View Full Version : 240sx another rough idle/boggy

09-16-2012, 04:40 PM
hey all after about 3 days of research and testing i have come up with nothing

that being said my problem is i have an 89 stock 240 auto i bought 3 or 4 weeks ago. The idle will go up to 1k sometimes and go back down after a while. the car bogs 3 times before it will go higher then 1700 when i first start it untill it warms up good. i have a fuel preasure gauge before the fuel rail that never drops durring the bog and always is consistant with my throttle position so i dont think its a pump problem.

ive done the regular stuff cleaned distributor and cap, changed wires/plugs, changed fuel filter, changed air filter checked all injectors replaced one of them, tried checking all vacuum lines may have missed one tho not sure.

is there anything i can do? im going to clean my maf today but running unplugged it runns a lot worse.

i thank anyone for help with this i hope i provided enough info thank you

09-16-2012, 07:09 PM
kinda sounds like a vacuum problem to me ..does it idle like this just at start up . or does it do this all the time?

09-16-2012, 07:42 PM
just at idle seems to b better when warming up

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09-16-2012, 08:36 PM
^wtf? spam bot?
didn't know zilvia was turnin into a cialias/viagra site now.

OP. sounds like a vacuum leak or a bad IAC.

09-17-2012, 01:56 PM
Cylinder heat temp switch may be bad also. That is where I would look.

09-17-2012, 03:52 PM
ill check that next i checked all vacuum lines doesnt seem to b bad and ill check iac after temp sensor

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09-17-2012, 04:33 PM
Check the Coolant temp sensor. Hook it up to a volt meter to check resistance as you heat it up with a lighter

09-18-2012, 01:57 AM
i ended up changing it. it was coroaded and messed up anyway it fixed everything

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09-18-2012, 11:15 AM
thank you so much for all your help guys

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