Question about 1983 Buick Riviera
On this old boat you can clear the codes by disconnecting the battery for about 10 seconds.Always disconnect the ground cable.Code 42 is for the electronic spark timing.The ignition module can cause this code.It is in the distributor.Also when checking the timing you have to put it in bypass mode.To do this you have to jump terminals A and B on the diagnostic connector under the drivers side dash.The timing should be at 20 degrees at 11000 rpm in park.Hope this helps.Good luck.
Posted on Feb 03, 2010
My book says trouble code 42 is (EST circuit fault) EST stands for electronic spark timing. But it sounds like you already know that. When you set the timing you are jumpering between A & B terminal on the ALDL correct?
Posted on Feb 03, 2010
With a code 42 most likely when the car was at the correct timing it prabably ran pretty sluggish. What this code is about is you engine does not change timing which is needed in order to keep up with the compression as the RPM's increase.
Pinch off the line that is buzzing with pliers is you can. This may be a vacuum leak in the valve. If the engine smooths out then this valve definitely is a problem.
A far as the code 42 the diagnostic flow chart basically says to do a bunch of testing and depending on the results you either have a poor connection on the distributor or the ECM or the HEI module.
If all the connections were deemed good then only the HEI module or the ECM are recommended as being the problem.
Your car may have other issue but first thing is to get the idle and the timing working like there suppose to.
Also these older cars really like a accurate coolant sensor. As they fail car generally become harder to start because you need more fuel so they falter until the engine is hot enough for less fuel.
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
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