Ian Thomas

Got a problem with my S2 RST holding back under hard acceleration car is still running MFI, this is after i hit the rev limiter in 2nd. Now what happens when accelerating full throttle when comes on full boost about 4000rpm engine now holds back and pops and bangs. Engine is running stage 3. would anyone have any ideas as im stuck. Could it be a distributer or fueling fault? Cheers Ian

bubs_rsturbo

iTrader: (1)

mine did the same thing soumds like you have an issue with your metering head?!

blackbeautyzetec

had the same problem last week....done the easiest thing.... spark plugs!!!

sorted!!

Korda

iTrader: (1)

Take it for a set up save your turbo and engine

chaffe

not sure what holding back is

blackbeautyzetec

Start with sparks, then if it's not that

Leads
Coil

I put a post like this with no reply but mine don't the exact same as yours.

Is the car still holding boost?

chaffe

unless its missfiring then it wont be the ignition system. Is the timing set correctly? 15 degrees at tickover with the vac pipe off? has it got a boost leak causing the ecu to retard the timing/make it rich?

Versus_Creations

iTrader: (1)

If you hit the rev limiter or the engine back fires etc you have a chance of knocking the metering unit out of calibration.
This will then cause the engine to run differently to how it should.
Each MFi engine could run differently to the next one when these issues happen so not easy to compare faults with another engine or car.

The best advise is to get a tune and setup done then tested on the road to make sure its perfect.

blackbeautyzetec

If it's popping and banging then isn't that a misfire?

And as for a set up.. I took mine for a set up and a week later I had the same problems on my s2....

chaffe

It could very well be.
With missfires, ie ignition breakdowns i always replace everything, plugs (gapped correctly), leads, dizzy. and check the ignition timing. I take it the OP has a timing light?

Ian Thomas

Hi thanks for all your replys. Have checked all the basics, ign timing, valve timing, fuel pressure to metering unit, compressions, no air leaks, plugs cap and arm all good. dont think it is ign as if i drive on a light throttle engine will rev past rpm where fault occurs, its only when at full throttle and boost comes in full it happens. may be trip to Oddkidd creations for a tune and setup?

Korda

iTrader: (1)

I would say take up to oddkidd for a set up

chaffe

or bin the shitty k E jet and put some proper programmable EFI on it, bin the cvh while your at it in favour of a zetec and bin the bc box at the same time

Sjieter

thats not really an option for people who like original cars.. i like my rs turbo like it is.. with the ke jet cvh and bc.

hybridford

iTrader: (4)

Best advice so far in my opinion.

blackbeautyzetec

did you fix this

Versus_Creations

iTrader: (1)

There is nothing wrong with MFi when its working as long as your not trying to get more fuel through it then it can flow.

The real issue is down to how long it will stay in tune and be reliable.

Some cars i setup stay in tune for months, others dont let me go round the block before they go out of tune. Every engine and components are different so it only ever comes down to how good the parts are.

I advise a good setup and tune.... then more importantly a return visit within X amount of time to see if any of the changes have happened. If so how long did you get before needing another setup and tune? If months then maybe live with it. If weeks maybe find a better metering unit or just switch to cosworth value for money.

blackbeautyzetec

Well mine was doing the same thing when cold about a month after my set up. Changed the plugs and it was fine... For a month. The car has to be drive for about 10 mins before I have go on any boost? Spoke to power engenieering but they said I would need to leave it with them for a few days and might have to pay

Ian Thomas

Yes car is now running great. Took it to Oddkidds for Jano to have a look at the other week, and it seemed where i had hit rev limiter and caused a back fire it had put fuel mixture out was also running too much boost for MFI so was running lean under full throttle. Jano set everything up and is still running sweet. Am now looking going Cosworth managment in the new year so will be speaking to him soon. The man knows his stuff, top job cheers.

blackbeautyzetec

Did it matter how cold the engine was or did it happen all the time?

Ian Thomas

I dont give it full throttle till up to temp but it was only under full throttle and when come on full boost that it was playing up, not fueling correctly. Would be worth you getting yours looked at.