mk4r34

iTrader: (1)

I have a 93 5spd with 150k.I have been trying to diagnose and fix my low/rough idle at start up in warm/hot weather since last year but,can't figure it out.Now for the past week when I drive on the hwy and come off to a stop there is a strong burning smell coming from under the car.It's not a rubber or plastic smell but,almost like a metallic smell?Only thing I can think of is it might be the cat?

I have:
replaced coil,distributor,wires,plugs
replaced coolant sensor,02 sensors
fixed ecu leak
checked/cleaned hoses,pcv,maf,egr etc

I'm at a lost.

Any help or advice?

Thanks

mk4r34

iTrader: (1)

Bump for any feedback on the smell?

SC400slide

iTrader: (11)

Listen closely, if there is a hissing noise, that means there's an exhaust leak. Look for cracks in the resenators and catalytic convereters...are the red hot?

mk4r34

iTrader: (1)

I think I have found the smell which was a burning/floral smell.When I got under the car there was some kind of plaster similar to liquid nails melted on before the Y pipe so I scrapped it off.We will see about that but,now that you mentioned the hissing noise I have noticed past few months with the window down when I get on it and shift there is a hiss sound very similar to a soft blow off valve coming from the engine bay.Any ideas where to start?I looked for leaks while I was under the car but,I didn't see any black exhaust residue where any leak would be ?

SC400slide

iTrader: (11)

I have a crack in the weld on my "CA Emissions" resanator that is empty and not used. If the hissing is coming from the engine bay, I doubt it is an exhaust leak you're hearing, but you might as well check the exhaust manifold, then all the way down to the resenator.

Does liqiud nail smell like fuel...?

mk4r34

iTrader: (1)

I'll take another look later.I know the manifold is practically seized on.The smell is weird.It smelled like something was hot and then it was a floral smell?It was putty that was melted ob the pipe.I do smell a rich smell on start up though.