Throwing codes... And hammers!

O

odium

1BADGMC
So far... My check engine light never comes on, but datamaster reads a stored code in the ECM every time I turn the ignition back on after clearing it. I have taken the ECM fuse out and waited 1 minute a few times to try clearing it in hopes that it is false from doing the cap/rotor, but it keeps coming back.

Code 42:
EST (Electronic Spark Timing) - This code is when the circuit is grounded or open. A malfunctioning HEI module can cause this code.

I have multiple friends that have had the ignition module go out on them and they can't even start the car. Mine purrs like a kitten at idle and drives around alright other than the bad spark retard under boost (don't worry, I still haven't pushed this truck and haven't driven it without datamaster since I found it had problems). Does anybody have any insight as to what lets me drive around with a malfunctioning HEI unit?

A new one has been ordered, btw.

Search words:
check engine light
flashing flashes 42
error codes
 
SY2932

SY2932

Administrator
First, check this wire under the carpet on the passenger side:
IMG_0569.sized.jpg

"The "tan wire with a black stripe" that everyone can't find when attempting to set their timing. Wire is under the carpet on the passenger side below the heater box. It is disconnected to set the timing, then reconnected. "

Chances are the wire was disconnected to set the timing and forgot about or someone accidently seperated the plug with their feet.
 
O

odium

1BADGMC
She's connected! But it still throws the code.. I used that same pic to find the wire.

Is a code 42 thrown when that wire is disconnected? Maybe the fuse isn't clearing the ECM properly?
 
O

odium

1BADGMC
Aaaaah, I bet that's it then.. I was turning ignition on and off while timing and the code must have gotten stored in there. My Chilton apparently sucks. Thanks, hopefully this will at least fix this prob.
 
SY2932

SY2932

Administrator
odiwik said:
Aaaaah, I bet that's it then.. I was turning ignition on and off while timing and the code must have gotten stored in there. My Chilton apparently sucks. Thanks, hopefully this will at least fix this prob.
Click to expand...

Correct. Setting the timing can/will set a code 42 that can only be erased by disconnecting the battery momentarily. Don't sweat it, my Haynes manual doesn't make mention of it either :-?...

However if your EST wire is connected, erasing that code from the ECM won't fix your problem. If you are getting knock under boost, the first thing I would check is to see if the IC pump is functioning. Beyond that, I would think fuel filter followed by fuel pump in that order. Have you checked what your fuel pressure is set at?
 
O

odium

1BADGMC
Just to let everybody know, you have to disconnect the ground from the battery or pull the ECM B fuse. There are two ECM fuses. Pulling ECM B clears the code from timing.
 
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