once my car hits vtec, it bogs out and doesn't seem to want to move. it hesitates right after vtec hits.
motor is a jdm gsr motor
dc sports header
skunk2 IM
cai
msd ignition kit

i had a b&m fpr on with the fuel pressure set at 40 psi. i also had a walbro 255lph fuel pump in because of the zex kit that have that i never use .

i took the fuel pump and the b&m fpr off and put the stock ones back on so far.i thought i may be running rich due to the fuel pump. i have also changed my spark plugs. when i took the plugs i had in the motor out, the threads had black on them and the electrode part was kinda brownish/blackish in color.

i haven't driven the car yet because its been raining. anything else i should look at that might be making my car do this?

 

also...if i gradually let the rpms go up, the car does fine, but when i really get on it, it will hesitate in the upper rpms.

i was thinking i was running too rich with the wablro fuel pump, but i'm not sure.

 

any cel's?

 

check timming and oil pres make shure u have oil when u dont have enough oil or good oil presure it wil do that

 

oil pressure was reading good.

do you mean the ignition timing?

no cels

 

check your oil pump it may be dying since you have a JDM GSR motor.. they do like to drive the **** out of those cars... since they have to change the motor every 40,000 miles

 

DO YOU HAVE A ADJUSTABLE FUEL PRESSURE REGULATOR IF YOU DO YOU AARE PROBLY DUMPING TOO MUCH FUEL THAT WHAT HAPPED TO ME.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silverEG6 &raquo;</TD></TR><TR><TD CLASS="quote">since they have to change the motor every 40,000 miles</TD></TR></TABLE>

This is one of the biggests myths out there. It is not true.

 

if you have a cat . your cat can be clogged. Thats the same thing my car did . Once it hit vtec it just died. Oh and check your fuel filter. hope you get it fixed

 

the same thing happened to me before i changed my fuel pump i say put the 255 back in and the regulator and use some new plugs
what plugs are you running anyway the regulator might be faulty get another kind

 

ok just answer me this, do you have any check engine lights

 

no check engine light.

i had some ngk spark plugs

don't you think that the walbro pump is too big?

i put the stock one back in. went for a drive today and gradually got on the
car. it felt pretty good. i didn't get a chance to really get on the car though.

i'm thinking of getting a gsr fuel pump.

oil pressure is reading good on the oil pressure guage.

it could have been the plugs, i dont' know.

 

i have heard of this happenin to people, vtec opens but at about 7K it lags a lil bit, and they claimed the IM caused it (skunk 2) i dunno if this is true or not, maybe someone that knows more can give some input, just throwing that idea out there cuase i heard it on several cases, but like i said it could not be true.

i think it is becuase the im helps on peak hp but hurts midrange and tourque a lil bit?

 

my car is the same thing pulls in vtec but past 7k it dies almost no power up there. going to replace the distributor cap and rotor some new plugs and see what happens. i also got a b&m fpr and walbro those are getting replaced as well

 

another thing what ecu are you using. when is vtec engaging. check your msd. bogging normally is due to rich of a fuel mixture. power loss could be alot of things. Again do you have a cat on your car. if so unhook it and drive without a cat . see if that helps.

 

i'm using a kenji chipped p28.

i don't think its cause of the IM though.

msd is working fine.

spark plugs look good after i removed them. nice brownish color.

i don't have a cat.

 

You might want to check your grounds that can cause some weird problems.

 

all grounds are good.

 

You are going to hate this idea but put it on a dyno and hook a wideband O2 sensor to check the A/F ratio. I agree with everyone else that it sounds like a fuel issue either too much or too little the only way to be sure is to dyno.

 

thats what i was thinking also.