NO POWER AT TOPEND
09-15-2008, 09:57 PM
#1
2nd Gear Member
Thread Starter
Join Date: Mar 2005
Location: PA
Posts: 174
NO POWER AT TOPEND
MY gt runs great but at around 4000rpms it seems to loose power, i changed the fuel filter, the fuel pump was upgraded to a 225lph and i did new plugs and new msd coil ....i cant figure out whats going on, i cleaned out my mass air meter too and also took out the holley fuel pressure regulator and put a stock on in place of it, because it wasnt adjusting(more or less pressure) any ideas or thought would be great, thanks
09-16-2008, 08:30 AM
#5
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
do either of you have a cam installed?
can you describe it more detailed. does your car feel like it hits a wall, like literally cannot pass ~4k RPMS? i've experianced this once but it was after a cam install. common with that kind of mod is valve float due to inadiquate vavle seat pressure. old springs get this way too. its possible this may be what your experiance. especially to the OP who's replaced their coil.
but also another suggestion is the dizzy possible. there is an assembly inside that can go bad that also may cause this.
can you describe it more detailed. does your car feel like it hits a wall, like literally cannot pass ~4k RPMS? i've experianced this once but it was after a cam install. common with that kind of mod is valve float due to inadiquate vavle seat pressure. old springs get this way too. its possible this may be what your experiance. especially to the OP who's replaced their coil.
but also another suggestion is the dizzy possible. there is an assembly inside that can go bad that also may cause this.
09-19-2008, 11:19 AM
#8
in limbo
Join Date: Jan 2007
Location: Iowa
Posts: 7,300
sounds like what my car did. sounds like valve float. do you know if you have an aftermarket cam. they usually only do that with stock springs + aftermarket cam unless the aftermarket cam was installed with incorrect aftermarket springs.
