right where do i start i have a misfire on my rs 2.1 zetec i have found out what it is there is no fuel getting to the 4th injector an only this one i thought it maybe the injector itself so moved it to number 1 but works fine there an number 4 again getting no fuel i know this as when i unplug them one at a time this is the only one that doesnt cut the engine an other 3 do has anyone got any idea why im getting no fuel to it cheers

 

Fuel blockinge in the rail

 

Sounds like the wiring to injector plug 4 has failed mate.

 

To test this take the injector out and prime the fuel pump to see if fuel comes out the hole in the fuel rail.

 

goes without saying make sure the engines not hot when you do this lol

 

hahaha yes, well worth pointing out!!

 

Fuel comes out of the hole fine just not getting through injector

 

must be the wiring then

 

I've checked the injector loom up to the plug an no cuts at all

 

That doesnt mean there is no internal break mate, do continuity test from as far back in the loom as you can to the injector plug.

 

It could be an injector driver, so the wiring may still test out ok, but still not work.

 

No it couldnt mate, they batch fire so if a driver was dead two injectors would fail.

 

doesnt 1 an 4 injector use same wire could i not just run 2 wires from injector 1 to 4 to see if that works

 

Hi mate,

There will be two wires from the ecu to the multiplug on the injector loom, the injector loom then has four wires going to the injectors.

1&4 are joined
2&3 are joined

each plug should have 12v on one pin when the ignition is on, the other pin should buzz through to the joined injector connector....

So 2&3 will buzz through, as will 1&4 if the wiring is fine.

My money is bang on a broken wire, mine did the same.

 

As Karlos says, if the wire was broken before the multiplug two injectors wouldn't be firing, same with an injector driver fault.

The fact that its only one injector singles the injector loom as being at fault.

Rob,

 

That's a point! Lol!

 

right have fuel getting to the injetor but still when i have that plug off it doesnt change the note of the engine could it now be there is no spark that that side?

 

well i have sorted it out runs like a dream now turned out to be my new denso spark plugs they sit to far down an the ht leads was touching right so put old plug back in an all is well only thing is the plugs i bought are denso itv27 as thats what i was told to fit so how can i get them to fit

 

That really doesn't sound possible if I'm honest, so your saying that the ignition lead doesn't click over the spark plug properly? As I'm pretty sure the top of the plugs, (the bit that is on the outside of the head) are normally all the same length, it's just the depth of which it enters the chamber differs!

 

My old plugs are longer then my new ones an wasnt clicking on properly

 

The test you have done does NOT indicate no fuel, it just indicates that there is no power being produced by that cylinder, check your spark plugs first, then do a compression test followed by a leak down test if the comp test shows poor results.

The answer to these tests will finalise wether you have injector problems or not.

 

its all sorted now mate cheers