badmix
1/2 ton status
My '84 K5 Blazer has 305cid, 700r, mechanical fuel pump. The truck has 165k on it, but one of the shops doesnt think its org. motor. It has GM performance sticker/valve covers and the dip stick tube is on the drivers side, I guess trucks of this year have them on the pass. side. so not sure. Havent ran the motor vin yet.
Anyways............it has developed a weird ticking/knocking sound. Cant seem to figure it out.
I just changed the oil a few weeks ago, it started soon after that. I thought it might be exhaust gasket, so I changed out the header gasket, wasnt it. Pulled valve covers, check, everything fine there. Pulled all the belts off and fired up truck , still ticking.
Here is the weird part, when I first fire up the truck, it wont do it, but after 30 seconds or so, the sound will start out faint and then get a lil louder and then stay. If I rev motor, it goes away or maybe I just cant hear it, lol.
It seems to be more noticeable on the passenger side. When I put the A/C on , it goes away (load on motor). When I put it in gear while its ticking at idle, itll go away a lil bit.
One forums suggested flex plate, another suggested crank pulley, so have no idea, dont want to throw parts at it. so far been checking the things I can for free.
Other then the ticking at idle (which is not normal), truck runs fine, no smoke, no sputtering, runs like it always have. Jus weird that it would make noise after 30 seconds of running.
One shop and even seen on the 'net, was saying the oil filter, I had a Puralator Pure One, but went a head and swapped it out for an AC Delco (was given to me for free), so didnt hurt anything. I always fill the filter before engine start up on oil changes and always use the correct amount.
Some things I thought about but not sure;
Mechanical fuel pump ? but it runs fine, holds 6-9 psi
Something under the timing cover ?
Exhaust leak, but it doesnt really mimic an exhaust sound.
The ticking/knocking sound is metallic for sure.
Anyways............it has developed a weird ticking/knocking sound. Cant seem to figure it out.
I just changed the oil a few weeks ago, it started soon after that. I thought it might be exhaust gasket, so I changed out the header gasket, wasnt it. Pulled valve covers, check, everything fine there. Pulled all the belts off and fired up truck , still ticking.
Here is the weird part, when I first fire up the truck, it wont do it, but after 30 seconds or so, the sound will start out faint and then get a lil louder and then stay. If I rev motor, it goes away or maybe I just cant hear it, lol.
It seems to be more noticeable on the passenger side. When I put the A/C on , it goes away (load on motor). When I put it in gear while its ticking at idle, itll go away a lil bit.
One forums suggested flex plate, another suggested crank pulley, so have no idea, dont want to throw parts at it. so far been checking the things I can for free.
Other then the ticking at idle (which is not normal), truck runs fine, no smoke, no sputtering, runs like it always have. Jus weird that it would make noise after 30 seconds of running.
One shop and even seen on the 'net, was saying the oil filter, I had a Puralator Pure One, but went a head and swapped it out for an AC Delco (was given to me for free), so didnt hurt anything. I always fill the filter before engine start up on oil changes and always use the correct amount.
Some things I thought about but not sure;
Mechanical fuel pump ? but it runs fine, holds 6-9 psi
Something under the timing cover ?
Exhaust leak, but it doesnt really mimic an exhaust sound.
The ticking/knocking sound is metallic for sure.
