2G Car Bucks at full throttle and full boost.

[0r1landoDSM]

i have a bone stock 95 gst with an evo 3 16g.. is this boost leak? the car will only buck at full throttle full boost. earlier today my lower intercooler piping shot from the sidemount

 

[WES_393]

Yes I'd say that sounds like a boost leak, especially if couplers are popping off. Make sure all the clamps are tight and that the hoses/pipes/couplers aren't damaged. Then do a boost leak test.

 

[jpmxrider489]

How much boost you running? Ive had couplers blow off but thats because I was dumb and forgot to tighten the clamp. I would do a boost leak test. The throttle body is the most common. If it bucks could the turbo be going bad?

 

[0r1landoDSM]

turbo is new & im running stock wastegate pressure. didnt touch the boost

 

[Blacked-out]

## prof. says u have a n/t is the turbo put on as an addition? or stock with one?

 

[dsm03]

Check your spark plugs.

 

[Fast-Orange]

sounds like a misfire, do a tune up its the first easy step, spark plugs, wires, fuel filter pcv valve, clean your throttlebody and maf sensor. if there the stock wires they commonly cause a misfire in these cars underboost defenitly change them.

 

[chadjoe]

Did you put bigger injectors on the car?

 

[0r1landoDSM]

im running denso platinum plugs right now, i did research on the site and in my current stage i need NGK br6's ill try them out and see how it goes.. when i hit full boost full throttle i also hear popping then it stumbles and i lose power (happens with denso platinum plugs) & im too lazy to update my profile on here so i just left it as my old car(my 98 n/t)

 

[jed344]

is it like a hitting a brick wall kind of buck of a easier like power loss kind? if its very brutal id say fuel cut but on waste gate pressure id find it hard to believe you are hitting fuel cut.

 

[Moy]

Definitely sounds like you're hitting fuel cut. Boost leak test (pressure test) the intake system, leaking out of a couple or a torn hose (if on stock piping) is common on older turbo'd cars, leaking from a gasket on the intake manifold somewhere is less common, but possible. Also check your vacuum lines for cracks or tears, make sure your BPV/BOV is functioning properly and that the diaphragm isn't torn, etc.

 

[4g63thermal]

definitely sounds like fuel cut.

Check the line to the actuator could have a small leak allowing more boost pressure to build before opening. wich would give you a higher boost level hence the fuel cut. do you know how much pressure your building up?

 

[JONSHERER]

sounds like boost could be blowing out the spark

 

[stellhornata]

sounds like a boost look or a random vaccume line has been blown off. check for cracked line.s

 

[ChrisTheBuilder]

sounds like boost could be blowing out the spark

+1 check your plug gap

 

[brock_760]

hello i have the same problem with my gst 95 once i hit 8-10psi it feels like the car comes out of gear or like hitting a wall could it be my wires or plugs what would be the first things i should do and is it bad on the car?

 

[Diamond Star Werks]

Fuel pressure too high, plug gap too wide, bad/crappy plugs, bad wires, BOOST LEAK. Alot of things it can be.