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Engine Loses Power & Cuts Out On Boost

surlyjez
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surlyjez Apprentice

surlyjez

Posted
Posted

Last night i went for a drive in my 32 gtst and was all fine one moment, accelerated hard and good on boost then all of a sudden at about 3000 rpm when the turbo starts to spool the engine started sputtering / cutting out / losing power and stalled, i then had trouble getting it started again, it is fine under 3000 rpm but the engine cuts out over that.

The 32 is completely stock just changed the spark plugs 2 months ago. From what i have read it sounds maybe coil packs or fuel pump or afm???

Any ideas or tips to narrow it down?

Cheers,

BOOZTJUNKEY Proficient

BOOZTJUNKEY

Posted
Posted

Maybe coil packs but saying you can't rev over 3k makes me think dead air flow meter check ecu for errors codes to rule out sensor then check all rubber hose joiners and clamps ( joiners for splits and make sure clamps are tight) and check vacuum hoses for splits or blown off lines

Bronx Mentor

Bronx

Posted
Posted

belive it or not, i actually put brand new NGK's into my car not even 1 month ago and i have run into the same problem. swapped for a new set and its all gone. just faulty spark plugs. go to just jap or so and buy a cheap set for 20 bucks, easy as.

i bet my money on the sparkies :D

surlyjez Apprentice

surlyjez

Posted
  • Author
Posted (edited)

Changed the spark plugs this arvo still dies when it hits about 3k revs under load. Not sure what it might be. maybe coil packs or afm?????? any ideas anyone

cheers,

Edited by surlyjez
Bronx Mentor

Bronx

Posted
Posted (edited)

guess it could be your coil packs then, doubt its the afm or a boost leak, sounds like a ignition problem, so guess your coilpacks cant charge fast enough to create a big enough spark for the high boost range, since low boost your compression isnt high enough for the spark to have difficulties jumping.

find a spare pack of coilovers from someone, cause spending 500 bucks and finding out its not them, is a pain to.

i have a spare set for a rb25neo engine and a set for rb26dett, but i dont think any of them fit your rb20...

or while your at it, might as well change your fuel filter just to be safe.

Edited by Bronx
Bronx Mentor

Bronx

Posted
Posted

what gap you use on your spark plugs????

eventhough my car is stock, and only boosts to 7psi on high, i sometimes have trouble runnin 0.8mm gap, so i use 0.6mm...... kinda weird, but ive been told by most tuners that for forced induction cars should be gapped to 0.6mm

Bronx Mentor

Bronx

Posted
Posted

1.1mm???????? wow, my car wont fire past 2800rpm with that, and ive used diff types of plugs, used pulstars, cheap NGK, NGK platinum and iridium, also Autolite double plats. all had problems firing with 1.1mm gaps.

guess you have some good sparkies??? when i uprated my coilpacks to the splitfires, i havent had problems firing 0.8mm gaps, but still 1.1mm under high boost.

still choose 0.6mm though.... also im running heat range 7 from ngk, the 6 heat range always cracked for me. i swear to god my engine has its periods....

bubba Grand Master

bubba

Posted
Posted (edited)

i have a spare set for a rb25neo engine and a set for rb26dett, but i dont think any of them fit your rb20...

RB20 and RB26 coilpacks are the same, so are series 1 RB25.

Edited by bubba
surlyjez Apprentice

surlyjez

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Posted

I think I have fixed my problem. What i did was take the afm out and spray some non residue leaving degreaser stuff through it and let it dry. plugged it all back in and at first it ran even worse but then i reset the ecu and it was all good. back to Better than normal. Hopefully it is all good now. :banana:

surlyjez Apprentice

surlyjez

Posted
  • Author
Posted

1.1mm???????? wow, my car wont fire past 2800rpm with that, and ive used diff types of plugs, used pulstars, cheap NGK, NGK platinum and iridium, also Autolite double plats. all had problems firing with 1.1mm gaps.

guess you have some good sparkies??? when i uprated my coilpacks to the splitfires, i havent had problems firing 0.8mm gaps, but still 1.1mm under high boost.

still choose 0.6mm though.... also im running heat range 7 from ngk, the 6 heat range always cracked for me. i swear to god my engine has its periods....

im using the cheap copper ngk ones now, before i had iridium bosch ones and before that had some platinum ones, but they were all gapped at 1.1mm and its always been fine. maybe ill try gapping them down to 0.8mm and see what happens.

Cheers,

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