Code 51 Understanding

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Alang

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Nov 6, 2006
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7mgte in my 85 automatic.

Does a code 51 cause any ECU engine management changes? I am guessing that it doesn’t because it signals 3 unrelated causes.

I am getting a code 51 and the TPS was OK a few months ago. AC is off. But I do have a neutral start issue occasionally (over 1yr or more) mostly on the rare occasions when it is parked uphill. I then need to jiggle it in neutral to start it. I am also trying to zero in on some bad MPG results with no other codes showing.
I currently have some agility issues and have to plan my efforts with some care.
 
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Alang

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Nov 6, 2006
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Had already read that. Good info but don't see that it answers the question.
It only goes into the issues caused by a TPS issue creating the code 51 and not what the code 51 may have triggered the ECU to do.
 
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Alang

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Nov 6, 2006
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restating the question:
Does a neutral start switch issue (causing a code 51 reading) affect the ECU's management of the engine?
 
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Alang

New Member
Nov 6, 2006
55
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Las Vegas
Q. "Does a neutral start switch issue (causing a code 51 reading) affect the ECU's management of the engine? "
A. "Without going into detail it depends on the cause but all involve idle. "

So you seem to be saying that there are code 51 readings CAUSED by neutral start switch issues that CAN "involve idle".
Would you outline/describe a neutral start switch issue that can cause a code 51 and how that issue affects the idle?
 
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