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  #1  
Old 07-13-2012, 08:56 PM
steveherman steveherman is offline
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hesitation and running issues.

I am having hesitation issues.
Very random.
Worse when cold... but still there when warm.
I have replaced O2 sensors(ngk)
Spark plugs (ngk laser iridium)
Knock sensors
Coolant temp sensor (oem)
MAF (twice)
TPS (and tested to make sure it is fine and adjusted with meter)
Cam and crank sensors
Intake gaskets
Alternator (maniac)
All vacuum hoses under intake
Fuel filter AND 6 new fuel injectors.

Any one got any other ideas?
Anyone know of somewhere in central Florida I could take it and get reputable service?

Last edited by steveherman; 07-13-2012 at 08:59 PM.
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  #2  
Old 07-13-2012, 09:30 PM
Blacky Blacky is offline
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Re: hesitation and running issues.

I would suspect one or more bad coil packs. I had similar issues and that was the culprit.
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  #3  
Old 07-13-2012, 10:01 PM
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icingdeath88 icingdeath88 is offline
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Re: hesitation and running issues.

Have a look at the intake right before it gets to the throttle bodies. The big plastic one. There are many nipples for large hoses to connect to. Maybe one of them is cracked and has a leak.

Another thing that comes to mind is the engine/chassis/battery grounds. Make sure they are all good and solid. You can add an engine>battery ground if you want to as well.
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  #4  
Old 07-14-2012, 01:31 AM
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AlcyoneSVX AlcyoneSVX is offline
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Re: hesitation and running issues.

Quote:
Originally Posted by Blacky View Post
I would suspect one or more bad coil packs. I had similar issues and that was the culprit.
Same with me.
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  #5  
Old 07-14-2012, 05:12 AM
steveherman steveherman is offline
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Re: hesitation and running issues.

Quote:
Originally Posted by Blacky View Post
I would suspect one or more bad coil packs. I had similar issues and that was the culprit.

is there a way to test them to see if one is the culprit and which one?
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  #6  
Old 07-14-2012, 06:28 AM
Blacky Blacky is offline
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Re: hesitation and running issues.

With the car running and hesitation present, disconnect one at a time. If the hesitation gets worse, that one is OK. If the hesitation stays the same you've found your man. If more than one is bad you could leave the bad one disconnected and continue to pull one at a time and see if there is any change.
After I changed my plugs and one bad coil I broke down and brought it in to a local Subaru specialist. He diagnosed and replaced another bad coil with a spare I supplied.
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  #7  
Old 07-14-2012, 09:25 AM
steveherman steveherman is offline
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Re: hesitation and running issues.

Quote:
Originally Posted by Blacky View Post
With the car running and hesitation present, disconnect one at a time. If the hesitation gets worse, that one is OK. If the hesitation stays the same you've found your man. If more than one is bad you could leave the bad one disconnected and continue to pull one at a time and see if there is any change.
After I changed my plugs and one bad coil I broke down and brought it in to a local Subaru specialist. He diagnosed and replaced another bad coil with a spare I supplied.
too random for that.
also it is only when driving.
idle is so smooth
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  #8  
Old 07-14-2012, 09:51 AM
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icingdeath88 icingdeath88 is offline
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Re: hesitation and running issues.

I have some spare coil packs you could use to diagnose whether one is bad.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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  #9  
Old 07-14-2012, 10:47 AM
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Re: hesitation and running issues.

Quote:
Originally Posted by icingdeath88 View Post
I have some spare coil packs you could use to diagnose whether one is bad.
I would try the coils as well. I had this issue, one of my coils was lazy. It would work occationally and not at full strength. Borrow the coils and try one at a time, drive with it for awhile and then switch to the next one until you find the bad one. Time consuming but worth the effort.
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  #10  
Old 07-29-2012, 05:50 PM
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Re: hesitation and running issues.

At what rpm range do you experience this? I swear I've done everything you have and my vehicle does this mostly when the engine is at temperature.
The only things I haven't done were replace the complete throttle body and place in a new IRIS valve.
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  #11  
Old 08-20-2012, 08:56 PM
steveherman steveherman is offline
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Re: hesitation and running issues.

Quote:
Originally Posted by msvx95 View Post
At what rpm range do you experience this? I swear I've done everything you have and my vehicle does this mostly when the engine is at temperature.
The only things I haven't done were replace the complete throttle body and place in a new IRIS valve.
Very random.
2200 to 2300 rpm is the most common.
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  #12  
Old 09-17-2012, 08:06 PM
alia176 alia176 is offline
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Re: hesitation and running issues.

curious, did you resolve your issue?
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  #13  
Old 01-18-2013, 07:59 AM
steveherman steveherman is offline
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Re: hesitation and running issues.

no
getting worse... hopefully will throw a code...
frustrated
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  #14  
Old 01-18-2013, 03:35 PM
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Re: hesitation and running issues.

Do you have a stage1av1 chip?
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  #15  
Old 01-18-2013, 07:06 PM
steveherman steveherman is offline
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Re: hesitation and running issues.

Quote:
Originally Posted by longassname View Post
Do you have a stage1av1 chip?
Not yet.
Hopeully next paycheck.
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