A couple of things.. check the engine fan and see if it may be hitting the shroud and making that noise. Also remove the valve cover and inspect the camshaft and timing chain.
Recently purchased a 1991 300SE with the M103 inline 6, same as yours. Mine had that "fan scrape" noise that yours has. What happened with mine is with the bracket that holds the fan and fan clutch assemblies to the front of the engine. There is not much clearance between the other accessories driven by the serpentine belt (water pump, power steering, alternator and a/c) and the fan. I wound up replacing that bracket, the serpentine belt, the fan and fan clutch to solve that problem ( that bracket weakens over time and bends toward the top, putting the fan into the pullies of those accessories and the crankshaft. If not fixed, the bracket breaks, and all hell breaks loose). It also sounds like one cylinder is not firing at all. Does it use much oil? May be an easy fix if oil consumption is low and no smoke out of the tailpipe (basic tuneup). About $500 in parts altogether and an afternoon of wrenching for both issues ;-)
@@taz300mix have done a complete tune up, plugs wires, cap rotor, replaced injectors, fuel pump, filter, relay, overload protection relay, cold start injector. As far the fan and clutch etc I was actually looking at ordering those parts and swap them out including that bracket.
Sometimes you have to take your car to a specialist to diagnosis it. You're just throwing parts at a problem that you have no idea for which it could be. It's cheaper to pay the diagnosis fee than throw the parts cannon at it. That engine sounds terrible when you started it. I wouldn't try to keep running it like that. You're going to destroy something.
@@jeffscars2713 Well take it there then. That is the worst sounding M103 engine i've ever heard in my life. It's banging and popping and will surely do damage if you keep running it to try to diagnosis it as a DIY. I've seen those cars sit for 10 years and not sound like that when started. Holy God.
A couple of things.. check the engine fan and see if it may be hitting the shroud and making that noise. Also remove the valve cover and inspect the camshaft and timing chain.
Recently purchased a 1991 300SE with the M103 inline 6, same as yours. Mine had that "fan scrape" noise that yours has. What happened with mine is with the bracket that holds the fan and fan clutch assemblies to the front of the engine. There is not much clearance between the other accessories driven by the serpentine belt (water pump, power steering, alternator and a/c) and the fan. I wound up replacing that bracket, the serpentine belt, the fan and fan clutch to solve that problem ( that bracket weakens over time and bends toward the top, putting the fan into the pullies of those accessories and the crankshaft. If not fixed, the bracket breaks, and all hell breaks loose). It also sounds like one cylinder is not firing at all. Does it use much oil? May be an easy fix if oil consumption is low and no smoke out of the tailpipe (basic tuneup). About $500 in parts altogether and an afternoon of wrenching for both issues ;-)
@@taz300mix have done a complete tune up, plugs wires, cap rotor, replaced injectors, fuel pump, filter, relay, overload protection relay, cold start injector. As far the fan and clutch etc I was actually looking at ordering those parts and swap them out including that bracket.
Sometimes you have to take your car to a specialist to diagnosis it. You're just throwing parts at a problem that you have no idea for which it could be. It's cheaper to pay the diagnosis fee than throw the parts cannon at it. That engine sounds terrible when you started it. I wouldn't try to keep running it like that. You're going to destroy something.
@@klwthe3rd the problem is the best place is 52 miles away that I would trust that is.
@@jeffscars2713 Well take it there then. That is the worst sounding M103 engine i've ever heard in my life. It's banging and popping and will surely do damage if you keep running it to try to diagnosis it as a DIY. I've seen those cars sit for 10 years and not sound like that when started. Holy God.