Car used a full tank of gas in 2.5 hours of driving yesterday. Tested the coolant temp sensor after i drove it, i get 264 ohms when i select "2000" on the multimeter resistance.
its a b35
Need resistance and voltage for e34 b35 sensors
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Bimmerguy2002
- Posts: 11973
- Joined: Oct 03, 2007
- Location: Lodi, California
That is the right value for a warm engine but it does not mean you have a good connection back to ECM. If you have very low resistance on one side of the harness (ground) and at least some on the other, it probably has good wiring. I'm not sure what the voltage should be at power up but I would guess about 5v on the non grounded side and of course zero on the other.
If it was running fine maybe you have a leak. Or were you doing 90? At 90-100 mph I think 2.5 hours is about right.
If it was running fine maybe you have a leak. Or were you doing 90? At 90-100 mph I think 2.5 hours is about right.
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Bimmerguy2002
- Posts: 11973
- Joined: Oct 03, 2007
- Location: Lodi, California
Thanks. Was traveling about 65 MPH, never exceeded 70 (small highway). Suspected a leak the hard part is its hot outside now and anything evaporates quicklytn535i wrote:That is the right value for a warm engine but it does not mean you have a good connection back to ECM. If you have very low resistance on one side of the harness (ground) and at least some on the other, it probably has good wiring. I'm not sure what the voltage should be at power up but I would guess about 5v on the non grounded side and of course zero on the other.
If it was running fine maybe you have a leak. Or were you doing 90? At 90-100 mph I think 2.5 hours is about right.
Will pull the fuel pump/filter bracket to inspect clamps and hoses, recently replaced fuel pump to diagnose a few months back!
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Bimmerguy2002
- Posts: 11973
- Joined: Oct 03, 2007
- Location: Lodi, California
i took it out, my car is gutted outtn535i wrote:Did you check the OBC to see if it agreed with the mileage based on tank fill up. If the OBC is telling you resonable mileage then the computer is saying it is running right. That might help confirm a potential leak rather than too rich.
definitely thinking its a fuel leak. A 40 min drive today cost me 1/4 tank gas 
its cool outside now so i have the chance to do more inspections tomorrow.ahab wrote:Odor should confirm a leak, even if it doesn't help pinpoint the location. Be careful, remember the bridal party limo in SF a few weeks ago!?!?
@ limoIf the injectors, o-rings, cold start or the line to the cold start leak it will drip on the side of the block and maybe even pool on the ledge above the oil pan behind the starter were heat will cause rapid evaporation and nice smells but it is hard to spot. Been there and never once left a drip on the ground.