The MGF Register Forums

Hi Folks, hoping for some guidance. I have a 2003 MG TF that we have had since new. Recently it has let us down. It is always after we have driven somewhere, never at first start up. when returning to the car it will start with very low revs that fluctuate, then when you hit the throttle it will die. If you then try and start again it will just crank and crank. Leave it 5 minutes and it will turn over again but will again have a low erratic idle and then cut out.

It has let me down twice now and both times I have had it recovered to garages, when they get round to look at it it starts first time, no fault codes and no indications to any problem. The second garage had just called me saying there is nothing wrong and I can collect.

I am fearful, as this is my wifes car, that she will be left stranded somewhere...

Has anyone had a similar issue and found a solution?

All my fingers and toes crossed..

David

Hi David - interesting that the hot idle speed is too low - I wonder whether the idle control valve is sticking? It may need replacing if so, but potentially may respond to a good clean in carb or brake cleaner?

Thanks Rob, I refused to collect the car as there is a fault. They have now changed the engine temp sensor and I have taken the car back. Done several trips out, returning home before turning off, leaving and trying to start again, to avoid more recovery issues. So far, touching wood, it has started every time and not missed a beat.... fingers crossed this was the issue

I've not come across the engine temperature sender causing a hot start problem on an MGF/TF before. A bit odd - a temperature sender issue usually gives a high idle when the engine is warm along with excess fuel consumption, as the ECU "thinks" the engine is still cold, and it essentially doing the same thing as holding open the choke on a classic car. I am not sure how the problem you've described fits into this failure mode, but it is good to know that the car is now behaving itself!

I hear you Rob, however, my youthful memories of forgetting to put the choke in and have cars lose power through over fuelling and not enough air, did remind me of the symptoms. I am still very nervous and so making sure that any trips end either at home or close and safe enough that I can walk home and back to pick it up later.

So far though, touching wood, it still behaving itself and so confidence is growing...

Fingers crossed Dave!