problum urgent help needed seam's to be week spark from coil

[lee_capri]

have no power going to my coil,injection,

 

v8 injection system type with big silver box

 

any-idea's,or can i by pass this and run a straight live feed i or so have a ecu,

[styut]

Completely different set up, but when I had no power to my coil it was because the connections to the rev counter had corroded. The rev counter completes the circuit, hence no power. Once I cleaned up the connections it fired up straight away (took me 4 hours to suss that one out though..!)

[lee_capri]

would that also be the same if the clock's are not fitted any-one

[caprinerd]

mate any chance you could put up a pic of the unit you need as i have a few bits here now and if i have one i`ll sort out away to get it over to you

[lee_capri]

mate any chance you could put up a pic of the unit you need as i have a few bits here now and if i have one i`ll sort out away to get it over to you

 

would help if i knew what was wroung

[Savvi]

I've just wired a V8 up for someone and we fed the coil from the ignition switch or if you have the old loom in use the original wire.

 

There was a fly lead coming out of the Ecu which had

 

white/red x2 = ignition cranking starter wire from switch

Brown = 12v live

White/ grey x 2 = 12v ignition feed

and another which was a feed out for the fuel pump.

 

That may help ?

[lee_capri]

my lume is all ready done savvi and worked perfect befor i took it all out

 

have also tryed running a direct live feeed to the cool and still get nelt,have also fitted the clock's and still no change,

 

but if i run a live and a earth from battery on the floor i get a week spark have gone round checked all the earth's and added some but no improvement's have tryed differant coil's ect and still nelt,

 

it's some thing so f**king simple it is pi**ing me off now been on it about 5 hr's scratching me head ive got no hair left

[lee_capri]

still ahv'nt got this sorted folk's checked all the wireing,put brand new coil on and still nelt

 

 

how do you wire a coil from the battery to a flicky swith and putting the - on the earth side of battery,to run distrubtor with a set of point's please

[bortaf]

The coil should just have an ign live surely? the dist/points earth it out to charge/fire it not the rev counter so if you run a live to the coil and it's not firing i'd be looking at the dist or ign modual ?

[lee_capri]

im not getting any-thing out of the coill,have,nt got it conected to the cap need to get power to coil befor i can transfer it to the cap

[styut]

Is there actually 12v going into the rev counter when the ignition is on?.

[bortaf]

So you have 12V at the coil yes but no spark?

If you have no power TO the coil it wont fire, run a lead straight from the battery to the pos side then you HAVE to have power to the coil, if you still dont the wire is broken?

Theres a differaqnce between not having 12v at the coil and the coil just not working?? which one is it ?

If it dont fire and ther is 12V at the pos side it's cos of something on the neg side not triggering it (dist, ign modual, points dirty ect).

 

Sorry a bit confused you say org theres no power getting to the coil, thats a loom/ign switch fault nowt to do with the coil or anything else, coils are allways live fed and are trigged by switching the earth?

[lee_capri]

there's no power getting to the coil the live is dead

[lee_capri]

right ive done electrical test thingy on the wire,and their is power,also checked the wireing is all correct which is,also ran heaver wire to me battery,

 

coil work's on anouther motor

 

any-idea's has im confussed to why it int fireing

[Supercharged Nat]

does it have an ignition modual? it could be that up the shoot.

 

im not 100% on your ignition setup are you running a dizzy? is so does it have points? if the coil works on another engine, and you have all your wiring correct and all the wires upto the coil are working correctly then id say you have a problem after your coil.

[lee_capri]

right ive had it with it now poxy thing,

 

osf need asap plase one that go's

[sitting_budda]

you mentioned that the clocks arent plugged in.... have you tried plugging these back in?

 

In my escort if the rev counter isnt connected then it wont start...

