Had to take a break for life.
Got some vac lines & things coming from Pelican.
Need to call to see if they have larger black rubber line in meter length.

I tried to test out the tg on the Volvo.
Had it just idling so it wasn't so hot.

Exhaust pipe coming out of engine read in the low 400 degrees.
A aluminum tubung was about 160 & I noticed a small pinhole in it.
I tested the pinhole temp & it was 220.
So the gun was able to find that leak which was hotter.
I'm guessing that the temp gun is working correctly.

I tried to get the temp at the cat & in front & back but I never got temps over 160. The car was not that hot & it was just idling.

I'm going to have to see what I did wrong as I'm thinking the cat should be hotter in the Volvo. I've thought I heard the dreaded rattling a few times so it might be toast. It was replaced a couple tears ago with aftermarket.

I'll have to call around still.
Having trouble finding a smog repair that can deal with a 30 yo MB

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83 500 SEC Euro 198K