Won't start sometimes, not hot start issue.

[Green is good]

Guys looking for some help again, the Chim occasionally used to play up and refuse to start, turn the key and nothing happens, no cranking, just silence. I recently had a service and other work done and had the guys fit the hot start kit, problem solved, or so i thought. Went down to Malton in Yorkshire this Sunday and it did it again several times. The fuel pump primes up as normal but the engine won't crank when the key is in the start position. Believe it or not I have discovered that a sharp slap on the dash whilst I hold the key in the start position gets it going, but the last time it was touch and go as to whether it would start.

What do you think is the likely cause of this strange fault? Starter works fine and it fires right away when it eventually turns over. I can't trust it now. Imobiliser maybe?

[miniman]

I'd be starting with a new ignition switch.

[rigga]

Fuse link in the passenger footwell,mine did the same thing and found a poor spade connection,direct feed wire from ignition key,or relay to starter i believe.

Edited..... didnt fully read your post,but the slapping of the dash would to me indicate the imobilizer part of the alarm playing up ?

Edited by rigga on Tuesday 26th April 23:08

[bigdods]

Sharp slap on the dash=immobiliser. Its located in the dash and the relays get tired and stick - the hot start mod is designed to stop this happening but sounds like yours is already FUBAR'd.

[philhoward]

Mide does exactly the same. Just out of interest how much is a new imobiliser unit and are they easy to fit?

[bigdods]

philhoward said:

Mide does exactly the same. Just out of interest how much is a new imobiliser unit and are they easy to fit?

Carl Baker is the god of alarms when it comes to TVR's , give him a call http://www.tvruk.tv/www.tvruk.tv/index.html

[Flintstone]

One of mine did this, cracked ecu board.

[Green is good]

Thanks for the replies, I think it is very likely, from what has been said that the immobiliser is the cause, but I will have to try a few easier checks first. I'm afraid to take it to an auto electrician as they could spend hours on it trying to find the cause and I can't spend anymore on it at the moment or the better half is not going to believe me any more when I say a Chim is cheap to run and reliable. It has just had a £2.5k overhaul and when it played up on Sunday I got that look from her, you all know what I'm talking about!

[bsdnazz]

bigdods said:

Sharp slap on the dash=immobiliser. Its located in the dash and the relays get tired and stick - the hot start mod is designed to stop this happening but sounds like yours is already FUBAR'd.

The hot start fix does not fix problems with the immobilizer relays as the immobilizer is in the dashboard.

[Green is good]

bsdnazz said:

bigdods said:

Sharp slap on the dash=immobiliser. Its located in the dash and the relays get tired and stick - the hot start mod is designed to stop this happening but sounds like yours is already FUBAR'd.

The hot start fix does not fix problems with the immobilizer relays as the immobilizer is in the dashboard.

Can you disconnect/bypass the immobiliser as a way of testing this out?