Big thump when hitting high boost??

[Kdouglas89]

I am really not sure how to explain the issue I am having. I just got done putting my FMIC back on after a good clean. Took it for a slow ride around the block, and on the way back, I gave it a good pull. By the time I hit full boost, It felt like my car hit a break wall for a second. I let off, and it drove normal. I didn't do another pull thinking one of my intercooler pipings might have come off or something.

I got back, and everything looks normal. Would this be related to the intercooler, or does it sound something like fuel cut issues?

Any help would be appreciated!



Edit : Been looking around more at fuel cut symptoms, and it definitely sounds like I have them! I have stock fuel pump, and stock injectors, and I have not re-wired the pump. I actually just ordered new injectors today, but it sounds as if I will be needing a new fuel pump?

 

[ShadyDoins]

What turbo and boost level?

 

[Kdouglas89]

What turbo and boost level?

Its an auto with a 14b, and 12-14 lbs. Not much done to the car.

 

[wmrcs]

Sounds like fuel cut.

 

[Kdouglas89]

Sounds like fuel cut.

Yes it does. I bought stock injectors for pretty cheap until I start doing some work on this car. Hopefully it cleans it up. I might just have to go the fuel pump route.

 

[My1GLaser]

Fuel cut doesn't have anything to do with actual fuel supply. You can replace the whole fuel system and it will still do it.

It is controlled by the ECU when it sees a certain airflow level. It assumes that you still have the stock fuel system and cuts the supply so you don't blow up your motor. You have to lie to the ECU about airflow numbers, or get rid of the fuel cut in the ECU itself.

An SAFC or something similar that reduces the airflow numbers to the ECU is a decent fix. DSMLink gets rid of fuel cut, and there are probably other chips that I am not familiar with that can also. Keydiver chips are no longer available IIRC.

 

[ZombieSix]

Fuel cut get bigger injectors and tune

 

[Kdouglas89]

Fuel cut doesn't have anything to do with actual fuel supply. You can replace the whole fuel system and it will still do it.

It is controlled by the ECU when it sees a certain airflow level. It assumes that you still have the stock fuel system and cuts the supply so you don't blow up your motor. You have to lie to the ECU about airflow numbers, or get rid of the fuel cut in the ECU itself.

An SAFC or something similar that reduces the airflow numbers to the ECU is a decent fix. DSMLink gets rid of fuel cut, and there are probably other chips that I am not familiar with that can also. Keydiver chips are no longer available IIRC.

I don't have the kind of money for DSMlink right now. This is the first time this has ever happened, and it was right after I got done putting my FMIC on, thats why I was assuming it was that.

 

[My1GLaser]

The cheapest fix is to get a MBC and turn the boost down.

 

[Colt4G63 also]

It's still possible you're leaking air, causing higher airflow readings, which in turn may be causing your fuel cut.

 

[Kdouglas89]

The cheapest fix is to get a MBC and turn the boost down.

Just pm'd you with a MBC question.

I will be doing the cheap leak test today. "Soap and spray bottle".

 

[My1GLaser]

Duh! I took for granted that you already did a BLT...

 

[Kdouglas89]

Duh! I took for granted that you already did a BLT...

This happened late last night, So I pretty much put her in the garage and settled down! Taking my wife to the movies, then I will be back at it again.

Also, this is the newbie forum, and I am a newbie