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Old August 13th, 2016, 01:44 PM   #1
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06 j32- hesitation ?

Hi guys, hoping some one can come up with some ideas on a little issue I am having with my av6.

Car is starting "rougher" , almost hesitating to start and maintain a steady idle for the first 10 seconds or so.

Then, when going up hill, the car is hesitating/ "cutting in and out" when accelerating . This is especially prevalent in the mornings.

No codes, engine lights etc, has me a little confused ?

Any advise is appreciated

Thanks
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Old August 16th, 2016, 05:22 PM   #2
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Any ideas ? seems like the hot weather aggravates it more ? all comments welcome. My main mechanic went on vacation, so would like to bounce around a few ideas on what it could be.

I know it's hard to diagnose anything without seeing/driving it. Almost like a bad sensor ?

I'll try and post a video later if it helps..
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Old August 16th, 2016, 05:39 PM   #3
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spark plugs? is the air filter clean? valve adjustment? clog cats? You are still running the j30a4 ecu with the j32 correct?
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Old August 16th, 2016, 08:01 PM   #4
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I agree with thisaznboi88. These are good places to start. To me this sounds like a lean condition. I had a very similar issue with a Mazda MX6 where the air intake hose was old and cracked allowing air into the system behind the air flow meter. The meter was reading a set volume, telling the computer how much fuel to mix with that volume, yet the volume was higher because of the air getting in through the cracks. This caused rough idle, hesitation, and poor running. I have no experience like this with our engines, but would a bad gasket, or something warped with the intake manifold cause this type of symptoms?
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Old August 18th, 2016, 08:08 AM   #5
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spark plugs? is the air filter clean? valve adjustment? clog cats? You are still running the j30a4 ecu with the j32 correct?
Some good suggestions. I will replace spark plugs within the next couple of days and report back. Stock new air filter just put on.
Clogged cats, interesting point you brang up. Car still has the original exhaust ( I will look more into this after spark plugs.)

Yes, J30a5 ecu (stock), on the j32. When it was on the dyno in late February of this year, it was not running lean at all.

All great points to start at ken.
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Old August 18th, 2016, 08:13 AM   #6
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I agree with thisaznboi88. These are good places to start. To me this sounds like a lean condition. I had a very similar issue with a Mazda MX6 where the air intake hose was old and cracked allowing air into the system behind the air flow meter. The meter was reading a set volume, telling the computer how much fuel to mix with that volume, yet the volume was higher because of the air getting in through the cracks. This caused rough idle, hesitation, and poor running. I have no experience like this with our engines, but would a bad gasket, or something warped with the intake manifold cause this type of symptoms?
Thanks for the input. Let me start at the few suggestions given, and I will report back.

I was even thinking maybe a weak fuel pump?
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Old August 18th, 2016, 06:55 PM   #7
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Had this happen a few times, most of them it has been that the spark plugs are beyond bad condition, emulating a lean condition by providing a bad ignition. Under high power they'll heat up and clean themselves a bit but when you're not trying to dyno it **** all seems to be going on.

New plugs, clear ecu, try it again.
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Old August 18th, 2016, 07:11 PM   #8
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Changed out spark plugs tonight. Car is responding much better. Still starts a little "rougher" than I like.

After plugs, I didn't get any hesitation, and overall, it has more of a "snappy" response.

I will still report back if anything else comes up.

Thanks guys .
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Old August 18th, 2016, 08:29 PM   #9
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time for an italian tune up
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Old August 20th, 2016, 09:49 AM   #10
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yes sir lol
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Old August 20th, 2016, 11:41 AM   #11
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Italian tune up?

It's always the sparks... as an aside you can move down a heat range to change the ignition profile and how the spark plugs effect the charge. Using the racing version of the iridium plugs also pulls the shroud of the spark plug back into the head, leaving only the tip and arm exposed. I've found this keeps them much cooler and prevents premature wear as the plugs aren't acting as hot plugs with a large section of heated metal protruding into the head.
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Old September 4th, 2016, 12:53 PM   #12
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Cars starting to have a bad lag and rougher starts again..
Wondering if this could be a throttle position sensor ? I would imagine this would hve nothing to do with the cold starts

* note, the car hasnt seen alot of driving for the past 2 months.. don/t know if that triggers anything
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Old September 4th, 2016, 02:46 PM   #13
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OK, Just inspected EGR valve, and looks to me like it's "seized". The "plunger" will not slide up or down, even with a good amount of force with a Flathead screw driver.
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Old September 6th, 2016, 12:28 PM   #14
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Thoughts on an egr by pass or replace with honda egr valve ?

The egr valve currently on it has seen it's days...
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