MERGED-(Fresh opti pull pics) & (Ignition stutter-Code crackers needed)
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Yates - synthetic oil might smell like plastic when cookin' - some plastics are derived from petroleum. Do you use synthetic?
You could have an unsecured harness cookin' too. Get a utility glove on, and after the motor has been fully warmed up, wipe the glove real hard at the low back corner of the V/C, and see if you pull out a plumb on yer thumb [OIL
]
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
http://forums.corvetteforum.com/show...7&postcount=38
My 6 plug was clean. This is 8 plug. ???
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Be ready to turn on the heat, since you got the fan fuse out. You'll get H77 and H78 for fan circuit fault primary and secondary - Not a problem. Watch the heat...
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
I'm tryin' to see a relationship between the fan comin' on and the ICC fault gettin' tripped H42 (ground) for you, and H41 (open) for me.
I did the test once. Fan fuse out, and NO H41, even tho' the temp got to 232 on mine.
This is the most concrete lead I got yet - means it is an electrical problem, NOT a heat problem...
You're goin' on a drive here, and usin' headlights. That bothers me, cause I'm leanin' towards an amp draw causin' this ICC fault.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Weird? This is killin' me. I been on this problem since Father's day. I finally got a concrete clue, and somebody else too with the same problem, and he's tryin' to detonate his motor before I get confirmation.
Thread Starter
Instructor
Joined: Jun 2004
Posts: 174
Likes: 0
From: OH/FL
11:18pm
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help!
Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help!
Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...
Last edited by zeitgeist57; Jul 17, 2008 at 11:27 PM.
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
11:18pm
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help! Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help!
Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
11:18pm
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help! Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...
Welp...I went tearin' off with the heater running at 247deg.
OAT (outside air temp) was 73 degrees...it got back down to 225-230 in a hurry...turned off heater.
Poked around my neighborhood in the moonlight. Drove around the golf course. Goosed the throttle a bit...no hard driving, just a couple of jackrabbit sprints from 25-40mph and then coast back down in gear...don't want to wake the neighbors...or COPS!
NO CODES!!!! NO POPPING!!! (Well, a little at one point when I got above 4000rpms...) but still NO CODES!!!!!!
EDIT:...still H77, H78, but NOOOOOOOO H41, H42!!!!!!
Riddle me this, Schrade...wtf to do now???
I sincerely appreciate your help!
Just by pulling ONE 5a FUSE, I've managed (in a limited test run) to eliminate the H41, H42 codes and bring the engine back to fighting health. I may keep that fuse out for tomorrows highway commute to see what happens...I'll pull over if the temp rises above 235-240 and put the fuse back in...So it worked for me, and yours too. Your turn to come up with somethin' now...
I'm thinkin' so hard on this all both brain cells need butter cause they're toast.Still thinkin'...
Thread Starter
Instructor
Joined: Jun 2004
Posts: 174
Likes: 0
From: OH/FL
Minor setback...engine was running, and I put the 5a *29* fuse back in. I could hear the engine momentarily take a load, like the fan turning on, and drove off with temp around 220.
As soon as I gave it gas, POP POP POP in upper RPMs, back off...CEL light comes on...
H42.
Pull over, reset codes, PULL FUSE for *29*. Drive to intersection, let engine creep up to 210, 212, 215...bump...engine lumps in idle, CEL comes on.
Drive away from intersection...BUMP-BAH-BAH-BUMP BUMP BUMP BAH BUMP all the way home.
H41, H42, plus H77 and H78 for good measure since I pulled the fuse.
Something's fishy, and methinks it's the PCM...I kno NOTHING tho...
Schrade...I'll look for your posts, but I'm going to shower and get ready for bed. 11:57pm...I'll check one more time in a half-hour. If no response, cool...but I'm going to bed.
As soon as I gave it gas, POP POP POP in upper RPMs, back off...CEL light comes on...
H42.Pull over, reset codes, PULL FUSE for *29*. Drive to intersection, let engine creep up to 210, 212, 215...bump...engine lumps in idle, CEL comes on.
Drive away from intersection...BUMP-BAH-BAH-BUMP BUMP BUMP BAH BUMP all the way home.
H41, H42, plus H77 and H78 for good measure since I pulled the fuse.
Something's fishy, and methinks it's the PCM...I kno NOTHING tho...
Schrade...I'll look for your posts, but I'm going to shower and get ready for bed. 11:57pm...I'll check one more time in a half-hour. If no response, cool...but I'm going to bed.
Safety Car
Joined: Oct 2007
Posts: 3,816
Likes: 0
From: :45 minutes from everywhere / E-I-E-I-O
Minor setback...engine was running, and I put the 5a *29* fuse back in. I could hear the engine momentarily take a load, like the fan turning on, and drove off with temp around 220.
As soon as I gave it gas, POP POP POP in upper RPMs, back off...CEL light comes on... H42.
Pull over, reset codes, PULL FUSE for *29*. Drive to intersection, let engine creep up to 210, 212, 215...bump...engine lumps in idle, CEL comes on.
Drive away from intersection...BUMP-BAH-BAH-BUMP BUMP BUMP BAH BUMP all the way home.
H41, H42, plus H77 and H78 for good measure since I pulled the fuse.
Something's fishy, and methinks it's the PCM...I kno NOTHING tho...
Schrade...I'll look for your posts, but I'm going to shower and get ready for bed. 11:57pm...I'll check one more time in a half-hour. If no response, cool...but I'm going to bed.
As soon as I gave it gas, POP POP POP in upper RPMs, back off...CEL light comes on...
H42.Pull over, reset codes, PULL FUSE for *29*. Drive to intersection, let engine creep up to 210, 212, 215...bump...engine lumps in idle, CEL comes on.
Drive away from intersection...BUMP-BAH-BAH-BUMP BUMP BUMP BAH BUMP all the way home.
H41, H42, plus H77 and H78 for good measure since I pulled the fuse.
Something's fishy, and methinks it's the PCM...I kno NOTHING tho...
Schrade...I'll look for your posts, but I'm going to shower and get ready for bed. 11:57pm...I'll check one more time in a half-hour. If no response, cool...but I'm going to bed.
All I'm seein' is the amp draw of the fan kickin' in that causes the ICC fault. That's on the PCM (faulty), or maybe the voltage regulator internal to the alternator. But the draw is ONLY 5 AMPS!!! NOT ENOUGH TO CAUSE PROBLEMS, UNLESS IT'S ON THE SAME CIRCUIT.
AND THE ONLY THING IN COMMON, IS THE IGNITION SWITCH CIRCUIT #210 TO FUSE PANEL.
Even then each fuse 29, and 33 have no relation until the individual fan circuits, and ICC circuits, get BACK TO THE PCM!!!
Where's jfb? Isn't he an electrical engineer or some kinda electric hack?