I have purchased probably one of the best engines ever made, GM 3.8 V6 3800 Series II (L36) Code K. It came with a 99 Buick LeSabre Custom attached to it and at 122K it is in pretty good condition. It has the usual issues that came with subsequent models, bad horn clips in the steering wheel which is why the 15 amp fuse is pulled, some window buttons aren’t working, the fuel gauge goes all over the place after you fill it up then ends up staying at forever full until you get to 1/8th then it goes to empty and notoriously bad with coil packs causing, I hope, the P0303 cylinder misfire. I have a barely noticeable rough idle when at a stop, no noticeable power loss when accelerating, but I don’t know how it ran without this code and it lurches under 10 mph when coming to a stop.
I did notice a decent crack up the side of the 6/3 pack and I figured out the firing order and traced the wires to the correct cylinders from the coil packs because they were mislabeled due to being bought off different junkyards. I am waiting to have shipped to me a new set of spark plugs, wires and 3 coil packs, (no ICM until next month, on a budget) all GM OEM because I hear that the aftermarket coil packs top out at around 15/16 ?ohms or amps? when the original should be topping out around 10? I haven’t done the engine running pulling the cables off each pack to check for spark yet, been sick, and it seems unnecessary since I’m replacing them anyway. So hopefully it’s that and not something like a piston ring…WAIT I can just swap coil packs to another set of cylinders and see if the code changes to another cylinder!! Okay.
I do have another question. On cold starts I hear a quick ticking sound from the engine that goes away after 20 seconds and doesn’t return while running or accelerating. Specs say to use 10W30 and I checked the oil which is within the top of the crosshatch and the filler cap doesn’t have any foamy oil on the bottom of the extension piece into the top of the engine. I’m curious if this is a normal aging symptom that can be cured by turning up the radio and forgotten or is this a serious problem?
Also, should I stay away from using these once…Seafoam in the fuel tank and Lucas Oil treatment or Royal Purple in the crankcase? I’ve heard that on older engines using these can hurt more than help by removing carbon that was plugging leaks in the manifolds or elsewhere.
Thank you. I know it’s a lot and any advice would be greatly appreciated. I’m 44 and a novice but I have been able to change calipers, rotors, transaxle, oil changes and filters.