pajero v6 3500 gdi

would anyone have an idea on how fast the temp of the catalytic converter shoots up from cold? im having this problem with the CAT light on the dash, most times it lights up just after 5mins of driving from cold, the temp gauge hasnt even reached middle yet. and then eventually the light will go off. there are times when i hit an uphill slope, the light would come on right away but when im on descent it turns off. there was this time i was on a flat surface and the light turned on, i tried revving the car upto 5k rpm and the light shut off. (but this doesnt alwasy work) so now im thinking it might be a wiring problem, when the light was on i went under the car and played with the connectors and wires of the sensor to no success, i thought that if it was a loose connection, i could jiggle it and the light will turn off.

just this morning when i started the car, the light was already on. didnt use the car today. so i dont know if it will shut off eventually.

should i be alarmed? at first i thought that i just put in a bad fuel additive and mucked it up. but now being the light was on when i started the car, im thinking it might be a loose connection or the sensor itself

any help will be greatly appreciated

Unfortunately the GDI engines have not come to the USA, Very few here will have experience with them.

The egt sensor will be on the exhaust.

From what I read, you may have a leanout problem, causing high egt's, or just a bad sensor. Sensor should be a K type thermocouple.

thanks.

would you know if the sensor on a gen2 v6 3.0 is the same? i have one and can remove it to swap with the gdi just to test. thanks

Sorry, never saw a gdi to be able to tell. Didn't think the gen2 had egt sensing...

now that you mentioned it, im not quite sure either if it has one fitted. it does have the light on the dash though.

i looked up k type themocuple as u suggested and came across this http://en.wikipedia.org/wiki/Thermocouple#Thermocouple_comparison

does this mean i can go out and buy any k thermocouple and just wire it to the car in place of the old one? or is there something else im missing?

thanks. i ran the car though for about 100kms while the egt light was doing its things, doesnt matter if im fast or slow, it lights up intermittently though and i dont feel anything different or wrong with the car. what im asking is if i had the light for quite sometime now and im still driving it, should have there been a catastrophic meltdown of the CAT or valves? thanks

In doing some research on this, I found a lot of sources which had egt ecu fault codes. This appeared to be either bad sensors or bad wiring in most cases. Most cars have egt sensors to protect the cat or turbo, and most trip around 950*C. I don't think you can install just any type K thermocouple and have it work. It must have the right mounting hardware, and the type of electrical wire and wiring junctions you use can grossly affect the accuracy of the measurement. Buy the oem part.

ok i've verified by swapping over the part from the 3.0 to the gdi that the parts are (hopefully)the same, even the connectors and the color of the wires(the length too). i just havent tested the car yet as its already 2am when i swapped out the parts. will be testing this tom and keeping fingers crossed. at least when it works, i know what is causing the fault codes and its fairly easy to replace (depending on the part availability of course) at least i wont have worries of anything melting.

ok its confirmed, its the sensor. i swapped it out with one from my 3.0 and no probs now. well except the 3.0 doesnt have a sensor now! now i cant find the part here where i live, anyone can help me out? the part number is

md127984-3.5L 6g74 exhaust gas temp. (this is whats written on the mitsi book that i saw in the dealer)

Shows to be available but not in stock here and at www.mitsubishiparts.com.

Don't know where you are located and what shipping would be.