col cos1

iTrader: (5)

yous might remember i posted up this fault my mates esco cos has got

wel its still not gone...so basically car has had this fault on and off for a while now(1=2 years)

the car when revved up to 4k it backfires like fuck,looses boost and cuts out.at 1 bar of boost

this was running stage 3+for running in new engine

tonight we put the greys in +msd closed loop chip and the boost must be set diffrent on this map as it doesnt come in as quick and now it revs to 5500 on only 10psi and does the same thing

we are at our wits ends with the thing

its been in a garage 3 times for this and still the same

all sensors,ecu changed except knock sensor and tps

there is a great spark,plenty fuel getting through,and all engine wiring inspected and part rewired


nightmare

m.rainbird,stu(msd)m.reyland,m shead.............help

Stu @ M Developments

iTrader: (12)

Still on P8?

rapidcossie

what did alan think it was?

col cos1

iTrader: (5)

no stu its on level 8 for some reason it must of been changed when it was reshelled

think he ordered chip from you for p8 but had to send it back for exchange mate

col cos1

iTrader: (5)

alan said he`d cured it,as a recuring fault,it was ok when the previous owner got it back but 100miles later it was back

sure alan changed alot of sensors,ecu etc,but it came back

col cos1

iTrader: (5)

im sure alan rewired part of loom aswell euan


frasers even bought a new ecu for it still no luck

thebigyin

you tryed it with a different exhaust? or no exhaust at all if you can without annoying the neighbours

thebigyin

the symptoms you describe dont totally say exhaust to me,but judging on what has already been done its got to be worth a go before wasting more time and cash,i have seen exhausts cause this kind of fault,even intermittently,strangely

Dan@Rapid-Ford

iTrader: (5)

Is the crank pully std or is it an aftermarket ally one?

col cos1

iTrader: (5)

crank pulley is standard

exhaust u think??

worth a try

Mark 3D

iTrader: (29)

my 3 door had a similiar issue.

as soon as the L8 ecu was fitted it was sorted.

Could you have a faulty ECU?

bud-weis

presuming that mechanically the car is sound ( which i'm sure it is ) then it definitely sounds electrical IMO...

Phil79

I know exactly what the problem is. I have had it with numerous cars in my time. It's all down to this at the front












simple fix, but a big step to do.



SELL IT

col cos1

iTrader: (5)

ecu been changed twice

col cos1

iTrader: (5)

yeah totally sound,this fault was there with old engine

now its got a new completly rebuilt diffrent speced engine

Mark 3D

iTrader: (29)

bugger!! cant be that then!!

i take it youve changed all the spark plugs and leads etc

TurboInsania

hello right i am colins pal that has this prob with this cossie and it is driving me crazy PLEASE HELP ANY BODY HAD THIS PROBLEM

TurboInsania

ye it has had leads the lot its such a weard fault as it only happens when the car is under load then u need to turn the car of and restart it and its perfect

pani_k

iTrader: (1)

something odd must be going on and dare i say it, it could be the ECU program. try re-programming it.

silky16v

iTrader: (1)

wiring to the map sensor

also common fault is the the multi plug still there in engine bay

also check main voltage to the ecu when the car is running and driving (do this by putting a volt meter to the correct pin-out on the ecu connector)

rapidcossie

fraz, its nothing to do with that funny fuel set up?

glancy2081

voltage at fuel pump,fuel filter partially blocked pressure

M7 COS

There's a post similar to this one in the Escort Cosworth forum.

TurboInsania

right ecu babyboard and chip all been changed the multiplugs av been cut out and hard wired plenty fuel and prob was there before external pump was fitted euan and i avnt got much hair left to pull out lol

ian sibbert

Fuel pump / gauze on the pickup or the fuel pressure reg....

I have had several that seem like an electrical fault and it turned out to be either

Fuel Pump Voltage/Wiring
Fuel Pressure Reg Diaphram usually.
Pick up on the fuel pump, most have some sort of gauze/strainer on the pickup which if partially blocked can give similar probs as you describe....

If you have exhausted all the other sensor/electrical avenues....

TurboInsania

give u an idea i got the car without an engine totally standard the car had this fault and when i picked up the car it was in the garrage for this fault and unfortunatly the engine let go when the garrage had it and since then has had a top spec rebuild external pump so on but u say the regulater that is 1 thing i aint actually looked in to maybe worth a nose

Stu @ M Developments

iTrader: (12)

Missfiring and losing boost actually suggest its losing fuel dramatically. It may well be that you have a fuel supply problem. Has anybody checked teh AFR whilst this problem is occuring?

Has anyone watched teh ECU datastream whilst this is occuring?

col cos1

iTrader: (5)

fraser defo get that pump changed asap mate

i know its not the fault as it done it before you changed it but it defo dont sound right

TurboInsania

right good news looks like it the middle wire on the throttle position switch.It has sucked up water by cappilary and its screwed the cable so the wire came out my hand when i checked it today, and when i hard wired the engine loom plugs beside the coil i noticed 1 wire was the same and its the same colour.So i might just replace that wire on its own but i dont no if it gos straight there any body shed sum light and thanks for the info today on the phone stu set dizzy up spot on

Turbosystems

iTrader: (5)

these cars are at least 10years old now the looms where never any good all cossies need a proper wiring loom such as pectel these are available and start at 550 +vat

TurboInsania

thanks for the info every body

col cos1

iTrader: (5)

update



new engine wiring loom fitted to car............................................... ...................its cured the fault and goes like f@ck



looking fwd to seeing what it will do on the rollers

col cos1

iTrader: (5)

was out in car tonight

first time ive been in a t38 equiped coss

doesnt half spin up fast

slight flat spot just as the boost comes in,good set up on the rollers at weekend hopefully

KSA-Cossie

iTrader: (4)

Nice one col.

glancy2081

glad to hear that the problem has been fixed

col cos1

iTrader: (5)

CHEERS GUYS WAS DEFO SOME KIND OF WIRING FAULT

NEIL A

iTrader: (6)

Who did he end up getting a loom from col and how hard was it to fit, might be worth thinking about.

KSA-Cossie

iTrader: (4)

Looms are a doddle to fit neil carlooms uk do them .

NEIL A

iTrader: (6)

Realy did think about it while the engine is out but , never had a problem with any of the wiring on my car and its only done 50K.Dont reay want to keep adding to ava's work list either as my spec has changed a few times since its been in.

col cos1

iTrader: (5)

neil he bought it off harvey gibbs i think,it was a standard one out a concours car £big note

it wasent as easy as it should of been i dont think due to some of the old loom being hard wired by someone else and things didint match up

but hes soldered and heat shrinked all of it etc and it seems to be fine