99 s10 to rich on #2

99 chevy s10 2.2 245,000 mi,
I have a 99 s10 the other day for no aparent reason it started running rough an started smoking,I pulled the plugs and the #2 plug was drenched with gas I check the firing and it was fine so I changed the injector with a new one, its still doing the same thing if I unplug the injector it runs better and stops smoking, the smoke is blue and smells like pure gas,all I can figure is that the injector is staying wide open at all times, any help is appreciated thanks

 

in a gasoline engine, unburned fuel is black smoke...blue smoke is oil and bluish/white is usually coolant. they all have very distinct smells as well. could your EGR valve be stuck open?

 

check injector pulse with a noid light at number 2 injector if its lit up all the time you may have pcm or wiring issues if its pulsing like it should be, and your sure its a gas problem might check fuel pressure regulator by removing the vacum line from regulator if there is any fuel in the vacum line the regulator is bad.
but a compression test would probably be a good idea to make sure its not something else a cylinder low on compression will often have a plug that is wet with gas.

 

No check engine light?

 

1. let me complement you on decent mileage for the car. if you made it that far - must be a good one.
2. apperently you like changing things in your truck. maybe change spark plug and wire on #2? keeping it simple, there is no combustion in that cylinder, thus plug gets drenched in gas. you probably have a working plug somewhere on the shelf, and any parts store has a generic length wire you could use.
i'd have it scoped at any parts store with scanner. bad plug/wire will throw a code.
3. was the plug drenched in gas ONLY, or was it gas and oil? blowen head gasket would be very likely at that mileage.
now, you said - you checked firing, right? so you "saw spark"? i'll be careful with that, as spark needs to be potent to ingnite mix, and it is very hard to have valid results by eyeballing it.

 

How did you check for spark? If you checked at the wire where it slips over the tip of the plug, that would only indicate high volts going to ground, and not necessarily causing spark in the cylinder if say the insulator was cracked. I have had lots of experience with that scenario and misfires at certain times and speeds.

To everyone else: Poster said the smoke was blue and insists he smelled pure gas. Carguy says it should be black. But is that true even on todays cars with catalytic convertors? Can the cat change the color some? The reason I ask is that years ago, I remember something let loose in my V-8 engine in the early 70's, and I was leaving a stream of white smoke behind my car for blocks, gassing people out down the sidewalk. It smelled like pure anti-freeze. I drove the car to a junkyard and handed him the keys. In my current car that has a cat, I also have burned antifreeze but I have noticed the smoke to be more like what carguy says as bluish white. So is there anything to the possibility the the high-temp cat changes color of burned gas, oil and coolant?

 

Well, the biggest problem with trying to sort through smoke colors is that a lot of times no two people necessarily perceive the same thing. Sounds like your old V8 blew a head gasket. I think the traditional white-water, blue-oil, black-fuel color scheme is still valid.