lukes1

il start from the begining,i bought the car a few months back with the head off, the gasket had gone. so i had all new gaskets inc a HEAD SKIM. new PLUGS, LEADS, ROTOR ARM, CAP.
started fine but was smoking alot. took it up the road and it cleared but under load it cut out and back fired. ive lived with it ever since. ive since also replaced- b-r-b ecu for a chipped b-r-w ecu, fuel pump relay (brand new ford) i also checked the timing.
i eventually took it to engine advantages in witham to be rolling roaded, told me it was breathing heavy and loosing power through cylinders 1 and 4 (cyl leakage test) afterwards he roadtested it and said it was almost definately the distributor itself. so yesterday i fitted 1 i got off ebay(40 quid 1) and set the timing again. and it still bloody does it. it will either just jerk or jerk and backfire, also when it does this the rev counter drops.
i wondered if any1 had an idea, i know it dont help the plugs are getting oiled up but why would the rev counter drop? bit tiresome i know but any help appreciated.

SafeChav

The rev counter dropping shows the misfire is being caused by ignition cut.

Could be the boost limiter, if not you must have a damaged wire somewhere thats shorting out and cutting the ignition momentarily, as long as your sure the new dizzy isn't faulty.

lukes1

ive got a mates i could try. where is the boost limiter? is it in the silver ecu cos ive changed that. the loom is bit of a mess though, the guy b4 me covered it all in blue + white tape.

SafeChav

The limiter is integrated into the ecu yea.

Does it backfire at any specific boost level? And does it do it in any gear?

lukes1

2nd gear upwards. on the spot its fine. mainly when at high boost, but also when im driving casually poodaling when slightly under load, ie slow up to go round a car and pull out in second. it cuts out at both scenarios but only backfires at high boost obviosly when theres more fuel. are coils renound for playing up, or anything to do with a faulty cold start valve- that dont work 2.

SafeChav

Soounds like the boost limiter to me mate! What boost is it running?

Coils aren't that common, dizzy's are, fuckin awful things on RST's!

Cold start valves are shit too, they do jack shit and most of them are better without anyway.

lukes1

10psi with a bleed valve- had it set to that at rollin rd to slow down my oil comsumption! trouble is it dont always do it. i could drive 40 miles and it might do it once, and then fri night i took it 4 a caning and it done it all night. its not really at max boost, more when im on over run in 4th or 5th then just lightly go back on the throttle, or when i could of selected a lower gear but havnt cos i dont want to thrash it, if you no wat i mean????

SafeChav

If your certain its not boost cut you will have to try replacing parts, and looking for damaged wires etc

lukes1

my mates got a s2, could i try his ecu, not sure of th pattern/ colour code.

SafeChav

It will work regardless, but 10 psi is on the limit for a standard ecu, boost cut will cause the same symptoms you are experiencing.

lukes1

no i know that sort of cut out, my old 1 done it when i tried winding the boost up.so i went back to the amal valve. i then got another ecu (CHIPPED)and it still done the misfire im talking about. i then went back to the bleed valve and ive had it at 12 psi, no cut outs at max boost which sugests the ecu i bought IS chipped. when a limiter is faulty will it cut out at any time, at any boost?[/i]

gup

iTrader: (1)

check your plug gaps too as these can cause a miss fire under boost

Grandad racer

cud it be the feul meter unit?seems uv looked at ever thing else

SafeChav

Well anything could be faulty but it would be VERY rare for 2 ecu's to have the same fault. I personally then think you have a faulty dizzy and/or wiring fault somewhere.

Good suggestion but its an ignition cut, the rev counter is dropping to 0 which is the dead giveaway in this instance

lukes1

thats what im thinking. it has definately got WORSE since fitting the 'NEW' distributor i got off ebay. it was the bloke who had a job lot of them. looks the part but im not 2 sure. ive emailed some 1 else who bought 1 off him see how his was. still no reply. or it could be a case of where ive disturbed the wires? il try my mates dizzy 2moro.
was it wise to have the head re-faced, buing a turbo? or could my injectors be partially blocked what with all the oil being put through?

SafeChav

I wouldnt worry about the oil mate, the fuel will soon wash all that off

lukes1

by the way the rev counter doesnt get enough time to drop to 0, it literally cuts out, backfires and carrys on as normal,

-----------------*---------------
vroooooooo bang oooooooom

just like that!

SafeChav

Thought you said it did drop to 0

Even if its momentarily, ignition cut will make the needle very eratic in its operation.

gup

iTrader: (1)

anymore joy on this one fella

lukes1

no, tried just unwrapping the loom a bit, no wires seem to be fouling anywhere. even more bad news though, took my boost pipes off and my turbos got a whole lot of play in it! fooooookin' cars! il be better off gettin' rid!

gup

iTrader: (1)

joys of a turbo matey you replace one thing the other part gets jealous and fucks off lol
ps ive got a pukka turbo for sale hee hee hee

lukes1

is it standard? and more importantly HOW MUCH!!

gup

iTrader: (1)

pm sent matey

lukes1

tried another coil today as mine was corroded in the ht connection. drove home from work , and thought yyyyyeeeesssss! SORTED!
just thinking what i was gonna write on here tonight and BANG!- it started again. although is definately an inprovement. also cleaned up a few earth points. so just waiting to try a mates dizzle then after that im stumped. il b back to the drawing board.

lukes1

hoooooooooooooooooorraaaaaaaaaaaaaaaayyyyyyyyy!!!! !!!!!!!!!!!!

4 sodding months of this fecking misfire, and now ive cracked it

cap and arm £10
plugs & leads £20
ecu £100
coil £15
recon dizzy bizzle £43

robbing a BALLAST RESISTOR off an xr31 with melted interior and roof from a mup pit pikey scrap yard
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PRICELESS!!!!!!!!!!!!!!!!!!!!

SafeChav