Martin R Posted May 4, 2009 Posted May 4, 2009 Matt, ive only just spotted this I had not drove the car hard at all since the rebuilt. I therefore dont know if this problem has been there since then. If you are struggling a call to DVA may help. If i can help at all please let me know.
Matt C Posted May 4, 2009 Author Posted May 4, 2009 Matt, ive only just spotted this I had not drove the car hard at all since the rebuilt. I therefore dont know if this problem has been there since then. If you are struggling a call to DVA may help. If i can help at all please let me know. Did DVA set the VVC up? Might call him to ask how to test it. Bloomin' bad timing with baby teasing us most of this weekend!
Martin R Posted May 4, 2009 Posted May 4, 2009 Did DVA set the VVC up? Might call him to ask how to test it. Bloomin' bad timing with baby teasing us most of this weekend! He did Matt. That was the reason i took it to him as it seemed mighty complicated to me. He reckons its easy. I supplied him the head and he let me have it back ready to bolt on. I doubt its the vvc though.
Matt C Posted May 4, 2009 Author Posted May 4, 2009 He did Matt. That was the reason i took it to him as it seemed mighty complicated to me. He reckons its easy. I supplied him the head and he let me have it back ready to bolt on. I doubt its the vvc though. Thanks...I'll try and call him tmr and see what he suggests to try.. I ahve confidence that if DVA built / assembled the VVC mechanism, then it works. Must be electrical/sensor related (I so hate electrical bits!!).
Guest Glen Posted May 4, 2009 Posted May 4, 2009 Matt, I'm not convinced the brown coolant temp sensor is the same as the brown oil temp sensor on the VVC hydraulic control unit. I've been trying to find the rover part number for the oil temp sensor for a while but failed miserably.
Martin R Posted May 4, 2009 Posted May 4, 2009 Matt, i feel really bad about this. Let me know the score ASAP please
Matt C Posted May 4, 2009 Author Posted May 4, 2009 Matt, i feel really bad about this. Let me know the score ASAP please Your guess is as good as mine at the mo! I'm stumped.... Only thing left to try is tap the VVC mechanism incase it is stuck... There are 3 things that can cause it. Oil temp not warm, cam position sensor, and VVC itself. 2nd one I know is ok as diconnecting it increases idle speed. First one, seems the sensor is not the same (night phone Eliseparts tmr), and the third, well DVA built it so should be ok....
Steve J Posted May 5, 2009 Posted May 5, 2009 Have you tried the wheel speed sensor? If this is disconnected or faulty, the car revs are restricted to around 5.5k
Matt C Posted May 5, 2009 Author Posted May 5, 2009 Have you tried the wheel speed sensor?If this is disconnected or faulty, the car revs are restricted to around 5.5k Hi Steve, I had ruled it out as the Stack needle is rock steady. Will check it is not loose and give it a clean just to be sure (not got a spare to swap over).
Guest Glen Posted May 5, 2009 Posted May 5, 2009 I had another good search on the internet last night and found several MGF forums where people had the same rev limit issue. Even after connecting the testbook diagnostic kit there were no sensors shown as faulty. In the end they ended up taking it to a Rover specialist to sort out but none of them listed what the actual problem was (or how much it cost to fix).
Matt C Posted May 5, 2009 Author Posted May 5, 2009 Wheel speed sensor looks ok. Cleaned it up and cleaned all the teeth on the driveshaft. ECU connnections cleaned. VVC "tapped". VVC oil temp sender is giving out 300ohms which seems about right. Bugger... run out of ideas.
Steve J Posted May 5, 2009 Posted May 5, 2009 If you've got a faulty cam sensor then it also goes into safe mode and restricts to 5,600rpm. Sure it'll be a sensor that's broken, you just need to find which one
Matt C Posted May 5, 2009 Author Posted May 5, 2009 If you've got a faulty cam sensor then it also goes into safe mode and restricts to 5,600rpm. Sure it'll be a sensor that's broken, you just need to find which one This is the first thing I checked. Idles at 750rpm, but when disconnecting it, the idle increased to 1100tpm. That tells me it works ok - anyone think this not necessarily means its working?
Steve J Posted May 5, 2009 Posted May 5, 2009 Not sure about that test Matt, but you may be right. This is an extract from the manual: EMN.13 - CAMSHAFT POSITION SENSOR fWC versions onhrt The camshaft position sensor has two functions: i) to provide an engine position reference for the sequential injection; ii) to measure the actual inlet cam period as controlled by the WC mechanism. The inductive type sensor is mounted on the right hand side of the cylinder head and projects into the cam housing to be in close proximity to a toothed reluctor on the inlet camshaft of no. 2 cylinder. By interpreting the signals received, the ECM is able to distinguish firing TDC from exhaust TDC, and initiate the injection sequence on engine start. If, however, the sensor should fail before engine start, the engine will start and continue to run in grouped fuelling mode (injectors activated in pairs) with a reduced rev. limit of approx. 5,600 rpm applied to protect the engine from potential damage. If sensor failure occurs whilst the engine is running, the engine will continue to run in sequential fuelling mode until ignition switch off. If the ECM detects any faults with cam period measurement during start up and initial running, the ECM wil! try and drive (dependent on the cause of the fault) the mechanism to minimum cam period. Engine speed will be limited to approx. 5,600 rpm, and the idle speed will be raised. If the ECM loses the cam pried signal during running, the cam period will remain frozen at the last valid period. Engine speed may be limited as bw as 5500 rpm depending on cam period when the fault occured. The idle speed will be raised for the rest of the journey. Note that a cam period measurement fault will only be recorded by the ECM if the fault is detected at start-up or during initial running.
Matt C Posted May 5, 2009 Author Posted May 5, 2009 Thanks Steve. I would love it if that were it. Shame my idle speed is 750rpm when warm. Might try and find a cam posn sensor to swap just to competely rule it out.
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