car sputtering at 6 psi

[boosted_4life]

okay guys here is my problem, my car runs fine if I dont get on it and build more than 5 or 6 psi, as soon as I get on it and make 5 or 6 psi the car will start sputtering and wont go past 4000 rpm. even when I have the car in park I will press the gas and when it gets to like 4500 to 5000 rpm it starts sputtering. . PLease help Im clueless.

 

[95 'clipse RS]

have you done a boost leak test yet?

 

[Killa_dsm]

Like said above check for boost leaks. Also check your spark plugs and wires.

 

[agarcia892003]

diddo do a boost leak test pretty easy to do. also check your sparkplugs.

 

[JayRolla]

Boost leak test, plugs, wires. If that dont fix it compression and leak down tests. If a valve is gone it will studder real bad under boost.

 

[shadow001dsm]

do you have a bov that your venting to the atmosphere by any chance? could be a problem if you are

 

[juanpac0]

Make sure you're not running platinum plugs. NGk BRP6ES @ .028" are what you want.

 

[jeffo]

Are you running a chipped ECU? It sounds to me like you have a chip with a stutterbox/launch rev limiter in it.

 

[mikelv]

Ha, ha yeah sounds like a two step but I doubt it.

If you had a boost leak bad enough for that, you would have an intercooler pipe probably blown off. Then again if that was the case it wouldn't run at all.

I would agree with those above in saying do a compression check, boost leak check, and check your plugs for proper gap and conditions. Let us know those results and the color of the plugs.

 

[boosted_4life]

Hey guys there is no boost leak, and compression test came out fine, is there a fuel cut solenoid in this cars? Cause If i give it gas slowly it will build like 9psi but if i get on it hard in wont go past 5 or 6psi

 

[habitatguy187]

Hey guys there is no boost leak, and compression test came out fine, is there a fuel cut solenoid in this cars? Cause If i give it gas slowly it will build like 9psi but if i get on it hard in wont go past 5 or 6psi

Still sounds like a boost leak... How long did it hold pressure? What psi did you pressurize to?

 

[Dsmj89]

Do a boost leak test, put some soapy water on all your intercooler hoses and watch for bubbles.
Also check your spark plugs and cables, they are probably worn out as well.

 

[ECFab]

^ +1 boost leaks cause all sorts of crazy issues. Its cheap. Just make one out of pvc pipe and a tire valve for 5$

 

[surfer2124]

Hey guys there is no boost leak, and compression test came out fine, is there a fuel cut solenoid in this cars? Cause If i give it gas slowly it will build like 9psi but if i get on it hard in wont go past 5 or 6psi

Did you actually do a BLT? My car ran like absolute crap with a very similar issue untill I did a BLT and found multiple leaks. There is more places for pressurized air to escape from than you know.

IC Pipe Tester

 

[Defiant]

You're using the wrong plugs, or wrong gap, or have used-up ignition wires.

Do not try to "boost" in neutral under any circumstances.