help please i cant figure it out :((

[mike fonseca]

I have a s13 with a ka24de my car runs perfectly fine n idle fine as well but as soon as I go in the free way or any time I go past 4k rpm the car bogs out it jerks back n toward n won't go past 4500-5000 rpm just jerks back n toward till I let go of the gas I've changed the fuel pump ,knock sensor,o2 sensor, I cleaned the maf n the tps n still nothing Idk what could be wrong with it some one please help me :((

[lexlaxlux]

Did you check your timing? Upgrade cams? Anything you did to the motor before the problems had begun?

[mike fonseca]

No timing is good n no motor is bone stock problem just came out of no where I did a full tune up n still bogging won't go away n I have no check engine light ether

[lexlaxlux]

NO CEL usually indicates you might have something minor affecting a larger counterpart

I would suggest to you if you say that everything listed above had been checked--


-Recheck your Fuel pump and check for metal shavings around the filter
-Grab a friend and have him turn on the car.. Rev it up as you wiggle the engine harness for any shorts or bad connections
-If worse comes to worse pop off that valve cover and start looking inside.
-Rocker arm (shim buckets) & chain guides... notorious KA's


these all could be possible factors but it really comes down to everything you check and if you can eliminate all the non-existent problems

if its not electrical and something minor top end then SOL.

[STEEZxIT]

IACV. try to clean that.

[mike fonseca]

Ima try that thanx guys

[nismoman]

Sounds like an ignition system problem. Check coil ,distributor cap, rotor, plugs and wires

[slider2828]

Sounds like that or a FPR problem.....

[Kiro1968]

Since you replaced some components already, follow the Service Repair Manual and test the Camshaft Position Sensor, Crankshaft Position Sensor and MAF (actual test and not just cleaning it)

[murffy]

yea check the iavc and the voltage of the injectors and if ur injectors are good u might be running lean cuz of injectors being dirty or done put an after market fuel pump