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Remanufactured Bosch 0281 diesel ECUs, unlimited mileage 1 year warranty from £150.00

     Our problem car of the week was a Golf GTi with the older type "K" Jetronic type injection system. This system uses non electrically operated fuel injectors that spray high pressure fuel directly into the inlet manifold, the amount being sprayed being controlled by a metering unit. The car in question had just had a new engine fitted and appeared to have severe injection system faults since it had plenty of ignition sparks but would not run for more than a few seconds. Hence it's arrival at the end of a tow rope. First job after checking for basic engine faults such as compression and ignition was to have a look at the Injectors themselves so they were taken out and bench tested. Two were blocked solid, the other two were in bad condition also. Often these type of injectors will clean up, but these were too far gone and a new set was needed. After setting up the car and a new set of injectors it was off like a rocket. That is until the owner came to to collect it when it suddenly developed a bad low speed misfire. So it was left with us again until fully sorted. Further investigation showed the injection system to be clogged up again, so much so that towards the end of this investigation the car was down to a top speed of 20 MPH. There is a fuel filter fitted in line to stop this sort of occurence, but since it is not unknown for a non original equipment filter not to filter efficiently we replaced it. Then the Injection system was stripped, thoroughly cleaned, and reassembled. Fortunately this worked since the cost of a new metering unit was a lot more than a set of injectors. Exit a happier Golf Gti owner on collecting his car for the second time.

  Volkswagen cars are supposed to ignore garages and just drive for ever through Deserts and whatever but the word hadn't reached this particular Volkswagen Passatt. It came in coughing and spluttering, not a happy car at all. The Passatt was a Fuel injection model, but with only one big fuel injector (SPI, or Single Point Injection) instead of the more common 4 seperate fuel Injectors. The principles of operation are still the same for this type of system though and as always we first ran through Engine Tuning checks on the car to see where the problem area was. The reason the car was running so badly was found to be fuelling - the Single Point Injector had gone demented and was  shovelling fuel in like crazy. It may have been doing this because it was sticky in operation or because the engine management system was telling it to. Before going to town on the management system we removed the injector, checked it on the bench, and ultrasonically cleaned and backflushed it. It was about 10 % down on performance but this is common for injectors with a few miles and wouldn't cause a problem of this magnitude. Next engine management systems checking revealed a problem with the Oxygen sensor - this tells the management system computer what the exhaust emissions are and adjusts the petrol from the injector accordingly. Because of poor connections in the wiring to the Oxygen sensor the management system went demented and told the injector to mis-behave. We sorted out the wiring fault and unleashed the Passatt to find Deserts or whatever again.

Hessitation, power loss. 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 of the most commen causes of this is fouled or sticking injectors that can be reconditioned at less than tenth the price of a new set. For more information on injector servicing click on injector.

Emissions failure.  The most common cause of rich running faults is the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check,  to check the ECU strip back the insulation onthe signal wire from the lamna sensor, this wire is usually black.  Then hold the bare wire between you finger and thumb then touch your other hand on to the battery positive if the emissions come down then you have a faulty lamna sensor but if the emissions remain the same then the ECU is most likely at fault. For more information on ECU testing click on ECU

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