Will lose the ability to excelerate at times when the van is cold

Asked by Nov 28, 2015 at 02:07 AM about the 2007 Kia Sedona

Question type: Maintenance & Repair

When the van is cold, we sometimes lose the ability to excelerate.  You can pump the gas, but the motor does not even rev.  I have to pull over, and turn it off and try to restart it.  Sometimes works, other times you have to do this a few times.  Only acts up like this when it is cold.  Any ideas?

1 Answer

41,875

Here's what a guy had to say on a Kia forum: This problem lies in the TPS sensor and the manifold pressure sensor....both work in tandem ....mine did it 4 times in 1 day and it went back to dealer only to told its going to cost me 1k to fix it cuz it's not under warranty..... What happens is the crankcase vac hose that goes into the intake hose before the throttle body sucks in oil vapor....this oil vapor coats the inside of the intake manifold where the manifold pressure sensor is thus stopping it from detecting proper pressure, which puts motor into limp mode.....(no acceleration) To fix yourself, Take engine cover off and above the position of the throttle body in the manifold just to the right is the sensor....2x10mm bolts need to be removed and the sensor will come out with gentle wiggle....have a can of electrical contact cleaner on hand and douse it good to clean out the residue oil...let it dry and put back it..(disconnect the negative side of the battery first before you go unplugging anything ) next is the throttle body....3x10mm bolts and a 12mm bolt right at the bottom of it ...once these are removed it literally falls off...the cover plate on the right hand side of it needs to be removed to expose the gearing and the sensor behind the very top gear..once again spray liberal amounts behind the top gear and allow to dry and then put back together....total time to do it all 2 hrs. without rushing... reconnect the battery and start the car up.... In hot conditions this will happen all the time the only way to resolve it is to put in a oil catch can off that vac hose to stop the vapor coating the sensor..i have done it and we are dealing with 40c temps....in cooler to cold conditions this will hardly happen. Hope this makes sense to you. Like I said, I found it on a Kia forum. If you don't plan on fixing yourself, at least you now have an idea of what to tell the mechanic to replace. Good luck!

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