DTC Err 42 (Problem Found)

The Devils Own Chariot

The Devils Own Chariot

Active member
I drove into work today and it stumbles bad at idle. when you push the gas it spits a bit and then finally goes and then smooths out.

I would have dont a search on this but the searching feature on the forum is down. This is exatly what datamaster says: MALF 42: EST Monitor Error

What does that mean?
 
Last edited:
4C FED

4C FED

Absolutum Dominium
Re: DTC Err 42

Re: DTC Err 42

Rookie said:
I drove into work today and it stumbles bad at idle. when you push the gas it spits a bit and then finally goes and then smooths out.

I would have dont a search on this but the searching feature on the forum is down. This is exatly what datamaster says: MALF 42: EST Monitor Error

What does that mean?
Click to expand...

Search works.
Select SEARCH then ADVANCED SEARCH & it will work normally.
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: DTC Err 42

Re: DTC Err 42

I found this on sportmachines:

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

What the heck is a HEI module?
 
4C FED

4C FED

Absolutum Dominium
Re: DTC Err 42

Re: DTC Err 42

The thing inside the distributor that the 2 external cables hook up too.
 
bezerk

bezerk

New member
Re: DTC Err 42

Re: DTC Err 42

what does your knock meter tells you? could be a broken knock sensor also
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: DTC Err 42

Re: DTC Err 42

bezerk said:
what does your knock meter tells you? could be a broken knock sensor also
Click to expand...

DatamasterSnap.jpg
 
bezerk

bezerk

New member
Re: DTC Err 42

Re: DTC Err 42

holy boost ! but you don't have a code in the save screen you sent. did you?
are you running 25psi on stock injectors? you must have a nice stock engine with only 1.5 KR amazing!
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: DTC Err 42

Re: DTC Err 42

bezerk said:
holy boost ! but you don't have a code in the save screen you sent. did you?
are you running 25psi on stock injectors? you must have a nice stock engine with only 1.5 KR amazing!
Click to expand...

This run if right before I got the code. Yes I have stock injectors. Why is that so amazing that I can run that much boost? Im runing 100% methanol with it. I have been trying to tell you guys that Im able to run that much. I have been able to run any boost level that I want so far as long as I give it enough meth. There is still something thats holding me back bottom end. Im not really sure if its my tune or what. I really think its capable of 12.0
 
P

pinellas50

New Guy
Re: DTC Err 42

Re: DTC Err 42

Code 42 is the EST circuit. The one that allows the computer to control the timing.

Did you set your timing recently? This code will show up anytime you disconnect the tan wire like when you set timing. It won't clear even if you rehook the wire. You have to disconnect the battery to reset the computer/codes.

The other reason you can get this code is a bad ignition module. I remember that from reading on this when I had this code. There were other things too but I don't remember what they were.

Put "EST" into the search and you should find more.
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: DTC Err 42

Re: DTC Err 42

I was going to try this first. I have a feeling that its not it. It does it under WOT sometimes. I dont know how much this module has to do with WOT.
DSCF1365.jpg
 
WyoSyclone

WyoSyclone

Active member
Re: DTC Err 42

Re: DTC Err 42

bezerk said:
holy boost ! but you don't have a code in the save screen you sent. did you?
are you running 25psi on stock injectors? you must have a nice stock engine with only 1.5 KR amazing!
Click to expand...

Holy boost is right... especially with that KR reading! I had better get Julio's kit installed on my Sy pronto!

One thing that is a little out of whack is your voltage... 12.3 is way low... should be 13.4 at least. I'm not sure if this would throw the code, or not.... regardless it should be fixed. Easiest way I found was to relay-isolate the injectors from the ECM - I did this at the engine side of the firewall right at the ignition wire that feeds the injectors. The battery distribution block is right there so it makes is real easy. I had the same problem, did this mod, and my voltage now stays steady at 13.4 no matter what running condition... I'll probably build a relay isolation kit and do a GP on it as soon as I get my wife and I completely moved.

Looks like your truck is running strong - much stronger than mine :( what was the MPH at the end of the run that shows 96mph in third??
 
The Devils Own Chariot

The Devils Own Chariot

Active member
Re: DTC Err 42

Re: DTC Err 42

Im using the Alkycontrol Kit aka Razor kit.
When it throws the code it was at 13.5 volts so Im not sure if thats it or not.
I just shift into 4th around 95mph. I think thats what I have been doing. Not so worried about speed but I watch the RPMs instead. When I hit 4th thats when it really starts to soar. The engine sounds different also. It really starts to beller.
 
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