Cold manifold (cylinder 1) on tickover

[natben]

I have not used my Cerbera for a month or so because of work but today I started it up and the manifold on cylinder one was cold but the rest were HOT.
I replaced the HT leads recently and I am confident they are connected ok.
I will remove the spark plug but what should I be looking for??
Any ideas as to what to check?

George

[clive f]

remove the plug from 1 and swap it with 2, if 2 is then cold its the plug, and put in a new one, if 1 is still cold its the ht lead.

[natben]

Thanks Clive, sounds like a plan I will give it a go in the morning and see what happens.

George

[peteA]

If its a faulty plug or lead wouldn't it be running on one less cylinder or miss firing..? Is it?

Another idea...assume it's relatively cold compared to the others...could this cylinder be over fuelling....especially during start up? Check the plug and see if its sooted up.

Good luck....hope it's something simple

[natben]

I changed the plugs over and manifold/cylinder 1 is still cold!, so next step is to replace the HT lead to cylinder 1, I have not long bought a new set but I will change this lead for one of the old ones I have and see if it makes any difference. should I try swapping HT leads from coil to plug from cylinder 1 to 2 to see if the lead is faulty??

Pete,
The car has not been used for about 4-5 weeks but it has been running rough around 2000-2500 rpm this could be the issue perhaps?.
I will change the HT lead as mentioned then see what happens.

Any comments welcome.

George

[natben]

I changed the HT lead that goes to cylinder 1 with one from a previous set and the manifold is now HOT and problem is now solved. So a faulty "new" lead to cylinder 1.

I am going to fire up the lap top and see what the software is saying.

Thanks for your help guys

[clive f]

sounds like you have the same problem I had a whie ago, bought a new set of leads, and found that the lead inside the plug extender part didn`t reach down far enough to click onto the top of the spark plug properly, just badly made, I found the closest to the original leads are sold by tvr power, now works a treat.

[DAVEY DEE]

Just out of curiosity,what made you "find out" that the manifold was cold?

[quattrophenia]

DAVEY DEE said:

Just out of curiosity,what made you "find out" that the manifold was cold?

His bacon wasn't cooking all the way to the end of the rasher
out of interest, how did the engine sound running 1 down?

[Robertjp]

glad ure sorted. Tie wrap on the manifold will melt if its hot. Interesting feedback on ht leads. I fitted a power set in march and when i removed sept two came apart. I reverted to originals and was looking around for a better fitting set. It may be my fault as when removing the engine was still quite hot, i never reckoned on it making a big diff!

[natben]

Davey Dee, I was cleaning the engine bay after having the car idling for a few minutes and my hand wasn't burnt when I accidentally touched it so realised something wasn't right. I did do the cable tie test and it showed the other manifolds to be hot but not cylinder 1.

I haven't been using the car as I have been working away so didn't notice anything out the ordinary. However it has been a bit hesitant around 2000-2500k rpm but I have the car on SORN at the moment so haven't been able to see if it has made a difference to the hesitation issue. I have a suspision that one of the throttle bodies is not seated properly and is drawing in air which is causing the hesitation. Does anyone know of a way to check if this is the case?.

It does however sound better on tickover with all six cylinders firing!!

George

[DAVEY DEE]

Been a few threads with this issue so I pre empted the prob & am having the Power throttle body gaskets put on during the rebuild.A few others seem to report they have solved the problem though.

[Robertjp]

not sure how u can check a specific throttle body, but a typical indication is going out of tune quickly and hesitation at light throttles.
Since fitting gaskets myself i have noticed a significant difference in smoothness at idle and through light throttle, its also quieter at idle too. You can achieve the same using rtv, a few others have done this,
rob