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  #31  
Old 09-15-2016, 03:49 PM
Tyler46 Tyler46 is offline
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Join Date: Nov 2014
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You could try taking off the IAC and cleaning it. Or at idle unplug the IAC and see if it stalls out.

Then take off the intake and clean it out really good and get all the gunk off the butterfly valve. I had a slight vibration at idle, plus my plugs had lived their life, so after plugs, wires, coil pack, IAC cleaning, MAF cleaning, and cleaning out the throttle body it ran like a brand new truck.
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  #32  
Old 09-16-2016, 09:07 AM
tomw0 tomw0 is offline
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Default Re: rough idle in 2008 2.3L automatic

I have lost sight of the problem. I thought is was terrible fuel economy, but that seems fixed.
What is wrong?
tom
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  #33  
Old 09-17-2016, 02:11 PM
zolar1 zolar1 is offline
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Default Re: rough idle in 2008 2.3L automatic

OK, tank right before fuel pump replacement I got 25mpg.

1 week later I got 28MPG. Will have to check average over the next few tanks.

Also just had tires balanced and rotated and properly inflated.

Dunno what my MPG will do now.

STILL have a bad miss/backfire when I turn on the A/C.
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  #34  
Old 10-07-2016, 01:08 PM
zolar1 zolar1 is offline
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Default Re: rough idle in 2008 2.3L automatic

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Originally Posted by zolar1 View Post
Update

Fuel pump now making a high pitched noise. Sometimes louder than others.

Taking it to the repair shop on 9/1/16 to have it replaced and new fuel filter as well.

Dang thing costs a small fortune for the part.

Reason:

I have the 111.5" wheelbase. The 125's pumps are 1/2 the price!

Still engine missing a lot. Sometimes lopes badly in the morning then straightens out after 5 seconds or so. Any idea on that one?

Been running ethanol free gas for past 6 weeks and adding B12 chemtool to it as well.

My EPA mpg is rated 18 city. I an getting 23.5 city with that mix and with the engine miss and bad fuel pump. Highway MPG no change (maybe slightly less MPG at 55 mph) If A/C on engine vibration/miss very noticeable. MPG drops to 18 mpg city.

I do smell raw fuel on startup in the mornings but that goes away after a minute or two. No apparent soot buildup on tailpipe.

I wonder what I would get if everything was fixed?

I did not notice a fuel rail return line either nor a fuel pressure regulator.

Does it even have those????

I also noticed that when the engine miss is at it's worst, A/C on, engine hot, in gear and waiting at stop light, the brake pedal goes nearly to the floor.

Truck only has 63K miles on it (it is also an automatic).
UPDATE: October 07, 2016 I found the raw fuel issue. The canister vent valve is leaking.

I disconnected the purge valve vacuum line under the hood and plugged off the nipple on the intake manifold. Runs better but still has a little roughness in the mornings and a little thru the day.
I also replace the IAC which helped a bit too.
Attached Images
File Type: jpg Cannister leak?.jpg (93.0 KB, 6 views)
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  #35  
Old 10-15-2016, 04:52 PM
zolar1 zolar1 is offline
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Default Re: rough idle in 2008 2.3L automatic

Seems the charcoal vent valve is leaking on mine.
Not the purge valve under the hood but the one under the bed.

Changed the IAC and it made an improvement.
Autozone checked for codes P0455 (gross leak in evap).
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