running rough

[johnsupra]

can anyone please help me my supra wont pass 3500rpm it keeps breaking down and back firing i have tried plugs ,coil packs ,map sencor,tps and ecu

[steve.82]

Tried leads?

[BigSupe]

map sensor hose or loose clip on a coil pack maybe

[nigel w]

symptoms sound like lean mixture. Your fuel pump might be failing to maintain fuel pressure.

[MKIII]

change the last a lifetime fuel filter as well, they get amazingly clogged up
and do nothing for fuel flow, nice new toyota fuel filter can make a world of difference to the way an engine runs,

[mark]

When you say 'tried ecu' dyou mean you've got another you've swapped it out with? or just checked connections to it? reason i mention it is i've got one here that displays exactly those symptoms - but swap it with the one i'm using and the problem goes away.
hope its not that : (

[johnsupra]

ya i swapped out the ecu

[davyd269]

youve not just replaced the timing belt have you

[johnsupra]

no its not due for another 30k

[Beacon01]

Had same Problem a few day`s ago and it was the Cam Shaft sensor.
It had started to fill up with oil and the cable`s had become very brittle inside.
Runs a dream now

[supradupra.com]

Possibly the fuel pump relay or assosiated parts not kicking in and increasing fuel pump speed.

You can manually override the system by linking FP and B+ at the check connector and trying the engine.

It rules out one more thing

[johnsupra]

stil have the same problem so far i have tried tps map sensor ecu coil packs plugs coilpack connections injectors got the car pluged in and there is no faults comming up can anyone please help

[the 1]

stil have the same problem so far i have tried tps map sensor ecu coil packs plugs coilpack connections injectors got the car pluged in and there is no faults comming up can anyone please help

does it puff out black smoke when you hit 3000-3500 ????
check your boost pipes , especially the one under the turbo

[the 1]

does it puff out black smoke when you hit 3000-3500 ????
check your boost pipes , especially the one under the turbo

OOOPPPSSS , MY BAD
just noticed this is the 1j section ,, sowwy:blonde:

[johnsupra]

does it puff out black smoke when you hit 3000-3500 ????
check your boost pipes , especially the one under the turbo

not realy it like you hit the limeter at 3500rpm and drops to 1500rpm

[the 1]

whats the spec on your car
standard , modified , limiter still in place ?
are the cats still fitted ?

[johnsupra]

whats the spec on your car
standard , modified , limiter still in place ?
are the cats still fitted ?

standard limiter still in cats are gone

[Martin P]

check the ignitor pack, its near the Engine bay fuse box,

[johnsupra]

stil have this problem just after changing the engine and its stil over fueling

[pauljosephfurey]

I seen this car running last nite. it wont pass 3500 revs and fills the shed with black smoke, we also noticed a vacuum hose attatched to throtlle body area not connected in,, can anyone send us a link to vacuum hose diagrams???

[johnsupra]

found where that vaccum hose goes and no difference

[Simon91t]

changed the engine and its still over fueling? what fuel pump are you running? are the injectors wrong? you sure the ecu you tried isnt faulty also?

[johnsupra]

changed the engine and its still over fueling? what fuel pump are you running? are the injectors wrong? you sure the ecu you tried isnt faulty also?

ya changed everything out of a car that was running perfect im using a standard fuel pump the ecu i used is good it came out of the same car

[Simon91t]

Maybe your chassis has a hex on it

[johnsupra]

im starting to think that

[Simon91t]

see what im strugling to understand mate is,
this started in 2009 and since then youve changed the engine and ecu and your still getting the same problem? there MUST and i mean MUST MUST MUST be 1 single common demominator here. Something has stayed the same between the engine swaps to keep this problem here.
And if it is over fueling it has to be something with the fuel and or air going into the engine, so lets start with what you kept in the car and what you swapped out, right down to the airfilter

[johnsupra]

see what im strugling to understand mate is,
this started in 2009 and since then youve changed the engine and ecu and your still getting the same problem? there MUST and i mean MUST MUST MUST be 1 single common demominator here. Something has stayed the same between the engine swaps to keep this problem here.
And if it is over fueling it has to be something with the fuel and or air going into the engine, so lets start with what you kept in the car and what you swapped out, right down to the airfilter

well i swapped out the engine and everything thats on it the only thing that was part of the supra was the intercooler and piping everthing else has been changed

[Simon91t]

this is so weird.

[johnsupra]

i know everything has been changed is there any units or relays that would cause this

[Simon91t]

i dont know mate i thought the ECU would controll the fueling. is the intercooler in good working order. would a blockage not affect the running, starving it of air cause it to overfuel?

[Oxedizer]

So it's applied the correct amount of fuel according to if it was going to rev all the way? Have the waste gates been looked at?

My old MR2 did a similar thing, wouldn't rev past 4k black smoke from about 2k, turned out to be a combination of a knackered wast gate flap and actuator.

If the car was driven very "softly" then it was fine, just under any sort of boost condition, it would **** itself.


Matt.

[johnsupra]

i dont know mate i thought the ECU would controll the fueling. is the intercooler in good working order. would a blockage not affect the running, starving it of air cause it to overfuel?

just tried another intercooler there and no change

[pauljosephfurey]

or try dissconnecting the vacuum hose attatched to fuel pressure regulator see if it runs worse or the same, if the same it could be a problem with your vacuum