abdr500

iTrader: (1)

fuel injectors in what way do they go faulty . can one just shut down and pick up again under load and the same with ignition leads they ether work or not .like a piece of wire would that be correct so muy question is
1 can injectors shut down because 1 is faulty under load
2 ignition leads can 1 be braking down but still run on 4 but under load 3

Doug

Dont think they can just shut down unless blocked or communication fault via ecu but they can dribble or spray pattern alter thus causing melty melty



Regards Doug.

abdr500

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Doug

What's the fault you are experiencing ? .

abdr500

iTrader: (1)

Doug
i put my foot down in 1st and it boost up but it starts to miss so i back off park up and its still missing for around 10 seconds then its back on all 4 it does it in 2nd gear to but in all other gears its fine no miss at all :?

abdr500

iTrader: (1)

i can only put it down to injectors as fuel presure is fine pump is good spark plugs are new leads are shit magnicore . but dont miss a beat up top but only low down .when it starts to miss it will do it for 10 seconds its number 3 that i have pin pointed it to must be dodgy injectors i am going to swap injector round to see if fault moves into the other cylinder

Doug

Only 1st and 2nd hmmmmmm Cant be a plug gap/lead fault as the engine is not realy generating any immense torque or load in those gears and will not really blow the spark out but no doubt I will be corrected

have you checked the fueling / co hc readings and have you had the car on a pectel monitor to check that all your sensors are working correctly as this would be a good start ?


p.s. what injectors are you on 803's 403's ?



Regards Doug .

abdr500

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light blues i have a fuel presure gauge under the bonnet and when its starts to miss i dont see any fuel presure drop at all i have a new crank sensor i re gaped the phase sensor and new tps and plugs map sensor is 1 year old chip was a paul hills one had the fueling cheacked 4 weeks ago with paul hill and said it was spot on but 1st and 2nd still the same ..i did see that my turbo exshsut wheel had turned a white colour

Doug

What gap on the crank sensor ?
what gap on the phase sensor ? also on your phase are any of the 2 wires bare or corroded ?

also on your phase have you had it set have you done a full sweep test with a multi meter ?


Regards Doug .

abdr500

iTrader: (1)

crank .06
phase 0.3 was new 1 year ago and looked mint no corosion or bear wire
plug gap .6

Doug

What plugs? 071c's ? champs ? 57s 59s ? motorcraft 902's ?if you have motorcraft 0912's bin them should really / idealy be 0.65

abdr500

iTrader: (1)

071c's.... i cant see it being the leads as they wound be worse in all other gears i would bet on injector but will have to see when i swap it round to another cylinder

Doug

Won't be that then

I would personally go down the route of a pectel monitor test first make sure all the sensors are working correctly and check the fueling etc via a wide band test your local mapper should be able to carry out these checks for you .



Regards Doug .

abdr500

iTrader: (1)

Doug
i have sort of coverd most of the sensors with new ones i am that close to finding the fault .would the monitors mike rainbird is seling pick up the fault

Doug

Are they the sec's stuff ? not really sure as I have not had a lot of experience with them ?



Regards Doug .

abdr500

iTrader: (1)

Doug
yea ther the one o well i am very great full for all of your replys m8

Doug

Your welcome mate go down the route of a pectel monitor and wide band test first that will ellimanate a hell of a lot and may well pick up a fault in the prosses which will be a bonus .



Regards Doug .

Fiecos Dan

i would say possible Tps or map sensor error,

But as doug, try a monitor on your car,

foreigneRS

you do well to watch a fuel pressure gauge under your bonnet and drive flat out in first gear as well

abdr500

iTrader: (1)

a update to my problem i have changed injectors round to see if it move fault over to the next cylinder but still same i have change plugs aswell and changed cap and leads round but when it starts to miss it will only be cylinder 3 and its not plug leads or injector that i can see but when i its starts to miss if i switch it off and re starts the car its fine but if left running it will be for around 10m seconds

Fiecos Dan

Have you tried a compression test?

abdr500

iTrader: (1)

fiesta cossie
will try that now but it dont miss a beat on ideal 3rd 4rth or 5th flat out and i run 2 bar. it will only miss if i am in 1st or 2nd and flat out but will miss for around 10 seconds and away i go ther no smoke rattel at alll

abdr500

iTrader: (1)

compression is good in the suspect cylinder all 4 cylindersl show the same
?? now what

Fiecos Dan

Have you got spare TPS, map, tdc sensors available?

or a kind mate with cossie, that will let you swop the bits?

abdr500

iTrader: (1)

yes so far i have replaced map sensor leads plugs i have a new tps fitted and a coolant temp sensor and still .

