Help with DTC codes 31, 36, & 42 - ZR-1 Net Registry Forums

90redZR1 · 09-28-2013

Hello, I have a new to me 1990 ZR1 with low mileage. It takes a bit of cranking to start and idles fine for a while, then it start to sputter, and will shut off if I don't give it gas. I pulled codes 31, 36, & 42, and would really appreciate some advice on the best way to proceed to get this fixed. Note that the PO changed out the injectors. Thanks in advance.

Franke · 09-29-2013

I would start with the lowest code first, 31 which is the cam sensor circuit.

gbrtng · 09-30-2013

Clear the codes and see if the same ones come back - if not repeatable, you might have a flakey ECM.

Schrade · 10-02-2013

Have you got FSM yet? That and a multimeter are an absolute necessity for the car - more so than a wrench. And for your home too.

When you get it, note that with multiple DTC's, some often defer diagnostic sequence right away, to another DTC, if present (could be by the DTC number, as Franke was sayin' there)...

09-28-2013	#1
90redZR1 Join Date: Nov 2012 Location: Ontario Posts: 2	Help with DTC codes 31, 36, & 42 Hello, I have a new to me 1990 ZR1 with low mileage. It takes a bit of cranking to start and idles fine for a while, then it start to sputter, and will shut off if I don't give it gas. I pulled codes 31, 36, & 42, and would really appreciate some advice on the best way to proceed to get this fixed. Note that the PO changed out the injectors. Thanks in advance.

09-29-2013	#2
Franke Join Date: May 2013 Location: Beaver, PA Posts: 516	Re: Help with DTC codes 31, 36, & 42 I would start with the lowest code first, 31 which is the cam sensor circuit.

09-30-2013	#3
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,179	Re: Help with DTC codes 31, 36, & 42 Clear the codes and see if the same ones come back - if not repeatable, you might have a flakey ECM. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer

10-02-2013	#4
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Help with DTC codes 31, 36, & 42 Have you got FSM yet? That and a multimeter are an absolute necessity for the car - more so than a wrench. And for your home too. When you get it, note that with multiple DTC's, some often defer diagnostic sequence right away, to another DTC, if present (could be by the DTC number, as Franke was sayin' there)... __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]