The car is acting very weird. Under normal load when the car is idling it is normal. When I drive, the car takes off normally and the changes between gears is normal as well. But when I push the car all the way and boost climbs past 9 PSI the car sputters. If I am in neutral and push the accelerator it revs up just fine.

I can reach high-speed fine if I accelerate the car keeping it under nominal load. But the second I push the pedal all the way it starts to stutter. Anyone else have this problem or know what might cause it? It is getting really annoying. Thanks in advance for your help.

Eva01

 

You may be running on wastegate psi (10psi), check your BC. Check all hoses for boost leaks, sounds like you may have one.Did you just add any parts?When you say studded like a misfire?Check your plugs also.

 

yea check the plugs

 

Nothing like a misfire. Just sounds something similar to like if the engine was not receiving enough gas but only when I punch it.

The plugs I just changed a month ago so I would be against that as a suspect. A boost leak would make it studder? What are the usual suspects I should check for that? I might want to mention that I have a boost gauge but that has been connected for the last 12 months without ever an incident.

Eva01

 

Check all hoses/clamps and make sure they are tight and kink free. Sounds more like a boost leak to me.

 

When you changed the plugs, you didnt use magancore wires did you? If so, they are probably loose on the plugs. Even if you didnt, might still want to make sure the wires are securely on the plugs. Also could be a boost leak.

 

yah sounds like it might be fuel cut, do you have stock fuel pump?

 

List of mods please. Also I see you had a prior coil problem, did this get fixed? Just change the plugs anyway cheap piece of mind. What plugs are you running? Gap?

 

Actually what we thought was the coil was just the plugs. That problem was solved by installed all new plugs. No engine mods except for an HKS intake.

Stock fuel pump, and I checked all the hoses. Nothing kinked and everything tight. Why would the fuel cut at 3500 RPM with the pedal all the way down in 1st or 2nd gear.

I will check the plug wires as I did not see if those are super tight yet.

Eva01

 

It sounds pretty simple. You only encounter this when boosting, which is a tell-tale sign that you have a spark problem. You say you don't think it's the plugs because you just changed them, but were they the right plugs with the right gap?

Tell us the exact plugs and exact gap you used. This is not fuel cut nor a boost leak.

 

Mine does something similar. (been saying that a lot lately it seems lol)

If i'm in 5th gear cruising at 75 mph for example, and I put the pedal to the floor the car spits, bucks, and studders as soon as it goes into boost. I don't know what it is, but if I put too much load on it at too low an rpm, it'll do this. However, if i choose the proper gear when I go WOT, theres no problems at all. I think its fuel cut. It started happening when i switched to an EMS. And I have no boost leak.

I'll try to take a video of it tonight or tomorrow.