Hey guys

I have an 86 Z28 305 TBI with 38000km on it and after a good run i get this strong smell of rotten eggs/unburned gas when i stop. Any ideas?

 

Gifix,

Welcome Aboard!

A car with such low mileage likely has the original cat converter. The odor you are detecting is probably a converter that is getting hot enough to "light off" (reaching a high enough temperature to effectively convert exhaust gasses) after a short cruise. Since the converter is essentially new at that mileage, it will still produce excessive sulfur odor, and is completely normal. If it continues after prolonged operation, your mixture may be excessively lean and the converter is getting too hot. That would require a little further investigation.

Incidentally, a 1986 Z-28 was originally offered with either the E4ME carburetor fuel system or the TPI system. TBIs were not available until 1988, and unless you have a car that was converted, you probably have as TPI. Does it look like this under the hood?

 

Actually it'a a 4 barrel carb, so i guess it's neither TBI or TPI
I guess i have a lot to learn about my car yet. Thanks for the info.

 

Rotten egg smell , sounds like cat bad.90% sure.

 

The reason i say this is if this car runs rich for long time ,it will ruin the cat fast for it can't take that type of heat. vader would know better then I.