Running on 4 cylinders

[grassy 4]

finnaly got my vr6 conversion started after 4 months of building it up but i noticed straight away that it had a bad misfire.

i felt the exhaust manifold pipes and you could tell that cylinders 1 and 3 are not firing as it was cold compared to the others.

 

i pulled out the spark plugs 1 and 3 and they are still clean and i pulled out spark plug 2 and you can see blackness from when it was running so cylinder 2 is fine.

 

the engine block is new with a full set of new pistons rings ect.

it is obd1 and i followed a guide for the firing order and have since then re checked it.

 

when building the engine i put in new spark plugs and a new dizzy cap.

im thinking the leads maybe knackered but i havent tested it yet to see if im getting a good enough spark.

ive ordered a full new set of leads to be sure as the ones i have arent the best condition anyways.

 

also i have a rotor arm on the way too.

if non of these seem to work what should i then look at doing.

test power at injectors 1 and 3

flow test them with the rest to see how they perform against each other.

compression test. but i would of thought a new engine will be at the best it can be.

 

is there anything else that could couse a misfire. ecu?

 

any help is greatly appreciated

 

[CALICO 130]

I would have thought maybe blocked injectors if the plugs were not wet when you took them out. Check for spark double check firing order maybe replace spark plugs too.

Edited April 25, 2014 by CALICO

[grassy 4]

I would have thought maybe blocked injectors if the plugs were not wet when you took them out. Check for spark double check firing order maybe replace spark plugs too.

i cant remember if they were wet now. i tried to sniff them if there was any fuel but ive got a cold so i couldnt smell anything. spark plugs are all brand new. ill be having a look over at the weekend to see if it sparking correctly.