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Old 04-19-2004, 09:42 AM   #1
pdigiacinto
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Default Irratic Idle Problem, Pressure from gas tank.

I have read through previous posts but did not see any thing relating to this problem. I have a 1993 legacy with the 2.2l engine. This problem only happens once in a while. I try to start the car and it keeps cranking (about 6-7 revolutions), then finally starts. The car will try to fast idle, but it shakes pretty bad for about 1 minute. Then, it will smooth out and run fine. This only happens once in a while.

The car did fail emissions (I have a previous post on this) and I think the problem could be with the Bypass air control solenoid valve or purge valve? I do noitice that when I unscrew the gas cap, there is alot of pressure/vapor that escapes from the tank. Could this be from the purge valve not operating correctly? Or the bypass valve? Could both of these be causing the car to idle irratically once in a while? I would think the purge valve is suppose to send the gases back to the charcoal canister, but it might not be operating correctly?

It runs great on the highyway, no hesitation at all.

Thanks..
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Old 04-19-2004, 04:36 PM   #2
MannySoobia
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Default Re: Irratic Idle Problem, Pressure from gas tank.

Quote:
Originally posted by pdigiacinto
I have read through previous posts but did not see any thing relating to this problem. I have a 1993 legacy with the 2.2l engine. This problem only happens once in a while. I try to start the car and it keeps cranking (about 6-7 revolutions), then finally starts. The car will try to fast idle, but it shakes pretty bad for about 1 minute. Then, it will smooth out and run fine. This only happens once in a while.

It runs great on the highyway, no hesitation at all.

Thanks..
Same here, I have a 98 (transplanted 2.5), and I get the "Idle Bounce" too, but only for about 30 seconds or so after I put gas in. I'll be interested to hear if anyone knows the cure for it.

-- Manny S.
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Old 04-19-2004, 08:14 PM   #3
sha_zapple
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My car does this, but only when I use the autostart and only when it doesnt start on the first try. It will crank a few times, give up, and then try again. I figure the engine has gotten a bit too much fuel or something.
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Old 04-20-2004, 10:33 AM   #4
Charlie-III
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I would also look at the cold start circuit and/or temp sensors.

You may be too lean when cold (rough idle) but it is OK when warm.
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Old 04-20-2004, 12:53 PM   #5
RRR-K2
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I would also check the Engine Coolant Temperature (ECT) Sensor. It screws into the back of the passanger's side of water crossover pipe (under the intake manifold).

This sensor regulates the air/fuel mixture based on the temperature of the coolant, and if it's gone bad the car will run rough (rich) until it gets up to temperature.

I just had mine die on me, and before it did my idle would blip up to about 1500-2000rpm, then drop to about 300rpm when I started the car. If it didn't stall the first time it dipped, it would by the third or fourth time.

It's only a $25 part, but the pain is that you can't get a wrench on it, you need to use a 19mm deep socket. Also, jack the right-rear corner of the car, becuase when you take the plug out some anti-freeze is going to come out. But if you jack it, and are quick about getting the old one out (once it's loose) and putting the new one in, it will only leak a little bit.

Hope that helps.
Matt Kennedy
www.RockyRoadRacing.com
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Old 04-20-2004, 02:51 PM   #6
MannySoobia
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Quote:
Originally posted by RRR-K2
I would also check the Engine Coolant Temperature (ECT) Sensor. It screws into the back of the passanger's side of water crossover pipe (under the intake manifold).

This sensor regulates the air/fuel mixture based on the temperature of the coolant, and if it's gone bad the car will run rough (rich) until it gets up to temperature.

Hope that helps.
Matt Kennedy
www.RockyRoadRacing.com
I don't think that's it, I could be running the car all day, then stop to get fuel, then a couple of minutes later, After puttin some gas in, I'll get that "Idle bounce". I don't think that there would be that much temperature difference in that short of time, would there? And if so, then whenever I turn off the car for a little bit, it would do the same. In my case it's only doin it right after I put gas in.

-- Manny S.
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Old 04-20-2004, 08:22 PM   #7
pdigiacinto
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Thanks for the info Matt. I replaced the Temp sensor a few months ago. This actually solved my hesitation problem. I think it was retarding the timing cuasing the car to hesitate (when the sensor was going bad).
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