How do i read codes on my 87 k5 ? - 1987 Chevrolet Blazer

It has to do with the secondary air intake. first check for any cracks or leaks in the air intake system. most cars have a plastic routing tube that cracks or gets a hole in it from friction . could be even a bad clamp.check these places first. you might want to disassemble the whole air intake hose apparatus so you can really see whats going on on the bottom side.good luck ,and give me a rating if it helps,Gary

Error code 87, Cooling system malfunction.
Fault:
Coolant Thermostat - Coolant Temperature below Thermostat
Regulating Temperature
Cause:
Mechanical fault.

read the VIN Number on the block, see if it matches the VIN number on the dash or door jam.

Fuel pressure? Do you hear the fuel pump running? Read the codes to see if ECM is still alive. Do you have spark at the plugs? Remember all motors need 3 things to run air, fuel, and fire at the right time.

If you are set on using this engine for its increased power and fuel efficiency, the only way you will realize these benefits is by changing the ECM/PCM from the engine donor vehicle to yours, put the 90 model engine's throttle body back on it, use the engine wire harness from the donor vehicle--in other words, the engine has to think it's still in the Caprice, and the only way to do this is to put the Caprice electronics and fuel management system (throttle body) back on it. If you have to modify the throttle linkage, the kick-down/TV cable, to make it work, then do it. Also, you will have to put an Oxygen sensor from a 90 Caprice into the manifold/collector/crossover pipe of your vehicle, and not one for the 87 truck. If it wont fit, plug the factory hole on your truck's Oxygen sensor location with a threaded plug using high-temp thread sealant, cut/weld in a proper-threaded orifice for the Oxygen sensor from a 90 Caprice. If the Caprice had two Oxygen sensors, you will have to put one on each cyclinder bank's exhaust outputs.
Swaps such as these are great if all the details are attended to, but headaches if you just try to throw and go.
If you do all this, the codes will not come back after you reset them, the engine will run great, you will have better power and greater fuel economy (the Caprice and the Blazer weigh within a couple hundred pounds of each other), and you will have a 1987 K5 Blazer which "thinks" it's a 1990 Caprice.
And remember when buying engine parts in the future to tell the counter guy "It's for my other car--the 1990 Caprice."
You get less **** out them that way.

The vehicle should not have to be running for head lights to burn.If high beams work,then the low beam head lights could be burned out,even though they light up with high beams.The dimmer switch,can be the problem if the head lights only work on high beam.

87 octane ,,,you kidding ---more like 95 octane .But this has nothing to do with the vibration and check engine light,forget having the codes read get the dealer to look at it

I need the motor size...what liter?

The oxygen sensor needs to be replaced.

check starter relay