Code 42 EST
 

Just pulled the plenum and replaced injectors and starter put it back together and is still idling ruff and check engine light comes on, checked codes and got a code 42 electronic spark timing. It’s a 1990 ZR1 with just under 10,000 miles on it. Any ideas would be great thanks.

Re: Code 42 EST
 

Have u checked ur connector and the ignition module? Bent pin?

Re: Code 42 EST
 

No I haven’t, is that under the plenum there are the two plugs under the plenum and two plugs at the back of that piece was hoping not to have to pull the plenum as I did not delete the throttle body cooling

Re: Code 42 EST
 

So as Dominic suggests.. there is that possibility of a bent pin, if so, it would be on the wide bolted connector and only if it was not inserted straight.

Here is the Code 42 info from FSM

Re: Code 42 EST
 

Ok great thank you I will go have a look at that plug and get a multi meter right away

Re: Code 42 EST
 

I took a photo of the pins after I got the plug off and it looks like a bent pin, will need to pull the plenum again to work on it. Anyone ever have luck reusing the plenum gaskets only been in a few days, don’t like doing that but don’t have access to new ones for a week or more. Thanks for the help and hopefully this works

Re: Code 42 EST
 

Yes, I routinely reuse Plenum gaskets if there are no visual defects.

Jim

Re: Code 42 EST
 

Same

Also be VERY careful with straightening that pin on the Ignition Module

Re: Code 42 EST
 

Thanks for the advice will try tonight I f I get time if not tomorrow, just so I know is the ignition module another part that is hard to find a replacement part for. Thanks again for the help very much appreciated

Re: Code 42 EST
 

Yes there are hard to find. Jerry is working on a replacement and I have a custom one in my car