Blazer with a mind of its own!
#1
11-27-2012, 12:08 PM
Blazer with a mind of its own!
Our 1992 Chevy Blazer with a 4.3 V6 W vin code and spider fuel injection, has a problem: It runs like a brand new one, then suddenly it sounds like a "thump" noise and we loose all power, still runs and idles just without full power. We can floor the gas and we will still only be doing 15 miles per hour or so. Sometimes we can pull off to the side of the road and restart the truck and it will straighten up for a little while. We have pulled codes on it and its saying #42 and #43 , something about the fuel cutout switch but we have NO clue where that is either.
#2
12-01-2012, 01:13 AM
For GM vehicles made before 1995 that has a distributor type ignition and has code 42-EST circuit failure and has the following symptoms:
Stalling at stop signs
No start but if you wait up to 2 hours, it will start again
TESTS for GM obd1 with code 42:
1.) Please confirm this gm code first by resetting the code and see if the code will show up again a second time. You reset obd1 codes by disconnecting the negative battery terminal for 1 minute and reconnect. If the code shows up again, it means this code is really a hard code that must be fixed. During no start, confirm the presence of ignition problem by checking the presence of spark using an especial tool ST125(cost under $5) and available in any local parts store.
2.)Make sure there is 12 volts supply going to your distributor harness wire when you turn the key on engine off (KOEO).
FIX for GM obd1 with code 42:
Remove the distributor assembly and replace the following:
Pick up coil
Ignition module
Once the above parts are replaced, reset the code and go for a quick road test to confirm. If your engine does not have a distributor, replace the crank sensor instead of the pick up coil. But check also for input voltage to the crank sensor harness wire. In some cases, the crank sensor magnet probe could be cracked and make sure to check them by removing the sensor for close visual inspection.
43 is a knock sensor error
I would start with the ignition module in the distributor, and reset the computer by unhooking the battery (which you will do to change the ICM) and go from there. Pull the knock sensor out while you are back by the distributor and have a look at it closely.
Stalling at stop signs
No start but if you wait up to 2 hours, it will start again
TESTS for GM obd1 with code 42:
1.) Please confirm this gm code first by resetting the code and see if the code will show up again a second time. You reset obd1 codes by disconnecting the negative battery terminal for 1 minute and reconnect. If the code shows up again, it means this code is really a hard code that must be fixed. During no start, confirm the presence of ignition problem by checking the presence of spark using an especial tool ST125(cost under $5) and available in any local parts store.
2.)Make sure there is 12 volts supply going to your distributor harness wire when you turn the key on engine off (KOEO).
FIX for GM obd1 with code 42:
Remove the distributor assembly and replace the following:
Pick up coil
Ignition module
Once the above parts are replaced, reset the code and go for a quick road test to confirm. If your engine does not have a distributor, replace the crank sensor instead of the pick up coil. But check also for input voltage to the crank sensor harness wire. In some cases, the crank sensor magnet probe could be cracked and make sure to check them by removing the sensor for close visual inspection.
43 is a knock sensor error
I would start with the ignition module in the distributor, and reset the computer by unhooking the battery (which you will do to change the ICM) and go from there. Pull the knock sensor out while you are back by the distributor and have a look at it closely.
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