1988 Chev S-10 Blazer Hesitating - Engine

Question: I have a couple of questions.. I have a 88 4.3 TBI s-10 blazer 1- When I start the truck, it takes about 3-4 turns before it starts. I just gave it a tune-up and it still does it. What is the EGR and EAC and what do they do? Do they cause the rough idle my truck has. What is that cylinder-like unit of the right side of the distributor cap. What kind of sensor is it.

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Technican: EAC Valve: electric air control valve. This is the GM version of a diverter air gulp valve, providing three functions in a single valve: the normal diverter valve function, i.e., it diverts air on rapid increase in manifold vacuum; it relieves pressure by diverting air to the air cleaner when the air injection system pressure exceeds a certain set level; being solenoid-controlled, it allows air to be diverted under any desired operating mode. EGR- Exhaust Gas Recirculation valve. Introduces exhaust gas into the intake manifold. The exhaust gas is reburnt which causes the combustion temps to decrease (high temps causes pinging and an increase in harmful exhaust gases). Some things to get started. 1. A vacuum leak can cause hard starting and rough idle. If your main problem is a vacuum leak the engine will run better at higher rpm's. An egr valve that is partially open at idle is the equivalent of a vacuum leak. Once all other vacuum leaks have been eliminated remove the egr valve and block it's passageway and see if idle improves. 2. The extended cranking time to start engine can also be caused by the fuel pump not running as it should. Listen for the fuel pump to prime for a couple seconds when you first turn on the key and when engine is cranking. 3. Scan the computer for troublecodes. Easy to do, need instructions?

Technican: Also here is a link that should be helpful if you don't have a repair manual for your blazer. Highlight, Edit, Copy, and Paste it into your address bar. autozone.com/servlet/UiBroker?UseCase=RG001&UserAction=beginRepairGuide Under Emission Controls you will find instructions for self diagnostics of the computer trouble codes.

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