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?

Re: hesitation and running issues.
 

I would suspect one or more bad coil packs. I had similar issues and that was the culprit.

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.

Re: hesitation and running issues.
 

Same with me.

Re: hesitation and running issues.
 

is there a way to test them to see if one is the culprit and which one?

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.

Re: hesitation and running issues.
 

too random for that.
also it is only when driving.
idle is so smooth

Re: hesitation and running issues.
 

I have some spare coil packs you could use to diagnose whether one is bad.

Re: hesitation and running issues.
 

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.

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.

Re: hesitation and running issues.
 

Very random.
2200 to 2300 rpm is the most common.

Re: hesitation and running issues.
 

curious, did you resolve your issue?

Re: hesitation and running issues.
 

no
getting worse... hopefully will throw a code...
frustrated

Re: hesitation and running issues.
 

Do you have a stage1av1 chip?

Re: hesitation and running issues.
 

Not yet.
Hopeully next paycheck.

Re: hesitation and running issues.
 

Ya, might be the answer to your woes. What you are describing might be the hessitation most SVXs without chips develop. That hesitation is a result of the ECU failing to learn in ignition advance below the torque converter stall speed where there is very little timing in the primary ignition table of the stock ECU firmware.

Re: hesitation and running issues.
 

so the ecu failing? does that mean i need a new ecu? or just the new chip?
i wanna get the ecu and tcu.
do you have any ecu's with the switch already installed?

Re: hesitation and running issues.
 

No, I wasn't saying the ECU is breaking. I was saying it's pretty normal for an SVX not to learn in the timing it needs to run well at the RPM range below the stall speed of the torque converter. The stock programming has very little timing in the primary ignition table in that area and relies on the knock sensors to learn in a bunch of timing. A lot of SVXs just don't learn in that timing. The learning function and the gas we get in this country just don't go well together.

I don't sell ECUs. I only sell the "chip." I sell complete TCUs because they require soldering which is better done by a professional. Most people don't bother using the switch with the ECU chip. Just install it and enjoy the improved performance and no hessitation.

Re: hesitation and running issues.
 

that would suck and be awesome all at the same time.
i have kinda put off getting themt and been chasing the problem with the inexpensive fixes.
which all together have been expensive... probably more expensive than both the tcu and ecu adapter combined.


does the memory adapter for $219 include the stage1av1 chip?


damn... now not sure... i would hate to spend 518 (for both) and be in same boat.

Re: hesitation and running issues.
 

Yes, the memory adapter isn't sold alone. $219 is for a stage1av1 which is a memory adapter loaded with a ROM with the Stage1av1 firmware, a grommet, and a small length of wire with a gold sleeve connector so you can use a switch to run the 2nd tune which is stored on the same ROM instead of the default tune. The 2nd tune has a different fuel map which can help if you are running nitrous oxide or racing extensively. On the street you won't notice the difference between the tunes and it's not worth bothering installing the gromet, wire, or a switch.

If the stage1av1 doesn't fix your problem or you don't like it you can return it as long as you do so promptly. Though you might run into a problem going back to stock if you aren't handy at soldering and your ECU doesn't already have a factory tsb ROM in it. You can't remove the stage1 unless you can either reconnect the resistor you have to clip to activate the socket in the ECU or have a TSB ROM to install in the socket.

Re: hesitation and running issues.
 

I thought the switch was for regular and premium gas?
So what octane gas is recommended without the switch?

Re: hesitation and running issues.
 

I might desolder the resistor and remove it instead of cutting it just in case!

Re: hesitation and running issues.
 

no, that was an older version of stage1. Stage1av1 will work with any grade of US gasoline. The higher the octane the better but you won't experience the hesitation even with regular.

Re: hesitation and running issues.
 

Wow, cool I didn't realize I could use regular without wiring a switch.

Re: hesitation and running issues.
 

I have used regular more often then I like with no problems other then slight loss of mpg with the ecu chip.
Even on aggressive switch

Re: hesitation and running issues.
 

You can use regular even with a stock ecu... Just worse gas mileage as it retards timing.

Re: hesitation and running issues.
 

may be u should make a diagnostic and if you need a tool you can find some good ones here: spobd2.com

Re: hesitation and running issues.
 

Any advatages upgrading from the older stage1 to the newer one?

Re: hesitation and running issues.
 

My car is obd1.

Re: hesitation and running issues.
 

Yes, av1 offers both better performance and fuel economy than stage1v5 which was the last version of stage 1 before we made the monumental leap to Stage1av1. Stage1av1 has been out for a long time now--2 or 3 years I think and I suspect it will be the last version. I think we have reached the pinacle of SVX tuning with it.

Re: hesitation and running issues.
 

What is the cost of that up grade AV1 ? I have 1v5 chip now . How much MPG. Increase.

Re: hesitation and running issues.
 

That post was spam.

Re: hesitation and running issues.
 

depends on which memory adapter you have. I don't know what the fuel economy increase is. If you ask around I think you'll find unanimous consent that there is a fuel economy increase...I don't know if you will get unanimous agrement on how much it is. You can get the price off the website on the stage 1 page: http://www.ecutune.com/svx-stage1.htm

Re: hesitation and running issues.
 

Lan... still offering 20 off both the ecu and tcu?

Re: hesitation and running issues.
 

The sale was just for the christmas/new year holiday. I responded to your PM.

Re: hesitation and running issues.
 

Ordered the ecu and tcu.
I will post about the results of this fixing my running issues.

BTW.... LAN is an asset and a great guy to have as a part of this forum!!!