MGF - VVC - Rev Limiter????
Discussion
I have a MGF 1.8VVC which only revs to 6000RPM.
Should rev past 7000RPM.
It seems as though it's hitting the rev limiter early.
Anyone got any ideas?
I think it may be the Camshaft Position Sensor but not really sure.
Would like a better idea before I take it to the dealer and get ripped off when they plug it in to their diagnostics!
Any help greatly appreciated
Should rev past 7000RPM.
It seems as though it's hitting the rev limiter early.
Anyone got any ideas?
I think it may be the Camshaft Position Sensor but not really sure.
Would like a better idea before I take it to the dealer and get ripped off when they plug it in to their diagnostics!
Any help greatly appreciated
Or try 'www.getyourselfapropercar.com'... 
To solve the hitting the rev limiter early problem, simply accelerate later.
Hope the info helps.
Good to see you on here mate and joining in with PH community
To solve the hitting the rev limiter early problem, simply accelerate later.
Hope the info helps.
Good to see you on here mate and joining in with PH community
Apparently your ECU has to be remapped to achieve higher rpm or you have to change the unit itself. It's not a DIY thing.
If you go onto www2.mgcars.org.uk - click on Bulletin board or Archives, you will get the answers you want - a wealth of information on that site.(look up also MGF Technical and MGF General on that site)
If you go onto www2.mgcars.org.uk - click on Bulletin board or Archives, you will get the answers you want - a wealth of information on that site.(look up also MGF Technical and MGF General on that site)
The VVC should as you say rev freely up over the 7k mark. The reason why it might not be could be any one of half a dozen things. Try, coolant sensor, VVC oil temp sensor as first easy options. I doubt it is cam position sensor if it is achieving 6k. If the engine has high miles then it could be a worn hydraulic controller (VVC actuator) worn cam belts or incorrectly fitted cam belts, if the head has been off before then the timing on the VVC units could be out. Fuelling could be a problem possibly a worn pump low on pressure.Catalytic convertor partially blocked or damaged. The best way forward is to have someone who knows his way around the Test Book diagnostics to give it a 'engine health check' and correct any incorrectly set parameters.
Hello Mike - car has already spent an hour at MGR plugged into testbook.
They have confirmed that there are no relavent error codes logged and that the ECU and all sensors are checking as ok.
They have given me 2 scenarios: -
Best Case - VVC timing incorrectly set when head went back on - 2 hrs labour and minimal cost
Worst Case - VVC modules had it. More labour intensive and very expensive parts.
the saga continues.........
They have confirmed that there are no relavent error codes logged and that the ECU and all sensors are checking as ok.
They have given me 2 scenarios: -
Best Case - VVC timing incorrectly set when head went back on - 2 hrs labour and minimal cost
Worst Case - VVC modules had it. More labour intensive and very expensive parts.
the saga continues.........
VVC modules??? If the VVC units were worn to a degree that it would cause the revs to be limited then you would hear them SHOUTING at you.Have the car checked on a RR for the fuelling, the AF ratio might be out causing a weak mixture. I have just sorted out a VVC 160 for a customer that was 'married' to his local dealer. I did a complete engine electronic health check on test book,reset parameters that were out,reset the VVC timing and replaced the HCU. This restored the power at the bottom end and mid range but it was reluctant to easily hit the rev limiter. Rolling road checks found it was running weak. He is now having the fuel pressure checked. If yours is actually hitting the limiter at 6k then it would indicate a fault elsewhere. How is the general running of the engine at the lower end??
Engine runs absolutely fine (Or so I thought). I wasn't even aware that there was aproblem until I read a poll on a forum asking "How high do you rev yours to?"..
I was shocked to read over 7k rpm..mine doesn't get near it.
Car runs fine..never misses a beat and starts on the button..
Now you mention it...from time to time there is a loud "clatter" at tickove which sounds as though it's coming from the drivers side of the engine compartment. It can get very loud (embarrassingly so) but shuts up as soon as off tickover.....could that be a VVC module??
I was shocked to read over 7k rpm..mine doesn't get near it.
Car runs fine..never misses a beat and starts on the button..
Now you mention it...from time to time there is a loud "clatter" at tickove which sounds as though it's coming from the drivers side of the engine compartment. It can get very loud (embarrassingly so) but shuts up as soon as off tickover.....could that be a VVC module??
The VVC's tend to make a noise on start up as they are the highest point on the engine and oil drains down from them when the engine is off. Initial start up causes them to rattle till oil is up.If it runs fine and you don't use the higher RPM then just have it checked at the next service.
Hi, i seem to have exactly the same problem on my S-plate Mgf VVC. It will hit the rev limiter at around 5800 RPM, and will make a loud ''tappety'' noise on tickover which dissappears over 1,500 RPM. This has only started after i had a uprated head gasket,new belts and a service which cost me £1100. So i was annoyed to dicover this happening! The work was done by heathrow MG centre which was recommended to me my Motobuild so im confident the work was done properly. Any help on this would be gratefully recieved,
Should've posted this sooner. This problem has now been fixed.
The problem you are reporting with the load rattle on tick-over is exactly what mine was doing.
Mine also occured after head gasket work.
You won't like the answer.
My VVC mechs were not put back in properly and were basically jammed hard over one way. Therfore - no variable valve timing.
Head off and re-fitting properly I'm afraid!! - and just hope that none of the teeth on the VVC mechs have been damaged!
Sorry - don't shoot the messenger, but your problem sounds identicle to mine.
Hope this helps
Pete
The problem you are reporting with the load rattle on tick-over is exactly what mine was doing.
Mine also occured after head gasket work.
You won't like the answer.
My VVC mechs were not put back in properly and were basically jammed hard over one way. Therfore - no variable valve timing.
Head off and re-fitting properly I'm afraid!! - and just hope that none of the teeth on the VVC mechs have been damaged!
Sorry - don't shoot the messenger, but your problem sounds identicle to mine.
Hope this helps
Pete
Dave Andrews fixed mine for me as part of the performance mods.
Mine was probably like it for about 2k miles.
Any competent mechanic should be able to do the work. Assuming the head has only just gone on, it won't need skimming. Just needs to be taken off a refitting. Only parts required should be a new head-gasket and a new set of head bolts. If you reckon on about £100 plus labour - should be okay.
Mine was probably like it for about 2k miles.
Any competent mechanic should be able to do the work. Assuming the head has only just gone on, it won't need skimming. Just needs to be taken off a refitting. Only parts required should be a new head-gasket and a new set of head bolts. If you reckon on about £100 plus labour - should be okay.
An old post, but a fairly common problem, often caused by HG jobs done poorly messing up the VVC. I had the same rev limiting problem and here is a video I made while I fixed mine, hopefully useful for people with the same problem:
https://youtu.be/UM_w9VWZxwM
https://youtu.be/UM_w9VWZxwM
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