coastline taxis Posted May 25, 2009 Posted May 25, 2009 Ok car is showing no fault codes at all. engine is first time starter and sounds as sweet as a nut and runs nice and smooth. its got full service history and timming belt was changed 6 months ago so the fault is not timming related. Now for the fault the car wont rev over 1500rpm so it not in limp mode and drives very responsive up to 1500 then nothing. No smoke out of exhaust or leaky pipes and all wirring intact and secure.Like ive said a few times im still learning all the time with the diagnostic so is it possible for there to be a fault and not show up on the scanner or is that just not possible if so any ideas Quote
Johndouglas Posted May 25, 2009 Posted May 25, 2009 Seem to recall someone on a forum with a similar problem. I believe a cleaned MAF sensor was the cure. Quote
Randombloke Posted May 25, 2009 Posted May 25, 2009 I'd also check that the throttle cable is not loose and that the throttle pot is ok, could be swapped out to prove. Quote
coastline taxis Posted May 26, 2009 Author Posted May 26, 2009 Have already checked the maf (swapped with a good one) and had the cable off. sorry for not making this clear in first post Quote
Randombloke Posted May 26, 2009 Posted May 26, 2009 Have already checked the maf (swapped with a good one) and had the cable off. sorry for not making this clear in first post OK, it would be worth putting a volt meter across the pot and measuring resistance while someone presses the accelerator. Quote
coastline taxis Posted May 26, 2009 Author Posted May 26, 2009 what readings should i be looking for on the volt meter Quote
Randombloke Posted May 26, 2009 Posted May 26, 2009 what readings should i be looking for on the volt meter Sorry, I meant a multimeter - it's resistance we need to measure..... As I understand it the sensor has 4 wires going to it....... Two of the wires should have a fixed resistance between them that does not change as the pedal is moved. One wire should have a resistance to one of the two "fixed" ones that goes up or down as you move the pedal, starting from a value close to the value across the first two wires, then going down to very low or vice versa, and the other wire might be the throttle idle switch, so either open or closed (zero resistance or open circuit), depending on which of the fixed wires you are testing to. You are looking for values that suddenly change across the pot wiper, or a pot wiper that does not go fully from one to another. Definitely something to test out of the car or with the sensor disconnected form the electrics - the multimeter might fry the ECU..... Does the car have cruise control? You could eliminate this by trying to use the cruise control to drive it faster. I was going to give you some cable numbers but I've just realised my manual covers only DW10ATED, I'm guessing this is a DW10BTED. Quote
coastline taxis Posted May 31, 2009 Author Posted May 31, 2009 Finally got to the bottom of this The fault was actually found by pure chance and show the lengths some mechanics will go to for a few bucks. We run and rent out c5s as taxis and as a result have over the years ended up doing repairs on most of the c5s in our area anyway this one was a new customer to us and has full service history and new timing belt 6 months ago. So having to admit defeat and just about to book the car into town center citroen as theyve never let us down in finding the problem when we couldnt, Anyway asked a driver to move the car for us as we were covered in oil so when the driver got out he pointed out that the acelarator pedal didnt seem right compared to the ones he drives for us so we pulled the whole pedal off and half way down the metal rod it had been heated up and bent. Anyway to cut a long story short the lad who has been doing the owners repairs had sorted the emmisions failure out by heating the pedal up with welding gear and bent the pedal down so it would only go to 1500 rpm so as to reduce the emmisions and pass the test. After talking to owner the recent timming belt replacement was just the belt (no tensioners,guides,or water pump) and the full service he has is all done by a d.i.y stamper kit the mechanic got from Adi. Funny though it did pass its test Quote
mlkey Posted May 31, 2009 Posted May 31, 2009 Finally got to the bottom of this The fault was actually found by pure chance and show the lengths some mechanics will go to for a few bucks. We run and rent out c5s as taxis and as a result have over the years ended up doing repairs on most of the c5s in our area anyway this one was a new customer to us and has full service history and new timing belt 6 months ago. So having to admit defeat and just about to book the car into town center citroen as theyve never let us down in finding the problem when we couldnt, Anyway asked a driver to move the car for us as we were covered in oil so when the driver got out he pointed out that the acelarator pedal didnt seem right compared to the ones he drives for us so we pulled the whole pedal off and half way down the metal rod it had been heated up and bent. Anyway to cut a long story short the lad who has been doing the owners repairs had sorted the emmisions failure out by heating the pedal up with welding gear and bent the pedal down so it would only go to 1500 rpm so as to reduce the emmisions and pass the test. After talking to owner the recent timming belt replacement was just the belt (no tensioners,guides,or water pump) and the full service he has is all done by a d.i.y stamper kit the mechanic got from Adi. Funny though it did pass its test You just can't make this stuff up! Quote
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