Xj cherokee replaced oxy sensors still rich!

[Tuffeb]

Any other solutions?

Injectors? Fuel pressure reg? Tps?

Can't think on anything els

Replaced both oxy sensors still runs rough and big patch of black carbon comes out


All spark plugs are black

[Tuffeb]

Did the code test wich is really cool by the way

Got 13

Vaccum line map sensor from what I can see

[Tuffeb]

Dosent do the 55 flashes at the end tho after 5 mins of waiting

Just get the 13 flashes n that's all

[Tuffeb]

No read that wrong

In getting code 12
Then 55

[Jonny Jeep]

Map sensor can cause problems if the small rubber tube at the bottom is bad. Another thing that can cause rich running is the engines temp sensors. You can check temp sensor resistance against this chart.

http://farm5.staticflickr.com/4017/4390712792_4a2867313d.jpg

[rainman]

Check your fuel pressure.

[Tuffeb]

What should fuel pressure be at normally?

[rainman]

Obd1 31psi @ idle. 39psi At idle with the fuel pressure regulator (fpr) vac hose off and plugged.

Obd2 49 psi constant

Also check the vac line is not sucking petrol from the fpr diaphragm being ruptured if obd1.