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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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| Originally posted by ///Matt@Dec 22 2004, 05:18 AM |
A good buddy @ Autohaus of Clayton BMW* said that clearing out my ECU (Engine Control Unit - Bosch model) would get my 97 540i back on track.* Apparently all that octane boost and fuel injector cleaner was confusing my engine's computer into thinking that a higher octane gas was the norm.* Now my acceleration is dwindling and MPG's aren't so good.... If anyone knows how to clear this out please let me know.
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| Originally posted by billB@Dec 22 2004, 03:05 PM |
Since knocking can be attributed to one or more of the following:
A.lower actain like in ///Mat's or bad fuel.
C.Extreme temp and overheating.
Can we reprogram the chip/MAP to "make it" think its reading the correct values?
| Originally posted by BeelZibub+Dec 22 2004, 05:09 PM--><div class='quotetop'>QUOTE(BeelZibub @ Dec 22 2004, 05:09 PM)</div><div class='quotemain'> |
1: That I think his mate was refering to a computer reboot - which usually recalibrates/sets everything and I don't think it will work in this case.
2: That lowering the octane of the fuel shouldn't be a problem as the knock sensors are there to handle this. However, obviously fuel economy and power will be effected.
3: Although point 2 is true, both of us seem to have suffered probs since lowering the octane rating of our fuels(Thankfully though I treated her to a full tank of super premium at lunch time) - I wait to see if she gets back to her old self or I will have to do some proper diagnostics on her - Which I really can't be bothered to do.
A good buddy @ Autohaus of Clayton BMW said that clearing out my ECU (Engine Control Unit - Bosch model) would get my 97 540i back on track. Apparently all that octane boost and fuel injector cleaner was confusing my engine's computer into thinking that a higher octane gas was the norm. Now my acceleration is dwindling and MPG's aren't so good.... If anyone knows how to clear this out please let me know.
To reset the computer is simple.....Disconnect the positive and neagtive from battery and cross these two wires, (with a screwdriver, or another wire) as long as the pos and neg are attached. Then open the ignition swith for 10-20 mins, re-connect the battery and the ecu is reset to default...
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