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Engine is cutting out on standard boost

Scooby_Steve

By Scooby_Steve,
in General Maintenance

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Scooby_Steve Community Regular

Scooby_Steve

Posted
Posted

Hi,

I've got a SII skyline with just an exhaust (full). With this exhaust it was running 9psi (without upping the boost). I then put in a bleeder valve ,(GFB brand) and ran it at 10psi. It was running perfect on all gears without any "cutting out". Then the next day it started cutting out very often. I have since removed the bleeder value and the engine is only running a measly 7psi (with the exhaust) but still cuts out... Does anyone have any ideas what is wrong and maybe what i can do to fix it? any help would be much appreciate it.

thanks,

Steve

Z00MxRACING Enthusiast

Z00MxRACING

Posted
Posted

also u may wanna get ur actuator (wastegate) leak tested ... coz if that is leaking it will boost normally at a certain rpm then will suddenly cut or jerk ar higher rpm ... (cut out)

juzz get the tube from the actuator going to the IC piping and let it blow into the tube with a air compressor and listen for air leak .. if its tight (the air blowing) that means your actuator is still good ...then back to the square boards..

hope dat helps..

  • 3 weeks later...
Scooby_Steve Community Regular

Scooby_Steve

Posted
  • Author
Posted

Hi,

I have tried what you guys have said but still no luck.... It's taken me so long to repsond as I was trying to put a cooler in.

I forgot to mention that the jerking happens from about 3000rpm to 7000rpm (roughly when the turbo start to spool) in all gears.

Any more help or opinions are much appreciated. Thank you.

Steve

Al Grand Master

Al

Posted
Posted
you Ecu Computer has blown get it fixed or buy a new one =]  

i had that problem before !

Let’s all just jump to the worst scenario and start throwing money away.

Check all vacuum lines to and from the turbo, plenum, etc. What year is your car? This can also be caused by coils, or the igniter pack. B4 buying big dollar items I would personally go to a good import mechanic and give them a go at finding the problem.

Scooby_Steve Community Regular

Scooby_Steve

Posted
  • Author
Posted

Hi,

I've read the post about the misfiring.... I'd say my car is in the same scenario.. I havent yet looked at the coils but will be doing so.

I'm reluctant to say its the ECU because the boost was only changed to 1 psi more than what the mods had given it (ie exhaust gave it 2 psi more to make it run total of 9psi and then i winded it up 1psi to make it 10psi) and that when the problem started happening. Thanks for you input.

I'd like to take it to a good mechanic but there arent a great deal of mechanics in the area i live in that would have probably worked on imports....

Lastly, my car is a SII R33 Skyline GTST.

Once again thanks again.

Steve

Zahos Mentor

Zahos

Posted
Posted

i also had this happen the way you are describing once, and turned out to be oxidation on the coil packs. When I pulled them out, one of them was green where the coil pack makes contact with the spark plug. Cleaned them all with WD40 and car has never run smoother. Many people I've spoken to overlook this point.

Cracked coils usually dont make a big difference on standard boost, but if you are getting it as low as 3000 rpm, I definately suggest looking for any oxidation.

  • 1 month later...
benl1981 Grand Master

benl1981

Posted
Posted

I'm getting a miss right when it comes on boost about 3000rpm, actually More like just a hesitation and have also felt a cut at about 3000rpm in 4th. Put new plugs in at 0.8 gap - no change

Anyway. I am running the car without the sparkplug cover on, I can see arcing on 5 if not 6 of the coils. So I'm hoping this is the problem. You can only see it if it is VERY dark and helps if the car is warm...

I thought it was only No.1 coil but after a closer look - ALL of them

I was thinking it was an ECU cut out. But I don't think so anymore. I'll let you know once I get new coils or fix these ones.

  • 1 month later...
Scooby_Steve Community Regular

Scooby_Steve

Posted
  • Author
Posted

Hi,

I found that by taping the coils, my hesistation, backfiring goes away so I know i've got cracked coils however, if in 4th or 5th gear I and decide to overtake, sometimes it will just cut right off and then go again so i dun know whats going on there.

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