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Old 07-31-2000, 08:12 PM   #1
Girl'sRS
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Member#: 162
Join Date: Aug 1999
Location: Phila, PA
Vehicle:
1999 Impreza RS
Silverthorne Metallic

Angry Hesitation Off The Line... Bad Gas????

Ok... in the past week I have noticed the car hesitating off the line. It seems to need more gas to start to move, and I stalled this morning when a traffic light turned green. i NEVER stall! I suspect one of 2 things:

Bad batch of gas
OR
I had 4 people in the car, and I went to launch the thing and I went about 200 RPM over redline.. Ok, no biggie. But then I smelled a bad rubber smell, but my tires never squeeled or anything. My friend said it was just a belt and it was ok. The smell went away.

The new tank of gas and the bad launch occurred within a day or so of each other.. its been acting wierd all week and Ive only used 1/3 of a tank of gas, so Im not sure what to do.

Its a '99 with about 12,500 mi on it.

HELP!!!!


[This message has been edited by Girl'sRS (edited July 31, 2000).]
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Old 07-31-2000, 08:18 PM   #2
Bob J.
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I have also experianced hesitation lately , I have yet to figure it out cause it is quite inconsistent
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Old 07-31-2000, 08:24 PM   #3
kelley nelson
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I definitely notice some hesitation with a bad tank of gas sometimes. When I got my last bad tank I could detect a little stumble just sitting with the car in neutral and revving the car up from idle to 3000 rpm with little dabs of my foot.

The car doesn't seem to respond quite as well in this humid wet crappy weather either, but nowhere near stalling. If you are running the A/C there is that bit of part-throttle hesitation too.
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Old 07-31-2000, 08:29 PM   #4
Gambit
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I jsut fixed mine! Well last week I decided to pump in 94 octane just for the heck of it. I've been using 89 all these times. And I guess my car didn't like it too much. It hesitated off the line each time I gas it. So I decided to reset my ecu and it's gone. Car response just fine! This might be placebo, but the car runs like a champ with this octane. I have intake,exhaust and various other mods. Maybe it likes it more now.... Anyways try it.
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Old 07-31-2000, 08:31 PM   #5
Hucker
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That bad smell was probably your clutch screaming, "WTF are you doing to me!!!"
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Old 07-31-2000, 08:35 PM   #6
kelley nelson
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Okay, maybe helpful to offer some advice?

Two suggestions: siphon most of the fuel out of the tank and refill, or add some fresh premium gas to dilute the gatorade that is in your tank now.

In terms of avoiding bad gas, I always try to go to stations that do a lot of business. The gas must have a higher turnover at those stations and I trust the refinery to take better care of the product than the gas station.
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Old 07-31-2000, 08:53 PM   #7
RotrPwr
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Have a Nice Day?

Girl,
could be bad gas. That burning smell was your clutch slipping. Not good. Anyways, the car hesitating could also be a clogged air filter. Check it out. Ive seen it happen before. Anyways, the only other thing i would do is reset the ECU like someone else said.

Later,
Darril
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Old 07-31-2000, 10:21 PM   #8
mprezme
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Post

instead of starting a new topic, ill just ask here...

i had the hesitation prob in my 99 subaru impreze l sedan...i got rid of it and as u know 2000 legacy...i tried it all with that 99, gas, ecu, etc,

my question is tho, should i use 89 or 94? fuel..im using right now 89...no real problems...just thought id ask, since they say to use 9x on the RS's and this legacy has the same engine...thanx...
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Old 08-01-2000, 05:10 AM   #9
Peaty
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Azurite Blue Pearl

Arrow

http://home.earthlink.net/~hobiegary/hesitation.htm

Check this page out. I don't have the problem but I understand it's common.
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Old 08-01-2000, 06:28 AM   #10
HRE | giulio
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Lightbulb

with 4 people in the car, that smell might have been your clutch. or even built up crud being blown out the catalytic converters.
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Old 08-01-2000, 07:58 AM   #11
Gambit
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BS!!! our cars are tuned for 87 octane. The best thing to do is try different grades and use the lowest possible grade that provides you with optimum performance. Right now I am trying 94 cus it's cheap relatively speaking. I think I might go back to 89 after this. Each time you make a grade jump remember to reset your ecu since thes octane units represent anti knock agents. So unless you modified your car like intake and exhaust then there is no need for higher octane to maintain knock. Just my 2 cents.
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Old 08-01-2000, 10:56 AM   #12
HomerJay
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Subies are notorius for the hesitation problem. You can to that site that Peaty posted and cure the problem. My buddy has done it to his car and it seemed to fix the problem, I don't know how it will smog afterwards though. I haven't noticed it on my car.
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Old 08-01-2000, 08:56 PM   #13
Girl'sRS
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1999 Impreza RS
Silverthorne Metallic

Post

Ok... it was MUCH less humid in not-so-scenic Troy, NY today. The car ran considerably better even though I didnt have time to get fresh gas. I was terribly humid for a couple of days the yesterday was pretty hot too. Thanks everyone for the input, and assuring me that I didnt break my #1 toy!

As for the gas grades, Gambit is right, stock RS' are optimized for 87. There shouldnt be any reason for higher oct unless you have some fairly major mods done.. But to each his/herown.

Thanks Again
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