what would happen if (efi question)
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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
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
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Originally Posted by jayRS
it would cut out, if it didnt, it wouldnt rev very well (if at all) and run like a bag of dog shit
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Originally Posted by jonesymk2
Originally Posted by jayRS
it would cut out, if it didnt, it wouldnt rev very well (if at all) and run like a bag of dog shit
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Originally Posted by jayRS
Originally Posted by jonesymk2
Originally Posted by jayRS
it would cut out, if it didnt, it wouldnt rev very well (if at all) and run like a bag of dog shit
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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
beats me mate, with all them sensors disconnected it should run like shit or not at all
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Originally Posted by jayRS
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
beats me mate, with all them sensors disconnected it should run like shit or not at all
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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
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Originally Posted by vroomtshh
If you really want it to break, just chuck some metal filings in with the oil. Much simpler ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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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
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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.
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.
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Originally Posted by xr4x4rs
whats the actual problem? ![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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Originally Posted by JohnnyB
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.
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.
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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
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Originally Posted by xr4x4rs
have you tried a different map sensor?
and do they have a water sensor for the ecu
i carnt remember
and do they have a water sensor for the ecu
i carnt remember
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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
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
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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
it also ran like shit once when the cam ate the ass off a tappet
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Originally Posted by xr4x4rs
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
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
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Originally Posted by jayRS
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
it also ran like shit once when the cam ate the ass off a tappet
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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
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
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Originally Posted by jayRS
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
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
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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
![](https://img.photobucket.com/albums/v603/jayrs/Picture1443.jpg)
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
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
![](https://img.photobucket.com/albums/v603/jayrs/Picture1443.jpg)
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
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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
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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
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
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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
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