1998 Chevy Truck
Bent valves would be number one cause. Check the timing. If you lost time, your valves are tapping the pistons causing the knock. When the valves tap the pistons they bend and don't close all the way, so the cylinders cant make compression.
SOURCE: 4.3 vortec engine , engine noise, knocking or
The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.
Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Regards,
SOURCE: My 1998 Chevy 2500 vortec 4.3 v6 van starts and dies instantly
sounds like your engine immobiliser fuel cut off is activating.try taking battery teminals off,re-connect and re activate your immobiliser fob the usual way,**** it will re-set itself,& or your fob battery may need changing,it,s anti-theft cut off that is your problem.good luck.
SOURCE: i need the firing order diagram for a 1977 chevy 454 engine
1365472, 1 3 5 7 are on the pasengers side 2 4 6 8 are on the drivers side.
SOURCE: how do i set timing on 1998 chevy truck 350 vortec
number 1 plug wire should be pointing towards the front drivers corner . drivers side piston order is 1-3-5-7 front to back .passengers side front to back is 2-4-6-8 then the firing order is 1-8-4-3-6-5-7-2 . if you pull the # 1 spark plug and put your finger in the hole /remover power wire while doing this at the dist.bump the engine when you feel a rush of air that's the compression stroke when the piston is at the top of it's compression stroke . pop the cap look to make sure the rotor is pointing at the # 1 piston roughly and place cap back on so the # 1 terminal is over the wire end of the rotor contact tip and work clockwise around with the firing order and hope this helps .if it still dont want to run then you may have jumped timing chain or stretched they will jump out of time and cause a headache.
SOURCE: 1996 chevy 4.3 vortec multiple missfire p0300 i
Had this problem, had new crank sensor put in, new timing chain and gears. Before that though we did plugs wires, cap, rotor. DO NOT use advanced auto cheap stuff, USE ac delco. after that put a new motor with all of the above new again. Here it was the computer on the radiator overflow tank on the inner fender well. Someone has unscrewed it and it had condensation in it. These are 150 new but you have to have someone flash it in to the motor.
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