R33 sputter on higher RPM

[GTRVspec33]

Can someone please tell me why my car would sputter when i reach 3200 rpm and higher? I have the HKS EVC and injector contoller installed. Even tho I turned it on or off, it sputters. Anyone know what is the problem? please help.

[tazdev]

checked your plugs recently?

[GTRVspec33]

i did check the plugs. It seems good

[SkylineUSA]

I just worked on a R33 GTR last night with the same problem. I swapped the MAFs, with the ones on my GTR and it fixed the problem, so I would check the MAFs. Take them off and give them a good spray with carb cleaner. Remeber they are very delicate. I have cleaned them with a brush and alcohol, but you have to take off the screen for that. If you do have to go that route, take the engine side screen off, not the screen on the filter side.

[SkylineUSA]

I did not read the part about the EVC, you might have an issue with that, but try the MAFs first.

[tyndago]

Bad plug, bad coil,bad maf, bad tune.

Weird at about 3200 rpms. Not normal rpm. Normally its around 2500 ish or 4500 ish.

[davehack]

can someone please tell me what maf's means cause l am having the same problem with my car

[tyndago]

MAF is mass air flow meter. They have emotional difficulties at times.

[davehack]

l am having same problem but it is only when l am running 12 psi not when l am running the standard boost anyone got any idea's or is it the same problem

[tyndago]

You have bad plugs, or bad gas, bad tuning. Its probably putting the spark out.

What plugs are in it ?

What fuel ?

When was the last time the fuel filter was replaced ?

Have you checked base timing ?

What computer is in the car ?

[davehack]

it is standard ecu at the moment. l use ngk plugs they are new and run bp ultimate fuel 98 octane dont know about fuel filter though but am getting it serviced next week and told them to carbon clean the air flow meter to see if that was it mr coils were a bit carbed up but just funny that l only get it on high boost and only in 2 and 3 gear

[tyndago]

Originally Posted by davehack

it is standard ecu at the moment. l use ngk plugs they are new and run bp ultimate fuel 98 octane dont know about fuel filter though but am getting it serviced next week and told them to carbon clean the air flow meter to see if that was it mr coils were a bit carbed up but just funny that l only get it on high boost and only in 2 and 3 gear

Which NGK plug ? What is the gap ?

You might have a coil going bad.

How much boost is high boost ?

High boost - 2nd and 3rd gear normally means its putting the spark out. It could be detonation, it could just be way too rich.

[davehack]

Originally Posted by davehack

l am having same problem but it is only when l am running 12 psi not when l am running the standard boost anyone got any idea's or is it the same problem

12psi the gap is .8 dont think it is detonating cause there is no pinging they are iridium plugs think it might be cross fire cause coils havent been serviced will let you know. what do you think

[tyndago]

Originally Posted by davehack

12psi the gap is .8 dont think it is detonating cause there is no pinging they are iridium plugs think it might be cross fire cause coils havent been serviced will let you know. what do you think

12 psi is not high ....it shouldnt be putting the spark out... It might be a coil or a MAF..... more likely a coil having a bad day under higher load.

But the MAFs can be trickey.