code 42
#1
Teching In
Thread Starter
Join Date: Feb 2006
Location: stayton,oregon
Posts: 43
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
i had a map senser that came unplugged and got a check engine light so i took a friends snapon scaner and cleared it. After that the light come back for code 42. Now the scaner said that it was opti-spark circuit break or somthing like that. my question is, what is code 42 really and how do i fix or test for it? Is it possible to test?I cleaned the computer after i got code 42 and it hasnt came on agin.But the car misses really bad at highway speed and under wide open throttle? The opti is like 6 mouths old, and i use delteq ing. system. Im thinking its my opti spark
. but im going to check plugs, wires and connectors to niight.
![EEK !!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_eek2.gif)
#3
TECH Veteran
iTrader: (53)
Join Date: Feb 2004
Location: Monticello, Kentucky
Posts: 4,433
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
If the MAP worked its way loose, check and see if the opti harness may have came loose too. I was getting a lo res failure (DTC 43 I think) and my miss wasn't even that bad. I too have a Delteq and if the MAP worked its way off, check the coils too. I had a bad miss once and my coils weren't bolted down well enough and they were losing contact with the terminals.
#4
TECH Veteran
iTrader: (53)
Join Date: Feb 2004
Location: Monticello, Kentucky
Posts: 4,433
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by infinitebird
code 42 is ignition control circuit shorted.
That's usually the coil/icm or a bad ground/short between the pcm and coil/icm.
That's usually the coil/icm or a bad ground/short between the pcm and coil/icm.