Techie question MPG down
Hi all,
A bit on the technical side but an answer could benifit us all if my suspisions are correct. Here goes, the full story.
By the way it's an open floor, ANY ideas, fire them in.
I dropped my engine to do the clutch and timing belt. No major problems and I changed the Gbox oil as well.
I also changed the cat complete with the temp sensor and the other sensor, which I am guessing is the Lamda sensor?
My MPG went from 50+ to 35/36
I've whipped the cat off and there are fuel, water dropletts on the cat intake end. (The water I can understand although rather surprised so close to the exh manifold but the last run before I did this was a short one) The fuel Its a definate petrol smell.
I put an AVO across the 4 terminals of the Lamda? and get an open circuit across everything in both directions (polarity) except the black wires (which do not earth to the cat body). This is on both sensors.
On the "new" (suspect) cat I get a reading of 11.3 Ohms initially, which flicks to 13.2 after about 0.5 seconds. (The flick in the reading could be my AVO but it is s definate reading the same every time).
On the "old" (good) cat I get 11 Ohms flicking to 12.9 again consistant readings with both figures.
Has anyone got, or can anyone get the correct figures (has anyone got a new one they could test). If these little beggers are breaking down it could explain the difference in fuel consumption we are getting. I intend to put the old cat back on and see what happens but it's in a bit of a state. (Top seal gone, 1 stud sheared and an un-removable, broken heat sensor). I am in the unfortunate position of having a 93 model so I need the cat for the MOT
OTHER INFO
Both cat matrix' are clean and clear.
Car seems less willing to get up and go but will still rev and get to speed (using a whole lot more fuel)
Any ideas on anything I may have done wrong with the timing belt most welcome but I get no engine warning light or anything obvious at idle.
Again it's an open floor ANY ideas, fire them in.
If it ain't broke, take it apart and see how it works