homerhobson

ECU Problem, the car currently runs and ECU code 021 906 258A bosch 0261 200 495. I cant find any of these ECU's and would like to know can i fit another one or are they simply for that car set and thts it, there appear to be loads on ebay etc with pretty similar codes but instaed of the letter A at the end they have a combinatiuon of letters. Im no expert hence the reason im asking. Thanks Homer mail: [email protected]

The car ran fine for months. Then all of a sudden it started splutering, i hardly made it home. Iv left it a couple of weeks, but inbetween iv reset some fault codes and its made no difference. Yesterday i changed the Lambda sensor and MAF and it still has made no difference. With the MAF plugged in it the car barely ticks over, even on tick over its lumpy when you set off its lumpy the engine is like its missfiring but it isnt if you catch my drift. On tick over there is black soot coming out of the exhaust, when you set off it makes lots of black smoke but does clear eventually. Its definatly not oil smoke. The car runs dog ruff and is definatly overfueling by a vast amount. Take the MAF off and when cold the car is very difficult to start, you have to keep the revs up, but it will go. when car is warm car starts ok ticks over as well but not a normal rev range its only just and so ticking over. The car runs but when you lift off the throttle it tends to lurch forward as if even though youve removed foot from throttle the ECU is still injecting fuel into barrels, this only happens for a second or two. The MPG goes back up to what it was before all these problems 28 MPG, I cant seen it being the MAF iv got five of the things and surely they are not all broken. Plus when you disconect the MAF whilst engine running the engine dies. Unplugging any other sensors also has the same effect, Temp, Knock, throttle pot. If only some one some where could issue a document on how to test these sensors. Throttle Pot is surely simple to test using a multi meter but i dont know what values to look for.

Im now stumped. The spluttering heap got a new Lambda sensor, and MAF and i checked the wiring back to the plug onto the ECU. The car is still doing the same. Im now scratching my head, what else could be causing the over fueling and i mean over fueling 7 mpg. The car does have a piggy back chip on ( daztec ) is it possible that this might have malfunctioned and be causing the problem. I would also like to here from anyone that has any electrical wiring diagrams for my 93/94 VR6. Iv hunted the net for months and cant find any. The only ones that do come up are always a bit vague, ie they never have all the wires on say from the maf so i cant trace them all to the relevant places and check there not broken. I can remove the piggy back chip either, i thought i could just pull it off and the car would revert back to the original ecu. I think some where along the line the imobilaizer must come into play and as soon as you disconect it the car stops and wont start. Any information on this matter would be greatly apprciated. Thanks Homer James thanks MAF arrived spot on.

My Vr6 ( golf ) recently started splutering. I did the batery reset thing ( disconnect and re connect a few mins later to see if this would cure it ) and it didnt. The car went from doing 28 mpg to 7 mpg and is burning vast amounts of fuel but it runs and just and so ticks over. Very lumpy. If you disconnect the MAF it will run and will do 22 to 25 mpg but also runs like a bag of you know what. Does this indicate a problem with the MAF or could it be the Lambda sensor. Iv had this running before with out the lambda sensor conneted and it ran quite well apart from it only did 17 mpg. Iv hopefully bought one from james ( thank you v much ) just to try and im also considering also changing the lambda sensor at the same time to eliminate that. The car does have a bolt on chip wired directly into the wiring loom. A quick test i thought was to simply disconnect the chip from the wiring loom ( it has plug ) and let the car revert back to the original ecu but the bloody car wont start when i disconect it. Dont think its plugs or leads because once your above 2000 rpm apart from burning more petrol than esso hold in the hole of the UK the car runs v well. Any recomendations would be most appreciated. and no i cant get it VAG comed i live 70 miles away from the nearest Vag com person. Car is very early 93 VR6 OBD1 Thanks Ben