OBD II 171 & 304 code and a Traction Control question .
Last week I purchased a 1996 SE 3.8 engine with automatic transmission, 95k miles. Found out pretty quickly that it was using coolant. Had the dreaded lower intake manifold problem. I was quoted $700 by a local shop to fix..so I put the parts in mysellf. I used the Dorman kit that includes a new Black plastic manifold, stovepipe and upper gasket, I used an FelPro gasket set on the lower..maybe not the best choices?
Found out after the fact that I did not position the clear plastic tube into the PVC valve correctly. ( I have another post on that)
In addition to the gaskets,
I flushed the system and refilled prestone. and Installed a new radiator cap. I ran a bottle of techtron fuel injector cleaner through the gas tank, I changed the oil & filter, new air filter. new transmission filter and fluid, new fuel filter, spark plug and wires. and installed a new downstream oxygen sensor. I suppose I should do the 180 degree thermostat change out that I read about here?
Any way now that I have all this maintenance done I am having a couple of problems that I din't see before I did all this. The check engine light has come on a couple of times with code 171 (lean fuel mix ) and I just got a 304 (misfire on plug 4)
I'm thinking that the last time a saw a 171 was on my wife'* Grand Caravan and replacing the fuel pump was the fix. I suppose the misfire on 4 could be caused by lean mix on ther rear bank..since 4 is on the rear. Any ideas what I can try? The fuel filter looked like it had never been changed..(it was an AC Delco branded filter maybe original equip, same for the transmission fluid/filter looked like it had never been serviced.
Did I loosen up a bunch of crap in the gas tank...Is there anything I can try to resolve this short of replacing the fuel pump? The engine seems to run pretty good.
A third problem that has just shown up is with the Traction Control. The buttone next to the shfter... is shutting itself off. When I try to turn it back on it doesn't turn on(button doesn't light and the TRACTION CONTROL IS OFF Message on the dashboard doesn't turn off) A minute or 2 later I press the button and maybe it takes..and the button lights and the message goes off on the console. Any ideas?