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Old 03-20-2005, 12:51 PM   #1
Skidd
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Location: SA-TX (Hozer expat)
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STM

Default My00 4200 RPM Hesitation Solved!

I (like many other MY00rs owners) have suffered with that 4200 RPM hesitaiton for a while now. I'd say for about the last 20k or so miles. I knew it was something to do with the Ignition system, but didn't know what. And countless searches on this site and others didn't produce any answers. Nobody could quite figure out what it was. ECU Resets and and the lot did nothing.

But.. as of yesterday, it's gone. My care no longer does it. Smooth power all the way through the Revs. And the answer was way too obvious and easy.

I did 2 thing to my car on Saturday. One of the two was the fix. And I"m pretty sure I know which it was. I replaced the Spark Plugs and the Plug Wires. Yep.. thats it! Fixed. I don't believe the wires were the fix though. I'm sure it was the plugs. Cuz my old plugs were WAY worn out. I had a set of (here it comes) Bosch Plat+4s. They went in at about 20K miles. And bosch swares they are good for alot longer than a standard plug. But, with my ar now at just over 60K miles, I'm doing a bunch of tuneup stuff to my car. The plugs are due, that I know, but they should still be atleats in fair condition.. right?

Long story short, the +4s were SHOT! 2 of them had the center contact just about level with the white insulator. the other 2 had the center contact burnt down inside the insulator. That isn't good. No wonder the Ignition system was doing strange things. The spark it was making sucked.! It was so bad, that at Idle, if I just blipped the gas, the motor would just hesitate a fraction of a second then rev up.

Now, sure, these plugs have been in for about 40K miles. But a set of Plats should do alright for that long. And since the hesitation has been happening for about 20K miles. That means that the plugs were likely gone or going after only 20K in my car. What the hell was the point of Plats if they last the exact same as a standard plug? Sheesh... what a waste!

So.. in went a set of NGK V-Power plugs, and a new set of Factory Subaru wires, an ECU Reset.. Fire up my car, and I notced the difference RIGHT AWAY! The throtle response at idle was better. Go for a drive around the block, it just feels smoother when I get on the gas. Hit the Highway onramp, 3rd gear, pass the 4200 mark (I can ALWAYS get it to hesitate doing this).. and.... NOTHING!! Smooth. Nice! No momentary lack of power. It just felt smooth and strong!

Moral of my Story.
Bosch Plat+4 SUCK! NGKs RULE!

Shane.
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Old 03-20-2005, 12:54 PM   #2
sidewayz
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or just get the ecu reflash that Subaru had as a recall and that will solve it.
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Old 03-20-2005, 01:03 PM   #3
Handsdown
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my bosh plats failed in 4k miles

denso standards in 2k miles

for the EJ25, it's NKG or nothing.
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Old 03-20-2005, 01:20 PM   #4
mofugga
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subaru's dont' like bosch plugs the the ecu reflash is helpful also
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Old 03-20-2005, 01:33 PM   #5
RS_to_WRX_swap
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I call Bosch plat +4 fuel blockers. All the extra electrodes do is block fuel from getting to the spark as quick. Worst invetion ever, i can't belive they still sell them.
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Old 03-20-2005, 01:38 PM   #6
Skidd
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Quote:
Originally Posted by sidewayz
or just get the ecu reflash that Subaru had as a recall and that will solve it.
Huh? Reflash? I never found any info about that? Was it a factory recall? What years? Why does Subaru hate letting it's customers know about recalls?
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Old 03-20-2005, 02:02 PM   #7
mofugga
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it's not really a recall, it's called a "campaign"


next time you go to the dealer ask them about it. takes a couple minutes for them to do
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Old 03-20-2005, 02:18 PM   #8
bheinz57
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Skidd, let us know if you start having misfire/hesitation again within a couple hundred miles or so. The coil can be bad and made the wires bad/plugs foul. If so, you may see the dame symptoms sometime down the line. Brian
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Old 03-24-2005, 02:45 PM   #9
Skidd
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Quote:
Originally Posted by bheinz57
Skidd, let us know if you start having misfire/hesitation again within a couple hundred miles or so. The coil can be bad and made the wires bad/plugs foul. If so, you may see the dame symptoms sometime down the line. Brian
Just an update, I have a nice long commute each morning, and it's been almost 500 miles now,and she still runs fine.
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Old 03-25-2005, 12:06 AM   #10
DJ 9iron
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Before I changed my plugs last fall, my hesitation came and went... Since the change, it hasn't returned. Oh well.
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Old 03-25-2005, 02:05 AM   #11
horrorbiz
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I had slight hesitation problems. I got new spark plugs with a 90k service on Tuesday and it is completely gone and feels like a new car.
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Old 03-25-2005, 09:37 AM   #12
DreddRS25
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May I ask what color your car is?

I've seen two blue, one silver, one black, and two green GC8s in SA. Is that one of you? I've got a coupe BRP 01.
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Old 03-25-2005, 10:03 AM   #13
Skidd
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Quote:
Originally Posted by DreddRS25
May I ask what color your car is?

I've seen two blue, one silver, one black, and two green GC8s in SA. Is that one of you? I've got a coupe BRP 01.
There sure are not alot of Subies here are there?
I'm driving a Silver MY00 sedan. It's a dead give away, because although it's a 2000 model, I'm from Canada, so it has the the "L" style fog lights.

I've yet to see a 4-door silver GC in SA yet. But I've seen a handfull of the others. Mostly coupes though. What color is yours?

My Girlfriend loves the fact that we Subie owners wave to each other as we pass.
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