Any odd noises? Any mods? Did it just start doing this?
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This is a discussion on boost problem within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; my 2003 wrx runs good when its cold once it heats up it doesnt boost until 5100 rpms it kinda ...
my 2003 wrx runs good when its cold once it heats up it doesnt boost until 5100 rpms it kinda stutters before that any help would be greatly appreciated
no it has done it since i put in a different motor no leaks got it pressure tested, changed obd2 sensors tps sensors
What are the mods?
I had a similar problem (ran fine cold, once it was warmed up it would start cutting out with anything over 13psi boost), it turned out to be a failing coilpack.
Down pipe bigger intercoller exhaust
I would take a look at the plugs, maybe just change them since they're cheap, go over all the grounds and make sure they're clean, then try changing the crank and cam timing sensors.
You should datalog to see if you can find anything abnormal going on. One of the hints we discovered while trouble shooting my car was the fact that the RPMs would drop in the logs even though the car was still accelerating.
no what kind of tune would you do?
A protune will always be better than an OTS map.