ka-t problems

[rb26iwish]

my ka-t setup is finally running the only problem im having is it wont stay on if i take my foot off the gas the car just shuts off everything else is working fine this is my only problem it drives fine but if i stop and take my foot off the accelerator it shuts off my ecu is already tuned by efi specialist so what could the problem?????

[DevilMB3017]

That's a pretty crazy eletrical bug.

My first guess would be something with the TPS (throttle postion sensor) or the gas pedal acutally shorting something out itself.

Does only the motor turn off? Or do all accessories turn off as well?

[rb26iwish]

well it sounds like it wants to stay on and the it shuts off check engine light does come on so just the motor shuts off

[DevilMB3017]

Well that is different then.

I would start by checking the IACV, your idle air control valve. It lets air into your engine at idle without the throttle opening.

If you don't have one, I'd highly suggest getting a copy of the factory service manual (just search for 240SX FSM) and following instructions for cleaning your IACV and possibly turning your idle up.

[480sx]

So you dont lose power to your car? Your driving along, take your foot off the accel and the engine just dies but everything else stays on?

[bruinbear714]

Sounds like the good old MAF/blow off valve problem.

Try recirculating your BOV.

[rb26iwish]

yeah no loss of power its only when i let go of the accelerator is when it dies

[DevilMB3017]

Does it idle on start up?

Bruinbear's on to something with your MAF. Is it recirculated or venting to open atomsphere?

[rb26iwish]

no it goes up to about 2000 rpms and bogs down unless i keep my foot on the gas my bov is not recirculated. there is one thing my hot pipe is made from flex pipe from andance auto parts do u think that pipe could be the problem????

[480sx]

Well it sounds like you have a bad maf, and possibly some boost leaks.

Go through the FSM and diagnose your problem, see if its a bad MAF. If you cant rev over 2000-2500 under any throttle condition like it hits a rev limiter and it just bogs out, unable to rev, you most likely have a bad maf.

[DevilMB3017]

I would check the grounds of your MAF connector.

Check all connectors for boost leaks.

Probably get a 'real' I/C piping kit, eBay ones are acceptable.

Make sure your IACV is clean and has air going into it.

Try to recirc your BOV.

[rb26iwish]

thanks i'll try another MAF work my way up seein as how i have one lying around

[WDRacing]

I may be grasping here but...have you tried simply increasing your idle speed? Always do the easy and cheap stuff first...if the MAF was bad it wouldn't rev over 2500 rpm.

WD

[rb26iwish]

after replacing the MAF the car still shuts off on me but when i leave the maf unplugged it stays on i also noticed coolant comin from the intake manifold...

[rb26iwish]

everyone it was the intake manifold gaskets and after playing with the MAF it finally picked up and sounds good thanks for your help