Injector wiring loom

[MisterTee]

Morning all

Don’t suppose anyone has a decent injector wiring loom going spare for a non cat car?

Andy

[GreenV8S]

What engine?

[MisterTee]

Oh yeah, sorry, that might be helpful ....

2.9 Ford

[RayTVR]

Hi Andy,

Do you know if its definitely the loom at fault? I have a 'star tester' box which can be useful for doing a wiggle test to help isolate intermittent connections which you'd be welcome to borrow

[sebackman]

I think i have one. Will check to torrow.

[MisterTee]

Thanks Ray

I might just take you up on your offer. I’ve just had the engine and gearbox rebuilt and whilst the car was in bits, I had a new injector loom made. Since the rebuild the cold start has stopped working, and I wondered whether it was a problem with the loom? Also the car ran perfectly (once warm) on the rolling road for over two hours, but has since developed a misfire, now I’ve got it home!

Going to change the dizzy cap, rotor arm and ht leads in the hope that will cure the misfire, but still a bit baffled by the cold start issue.

Andy

[RayTVR]

MisterTee said:

I might just take you up on your offer.

Just let me know - I'm near Durham so I think in your part of the world.

[Penelope Stopit]

RayTVR said:

Hi Andy,

Do you know if its definitely the loom at fault? I have a 'star tester' box which can be useful for doing a wiggle test to help isolate intermittent connections which you'd be welcome to borrow

This is the way forward
You could make a test lamp using a 60 Watt headlamp bulb which will draw 5 Amps through a circuit

• *Disconnect Injectors and ECU so as not to burn anything out***

Supply injector cables (or any other circuits cables) with a fused positive and earth their other ends through the 60 Watt test lamp bulb, you should get a fully illuminated bulb and can even measure the voltage with a multimeter while the cables are under the 5 Amp load

Most good/new injectors will draw less than 1 Amp and I doubt any good/new injectors will draw 2 Amps or more

If the loom you are using is breaking down when carrying less than 1 Amp injector current, the loom will definitely break down when attempting to carry 5 Amps test lamp current

Good luck in finding the fault.....they're a pain

[hoppo4.2]

ill have one in my collection of crap if it turns out you need one

[MisterTee]

Many thanks

Not getting anywhere near the car this week due to work, but will get back to you and RayTVR next week (hopefully)

Andy

[sebackman]

Hi,

Checked the garage and I can't find the wire loom.

Probably gave it away before, or have lost it.

Sorry

[MisterTee]

No worries, thanks for checking.

Andy

[GreenV8S]

MisterTee said:

Thanks Ray

I might just take you up on your offer. I’ve just had the engine and gearbox rebuilt and whilst the car was in bits, I had a new injector loom made. Since the rebuild the cold start has stopped working, and I wondered whether it was a problem with the loom? Also the car ran perfectly (once warm) on the rolling road for over two hours, but has since developed a misfire, now I’ve got it home!

A new loom seems like a rather drastic solution to that. Wouldn't it be better to prove whether the loom you have is faulty? Given that new looms are apparently not easy to come by, you could consider fix the fault too, if you find one.

[MisterTee]

I appreciate that I do need to do some investigative work, but just haven’t had the time this week to get near the car.

I’m sure I will get it sorted, but when thinking it through the loom was the only thing different, electronically, that has changed since I had the engine rebuilt which is what made me doubt the loom.

[phillpot]

Knew I'd have one somewhere if I looked hard enough

[RayTVR]

Also have an injector loom if you need it..

[RayTVR]

Did you ever get this resolved?

[MisterTee]

Morning Ray

A combination of work, lack of time and just being a bit fed up with it all has led to little investigation on this.

Been and had a poke about this morning and the full near side bank of cylinders are not firing at all. Whipped the plugs out and gave them a clean, but no different.

Might have to borrow your tester if the offer is still there? (You have mail!).

Any other ideas on this really welcomed? Could it be a timing thing?

Cheers

Andy

[GreenV8S]

MisterTee said:

Been and had a poke about this morning and the full near side bank of cylinders are not firing at all.

An electrical fault on the injector driver circuit would fit those symptoms exactly.

I'd check whether you are getting power to the injectors and whether the ECU is grounding them. You could also measure the overall circuit resistance from the ECU connector to see how many injectors are actually connected.

[MisterTee]

Hmm, thanks for that.

That makes me even more suspicious about the injector loom - as I say, that is the only thing different from a wiring/electronic perspective.