RAT8OY

Hi there,

I have a zetec turbo running a T6 pectel. I curently have a problem with the crank position sensor which is mounted above the starter and reads off the flywheel through the block. This is a standard Mondeo set up and sensor as Ford would of supplied.

The problem is that the sensor is being knocked out by interference from the starter during cranking. The ECU is picking up on this and is killing the sensor off. I have made an aluminum cover over the starter and have had a sheilded cable made up to the sensor.

Apparently this was a problem with some Fords back in the day hence the sarter now being mounted on the back of the block.

Did Ford ever develop a cure to this or does anybody know enough about T6's to tell it to behave? We have tried changing the voltages to the sensor which has helped but not solved it. The sensor has been tested and is shown to be triggering fine. The ecu will allow it to fire once and then kills it!

£3000 quids worth of loom and ECU and I get this! Fucking thing!

pee vee

hmmm. the wire to the crank sensor is shielded type, right?
and earthed at the ecu end?
sure its the starter motor and not something else a bit close to it like ignition leads passing close to the crank sensor wire.

RAT8OY

Runs a standard Ford coilpack and leads above the rocker cover so not close enough. We had this problem on the dyno and it was becoming a right pain in the arse to start as it would only catch now and again. I was assured it was the starter as it runs fine when the starter is off. I was also assured it wouldnt be a problem in the car!

I like your thinking though! I will have another ganders to see if there is anything else close buy!

Big Will_

The wire to the crank sensor needs to be a twisted pair with earthed shielding mate. Is your shield definitely earthed correctly?

RAT8OY

Hi Will,

Yep tried the wire rap trick and it didnt work so spot from harness engineering who made the loom went home and made up a proper sheilded cable with its own earth which still didnt work!

zetaboostboy522bhp

hi mate ian had problems with his old t2 looms , as he said they just would nt fire in car and on the dyno. i build electrical control panels that use plc equipment and we use alot screen cables etc .
the problem is defo interference , so when i built mine i use my screen cable from work and do both crank and cam, its a twisted pair with a aluminium foil with a twisted screen sheild . it needs the twisted pair on the crank plug end and at the ecu end the screen sheild must be connected to a engine ground on the ecu plug , so far no problems with them starting. it must only be screened at the ecu side and not both as this causes an internal interference loop.

p.s just a quick idea wrap foil around the cable next to the starter motor , if you still have trouble give us a p.m and i will send you some cable and some pins you can have some cable but you will have to pay for the plugs and pins only about £20

Martin-Hadland

iTrader: (2)

Wierd problem, I have never had this. We have a Zetec in right now on T2 and its all fine.

RAT8OY

Hi Paul!,

I dont know why I never thought to give you a call when we were having the problems on Saturday. I think I follow what your saying mate and I will pass this info over to spot to make sure he has done al you suggest! I will try the foil idea tomorrow after work! Thanks mate!

Got to tell you that when she does run she sounds fuckin awesome and VERY aggressive! Cant say the neighbours are as happy as me about it though!!

zetaboostboy522bhp

fook the neighbours bud boost it and let everyone know danny boys on the road!

as i only do the t2 loom i have never looked at the t6 to be honest but as i said ian used to have problems now he dosent! when i spoke to ahmed i remember him saying that everything is mapped from the crank sensor and the cam is rendered useless on the t2 so it must be the same on the t6 so its a very delicate peice of wiring.
when you say he made a proper screen was that a twisted pair of single cables with a single earth or a proper twisted shielded screened pair?

RAT8OY

I am not to sure mate! I will ask him that exact question tomoz! I would imagine the T6 and T2 are identical with respect to the crank sensor end!

If you have solved the problem for Ian then I know you obviously have the answer! I will see what spot says and will let you know if I need some cable off you!

Cheers again buddy!

zetaboostboy522bhp

no probs mate just let me know if you need any help

Martin-Hadland

iTrader: (2)

Both T2 & T6 use the cam sensor to run sequential injection (720 sync), disconnect the cam sensor and both trip into 360 sync.

zetaboostboy522bhp

hi mate i certainly aint no mapping expert and i know you will know more about this than most , i have just got a question which you might be able to help me with if you would . when my engine was on the dyno it was coming out of sync i think so we had to space the cam sensor off with some washers and now has the end off the inlet cam machined off why is this cheers paul

Martin-Hadland

iTrader: (2)

I would guess that the washers were used to gap the sensor correctly for dyno use and the trigger was machined afterwards to do the job right (no washers).

Rascal Turbo

The non start issue with Ratboys setup was the engine loom was designed to work with a Pectel T6 , Ratboys ECU was / is a T6 2000 , the crank and cam reference pin on the 2000 is not the same as an old spec T6.
Moving the reference ground to the correct reference pin solves the starting concern.

spot

XRT_si

iTrader: (2)

Thought of using a rear starter MTX as a back up plan?

GARETH T

if all else fails,,,,, use a crank pulley the timing marks on it?

gup

iTrader: (1)

are you using the standard zetec starter motor fella
as when i converted my diesal van to a petrol turbo (fiesta turbo management ofac)
i had a similer proplem that it would take ages to start and then i found out that it was the diesel starter motor that uses a pulsing signal when cranking and this was interfering with my crank senser
i put the fiesta turbo starter motor on and its been good as goldd