93 legacy 2.2 auto.

A couple months ago i noticed on a cold start, that it would start, rev up like normal and then bog down almost die then kick back up to the high idle. Now its getting worse, when it kicks off the high idle, it doesn't recover, just bogs and almost dies, but if i tap the gas it revs back up, and slowly idles down like it should. Is there some sort of cold start or something i can clean?

How does the car run when it's warmed up? Do you only have problems when starting the car up after it's sat overnight or all day?

 

You might have a sticking idle air control (IAC) valve or the coolant temp sensor may be going bad, which is causing improper air fuel ratio on startup.

 

How is your gas mileage? Is your Legacy AWD or FWD?

How does the car run when it's warmed up? Do you only have problems when starting the car up after it's sat overnight or all day?

 

You might have a sticking idle air control (IAC) valve or the coolant temp sensor may be going bad, which is causing improper air fuel ratio on startup.

 

How is your gas mileage? Is your Legacy AWD or FWD?

 

Car runs great except for the first minute it stutters, this only happens after sitting over night, sitting 8 hours at work it starts right up no problems, gas mileage is 26-28mpg, and its a legacy awd, is there a way to clean the iac?

Edited September 9, 201213 yr by coolskaterkid

Do you first notice the stuttering when you put the car in gear and drive away, or do you notice the problem as well when you leave the car in park and rev the engine?

 

I had a similar issue over 10 years ago where my Legacy would stumble when I took off in the morning when cold. If I left the engine warm up a minute or so I didn't have any problems. I don't recall it ever coming back after I did my AWD & 5MT conversion, so I'm not sure if it was related to the transmission or not.

 

You can try spraying some brake cleaner in the IAC valve tube. That may help clean some of the carbon off.

Do you first notice the stuttering when you put the car in gear and drive away, or do you notice the problem as well when you leave the car in park and rev the engine?

 

I had a similar issue over 10 years ago where my Legacy would stumble when I took off in the morning when cold. If I left the engine warm up a minute or so I didn't have any problems. I don't recall it ever coming back after I did my AWD & 5MT conversion, so I'm not sure if it was related to the transmission or not.

 

You can try spraying some brake cleaner in the IAC valve tube. That may help clean some of the carbon off.

It does it while its still in park, it stumbles recovers, and then stumbles again, when i put it in gear it usually will stumble when first hitting the gas, but then pulls right out of it and has no problems after the first accel, it never dies though, i sprayed some cleaner down the iac tube, will report tomorrow to see if there is any change.

Yeah, that sounds a lot like my problem. I really wish I found out what the actual problem was...

Yea i tried spraying the cleaner down the tube it didnt help, i just hope once it gets cold down to around 15 deg this winter if it will be more trouble some.