What is this wire?
Thread Starter
Cruising
Joined: Jul 2009
Posts: 14
Likes: 0
What is this wire?
I'm hunting down code 42... while checking the ground on the side of the block, I spotted this wire hanging and touching the manifold. It's black, I assume it's a ground, but where does it reattach?
(drivers side, off group wires heading to the front of the car)
thanks
(drivers side, off group wires heading to the front of the car)
thanks
Le Mans Master
Joined: Jul 2004
Posts: 6,228
Likes: 698
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
I'm hunting down code 42... while checking the ground on the side of the block, I spotted this wire hanging and touching the manifold. It's black, I assume it's a ground, but where does it reattach?
(drivers side, off group wires heading to the front of the car)
thanks
(drivers side, off group wires heading to the front of the car)
thanks
Thread Starter
Cruising
Joined: Jul 2009
Posts: 14
Likes: 0
89 Coupe. Guess knowing what the car is would help.
I tried taking the ICM to get it tested, which resulted in the plastic clips in the distributor falling apart. The ICM tested fine. Well, doing some shopping, I found a reman distributor with both plugs, cap, rotor, and a new ICM for 168.00 before a 40$ core. I followed these directions to get it replaced:
http://forums.corvetteforum.com/c4-t...make-sure.html
The car fires right up when I unplug the tan wire but misses and acts like it's out of time when I plug it back in.
I have a FM, and this is the page I'm looking at:
http://members.shaw.ca/corvette86/Code%2042.pdf
I've not exactly jumped into checking my connection and OHM's yet. But I have a feeling I'm going to have to. This has been an on going pain in my *** for the last 4 months. I started with a code 33, MAF, replaced it and it's replys, worked for about 2 days - no check engine lights... after some more checks, more checks, had some other codes, I've since replaced the ECM, and TPS.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You will get a code 42 every time you unplug the EST connector to adjust/check the base timing. Reset the ECM to get rid of it. If it comes back, then you need to troubleshoot.
Reset the ECM by unplugging this connector for a second or so:
Reset the ECM by unplugging this connector for a second or so:
Thread Starter
Cruising
Joined: Jul 2009
Posts: 14
Likes: 0
As I was saying, I was having major missing issues unless I unpulgged the bypass. Going back to the FSM and doing some TS, it turns out that the ICM on my new distributor isn't working. I just swapped the two (from my core which I knew tested good), and the car fired right up with the bypass connected. Shut the car off, reset the ECM, and started the car back up. With in 10 seconds, the code is back.
While troubleshooting, I checked the 4 wires that go from the distriburtor to the ECM to make sure a short isn't present. I have to have had the timing right, or the car wouldn't run at all, or would run/sound like junk. Timing at this point has nothing to do with my code 42 now, Right?
The FSM says that "a mem-call not fully seated in the ecm can result in a code 42", I assume this is the PROM. This is what I'm going to check next.
