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Topic
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My 97′ Oldsmobile Bravada 4.3 has been nothing but a headache the last few months. I have been on here several times trying to get opinions on my P300 code (Multiple Random Misfire). Spent tons of time trying to track the misfire down, bought tools, learned how to do tests by watching ETCG video’s. Not a lot of luck so far. Anyways…
*New Issue
While I am still having the misfire, I have now been experiencing what I think could be a ground issue. While I am in drive if I hit a speed bump or pothole (even a small one) the vehicle gives a sudden jolt in the system and several lights flash on the dash. Brake light, ABS light, and even the seat belt light (even though I have the seat belt on) will flash. It seems to almost have a complete power surge. I have checked my battery connections, alternator and pulley connections and bolts to insure none of the obvious loose connect possibilities. Any idea’s on what might be causing this? Would a transmission issue cause this?
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Replies
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No, that doesn’t sound like it has anything to do with your transmission.
Places to check:
Battery terminals. Make sure they are clean, corrosion free, tight. Make sure that where the wire goes into the terminal is tight and free of corrosion also, not just where the terminal connects to the battery post.
Starter, make sure the big positive wire from the battery is tight, and the connection is clean.
Body, there is a negative battery cable that goes to the body of the car. Make certain that connection is clean and tight.
Fuse / relay box. Often, there is a positive wire directly from the battery to one of the fuse / relay boxes under the hood. Make certain that connection is tight, and that all fuses in that box are inserted all the way, and / or any fuses that are held in with screws are tight.
Alternator, make certain that the big power wire on the alternator is tightly connected.
Engine / transmission grounds. There will be a number of grounds between various points on your engine / transmission, and the body / frame of your car. You need to check each and every one of these to make certain none are broken, corroded, or loose.
Finally, go over your battery cables from end to end and make sure they haven’t rubbed against anything, or come in contact with anything hot, causing them to short. Pay extra special attention to the positive cable, anywhere that it goes near anything, including clamps that hold the cable in place, inspect and make sure that the insulation has not been compromised.
It seems kinda odd that it would keep giving you a p0300 code but not blame a cylinder. I have a car that would set a p0300 code if it could. The code for the test I shut down in the computer. My car has a manual transmission and the code was being set due to vibrations emanating from the drive train. You can see there why it never settled on what cylinder was bad. So, anyway, if all you get is p0300 it might be something other than a misfire. Maybe it is related to the flashing lights on the dash problem.
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