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SORRY FOR THE LONG POST!
I am absolutely stumped, I have a 1997 gmc savana 2500 with the 4.3 v6 and I’ve been dealing with P0300 code (multiple misfires) since I bought the van. I’ve thrown the parts cannon at it and changed these parts so far:
New plugs
New wires
New distributor
New ignition coil
New coolant temp sensors
New crank sensor
New spider injectors
New intake housing
New MAF sensor
New air filter
New fuel filter
New thermostat
New valve cover gaskets
New donut gasket on the exhaust manifold
New pcv valve
New cam shaft sensor
I’m still getting the code and it’s flashing at this point.
I took the van to two shops. One local shop and one Chevy dealer. The local shop said it might be a cam lobe. I doubt it but that was what they came up with.
The dealership said it was the spider injectors so I changed them out for the second time and still have the problem.
I am absolutely stumped.
For the record, cylinder 3 seems to be the most misfired cylinder. The compression and plugs are both good on all cylinders. I also checked voltage on most of the sensors and all of them have power.
There are two possible things I’m thinking it may be: either the timing chain is loose due to wear or the donut gasket I put in may be leaking. I can kind of hear a leak but I don’t really feel any air coming out. The reason I bring this up is because my fuel trims are around 40% and they should be at 10% so I’m wondering if air is getting in through the exhaust leak and the O2 is reading the excess air and compensating with fuel. Im not an auto mechanic but I’m reaching out because I need some help. Thanks in advance and I hope I can get this all figured out.