Running Rich,Read OBD 1 codes. Now What?

[speedyx14]

my 94 v6 Has been running very rich and suffers from a lack of power at highway speeds(the car struggles to get to 80mph) since I overfilled the oil(due to a leak that is now repaired). I'd say I'm getting 10 mpg. Now keep in mind that the car ran fine before the overfilling incident. But when the overfill happened, I was getting loads of blue smoke and some black soot residue coming out of my exhaust as I limped the car home a nice distance.

I finally got the OBD1 codes checked. Here is what I got:
1. Code 77- Digital EGR Circuit.

I personally believe that the crappy performance may be due to the Cat being clogged, but it is welded on and I lack the tools to get it off and take a look. I have heard that a clogged cat can cause an EGR code-77 to pop up. Is it possible that the oil could have screwed my EGR? Could I clean it or does it need to be replaced?

2. Code 93- Transmission pressure control solenoid Circuit.

I'm not sure what to think of this one. I never had any shifting problems. The part is pretty cheap. What type of symptoms would a faulty trans pressure solenoid cause? Is it easy to replace? Could this lead to a serious transmission problem?

The next step for me is taking the car to a shop to get the Cat checked.Any help or suggestions on these codes would be nice

[tkoforpresident]

Re: Running Rich,Read OBD 1 codes. Now What?

your cat is def. blown, all that oil probably crapped it up.

all the 3.4's get the EGR code, you'd have to take off the upper intake to clean out the EGR passage that runs underneath it, otherwise u will always throw that code no matter how new your digital EGR valve is.

and Code 93, i wouldn't worry about it either.

get a new cat and call it a day, maybe some new plugs too if you haven't changed those yet, or your o2 sensors.

[Rob Bell]

Re: Running Rich,Read OBD 1 codes. Now What?

I'm not familiar with the 3.4, but you could try this to clean out the passage.... Once you verify that it is really clogged.

[speedyx14]

Re: Running Rich,Read OBD 1 codes. Now What?

^70 bucks? Hot damn!

[flamingchicken]

Re: Running Rich,Read OBD 1 codes. Now What?

and what do you do with all of the carbon deposits that fall down into your intake...

[tkoforpresident]

Re: Running Rich,Read OBD 1 codes. Now What?

thats why you should remove the intake and save 70 dollars.

it takes like 20 minutes to remove the plenum, and 5 minutes to clean the passage with a coat hanger.

[Rob Bell]

Re: Running Rich,Read OBD 1 codes. Now What?

Oh well if it's that easy to remove the intake, then I would def do that instead.

As for the carbon, it just gets chewed up by the tool and runs through the engine with no harm done.

[tkoforpresident]

Re: Running Rich,Read OBD 1 codes. Now What?

i used a garden hose to blast out all the caked up carbon in my passage =)

then sprayed it with some carb cleaner.