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My 1991 s-10 blazer with a 4.3 v-6 had the oil filter mounted under the hood behind the left headlight...there will be two lines that come from the block to the remote filter located there....hope this helps....Larry
I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.
It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift.
Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps.
A puff of smoke when you start up indicates worn valve seals.That's why all your work didn't fix the problem and it doesn't show a code. It's a pain in the --- job that requires some specialized tools so I guess it depends on how bad it bugs you,if oyu want to fix it.
I have an 89 s10 blazer with the 4.3 tbi. the oil filter is a remote oil filter. there are two hoses running from the engine to the filter, which is located in the engine compartment in front of the left front wheel. it's mounted to the side.
try yhe pickup coil or ignition module wich are both located on the distributor or the igniton coil.im going through the same thing.all i have left to try is the ignition module.if i get it ill be sure to let you know