto, borrowed their scanner and it said I had too lean a fuel mixture in bank 2. I erased the error code and it hasn't come back and it has been over a month.
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Old 12-26-2010, 08:01 PM   #14 (permalink)
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Time for a new mechanic for me as well. He informed me they were self adjusting as well. I think he just didn't want to do it. Its going into the dealer this week anyway, so maybe I'll see if they'll cut me a break and do it for me while I'm having the heater fixed.
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Old 01-03-2011, 03:19 AM   #15 (permalink)
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The codes read were:
0300 - Random cylinder misfire
0301 - Cylinder number 1 misfire
0303 - Cylinder number 3 misfire
0304 - Cylinder number 4 misfire
0305 - Cylinder number 5 misfire
0306 - Cylinder number 6 misfire

We were told to pour some fuel booster in and see if it changed anything, it did not.
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