SOURCE: 89-98 chevy blazer
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.
SOURCE: P1345 CODE ON 1996 BLAZER
I have seen the answer as stating it refers to "crankshaft sensor" had gone bad, 5 min job. Hope this helps, if nothing else, as a place to look.
SOURCE: OO DENALLI GOT 4 CODES P0134 P0161, P1345 AND
po134 is o2 sensor bank 1 sensor 1
po161 another o2 sensor
p1345 crankshaft position sensor
possible cause for o2 are vehicle control module (PCM) or wiring
SOURCE: i have a 98 chevy z71 5.7 350 vortec, i have a
1345 is cam and crank sensor correlation its mainly the cam sensor going out, also the delay start that also trigger a camsensor code they call it excessive crank time check the fuel pressure that is capable of setting a cam code (1345) If fuel pressure is good (55-60 psi) expect to replace the camsensor you might as well do the crank sensor heres a nightmare on this code it can set if the distributor is off one tooth and yes these distributor have high failure rate
These engines are common for running really bad when coolant temp sensor is bad. Disconnect it and see what happens. That way you can discard those little things. It located on the intake plenum.
If problem persists I would have someone check fuel pressure.
I hope this helps!
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