code 42
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 862
Likes: 0
From: Lewisvlle NC
code 42
88' 35th anni. Car continues to throw code 42,which is est or ecm. I replaced the ecm, knock sensor,est,esc, ignition module and for good works,put in new coil, dist. cap and rotor.Did not replace the prom. Car continued to throw a code 42, but ran ok. A little sluggish and poor fuel mileage. Drove it for about 300 mi. this way and then it quit.Had to have it towed. Popping and banging upon starting and would not take any throttle without stalling. I'm thinking I have some sort of wiring problem to the ecm,but don't know for sure. any ideas ? Thanks
Team Owner
Joined: Sep 2001
Posts: 62,067
Likes: 1,723
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Did you run these diagnostics? From an 86 but should be the same. My 88's Helm is not available at the moment.
http://members.shaw.ca/corvette86/Code%2042.pdf
I have had replacement ECMs be junk as well, where did you get the replacement?
http://members.shaw.ca/corvette86/Code%2042.pdf
I have had replacement ECMs be junk as well, where did you get the replacement?
Racer
Joined: Nov 2008
Posts: 321
Likes: 2
From: Auburndale FL
Sorry, I don't remember where I saw it. But i did find somewhere an bad spark plug wire could cause this.
If I remember correctly is has to do with EMI and a plug wire bleeding thru to ground or arcing in some fashion.
Thought I would offer this up incase you haven't check your plug wires.
Best of luck...
If I remember correctly is has to do with EMI and a plug wire bleeding thru to ground or arcing in some fashion.
Thought I would offer this up incase you haven't check your plug wires.
Best of luck...
