MK2 COSWORTH

finally after all the help and support on my last thread i think ive found the fault on my car i have been through the full car as stated in previous thread and i have come to find that the no3 injector is clicking twice as fast as the other 3??? i have same comp on all 4 cylinders i have a spark as when driven above 2-3000 it seems to clear (boost looped 1bar)(normally 2.5) but on idle runs on 3 the plug soaks straight away i can only put this down to a wire fault as swaping injectors over made no difference and no 3 still sounded to click much faster than the rest?? i had a noid test done and all seemed to flash the same???? i am very puzzled i have 12v ign on and around 7v when car is running by quickly bridging the plug with m/meter?? can anyone help

Alvyn

iTrader: (1)

it deffo is the injector wire plug on number 3 not the iscv wire??

david 100

I made that mistake after having the head of my 3 door, got the iscv plug on number 2 injector and number 2 injector plug on the iscv, easy done.

Fezman1

iTrader: (1)

Yeah, was gona say, i made this mistake once- couldnt figure it out for ages

daz1968

Could you not remove the injector rail and hold it over 4 measuring cups and get someone to crank the engine over, with coil disconnected, this would see if all injectors flowing same amount of fuel, as if it's flowing a lot more I would think it would be evident after a couple of cranks. At least this would help confirm if it's injecting to much, then you would have a better idea what to investigate next. Just don't smoke at the same time

Darren

MK2 COSWORTH

thanks for replys folks i had to go for a sleep my head s burst tyring to sort this the plugs are defo the correct way as its a recent loom with all wires labelled in white tags no3 injector defo seems it clicks faster than the rest??? i will give that a go and see what amount they each spray daz thanks

daz1968

No probs, hopefully will either prove or disprove your theory, I had a few issues with mine a couple of years ago but mine wouldn't start, all the usual stuff didn't seem to work but was determined to find it, think I swapped and tested everything before I managed to start it, mine ended up being a combination of phase sensor, the gap,bit of play in the distributor and out a bit on phase sensor to crank sensor timing, but took ages to find it as it drives you round the bend trying

Good luck if it runs are you going to central day, if so not much time left to mess

MK2 COSWORTH

im on a mission to find some form of measuring cups tomorrow its a good idea that will defo help i would love to make it to central day but dont think car will be ready

daz1968

I would try some of the small drinks cups that are clear like you get from the water drinking machines, easy to spot the levels then and big enough to hopefully stop petrol missing them, if possible stick 4 to a piece of wood to make holding them easier, not sure if they ok as can't remember what the spacingis between injectors, but if one is shooting a lot more fuel than the others should be easy to spot, might be a better way to test it but I can't think of one.

MK2 COSWORTH

no your right daz this should defo show if it is the problem ive looked out 4 glasses which i think will be suitable il turn it over see what results i get in the morning

MK2 COSWORTH

right tired spraying the injectors into 4 glasses 3 and 4 gave the exact same amount? 3 being the problem cylinder th front two bout half ml out.. but there was some spray around that area so that cant be the problem?? i put car back together started it an it seemed to clear for a second??? i took it a drive and it just bogged down again onto 3cy?? im off to get another fuel reg as i noticed a 3dr thread with similar problems to mine :~(

Turbosystems

iTrader: (5)

the regulator diaphragms can split and allow fuel to be drawn in through the vac pipe into the inlet manifold
you can test this my checking the regulator holds vacuum

MK2 COSWORTH

i have nothing at hand to check with no old pumps etc my mate s a few miles away and has a spare im just going to get it just now thanks for info tho

martysmartie

iTrader: (1)

Not that it should be a problem, as you have a new loom but is there anyway injector number 3 could be getting shorted to ground?

Although if it were true, that injector would be permanently open, in theory.

Also fuel regulator as said, but would that make it over fuel on just one cylinder, I would have thought it would be on all?

Also are all 4 lugs intact on the crank pulley?

Martin

Turbosystems

iTrader: (5)

the regulator vac pipe position and air flow characteristic of the plenum at low engine speeds make it biased to number 3
you can vac check it by using the wife if she likes to suck
failing that suck the reg vac pipe yourself

MK2 COSWORTH

lol cheers mate seems alot better but still splutters at idle only so im off for new oil and plugs i will update later thanks

MK2 COSWORTH

today i checked sensor gaps fitted new plugs an r/arm to no difference??? took the plugs out to find them suited up,, no3 now not wet? but still driving the same runs on three but seems to clear after 2-3000rpm??? could the temp sensor cause this???

MK2 COSWORTH

tried a temp sensor out mates car still no change on tick over

MK2 COSWORTH

i have tried everything!!!! i can only put it down to the timing being out three teeth and starting the engine?? everything else has been swapped or renewed im going to do another comp test tomorrow but with the inlet valves touching pistons (leaving marks) the first time the head went on, im thinking this must be the problem? can the valves be damaged and still give decent comp reading?? the car still seems to drive after 2-3000rpm

daz1968

If the valves are leaking you would not get same reading on all cylinders. You did remove all plugs when doing the compression test,

MK2 COSWORTH

ok thanks mate what about sticky valves? i had to use the car last night, when starting from warm it sounded terrible as if had no comp (like sticky valves,buckets?) i turned it again and it fired but ran like shit, when i started it at home from cold and held the revs above2000 it seemed ok until idle?? i will add readings tonight once i have tester

Turbosystems

iTrader: (5)

you are better doing a cylinder leakage test

MK2 COSWORTH

ok mate thanks, i will call my mate see if he can bring one from his work, quick question for you mate, did you used to own a white f reg cosworth with tiger stripes?? thinkreg ends fev? cheers

MK2 COSWORTH

ok tried the pressure leak test ..no3 was 80% down! my mate then turned the engine by hand and it locked up!so im thinking it has dropped a valve?? engine will have to come apart tonight to source the fault