Hi lad wot symptoms dose a falty map sensor have as i had a problem with my 3dr over xmass and we fort had sorted it well iv just had the car out for the first time in over 3 weeks and when the car comes on to about 20 psi of boost the car coths and bangs but will drive 100% up into 15/18 psi its onle when the boost starts to come after that it plays up

So could it be down to a falty map sensor ?????????

 

Normally a duff map throws the afr out by a mile.
tabetha

 

well im thinking it could be as when i was last up at martins he set the AFR on the car . then the car sat there for the rest of the day i was there then when i started it martin said to me dose it allways run like that when its cold as its running very rich now. but when the car has got nice and hot the car runs nicer but never had the banging and poping problem as the car was only running 15 psi now the boost has gone up to about 24 psi iv got a porblem

 

and as of late the car runs shit when it cold and wont tick over . which is making me think that the map is not doing its job

 

have u got anyone near u who can lend u one to try?!

 

there are some lads round here but iv not got there numbers . my mate rex has a escort cosworth but that allso has a small miss fire some times so i dont wont to try his

 

when i had one go down the ecu was telling the injectors to chuck as much fuel in as poss

so it wouldnt even start up
just flood its self

changed it and all was good

 

are right then . so wot tould happon if i pull the pipe off the map and run it up the road only a short run ?????????

 

when my map sensor went down my car wouldnt run and when it did it just over fuelled

can you rev past a certain revs when just parked up and will it be fine? could be crank sensor or plug gaps

i have a std escos 2.5 bar map sensor if you want to try as this is what i used when my 3 bar went down

 

mines doing the same runs really rich when cold and very lumpy. pops and bangs.

 

thanks for the offer xr4x4rs


its doing my head in at the mo this was the problem my car was having over xmass but with all the help off the lads on here it seamed we got it sorted and it seamed to be the gap on the faz was to big and the car was running spot on so put it away for xmass got it back out today and its fucking back to cothing and banging again

crank sensore is at 1mm
faz sensore is at .4mm
fuel pump volts 13.5 and have tested with the car on boost
fuel pressher has all so been tested 3bar tick over and 3.5bar vac off and at 2bar boost it was at 5.5bar
its got new plugs set at .7 and were running spot on last time out

Its only when the car gose over 20psi of boost it happons

 

Sounds more like the phase sensor to me, have you checked the wires have not corroded and shorting out? I would think if it's the MAP sensor it would massivly over fuel constantly.

Have you checked the coil as it may have broken down and can not cope when reaching the boost you have the problem at?

Martin

 

the phase sensor has only done 4000 miles and it 2.1/2 years old ????
and im running a wast spark setup on the car but it did the same last year when it was running a group a coil so i put the boost back down to standerd and just forgot about it

 

this is of no help to you but i have the same problem on my xetec turbo, if i run upto 14psi boost its ok, but anything over and it coughs and splutters under load, cant get to the bottom of it tho !

 

close the spark plug gaps a bit, sounds like its blowing the spark out

but could be map sensor, are your teeth ok on the crank pulley none chipped

 

ive had a 3 bar fail and it fuelled so much it would only start with throttle wide open and just sustain 2k revs, i couldnt drive it.
i had exactly the same on a saph with the misfire above 20 psi a hard popping and banging but i never did cure it. its ignition related thats for sure imo.

 

On the spark plugs side they went in xmass time and ran the car spot on with 24 psi boost at .7mm

And on the crank pully it has know got a new 1 on it BUT it did do it with the old standerd 1 as well

and its set at 1mm

 

what plugs and have you tried another set? im not keen on alloy pullleys, iknow theyhave the steel ring but prefer original ones as you know the timing marks are spot on

 

One thing it has been doing sins xmass it dose not like to start of the key when cold i have to play with throttle to get it to start and some time when i turn the key it will back fire . Iv had a look at the timing and its ok . When it starts it will cut out if i stop playing with the throttle as the revs try to go down to about 500 RPM . When its been running for about 1 or 2 min it will run on its own and as it warms up the revs go up to about 1000 RPM . Then you go for a drive and it drives 100% in all the gears and all the way upto about 20 psi then it start to play up . the monent it coths and bangs i go for a new gear and its back to a nice dive . I will ad i know the car has got to go to martin for a full set up but it would be nice to sort this problem befor it gose to martin as all it will do is push the bill up

 

I have been advised to put in NGK BCR 8ES to a gap of .6 but i fort that was a bit small so iv set them at .7

 

try .6 and see how you get on, could also be faulty tps

 

The TPS was new last year its a 4x4 one and the wires have been swiched round . And me and REX have got a sheat with all the pin out on it and the sheat give a reading with the throttle open and closed and they were spot on

 

sounds stupid but make sure your ecu connector is in properly aswell and its not loose

 

i had an issue like this Ian and found it to be a faulty fuel reg

Hope thats helps

Matt

 

Reflash the ECU

 

right iv never herd of that wot do you have to do to reflash it

 

Drop plugs to 0.6mm and see if it solves problem, if so HT voltage is the issue.

Also, drop your CPS to 0.8mm and phase to 0.3mm. They work best and most reliably there.

 

Thanks stu i will have a look it this stuff . and i hope its not HT voltage issue as im running your wast sprak set up on the car but it is running a second hand coil pack on the car of a 1.8 mondeo

 

If it helps, check voltage to the ignition amps, coil middle pin and ecu PIn 20 at 20psi boost. Wants to be in exces of 13.5 ideally.

 

If all else fails....

Is the map sensor in the original place ?

Are the plug leads or coil near the map sensor ?

Is the bracket holding the coil earthed ?

Is the ignition amplifer(s) earthed/bonded to car body/earth ?

Are the plug leads tighly cable tied to each other ? (Bad if they are !)

 

Thanks again stu i will have a look

 

map is were it should live
its on a wasted spark set up bolted on the bulk head out of the way
coil pack is bolted on
and ignition amplifers have got bonding greas to the dody
the plug lead are next to each other but no cable tied and there new ford one,s

but saying all this it did the same when it ran the old set up which was a group a coil motor sport leads and the dizzy and one amp

 

Ok, Probably a big long shot, but one car I looked at once had the fuel lines crushed by a missplaced jack and missfired on boost due to lack of fuel.