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exchange ecu, ecu repair, replacement ecu, reconditioned ecu’s, remanufactured ecu, ecu testing,
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BMW ECU reconditioning, ECU repair, ECU testing. New remanufactured & used ECU’s
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Motor Industry Management magazine article
by David Peacock, Peacock and Purvey 2003
The BMW that came in for repair would run fine for a while
But then stop completely for a few minutes before restarting and carrying on as if nothing had ever happened. The trouble with this sort of fault is that all the tuning and diagnostics in the world can't find it unless the fault occurs while the test gear is hooked up to it. I think it was Volkswagen who started the widely held belief that linking the car to a computer will fix everything, it won't,and it can't find a fault that is reading within its correct limits, but fortunately the fault did happen to us while we had the test gear attached. The cause was a greatly reduced ignition spark energy level.
The fault was caused by the Ignition Control which unfortunately is part of the Injection Control Unit and not available seperately. The price of this was bad news and strongly reinforced the owner's decision to go Diesel on his next purchase. Luckily though the unit had not damaged any unavailable parts within it though so a reconditioned unit cured the problem. .
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BMW all makes 1993 - 2004 onwards
Emission Failures -
High CO & low lamna reading. common causes of rich running faults are the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lamna sensor, this wire is usually black. Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lamna sensor or wiring but if the emissions remain the same then the ECU is a possible fault. For more information on ECU testing click on ECU
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High CO with normal lamna reading. If the oxygen level is below 1% then a high CO with a normal lamna reading can only be one thing - the catalytic converter, when ever you get this reading the catalyst should be condemed. But always make sure you check the oxygen level first, if its high (over 1% at speed) then you’ve got a leaking exhaust or engine runing problems.
BMW all makes 1986 - onwards
Hessitation, power loss, missfire. This type of problem can be one of the most time consuming faults to find because the problem often is only slight and the fault only shows up when the car is being driven under load. One common cause of this is a fouled or sticking injector.
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Nottingham Evening Post/motoring article
by David Peacock, Peacock and Purvey
BMW'S are normally renowned for their smoothness and power but not this 323I. Cruising on a light throttle was OK but acceleration at any rate other than slight brought about a series of jerks until steady state cruising was achieved again. It checked over OK on normal tuning checks until the engine speed was held at about 3000 RPM when the fuel mixture was found to be running very rich. We then checked the fuel pressure since the pressure regulator can fail to give high pressure and consequent rich running - not guilty in this case though. Next on the suspect list were the Injectors, a sticky injector or two could cause this sort of fault. A check of the ignition pattern on the osciloscope at speed didn't show any differences here that would be reflected by injector faults. To make certain we double checked by measuring the comparitive Petrol quantity injected into each cylinder by using the gas analyser. No one cylinder was responsible for the richness,it was across the board. Checks on sensor inputs to the Control Unit revealed all Ok except for a higher than normal signal from the Air Flow Meter. Closer inspection of this unit showed signs of it having been tampered with, so we took the cover off and reset the meter spring back to where it should be. On roadtest now even worse, it would hardly accelerate at all. We were certain now that the Air Flow Meter was at fault and that someone had tweaked it to try to compensate for this. Our suspiscions were confirmed when a new unit cured the problem -back to BMW type performance again.
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