what would happen if you unplug the tps,co pot and disconnect the pipe 4 the map sensor from the inlet manifold,would the engine still run and rev up

what would happen if you unplug the tps,co pot and the iscv but hold the revs up a little so the engine doesnt cut out,would the engine still rev up

 

any body

 

it would cut out, if it didnt, it wouldnt rev very well (if at all) and run like a bag of dog shit

 

 

thats what i thought should happen but it doesnt seem 2 make any difference atall

 

what u laughing at

 

WTF, does the fuel pump prime all the time when only the ignitions on? all i can think is the ecu is in limp home mode

 

when the ignition is on it primes then when u start the engine the pump starts pumping the fuel as normal

 

so it buzzez then stops, start car and away you go then.

beats me mate, with all them sensors disconnected it should run like shit or not at all

 

bttt

 

yep buzzes then stops,then fire car up and it runs and the pump buzzes away pumping the fuel

 

just tried sumthing else i unplugged the co pot,tps,iscv and the pipe from the inlet manifold 2 the map sensor then tried starting the car,it was a pig 2 start but it started then it wud also rev up aswell

 

If you really want it to break, just chuck some metal filings in with the oil. Much simpler

 

well at the moment im trying 2 figure out whats wrong with it and if theres any problems with the sensors so was hoping if i unplugged them 1 by 1 it might highlight a problem but it takes the piss when all of those sensors are unplugged and it still starts up and will rev up,obviously i didnt rev it 2 much or leave it running 4 2 long either

 

what problems are you having

would if been an easier question than asking what if i disconnect all my sensors would i be able to rev the engine up

 

well i hav asked questions a few times b4 and never got anywhere really

 

it would be a lot easier though mate

as you dont know what damage you can cause by disconnecting the sensors and trying to hold it on revs

 

yeh i know mate but every time ive asked a question i either dont get any replies or hardly any,then when i do get replies they dont seem 2 make any difference,ive asked questions about the co pot cause that doesnt actually seem 2 do anything and there is voltage going into the sensor through 2 of the 3 wires,then when i thought i was onto sumthing sum1 else said sumthing else which made the 1st lot of advice void basically

 

whats the actual problem?

 

a EFI car will run if one or the other is connected

it has to have some way of quessing the gass flow into the engine.

but not if all are discontected.

but say if one or two leaking injectors it may try and run.

 

well when its ticking over its running very rich whether its got blue or beige injectors in or if the chip is plugged in or not,it will rev up but sounds like it misses a bit but will rev past it,then when i try 2 drive it as soon as it starts 2 come on boost it starts 2 cough and splutter and impossible 2 drive but as soon as u dip the clutch it will rev up until it gets loaded up again when i lift the clutch,the co pot doesnt seem 2 make any difference when its adjusted either way so i thought it might b that but sum1 said its not,it might just need setting up but i didnt want 2 take it 4 a setup and there b a problem that i havnt noticed

 

have you tried a different map sensor?

and do they have a water sensor for the ecu

i carnt remember

 

well ive had it running with all those sensors disconnected at the same time

how tight should the injectors be then,wud u b able 2 turn them in the pockets when the fuel rail is on aswell,how low should the injectors sit in the pockets in the inlet manifold

 

i havnt got another map sensor 2 try i had enough trouble finding the ofac 1 ive got now,where wud the water sensor b located wud that b the sensor in the inlet manifold underneath

 

yes

should be a blue sensor 2 pin connector

as if this has failed then it will tell the ecu to put more fuel in as its thinks the engines cold

i take it your running ofac ecu aswell and you have defintly got a ofac map sensor not a xr2i or xr3i one as they look all the same bar the part numbers

 

sounds to me like the fuel pump is on its way out and not giving enough pressure, my rs done the same when the fuel pump started going wrong.

it also ran like shit once when the cam ate the ass off a tappet

 

yeh def got ofac map sensor,i will try the water sensor aswell,like i said it might just need a decent setup but i wud prefer 2 get it running better than it is b4 the setup so i dont hav 2 fork out twice 4 another setup if the 1st setup shows up sumthing silly

 

surely if the fuel pump was at fault it wouldnt run rich all the time

 

no prob not, but you have said you have tried everything else so maybe test something you havent.

 

ok then i will try that but how can i check it

 

fuel pressure gauge, you can buy a kit, or just nip down a tuners/garage and get it checked.

ive re-read the problem (you posted) are you sure all 4 are firing? what are the plugs like, are any HT leads damaged or broken, and have you had any plugs off.

also has anyone adjusted the co adjuster or the fuel pressure regulator

 

all 4 plugs were new and all 4 leads were new aswell,also replaced the coil pack aswell,the fuel pressure regulator still had the cap on so hadnt been adjusted,i removed the cap and if i adjust it it makes a little bit of difference,the co pot didnt hav the cap on it so cud hav been adjusted but if i adjust it it doesnt make any difference atall

 

basically no matter what ive tried nothing makes any difference atall

 

the co sensor wont have a cap, and tbh adjusting it makes little differecne but can make you get more fuel, i had mine adjusted when at power engineering, didnt notice any difference but he said it would, but who knows lol.

if all sensors seem to work, fuel systems ok, ecu is fine, basicly your saying everything apart from the engine it self is ok, so now you have to look at the fact that something within the head could be naffed.

my rs ran like shit for a while once, i went through everything, then finaly came to the fact that something in the head must be to blaim.

it was, this



on the left is a good tappet, on the right, one that got eaten by the cam, thanks to this the swarf fucked the big end below and i had to rebuild the engine, the cam was scrap to as it wore the cam out

 

surely if there was a problem with the head it wud show all the time wudnt it,it only seems 2 play up when the engine is under load when the turbo starts 2 spool up

 

yeah, but your telling me everything else is fine, so i got no other ideas other than the engine or its associated parts.

if you really belive its not the engine your have to start again as something isnt right.

thats the thing with problems like this, you cant give too much of a accurate answer without seeing the car, mo so if your saying everything is ok and the car still runs like shit


your gunna have to get it somewhere and have it tested on a machine, i still stick with what i said first, a sensor has gone down, and remember, unplugging a fucked sensor wont make any difference to the way it runs as its fucked and the cars running back before you unplug it.

sorry mate, i can see why people havent been replying to your posts, they prob dont know the problem as you have said everything is fine, and its now got to the point you have to take it somewhere to be sorted, we/i cant say what is at fault if you maintain everything is ok.

the 4 most impornat sensors (not including the MAP sensor) ar the water temp back of inlet, ACT at top of inlet, the TPS, and the speed sensor off the gearbox.

other than that, take the ISCVoff and clean it, it prob wont make a difference but its prob due for a clean and wont do ay harm

 

ok then cheers mate will try that,i will try the water sensor aswell

 

i just cant understand y the car still runs almost the same when all those sensors are unplugged but nevermind

 

it runs the same as its not running spot on, as something is not right, so its reverted back to a "safe" if you want standard programe, so unplugging things wont always sort it.

if for agrument sake the water sensor was at fault and you fitted a new one and it started running fine, and you unpluged something differnt you would then see a change, the fact somethings "chanegd" already unplugging more stuff insn;t highlighing the problem.

if you cant get it on a machine to test the ecu for fault codes your have to do it the hard (and sometimes expensive) way and replace the sensors 1 by one, fitting new or 100% fully known to work s/h ones

 

sorted it yet?