Code help needed on 94 truck. Just had a recent head gasket job done and checked codes today and have codes 13 and 42 coming up. What are those codes? Need some help here please

 

For a 3VZ-E engine:

://www.troublecodes.net/toyota/toyota-92-95-pickup-or-4runner-3-0l-or-93-94-t100-3-0l/

Did they re-connect all the sensors?

 

22re, but I’ll check to make sure. The cel light isn’t in full time. Just decided to check and see if there were any codes and there were 2

 

Read to clear the codes is to disconnect the neg cable from the battery or to pull the ecu fuse. I've never needed to do that. Maybe they are old codes.

https://www.4crawler.com/4x4/CheapTr...es/index.shtml

 

Mechanic sent a video of the timing chain very loose and said that one guide appears broken and likely the head was pulled without the timing chain left on and obviously it was damaged that way. I’m guessing the codes are related to this. I would guess the knock code is picking up on the chain slap

 

Same mechanic? Who does a "head gasket job" and leaves the timing chain like that?

So far as I can tell from the video, your chain tensioner is not doing anything and the at least the left chain damper ("guide") is gone. I don't know much about the 22re, and there are those who claim they can work on the timing chain (tensioner, dampers) without removing the head, but Toyota doesn't believe it. In your case, I'm sure you'd be better off back-tracking and re-doing the head gasket anyway.

But that has nothing to do with your codes. Code 13 "NE signal is not input to ECM for 300 msec. or more when engine speed is 1,500 rpm or more" is caused by defects in the wiring to the distributor, or perhaps the distributor. Code 42 "SPD signal is not input to the ECM for at least 8 seconds during high load driving with engine speed between 2,200 rpm and 5,000 rpm" is either wiring or the speed sensor. (Do you know if you have the electronic speed gauge?)

Neither of these codes have anything to do with knocking. Do you really have code 52? Even code 52 has nothing to do with "chain slap." Code 52 is the absence of a signal from the knock sensor.

 

The speedo hasn’t worked in a very long time and that could be part of 42.
13, I’ll have the guy fixing this to look into it

 

Even shortcutting the timing chain replacement with the head in place is a fair amount of work. There's two approaches. 1) Remove the valve cover and pull the bolt that is at the front of the head going down into the cover. then pull all the bolts in the timing chain cover and gently pry(like "gently" and "pry" can be used together in the same sentence) the cover out, trying not to damage the headgasket. The real trick is getting the cover back in and sealed. 2) Same as above, but you loosen the head bolts a bit so you can lift up the front of the head just enough to slide out the cover. Makes reassembly easier, too. Of course, now the headgasket is compromised.
Some people pull it off with success(a few). Others have chronic oil leaks(the majority). And oil leaks at the front of a 22R# end up coating your entire engine and underside with a film of oil and grit. The fact that your only saving 1-2 hours of time I just don't see the rationale. Pull the head.

Why in Hell would someone put a headgasket on with a chain like that.?