Rough idle, stalling at times

[mtx911]

Heres the story on my 7mgte.

I have a idiling issue, only once the car is warmed up tho.
On a cold start, the car will start nice and rev about 1000-1500 RPM
until the engine is warm and then back down to normal speed, everythings
good. But my problem is that once the engine HAS warmed up, and you turn the car off and come back 10 mins later, start the car, it will sputter then start VERY rough like the car kinda rumbles, its bad, i usually just kick start it by pressing the gas at around 2000rpm for 5 seconds, and then let go and the car usually gets normal again. rough starting ONLY when the engine has already been warmed up. i heard bad EGR, i have no clue wat to looks for,
it obviously seems to be lacking something on a warm startup..
thnx. :aigo:

 

[hvyman]

check for codes
http://cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

then go threw this list.(there more on the 2nd page)
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=16

thats the repair manual/epc/ewd so save it.

 

[mtx911]

check for codes
http://cygnusx1.net/Supra/TechTips/engine_error_codes.aspx

then go threw this list.(there more on the 2nd page)
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=16

thats the repair manual/epc/ewd so save it.

No codes found. Id expect their would be something..
Wheres the EGR?

 

[hvyman]

drivers side of the engine at the back right under the throttle linkage. you will see a pipe going from the head to the intake manifold.

 

[mtx911]

drivers side of the engine at the back right under the throttle linkage. you will see a pipe going from the head to the intake manifold.

What do u think it could be? :1zhelp:

 

[hvyman]

could be a vacuum leak, your afm, tps, isc. i would start with a vacuum leak.

 

[Green7mgte]

not to hijack but the same thing is happeneing to me. sometimes ill turn it off then it won't even start less i goose the gass peddle.

 

[Killer MK3]

check wiring/plug CPS!

 

[mtx911]

what the hell is CPS ???

 

[mtx911]

Its near impossible to find a vaccum leak.. im not sure where to start..
if it was vaccum i wud think it would do it all the time rather than just when i start it up.
is it maf or afm or 7mgte?
clean the sensors ?

 

[mtx911]

wheres iac on 7mgte

 

[S.A. supra]

cam positioning sensor. On the hot side, above the thermostat housing

 

[S.A. supra]

wheres iac on 7mgte

Iac do you mean the iscv? Idle speed control. if so it is on the intake manifold. It has a big 6 wire plug going to it. it is more toward the alternator

 

[mtx911]

clean all these sensors or something iuno wtf causing this to stupid to pinpoint..
watever it is it gets back to normal after 5-7 seconds of gas..

 

[S.A. supra]

It is probably a vacuum leak. They are hard to find. Get your head down there in the engine bay and listen closely, Maybe you'll be able to hear it. good luck I hate leaks.

 

[mtx911]

if it was a leak wudnt it do it all the time all low rpms not just only on the startup

 

[mk3tattoos]

not to hijack but the same thing is happeneing to me. sometimes ill turn it off then it won't even start less i goose the gass peddle.

i have the same problem as well, we realy need to find the issue here! i heard of someone putting a switch in the car that bypasses the vsv or somthing and you hold that for ten sec. and everthing will be good.

but something is happening after warm start for sure. and i dont think it is a vac leak or spark realated at all. it is the computer that is sending or getting the wrong info, and then it runs like shit.

 

[mtx911]

Somethings being a bitch.. not a vaccum leak it wud do it all the time if it was..
not spark.. i have no clue guna have to rip some shit apart n clean it all
im thinkin iscv or something stick.. afm dirty as shit i have no clue
couple seconds on the gas pedal fixes it tho.. dont get it

 

[Neal]

Fuel pressure VSV line or maybe the VSV itself. VSV is mounted under the inlet manifold.
Look at the vacume layout on tsrm.
It sounds like heat soak to me, since you have no problem on cold starts.

Link to finding the vsv: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=3

 

[mtx911]

how do i check the egr??