Mechanics

94 IMPREZA ROUGH IDLE AND ACCELERATION

1994 Subaru Other

I have a 94 Impreza with 105,000 mi. It's the last of the FWD Subaru and has a 1.8L, 4 cylinder engine.

The problem is that my father changed the sparkplugs. It worked fine before he did, and he did this to improve mileage, etc. The car worked fine driving 150 miles to where I live from home after this repair. It worked fine on the two 20 mile drives I did this past week.
I tried taking it out the other day and it started up with a rough idle. Then I didn't notice anything until I got off the dirt road and onto the pavement that it started driving strange. We noticed the front end felt rough and choppy, similar to when tires get out of balance, but it was more engine related. It felt like it did when idling. Perhaps he didn't wire the plugs exactly right, but I don't understand why it took a few drives for this to happen if so. The car then smelled like burning rubber for a few minutes. We stopped to check it out and it idled rough again. The shaking feel of the front end/engine was more noticable in idle and when accelerating. I ran it today in the driveway and it still idles roughly.

I'm thinking maybe something is up with the headgasket, so I'm going to take a look for some other symptoms. I was wondering what others thought before I take her to the local mechanic.

thanks!
Avatar
Sjc355
May 5, 2007.



Hi.
Replace spark plugs with Iridium.
It sounds like it not getting good spark, also check coil packs and igniter are operating properly

Hope that helps
Raven

Tiny
Ravenon
May 31, 2007.
My sugestion is to get hold of some genuine upper engine cleaner & run that through one of the upper engine hoses on top of intake manifold.

I did this to my impreza & it fixed the rough idle altough I had to do it twice it runs as smoooth as now

& i'm happy.

Thanks carlisa

Tiny
Wrx246
Jul 15, 2007.
If I were you i'd replace the o2 sensor it causes all the problems you're saying. Thanks

Tiny
Wrx246
Aug 3, 2007.