Question about 1992 Oldsmobile Bravada

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I HAVE A 1991 OLDS bravada with a 4.3 v6. Service engine light comes on and reads code 42 {electronic spark timing or cicuit failure) I have changed dist cap wires, plugs and rotor button, but still is missing and engine light comes on code 42, what do you think problem is?

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Hey, your right about code 42 being the Electronic Spark Timing. The Electric Spark Timing Bypass curcuit or EST circuit is either grounded or open. A malfunctioning HEI module can cause this code so I suggest maybe trying to replace the HEI module. Good luck!

Posted on Feb 06, 2009

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One our two problems may cause this first there may be a ing modugle problem cheaper of the two problems our it may a ecm issuse. i would try the modugle first

Posted on Dec 29, 2008

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For the Oldsmobile Bravada 4.3L V6:

Firing Order
:
1-6-5-4-3-2

Cylinders:
......(back)......
|..6..|.......|..5..|
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|..2..|.......|..1..|
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Distributor Connections:
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Let me now if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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Just went through this myself, so do the following:
Go to your local parts store and buy a Haynes Repair Manual.
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