Fiecos Dan

Have you tried swapping them, or as they are newish, you've thought they will fine?

abdr500

iTrader: (1)

swaped them over but the tps was new but every thing else come of a working car .i can only put it down to ecu or chip my fuel presure gauge goes to 0 when i switch of the car is tha normal the fuel presure on idel is 3.2 bar wih th vacume pipe on and 3.8 bar with it off

Fiecos Dan

Fuel pressure shouldn't drop, unless the one valve on the pump has been removed or faulty, or there is a pressure leak after this valve.

But my fiecos hasn't got a one way valve fitted, the only problem with that, is it dont start straight away, it turns over till the fuel pump build the pressure up (less than 5 seconds cranking)

abdr500

iTrader: (1)

fiesta cossie
so if i had the car running for 5 mins and switched it off ther should still be fuel presure ther ?

Fiecos Dan

No, on my fiecos, as soon as i turn off the engine the fuel pressure will drop to 0psi in seconds.

Thats going off a fuel pressure gauge fitted between reg and fuel rail.

Fiecos Dan

Ok i under stand the fault,

Misses only on full throttle 1st and 2nd gear, and then misses for 10 seconds after you back off.


Wot have you changed to try and sort it, since it last run ok?

Map, Tps, Act, coolant, phase, ecu, loom, cap and arm, plugs, leads.????



Wot boost is it happening at? tried turning it down ?

Fiecos Dan

Wot fuel are you running?

Wot spec is your car?

abdr500

iTrader: (1)

fiesta cossie
ok light blue injectors 3 bar t34 68 /34 and bleed valve 500 intercooler rebuilt engine 071c plugs gaped to .6 phase sensor gaped to .2 crank pully alloy with steel pick ups fuel presure 3.3 bar idel magnicore leads l6 ecu verner pully and a paul hills mapped chip optimax fuel and i run 2 bar boost and hold 1.8 bar it will miss on full load in 1st and 2nd gear but will not miss at all in all other gears and when it starts to miss it will go on for around 10 seconds .it will some times hit 2 bar in 2nd gear but some time it gets to 1.5 bar and starts to miss and i back off if i turn boost down it wount do it but it was set to run 1.8 bar and hold if i turn it down it ok
this is what i have changed to try and fix fault
map sensor coolant temp sensor tps is new 4 weeks ago and act was new to adjusted phase sensor adjusted tdc sensor all are not that old and look mint but changed plugs leads cap arm swaped round the injectors to see if it move problem into other cylinder as number 3 is what giveing the problem comprsion test was good just like other now i am stuck ecu and chip left

Fiecos Dan

How do you know its No 3 cyclinder?


Check phase sensor and crank sensor's resistance.

By using ohms setting on a volt meter, first try it on the sensor wires them selves, should be 600-900 ohms, if thats ok, do it on the ecu plug terminals, should get same result.

Sounds the same problem of a 2wd cossie i saw at the pod a few times last year.

Has it ever run with out this problem?

abdr500

iTrader: (1)

fiesta cossie
yes was all right before .i know its no 3 cylinder as when it starts to miss i get out the car and un plug the injector plug and it make no differnce oh buy the way its a big turbo escort cossy but witha l6 ecu in it and it rwd

Fiecos Dan

How about boost pipe to reg, Any splits?

have you tried another fuel pump, reg?

i know you sed your got pressure, but your gauge is not visable in car,

so try moving it into car. so you can watch it.

abdr500

iTrader: (1)

fiesta cossie
fuel pump gives 1.5 liters evey 30 seconds so in 1 min it i am getting 3 litters fuel regulator is a suspect but vacume pipe to it is new and not split moving the gauge to inside the car will be a littel hard will have to make a pipe to fit back in to the car what about igntion amp could this cause it .it sounds like i am blowing the spark out

Fiecos Dan

Yeah sorry,

Try coil, and amp.





Wot pressure is the pump doin 3 ltr/min?

When you test it, the engines got to be running, so you have full 13.5+ volts at pump.

you need to check it at say 3 bar, and 6 bar

on a 400bhp cossie pump you should see,
@ 3 bar about 3.5-3.8 ltr/min (this shows there's no restrictions on max flow)
@ 6 bar about 2.25 - 2.5 ltr/min minimum really.

on my set up, with a 044 pump, @ 3bar i get 4.7 - 4.8 ltr/min @ 13.8 volts at pump,
and @ 6 bar i get 4.1 - 4.2 ltr/min which is good for over 600 bhp.

abdr500

iTrader: (1)

problem sorted a big thank you to DOUG and FIESTA cossie for ther friendly advice

Mike Rainbird

iTrader: (3)

So what was it then?