Extended Rough Idle and Stalling diagnose on '04 - Page 2 - Acura MDX Forum : Acura MDX SUV Forums
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post #16 of 23 (permalink) Old 03-23-2012, 12:11 PM
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I posted this in a different thread, but thought you guys might benefit from it.

I finally decided to drop off the car to my indy for a valve adjustment. He has a very interesting way of diagnosing if the valves need adjustments or not (he does not have a scanner to read the MAP voltage). He says typically, the manifold pressure is a vacuum at idle. He has noticed that if the vacuum is less than 20psi, the engine needs some attention. Mine registered at 15psi, so he went forward with the valve adjustment. He said almost all of my exhaust valves were tight. Intake were fine. After the valve adjustment, my manifold pressure reads 22psi, so he feels confident my problem will be gone. So only time will tell.

It's been a couple of days and my wife says the car feels smoother with no cold hesitation and so far so good. My indy only charged me $155 for the valve adjustment so for cars that have less than 105K miles, I would actually recommend a valve adjustment before doing the "easy" stuff since plugs and coils are pretty expensive.

Once again, my car is a 2006 with 78K miles. Codes that were present were P0300-306 and P0175.

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post #17 of 23 (permalink) Old 08-13-2012, 08:33 PM
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Any update? The the VA fix the rough idle issue?
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post #18 of 23 (permalink) Old 10-16-2012, 03:16 PM
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I'm looking for an update too as I'm seeing similar issues.
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post #19 of 23 (permalink) Old 11-14-2012, 03:15 PM
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I just dropped mine off at the shop with the same issue. H said typically they need at minimum a valve adjustment. Worst case scenario is the valves get burnt due to a faulty seal and you have to take the head off.

I will update.
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post #20 of 23 (permalink) Old 11-16-2012, 08:25 PM
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Just picked mine up. $985 for valve adjustment, 3 coils and 6 spark plugs. I was shocked! It was an independent shop too.
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post #21 of 23 (permalink) Old 01-20-2014, 01:21 PM
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I had the same problem (listed in forum title) that seems to have disappeared now...

while taking off the plenum I decided to disconnect the the two hoses that are attached to each other. One hose goes from the rear manifold cover to the air intake and the other goes to the throttle body?? it was the one going to the throttle body that when I pulled it off about three table spoons (maybe more) of fluid poured out it was blue and not flammable with no smell. cleaned the under the plenum (not really needed) and put everything back together and it runs so much smoother its really noticeable. Went out to start it this morning and everything worked like a dream.

not sure what was the fix was but it ran smooth and didn't stall when put into gear. can anyone tell me what the fluid was?

cost 30min at my brother-inlaws = cheap!
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post #22 of 23 (permalink) Old 01-25-2014, 02:58 PM
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Same problem. (Stalling, rough idle, misfire codes on all cylinders, random cylinder and "system too rich")

The Dealer that I have the car at right now is recommending all sorts of things, with no guarantee. (The trial and error method of repair.) Thankfully, they've admitted they don't know what is wrong instead of trying to sell me any particular method.

From searching places like this, I keep coming back to valve adjustment, over these suggestions:
-drain fuel, replace
-replace coil packs and plugs

Does the originator of this thread have any updates? Did the valve adjustment solve the problem?
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post #23 of 23 (permalink) Old 01-21-2015, 09:43 PM
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Reply to multiple misfiring cylinders

So, I went to my local Honda dealer. I've had previous work done there and I haven't been pleased. I thought I cleared the problem up with them. I took used 2004 Mdx to them for routine trans fluid change and vtm-4 fluid change(differential fluid). Around 100 miles after, my check engine light came on, and vtm indicator light came on as soon as I started it the next morning. I read the codes with OBD-II reader from local parts store. Multiple misfires in all cylinders. Long story short, I pulled plugs out, bosch iridiums, I had put in 40,000mi previously. they were good. I pulled off lid to intake, I saw nothing terrible... I looked thru, all working parts mostly listed on this forum. I found a loose clamp on a black tube going into air intake. This black tube travels to the back valve cover, and under starting conditions and when put under a heavier load will move when loose, and cause at least the misfire. Now, I'm not accusing anyone, but I drove the car for business trips putting sometimes a thousand miles a week before going to Honda and never a check engine light. Check all your basic connections before taking it to shop and after! it took me 1 minute and no money! but I first endured all sorts of strange ideas and misinfo on what it could be! check your connections! These cars are awesome for their technology and durability! If you have something wrong-----question it!!!
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