Any of you boys who have egt gauges fitted ever noticed the following; the gauge has started jumping around. Seems to operate ok until I reach the higher end of the normal temps. Around 600degrees. Then it suddenly drops to the bottom, flickers around and seems to stay there for a while. After a while it starts operating again. But reach 600 degrees and the routine repeats itself.

My thoughts: I've checked the probe to gauge connections. I soldered mine to avoid just this sort of thing. They seemed fine but I re made them just in case I had a bad join. No change. My concern is if it's the probe warped or cracked then I don't want it flying off into the turbo. So I set about taking the probe out to inspect it but the blanking plate bolt has rounded and I will need to remove the turbo and possibly manifold to get a proper grip with vice grips or something.

Obviously a bit nervous about driving it tomorrow and having a worse case scenario.

What are you like, Luke ?
Can`t say that mine has done anything like that - but wtf are you doing up around 600 deg ? I`ve never been near 500, so even taking off 100 degs for alleged temp drop across the turbo - sounds to me like the gauge is U/S rather than the probe. Mind you, my turbo boost gauge was put on the wrong side too and blows the tube off the back, so happy days!

What size bolts are they? I have used these ( Linky thingy ) in the past and they work a treat.

All I can say mate is those temps are exactly what I was given to understand they would be. Only goes to 600 under acceleration to 70. Cruising stays at 3-400.

Quote: fatboy wrote in post #3

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What size bolts are they? I have used these ( Linky thingy ) in the past and they work a treat.

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They just go ovet the bolt like a normal socket but inside they have a reverse cutting thread going inwards at a angle (opposite to a die). It then cuts into the bolt head and when it cant cut anymore the bolt starts turning. The bolt is useless afterwards and you will need a vise or mole grips to get the bolt out. I have also used these on a set of locking wheel bolts and it took them off no problem.

Thanks mate I'll give them a try.

I'll have a look at my set but I dont think they go down that small. If I have I can stick it in the post.

If you could check the sizes that would be great. But don't worry about posting it. I'll just get some tomorrow. Handy thing to have.

Issue resolved. My old man came along with a chisel, hit it once and knocked it loose. Probe out, no apparent damage. Not warped, bent or cracked.

Guess that leaves me with a faulty gauge then.......

Quote: Yoda wrote in post #4

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All I can say mate is those temps are exactly what I was given to understand they would be. Only goes to 600 under acceleration to 70. Cruising stays at 3-400.

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Cleaned probe, put it back in. Turned ignition on, not engine, gauge is reading 800 degrees without the engine running and the block is cold to the touch. Definitely something wrong there.....

hope so ! unless you`ve perfected cold fusion!

Ok, took the probe out one more time just to double check. And if I'm not mistaken this here: http://i1195.photobucket.com/albums/aa39...pg?t=1342725992 shows a small crack in the end of the probe. It's very difficult to show it close enough with an iphone. Just on the end a dark diagonal line going across the probe. I find it a bit odd that I fiddle with the probe, put it back and now the gauge is going off the charts where before it was dropping to the bottom.

Still, gotta take the plunge and order either a probe or a gauge...... eeenie meenie miny mo........................

Sorry bud my set is 17mm and upwards, still like you say a handy thing to have. The probe don't look to clever does it

Yeah not to worry about it. Got new bolts on there now. But I don't like the look of that probe. Seems to be worn away on the side that I assume has been facing the brunt of the hot gasses too. It's not certain, but my gut instinct says probe.....

Just bought a new probe. http://rspec.co.uk/gauge-sensors-senders...458d6e2c3efcdd9
Supposedly more betterer. We'll see how this one works out.

Quote: Yoda wrote in post #17

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Just bought a new probe. http://rspec.co.uk/gauge-sensors-senders...458d6e2c3efcdd9
Supposedly more betterer. We'll see how this one works out.

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Two wires and a 1/8th probe..........I'm guessing yes. If not new gauge

What you reckon to the pic of my probe Lez?

Doesn't make it the same sent resistance for the temps, could be that at 150 deg this is at 250k Ohms........................the old one may have been 250k ohms at 120 deg... and so will read the 'wrong' temp..

Quote: LezT wrote in post #20

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Doesn't make it the same sent resistance for the temps, could be that at 150 deg this is at 250k Ohms........................the old one may have been 250k ohms at 120 deg... and so will read the 'wrong' temp..

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Didn't know it was of a 'type' mate, sorry should be OK, but may be worth the check... just in case..

Yeah I agree. Better safe than sorry. What do you reckon to the pic of the probe I took out?

Being as this probe lived in the maniold that is running at around 600 Deg, I thik it looks in good condition

Well either way I'll change one thing at a time so we can figure out which part is at fault.