P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
Start with a tune up.
vacuum leak
No minor thing you can do will really increase H.P. to any significant degree. Installing a supercharger would give you a significant increase.
No. They are two entirely different systems.
P0300 = random misfire. Could be as simple as needing a tune up.
P0030 - HO2S heater control circuit (bank 1 , sensor 1) P0300 - Random/ multiple cylinder misfire detetected
Most likely brake fluid. Check the master cylinder level.
check for bent or burnt valve check for bent or burnt valve
Oldsmobile didn't make a Cutlass Supreme in 1998
Could be a bad ignition coil, a bad ignition module, or bad gaskets on the manifold(s). I'm assuming you've already replaced the plugs and wires or they're fairly new.
How to change a timing chain in a 1998 Oldsmobile delta 88
The 3.4 liter V6 engine in a 1998 Oldsmobile Silhouette has a timing CHAIN
Check the spark plug and the plug wire. If that isn't the problem then check compression. You could also have a bad fuel injector.