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Hesitation? Look Here First!:
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Old 01-12-2019, 06:42 AM   #191
mctenold
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Quote:
Originally Posted by AcquaCow View Post
Quote:
Originally Posted by mctenold View Post
Still having hesitation under load after:

New plugs and wires, new valve cover gasket, spark plug tube gaskets, PCV valve, grounding kit, new stromung hi flo cat, new fuel filter. No CELs.

What should I check next?

Also still get rough idle for a couple seconds after filling with gas.
What are your plug gaps set at?

Did you leave them pre-gapped, or did you change it?
I didn't touch them, it said they were pre-gapped for my car at .044"
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Old 01-12-2019, 06:42 AM   #192
mctenold
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Originally Posted by silverton View Post
99-01's have an ECM update that covers hesitation. It was a Service Campaign back in the day.
Any more detail? How do you get this update? I'm in an 01 RS
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Old 01-12-2019, 11:28 PM   #193
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I found it while working at a dealer. but the update pack reads, "P0031 P0130 P1133 Back fire P1445 P0065 Pinging After burn P0172 Hesitation P1443 P0172 P0065" Has to be done through a dealer with an ssm3. Good luck though, I had to figure it out on my own, no one in the shop remembered how to use the damn thing. lmao
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Old 01-13-2019, 10:58 AM   #194
mctenold
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Quote:
Originally Posted by silverton View Post
I found it while working at a dealer. but the update pack reads, "P0031 P0130 P1133 Back fire P1445 P0065 Pinging After burn P0172 Hesitation P1443 P0172 P0065" Has to be done through a dealer with an ssm3. Good luck though, I had to figure it out on my own, no one in the shop remembered how to use the damn thing. lmao
Do you have a link to more info? Was this an update put out by Subaru? If so I'd expect it to be documented better somewhere.
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Old 01-13-2019, 02:53 PM   #195
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I didn't touch them, it said they were pre-gapped for my car at .044"
That's supposedly too much for our coilpacks, at least according to the manual.

Try 0.039-0.040

I spent 8 months troubleshooting misfire issues on 2 cylinders, only to find that 0.044 is out of spec for the 2000 RS's coilpack, even though the spark plug replacement part subaru calls for comes pre-gapped to 0.044.

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Old 01-13-2019, 04:55 PM   #196
mctenold
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Quote:
Originally Posted by AcquaCow View Post

That's supposedly too much for our coilpacks, at least according to the manual.

Try 0.039-0.040

I spent 8 months troubleshooting misfire issues on 2 cylinders, only to find that 0.044 is out of spec for the 2000 RS's coilpack, even though the spark plug replacement part subaru calls for comes pre-gapped to 0.044.

-- Dave
I'm not having any misfire issues.

I'd assume I'd see a CEL if I was.

From what I've been reading, next I wanna check my front O2.

Forgot to mention I also have a backfire once the car is warm.

I have ebay UEL headers, Stromung hi flow cat, Stromung midpipe (no resonator), and stromung single tip.
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Old 01-13-2019, 06:26 PM   #197
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Do you have a link to more info? Was this an update put out by Subaru? If so I'd expect it to be documented better somewhere.
Yeah, it's an update from Subaru. There was a service campaign for some ecm reprogramming. No link to more info, just what I've seen with my hands and eyes.
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Old 01-13-2019, 06:58 PM   #198
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Originally Posted by silverton View Post

Yeah, it's an update from Subaru. There was a service campaign for some ecm reprogramming. No link to more info, just what I've seen with my hands and eyes.
Wonder if it was WWF-89.

01 RS ECM Reprogramming? - NASIOC

Would a dealership still be able to perform this reprogramming?
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Old 02-07-2019, 09:28 PM   #199
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I have pretty much always had a hesitation issue in my 2000 RS.

I have one potential clue, maybe one of you can make something of it: if the battery is disconnected for service, resetting the ECU, the car drives great. After a couple of days of the ECU "learning," the hesitation returns.
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Old 02-08-2019, 05:26 AM   #200
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Wonder if it was WWF-89.

01 RS ECM Reprogramming? - NASIOC

Would a dealership still be able to perform this reprogramming?
I believe that is the one, though the current update might even be newer. Depends though, no one at my dealership could remember how but I was able to get it done. They can't use the current DST-i box, they have to use the older interface and it has to be powered. Thankfully the current laptop's we use have a power adapter that also plug in the older boxes.

Quote:
Originally Posted by horseflesh View Post
I have pretty much always had a hesitation issue in my 2000 RS.

I have one potential clue, maybe one of you can make something of it: if the battery is disconnected for service, resetting the ECU, the car drives great. After a couple of days of the ECU "learning," the hesitation returns.
pm the last six of your vin and i can see if that wwf-89 tsb was officially completed on your car, if it wasn't you might see if you can get it done. My car had your exact symptoms, and they are completely gone with this ecm reflash. Even the first time I got it on to the road after doing the flash i was like "holy shit it's gone!!!"
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