ka24de does not accelerate after 4000 rpm

[mrbassmx]

i recently buy it and doesn't accelerate after 4000 rpm.

it's a 240sx S14 95' with ka24de.

help

[okay123]

my car doesnt start halp pls

[OutToWinPAHC]

Got a check engine light.

Could be a bad maf miscalculating the amount of air the engine is getting, a bad 02 sensor correcting the wrong AFR ratio, or an injector / ignition issue.

[S14toRPS13]

That's normal for a KA

[allenms240]

is it in every gear?
Perhaps the clutch is slipping?

[mrbassmx]

its automatic, this happen in every shift, neutral , parking

[mrbassmx]

also, sometimes, there is alot of smoke, only when I start the engine or when I do a long stop (after red light)

[simmode1]

Where is this smoke coming from? Muffler or engine bay?

[nismobenzo]

the problem with mine was the butterfly valves NOT opening like they are supposed to..
now i go hawwd!

[mrbassmx]

Where is this smoke coming from? Muffler or engine bay?

muffler

[MS-13_240SX_91]

I had the same issue on my 91 s13. it was kindda revving like i have a 2 step installd but i dont. AND mine doesn't rev higher than 2300rpm and it doesn't idle either. the problem was my MASS AIR FLOW METER. at first i clean my Mass Air Flow sensors with BRAKE CLEAN. it did work well for a couple of days. then did the same thing again. so i order my MAF sensor replacement on ebay for 175 free shipping. well you might want to check on your MASS AIR FLOWMETER SENSOR.

[OM3GA]

MASS AIR FLOWMETER SENSOR.

[mrbassmx]

sorry for my english..

isn't the maf. I already tested with another maf.
If I rev like honda boy to the 4000rpm, there is a smoke cloud and my ka24 can rev to 6500rpm.

I can only rev to 6500 when the smoke cloud appears (sound like a explotion) , and this only happen when I floor it the gas pedal in 4000rpm until the smoke cloud appears. Then my engine can go to 6500 rpm (red line).

[1updrifter]

It could be a pinched fuel line causing a restriction allowing car to idle but caps rpms when the demand is greater than the allowable pressure in the system due to that pinched line. Hopefull you don't take your car to jiffy lube