[lee_capri]

no it's not that either all bcak together im all out of trick's even rewired it all last night has only 4 wire's to run the lot and still nelt,

 

 

 

so if any-one has fresh idea's would be help full,power to the coil but what is comeing out of coil is to week to do ant-thing with i can stand thei and hold the ht lead very easy with out getting such a belt,

 

the power going down the ht lead to the plug lead is their but is also to week to do any-thing,dont even get a spark but do get a reading on electrail tester,

 

coil is good ht lead is also good has taken off a land rover which is on the button,

 

 

has ive said if you cant get the power to come out of the coil the way it is spose to it wont start in a month of sunday's

 

 

 

so like i said osf needed urgent

[sitting_budda]

Based on an mg but should be the same troubleshooting principals...

 

http://www.vord.net/cars/helga/hot-starting-problems.html

 

Hot starting and weak sparks

 

The traditional method of removing a spark plug from the engine, earthing the end and connecting an ignition lead is not a good test. It is much easier for a spark plug to spark in the air than in the engine. The air gets less conductive when the air is compressed (as in a cylinder) and even less conductive when you add a little fuel into the mix. That's why cars with weak sparks are prone to flooding. Once the air is heated (hot starting) it becomes even less conductive.

 

A better technique for diagnosing hot starting problems is to turn the engine over with a ignition timing strobe attached to check for a spark. It's a real test of whether the spark plug is sparking under real conditions.

 

Mine wasn't sparking when hot. It would spark if I removed the plug from the engine. Diagnosis weak spark. They are the worst to diagnose.

 

There are many possible causes for a weak spark. Poor connections in the system, poor coil, worn points, low battery voltage, excessive starter current drain, too much fuel in the engine, engine too hot, etc. One very common one for cars with points is a bad earth in the distributor base plate.

 

My MGA has a ballasted coil. The coil operates on 6V as standard, the voltage being reduced with a ballast resistor. The reason for this is the starter motor takes so much power on starting that the voltage supply drops causing a weak spark. That's the last thing you would want on starting. So with a ballasted system the starter solenoid provides a temporary 12V supply to the coil while the starter is turning and gives the spark a boost.

 

On the MGA the starter solenoid turned out to be faulty - it wasn't supplying the boost to the coil, so the spark was weak enough to be overcome by all the adverse factors I mentioned.

 

My temporary fix was to wire a 12V boost through a switch on the dashboard. Longer term I'll need a new starter solenoid.

[sitting_budda]

Also worth a read

 

http://www.hotrodders.com/forum/weak-spark-off-coil-154184.html

[lee_capri]

it's a efi mate and was all working fine when removed from car,iahve done all that one can think off,

 

it's getting re-wire again later with out the injection system and any-thing elctronic and it should go

[Supercharged Nat]

is it taking its power from the ballast wire in the cars loom? some igntion systems need 12v feed from a live. most capris have a ballast resistor in the loom which knocks the suppy down to 9 volts.

[lee_capri]

im pretty sur i dont have one im going to get anouther lume for it possable,has have plenty of time to get it sorted has i have a car i can race now

[bortaf]

Just for testing run a live direct from the battery to the coil tha tway you deffo know it's getting 12 not 9V but i think you already tried that?

[lee_capri]

Just for testing run a live direct from the battery to the coil tha tway you deffo know it's getting 12 not 9V but i think you already tried that?

 

i have mate it's even got stueball bafeled and he has done the same conversion has me after seeing mine,have even put a brand new coil on it today, and still no go,

 

i and my mate has well has you guy's have been scratching our head's all week with it,

 

i really dont know what is wroung,ive put more eart's on ran beteer wire to the boot were batery is,ive checked all the wireing comeing off my barrel,checked the ecu is all wired up propley which is 4 wire'a cant go wroung,my coil is drawing 12 volt's,it's belt's hav been destubed,and like i said it ran perfect in the other car started on the button has it all came out of my old v8 cappa the lume and every thing,i really dont understand it any-more,

 

i feel like kicking f**k out of it was supose to be painting it this week and testing it getting it back on the road,