Originally Posted by 80s-new-man

Hi there,
I’ve had the engine on my 1992 XR4x4 2.9 rebuilt 7 months ago but has been running rich until I get the emerald ecu fitted. As I knew this I decided to clean plugs the other day. Today I took both lambdas out and cleaned them with carb cleaner.
All put back & didn’t touch anything else.
coming to start several times , I get crank and the occasional cough but no fire up.
i thought maybe the fuel pump had gone but I notice the no.6 cylinder exhaust outlet manifold is quite hot despite never firing up, whereas all others are stone cold. I guess that means fuel is getting there, but don’t get why the manifold is hot on only one branch.
i checked all fuses and ok.
all injectors were completely reconditioned.
im at a bit of a loss as she started first time and although ran a bit rich and lumpy because of the race cam, she never failed to start and run.
Grateful in advance for any ideas, cheers Stu
updated: I realised maybe it should be in Q&A so I put it there.