EGT Gauge gone funny

[davejones]

Driving to Onca yesterday on the freeway having just left home (maybe 5km into journey), next thing the EGT guage needle shoots up from about 350deg to about 900deg in like a fraction of a second. Naturally I crap myself and pull over in the yellow lines. While idling the engine, the needle was showing as is in the attached picture. I let it idle for a while, switch off the trol, start her again a minute or so later, idling temp still showing around 500deg, think it must be the sensor, everything else with trol seems A-okay so pull off again, then needle drops back to normal, but for the rest of the trip it bounces around (like my old city golf's rev counter needle!).

EGT dial.jpg (455.24 KiB) Viewed 1211 times

Should I be worried? I intend taking jongosi to Alpine Developments anyway for the weeping oil around the turbo /sump connection and clearly now something isnt right with the EGT.

Thanks !!

[KOOS BEST]

Hi Dave , I am 101 % sure its a thermo couple problem, had excactly the same. Also jumped from 200 - 900 deg .
Got n moerse skrik.
Found the problem to be the thermo couple wiring which I tied in a loop and cable tied it to the brake pipes on the fire wall to have shaved through and made a short with the earth.
I checked the wiring and covered the area with insulation tape and voila!

Dont worry , @ 900 + deg there would have been nothing left .

So its the coupling my friend.

[Kagiso II]

mmmmmmmmmmmmmmm,. klink vi my die dywil is los in daai enjins en hy het van sy kole saamgebring ... kon ook gese het die hel is los in daai enijins. Hm?
Maak die 'conecter' los waar hy in die manifod inskroef; borsel skoon met sagte tandeborsel en soek daai stuk roet wat daar vassit en al die hitte steel.

[O K - dis raaiskoort nommer een... jy gannie van raaiskoot nommr 2 hou nie, zo ik houd mijn bek heejl digt toe jonge.
Gaat je wel - en zijt je klaar sijn en de proe-bleempie4 baasgeraak het - kom deel bietjie
[so-ja, nou is ek wakker en dis dag en klannik sien wattik tik, so hettik bikji die splefvoutse g fieks...

[Pieter du Toit]

Oom Mac - ek stem - die verdomde duiwel is besig om te spook hier onder die 4.2's.

Dis nie lekker om die goed te lees nie - en ek dink ek weet ook wat jou raaiskoot no 2 is - ma ons sal nie spoke opjaag nie ne!!!

Dave laat check maar net daai EGT gauge, probe en wiring ASAP - jy wil nie kanse vat met dit nie!!!

Daar staan Iron Maiden alreeds........

Laat weet ons wat was toe die culprit.

Groete

[Pieter du Toit]

An after thought.....

My EGT gauge also did smething funny the other day. I was driving like usual and as usual when stopping I let my car idle for a minute or so to let the turbo cool down. I normally watch the EGT's and when it gets to around 150 I switch off....

Well this time my EGT's started to drop extremely fast - so I kept the engine running to see what happens. Within about 2 - 3 minutes I got a reading of -8 (yes minus 8 degrees!! ) on my EGT monitor - much too my surprise but knowing it is impossible!!

I just switched off the car and since then it has not happen again - so yes like uncle Mac said - seems like the devil is messing with us!!!

Maybe we must arrange a MMC weekend for our Patrols and get rid of the evil......