Hi Guys,
Been noticing my 01 is running pretty rich and the mileage is really suffering lately. I have not really had a chance to look her over yet, but below are the details that I have.
2001 Tiger 955i, 53,000 miles
Triumph off road tune, custom aftermarket exhaust
I did check all sensors are plugged in and making good connection
New plugs, clean air filter.
Runs awesome, just VERY rich. Stinky exhaust rich.
Any ideas?
I got same problem with my 1999 885i,
Pull of the return hose of the tank,if the fuel comes with a bit of pressure when you're pullin' the hose...
U got an inoperative fuel pump regulator...
If you got an inoperative fuel pump regulator;
Fuel can't get back to the gastank and gets off the exhoust with a bad,bad smell...
Hassan, we've been swapping PMs for a while, but it's only reading this did I fully understand what you are saying. If the fuel rail pressure is too high the injectors are pushing in too much fuel and so it'll be rich and also in your case would explain the very high tickover.
Sorry for the momentary highjack Sas, but I think he's onto something. Sadly, I've no experience of the early girly fuel pressure sensor to comment on what's wrong or how to fix.
Fuel pressure regulator, that is something to check. I will get in the service manual and figure out the testing procedure. Should be able to rig up a test fitting, I have a fuel pressure tester for fuel injected cars already.
That'll be a step forward Sas as we seem to have a sudden spat of these and it's hard trying to workout what's wrong from a 1000 miles away.
If you come up with one, a good DIY test would be a godsend :wink:
Question, with the Triumph off road tune, does it still use the O2 sensor? (wondering if I have a faulty O2)
Yes it does. The O2 is narrow band so will only give three indications:
Around 0.1 volt = lean
0.45 volts = correct mix
Around 0.9 volts = rich
Watching the O2 on the scanner it is bouncing between .1 and .86 volts. But I checked my fuel pressure and it holds steady at between 44 and 46psi, so that is within specs.
I need to run a can of injector cleaner through it "just because" and see what that does.
I also ordered the cable so I can play with the tune edit software that is talked about so much here. Hoping to get my mileage back up where it should be.
Bouncing is normal, it's a dumb animal; it only knows rich or weak, it doesn't know by how much.
Regarding the cable you can use Tune ECU, but I don't think Tunedit works with a standard cable, I'm pretty sure it only works with Tuneboy's own
(very expensive) cable. I'd love to be wrong though!!!
If it does work, it'll allow you to read from the ECU, but won't allow you to write. For that you'll need a software key. Where Tunedit does score though is that it's much, much easier to use when modifying maps.
I probably have the names of the programs mixed up. It is the shareware one listed in the stickies. Hopefully I can use it to lean out the mixture a bit without buying the expensive software and key.
Can an engine temp sensor give a low reading or do they just stop working, only ask because if ECU thinks the engine is colder than it is it will run rich
It sure can. That is why I really watched the temps on the scanner as my engine warmed up. Both coolant and intake temps.
Spot on!! The baro sensor (built into the ECU and connected to the airbox via a pipe running down the right side of the subframe) is involved also. The ECU takes account of the engine temp to know whether to use the warm-up map or the normal running map. It then uses the baro reading along with the air temp to work out how much oxygen is in the air and thus how much fuel is needed. Simple eH???
I guess that's not what's wrong with yours then
OBD2 cable does'nt like tuneboy.
Need Tuneboy cable AAARRRGG!!
Spot on BB the baro pipe can give that problem (been there) or plug into Tune ECU see what sensors are reading.
My baro pipe was disconected at the ECU for ages (from when I bought it) until I noticed, connected it and noticed no difference whats so ever.
Over the last 10 yrs, the baro range for the UK has been roughly 90mb around a mean pressure of about 1010mb.
That equates to less than 10% variation. Add in effects of a blocked air filter vs a clean one and you'll hit about 10%
10% more oxygen means 1.4% more fuel so over a tankful slightly more than 1/2 a mile per gallon variation ie instead of 45 mpg which is roughly what I get, it's be 44.37 mpg. You won't notice that.... but it means a lot to your engine. But where it really comes into it's own is overseas where pressure varys greatly with altitude. No need for re-jetting!!
With the baro disconnected, you might just notice, on a cold damp day, that it runs a bit smoother and pulls a bit harder. That''s the extra oxygen and moisture in the air giving it a boost.
Yes, I've connected it for my trip over the alps this year