Coil change problem

[FlipFlopGriff]

Didn't have to but I had a spare (brand new) coil so I changed it last night, on the offchance this may help some of the other running/stalling issues I'm getting. It was a brand new Bosch coil with the same part number as the existing coil. Connected it all up, put the earth lead back on teh bayttery and started it up but ran like a dog - rough and overfuelling, wouldn't hold idle speed, so swapped it back. Why would it do this???
I'm sure this car is jinxed as everything I try to improve its just makes the siutuation worse!!!!!
FFG

[davep]

Maybe running Roverguage and a read of the applicable parts of this might help:

http://p38arover.com/rover/p38a/Engine_Management/...

Remember to take into account the TVR tweaks!

Good luck.

[Argent]

Probably stating the obvious but if was better with the original coil suggests the spare was duff. I've bought new parts before and it"s happened.

A.

[jr6yam]

Perhaps changing the coil over disturbed some dodgy wiring?
If so, could be a pointer to your other issues

[The AJP Griff]

If you get any ignition issues it's always worth checking the low tension wiring,particularly near the amp.Ive seen this chaffed and shorting a few times now and it will cause running issues obviously. Could you have disturbed this?

[Simon says]

The AJP Griff said:

If you get any ignition issues it's always worth checking the low tension wiring,particularly near the amp.Ive seen this chaffed and shorting a few times now and it will cause running issues obviously. Could you have disturbed thi?

. Also where the wires exit the dizzy body , seen these crumbly and wiring exposed, years of heat exposure not helping.

[FlipFlopGriff]

Was fine with the old coil back on so un likely to have disturbed any wiring. Just wanted to know if it maybe needed some time to settle down with the ECU or something silly like that?

How can I check the coil? I could change the one on the 500 to be certain.

FFG