1987 Chevy Blazer Starting

WBETHEAJR

MEMBER
1987 CHEVROLET BLAZER
V8
4WD
AUTOMATIC
10,500 MILES

I came home one day and parked my blazer in the driveway. Several hours later I went back out and it would not start. After further investigation I found that it was not getting any fire to the plugs or fuel to the injectors. I have replaced the plugs, wires, distributor cap, rotary button, ignition module, coil, and the fuel pump relay, still nothing. I have checked the ECM for trouble codes and it does not show any. I have checked all the grounds. Whats left? What would cause me to lose the ignition and fuel at the same time?

7 Replies

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Did you jump the relay to make sure the fuel pump works?

Is there a relay or fuse for the Ignition system?

When you scanned for codes, did it go through the scan proceedure or did it say Unable to Read or something like that.

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Sunday, May 18th, 2008 AT 12:01 PM

WBETHEAJR

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3 POSTS

I have checked all fuses and the fuel pump is working, you can hear it come on when you turn on the switch and lay near the fuel tank. I used the jumper wire like the Haynes manual sayes and it just flashed the code 12 and no other codes. 1 flash pause and 2 flashes.

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Sunday, May 18th, 2008 AT 3:20 PM

OBXAUTOMEDIC

MECHANIC
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OK, are you or have you been able to check the fuel pressure?

have you change the following part ESC Module....

Electronic Spark Control Module.....

it is usually mounted on the fire wall

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Sunday, May 18th, 2008 AT 4:40 PM

WBETHEAJR

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3 POSTS

Fuel pressure is fine. Does the ESC control the fuel injectors?

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Sunday, May 18th, 2008 AT 9:38 PM

OBXAUTOMEDIC

MECHANIC
3,711 POSTS

Ok, if your checking the fuel pressure at the fuel rail then I believe you have fuel just no spark to light it.

The electronic spark control ESC, is designed to RETARD the timing when the engine senses a spark nock or pinging.

One of my Customers had the same problem. His was a 90 model or so S10 Blazer. I check everything with fuel system and Ignition system. Tested everything except the ESC. I just happen to have an used one didn't know if it was good or not. Put it on and the vehicle fired right up.