The engine was fine until I decided to change the clutch. I dropped the engine out and did a cleen up of the engine bay. Why did i change things?

I am not getting any spark on my S1.
The engine was running fine then the other day went to start it and it was running lumpy so I turned it off. I then tryed starting it again and got no spark. I know this as I have a clear dizzy cap.

I have checked the usual earths and leads but get good results.

I thought it was the dizzy but I got a scope on the leads and I was getting a trigger of about 5 volts, so went to the coil. I put a bulb on the green lead as suggested on other posts, It was on to start with but then when the engine was cranked it flashed but it was a dimmed flash. I then put the scope on the coil and agian I was getting a change on the green wire of about 1 volt.

I think it may be the ecu but not sure.

Can anyone help? Please!
I bought this as a run arround and my dad's getting pissed its not running!

 

For starters: BIN THE CLEAR DIZZY CAP

 

 

What????

 

[b]WHY????????

Hi there can you help Im licoln Danny's mate and we need a turbo to run around in as we keep getting bad looks when we are driving around in our transits!!!!

 

Clear dizzy caps are shit they are known for causing problems!

That was me Danny rang before, when he put his ECU on your car and then threw a tantrum cos hes a muppet and squashed the vacuum pipe on his car so it wouldnt boost up lol

 

I will try removing it tomorrow but have you any other ideas if not?

The last time it was the earth near the wiper motor but that is fine now!
It was funny though when he squashed the pipe.

Every time I went to his house he was always like this with his turbo. Now he has got me doing the same!!

 

It can't be the ECU, you tried Danny's we know his works

He was in a right mood until i suggested have a check around for losse/squashed pipes etc.

Hormonal slag

 

ok andy
old wise one

 

HI ROB V

Have you any ideas or are just in here to wind people up?

 

have you tried a diferent dizzy or coil?

check inside the dizzy that the wires arnt broke inside

the green wire on the coil is an earth and goes toyour rev counter

the black wire is the live

 

it bumped ur thread didnt it

 

Hi
I have changed the coil, but made no change. The rev counter is moving about 500rpm and there is a 12 volt supply to the coil.

When I checked the dizzy on the scope I was getting a good wave on the screen but it was only about 5 volts change.

Do you know if it should be more?

 

have you changed the coil

no spark can only only be doen to a few things

coil
coil wiring
leads
dizzy
dizzy wiring
plugs

if you have changed and checked all tese then theres something very wrong

 

There is no spark at drzzy cap.

Tryed a spark plug straight in to the coil and got a little spark.

All wires seem to test ok!

Its just the voltage change on the trigger to the coil that i dont thinks right!

 

Im sure Danny said the spark was very irregular when he rang me that time, is that correct?

 

last time we got a small spark now and again. We put this down to the earth lead we left off eathing now and again.

 

Unlikely IMO.

Have you tried another dizzy? Did you try Danny's IIRC?

 

we did but that did nothing. then we put the earth on that we left off and everthing worked fine.

The engine has been running for a while in the workshop.
then it went lumpy one day so I turned it off and it wouldnt re start.

 

So have you actually got a spark now

 

no

 

dont forget a coil will only fire once not continusly

change teh coil

and go from there

 

Yes I know. If you read the post, I have had a scope on the leads to watch what happens over a period of time.

I have changed to coil it made no change.

The dizzy seams to work but only a small voltage comes out and then the ecu wire to the coil sends a signal which is even smaller.

 

you should get 5 v from the dizzy. The green wire is grounded to by the ECU. There should be 12 volt square wave across the coil leads while cranking. If not, then the ecu or loom is shagged.

 

Thanks

I will get the scope on it again tomorrow. I did think it was the ecu but i hoped it wasnt.

 

but you have tried a ecu that works though

id check the coil wiring trace it back and check for continuty to make sure theres no breaks in the wires

you could have possibly damaged a wire when you removed the engine

 

check the coil wires by the intercooler as they chafe through my s1 did this run spot on then started missing then cleared lucky i found it a home

 

As i have already said, you have used a known working ECU on your car, you refitted it back to danny's car after, and his car ran......ECU eliminated from the equation!

 

I ran a new wire to check ecu working and no change

so to recap

dizzy works
new coil
wires test fine

 

Maybe there are other wiring faults then, maybe for instance the ECU isn't getting a good power supply, because if danny's ECU did the same thing as yours, its clearly not the ECU.

 

We believe this is another problem as we solved the last one. Danny's just got a new ecu so i will have to try that just to make sure.

 

I put on a different ecu and I got a spark but it didn't start.
It did fire fire on one cylinder, so i put this down to the different colour code on the ecu.

Have got the correct one now so i guess i will try this.

Does anyone know:

If i take out my old chip will it work the same without a setup in the new ecu?

 

For the final time, you tried a working ECU off dannys car, it didnt solve your problem, it was then refitted to his car which continued to run.

IT IS NOT AN ECU FAULT!

 

Right, ash is haveing some probs getting a message across here-months and months ago, we couldnt get his car to start after a clutch change.After changeing ECU's etc we traced the fault down to the ecu earth near the wiper motor not being bolted down-simple fix but was easily overlooked.
anyway, a long time since, ash finally got a few last jobs done and booked it in for an MOT. The night before he goes to start the car and it runs really lumpy so he switches off the car.It now doesnt run or even start.This time we havent swapped anything on from my car, simply becuase i sold it months ago! he has swapped an ecu for a spare one i have lieing around, but it is of an unknon quantity. Please help the guy out, hes dieing to drive it again and get his old man off of his back

 

Trying to help as best i can, but i find it unllikely an ECU goes faulty in a dormant car, or that a replacement one causes the same fault conditions. The colour codes bare no relevance as far as starting the car and letting it idle goes.

Have you checked for the usual air leaks, if the flap moves when you crank it, if fuel sprays from the injectors with the fuel pump running and the flap pushed down, etc etc etc

 

he has, but going to pop over 1 night next week and double check everything again

 

It'll be something silly, always is on MFI cars doesnt take much to upset them!

 

Got an hour before meeting danny in morning so i will check fuel system again and new ecu.

 

im having simular problem on my mfi unit on my s2 ive changed all spark plugs and ht leads dissy cap etc mine now starts but once it gets to normal running temp and i turn it off it starts up again but idles at 250 300 rpm and is really lumpy and doesnt wanna pick up speed people have told me it could be the esc (electronic Spark Control) dunno if a S1 has this hope this can help mate i no how frustrating it is and also having someone on ya back 24-7 lol good luck

 

They all have the same ignition system.

So what happens if you rev it? Does it clear up?