Ok so i have a 1995 toyota 4runner 135k 5spd. I just recently got 9.8 mpg, its cold here just over the past week around the low 30's. My egr valve has been throwing a code. i can hear air coming from the modulator for it i believe. When it first starts in the moring its cold. If u mess with the throttle it will stumble, for a minute or so u can get some blue or black smoke. Just wondering if anyone has some input on this thanks. what do u think i should do. I was getting around 15-17 city prior to this cold weather.

 

Holly crap, blue and black smoke hu? I would check your oil for water. Might be a blown head gasket. You should get over 15 mpg, even in 4wd.

 

But it doesnt run hot at all and it uses no antifreeze. i did suck water into my motor about 4 months ago. it stalled it out but i did everthing properly and have been getting 15-17mpg after that incident.

 

anyone???

 

well since it started suddenly, and you were getting good MPG prior, it is hard to guess. the blue and BLACK smoke is worrisome. is it a 22re or 3vze? when was the last tuneup? fuel filter? o2 sensor? fuel system cleaning?

 

What code is being thrown by the EGR?

 

its the 3.0. i havent personally done a full tuneup , fuel filter, or anythin else to it yet, minus changing every single fluid. i can do almost anything on a car. its throwin code 71 i believe

 

it only smokes when it cold out for like 30 seconds then when its warm it runs fine but still bad fuel mileage

 

black smoke = fuel, blue smoke = oil.

if it's blowing blue smoke on startup or heavy deceleration, it's most likely your valve stem seals.

 

egr valve is cold after i drove it for awhile. does this mean its bad??? no smoke today, plugs are fine and i got 13 mpg still i want to try and improve it. any ideas

 

oh and its always mostly black smoke, hardly ever the blue smoke

 

hmm, checked your intake hose between the AFM and the throttle body for leaks or cracks? any air getting in there and not going through the AFM will cause all sorts of wierd problems.

 

That's what I was wanting to get at, if it's constant black smoke I'm guessing leaky injectors or the computer is dumping more fuel than needed.

edit: I would help diagnose the code itself but I no longer have access to alldata. Do you know what the code description is?

 

code 71 is the egr valve, i can get access to alldata , or a scanner if i need to but thats what it was last time i checked it.

 

Cold Start Injector?