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Rb26 Wont Idle When Cold Only When Its Hot

toy515

By toy515,
in Engines & Forced Induction

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toy515 Grand Master

toy515

Posted
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hey guys i have a rb26 with power fc and rb25afm

i got the car tuned about 4 months ago it was purring like a kitten running perfect then i pulled the engine out and painted the engine bay, i also painted the engine covers so i had to take the cas off and i didnt mark it probably but ive got it as close as possible and now it starts fine idles for about 10 seconds and shuts off, but when its hot 72 degrees it will idle for 6 days if i wanted to.

ive tried everything ive cleaned the airflow meters

checked all connections

before i took it out i had the 02 sensors still in there but i spoke to the tuner and he said they were switched off when he tuned it so i didnt put them back in could that have anything to do with idle?

cheers

toy515 Grand Master

toy515

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which one is the air regulator is that at the back of the engine under throttle bodys or under the plenum? i havnt touched anything since it was tuned? the only thing ive changed is the cas and when i removed it i didnt mark it very well, will the cas cause it to stall on idle?

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
which one is the air regulator is that at the back of the engine under throttle bodys or under the plenum? i havnt touched anything since it was tuned? the only thing ive changed is the cas and when i removed it i didnt mark it very well, will the cas cause it to stall on idle?

its under the plenum...it has a rubber hose attached either side of it.

i removed mine from my drag car and it does exactly as you have described yours is doing now.

toy515 Grand Master

toy515

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yer mate just checked ive got the two pluged in under the plenum ones going to where that screw is for your idle and the other to the air regulator like under the throttle bodies the blue plug is going to the air reg and the blown is going to the other?

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
yer mate just checked ive got the two pluged in under the plenum ones going to where that screw is for your idle and the other to the air regulator like under the throttle bodies the blue plug is going to the air reg and the blown is going to the other?

the procedure for testing the air reg is in the workshop manual...do you have a copy?

do a search online and you should be able to download it somewhere.

toy515 Grand Master

toy515

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  • Author
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tried a another air regulator still no go? how much are they supposed to open up does anyone know? should you be able to see the hole way through the 2 holes or is it only about 1mm its open? because this one only opens about 1.5mm really small hole?

maybe i bought a faulty one, i dont want to go out and spend 220 on a brand new one when it mite not be the problem?

any ideas

femno Grand Master

femno

Posted
Posted

In the powerfc, go to ETC > Sensor check, do that first while the problem is evident (when cold).

Look for any values highlighted with a black box around them. If any are highlighted, the parameters are incorrect, which means faulty setting, sensor or wiring. Your exhaust temp light should be on if there is a fault, although considering the engine is transplanted then it may not be connected.

If there is nothing, it could be your air reg. It could not.

toy515 Grand Master

toy515

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ok guys i had a look and when the car switches to accessories the ignition, eccs, and idle lights up but when i switch the car on the fuel pump light comes on as well

what does this mean? ecu? fuel pump? anyway to test these

femno Grand Master

femno

Posted
Posted
ok guys i had a look and when the car switches to accessories the ignition, eccs, and idle lights up but when i switch the car on the fuel pump light comes on as well

what does this mean? ecu? fuel pump? anyway to test these

no, no those are normal.

youre looking for values that are highlighted, not the circular dot type things. The idle should constantly be on when youre not touching the pedal, then off when you open the throttle, but it wont cause your problem.

if no values are highlighted then sensors are ok. so look for faulty actuators ie air control valve or other.

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