Bad hesitation problem when stepping on the gas hard

[RedTopDrifter01]

I have a 91 s13 silvia sr redtop and I have a bad hesitation when I step on it it is all stock but intake,exhaust and bov can anyone help me.

[Team DET]

bad maf.............

[SleepR 240sx]

Define bad hesitation. Doesn't boost till 5k? What? You have to tell us more if we are going to help you.

Check MAF like he said, also could be a boost/vaccuum leak. That's all I can tell you with what you've said.

[RedTopDrifter01]

I have fixed all vaccum leaks that I can find and about the hesitation I dosent do it as bad when I shift really fastand keep on the gas as much as posible but when I shift normal then step on it a little it hits full boost right away and it hesitates still for couple seconds then it all the sudden just goes and pulls hard.some friends I know said it could be a fuel pump or fuel pressure regulator.oh and the car also has a exeddy clutch if that matters at all.

[Finchie]

I had the same problem and thought it was a boost leak.

Changed the fuel filter and fixed it right away.

[Okinawandrifter87]

Try this.. clean out your maf, get a new fuel filter and run some fuel cleaner through the system.. and if you really dont have any boost leaks then you should be set again. Try that and come back and let us know what happend or how it worked out for you.

[RedTopDrifter01]

hey i did chand the fuel filter, fuel cleaner, and cleaned the maf and the car dosent run any better still no quick response like it should do you or any one have any other sugestions to the problem.

[slow40sx]

sounds to me like your knock sensor is not grounding out properly, i had the same problem

[mehsilvia]

MAF is generally the first place everyone looks, but dont forget to check your Throttle Positioning Sensor (TPS) as well.

Get the FSM and an OHM meter and see if its working and to spec.

[ballinnmiami240sx]

timing? this happen to me after rebuilding my engine. if its to retarted it will hesitate thru the whole rpm range.