4.3 cranks, no start
 

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'94 s10 blazer 4dr w/ 4.3 vortec, approx. 175,00m
have spark at coil and plugs, have replaced all ign. parts (spark pl, wires, cap, rotor, ign mod) Replaced fuel pump and pump relay recently and all was fine. No codes either. I have been told by four diff. mechanics four diff. parts, starting from comp, fuel press reg, oil sending unit and egr. i was wandering if anyone had some pointers on this with so many miles. There is no click in fuel pump relay either when key is turned on and fuel pump is not engaging either with key. I do have new fuel filter to replace, but dont know if that is neccesary since no relay click is felt or heard. i know from books that oil sending unit has to work to allow power to relay and pump (is this correct). Thanks for your help.

RE: 4.3 cranks, no start
 

look at the fuel pump psi. should be 60 or so but if you have 56 or less it will not stars at all.
weak pump or pluged filter. the test spot is on the driver side behind the intake. It has a black plastic cap on it.

Make sure you get spark my dads 1993 had a module problem where it gets warm then no spark it's like 32$. You will find that the wires on the pickup coil 12$ maybe green/yellow may be bad like i found & had to replace the you need to take the dis. out and apart.
Also inside the passenger side floor area under the dash carpet must be pulled down a little bit. Is the disconect to set timing. The color of wire is tan with a black tracer. With it running you will head a diffrence when unpluged and check eng light will come on. Then you can set timming to 0 in park or drive operating temp. Clear cpu codes when done .
no spark or the right fuel psi it will not run [8D]

RE: 4.3 cranks, no start
 

ok. I found the black and tan wire. You then said set timing to zero. Could you give a little bit more detailed instructions. I have never heard of this solution b4 and would like to try it on my 94 S10 that I have been having exactly the same problem with. THanKs.:)

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