Code 42
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Joined: Aug 2006
Posts: 620
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From: Knoxville, TN
Car: '87 Camaro / '87 Chevy K10
Engine: 3.4L MPFI (soon) / 5.7L TBI
Transmission: 700R4 / 700R4
Axle/Gears: 3.42 / 3.73
Code 42 & Shorted out computer (i'm a moron)
Yes, I've searched...most threads on this topic are never finished, it seems, or give advice that ranges from one end of the car to the other with nothing concrete.
Noticed early last evening that my idle began to drop just slightly below normal, but bounced back up with no trouble. Later that night, hit a small incline doing about 2500rpms on the freeway and the tach starts jumping all over the place...The car itself didn't change, just the tach(at 2500, it was bouncing between 3000 and 4500). I continued for a few more miles and decide to pull off and take surface streets back to the house, taking it easy. Rolled off the freeway and when it hit about 1500 rpms, the SES light came on. Pulled into a gas station and checked the codes, got code 42. Drove it home real easy, no troubles. Popped the hood, cleared the codes, and it threw it again. This time, the car was sounding way off. Got in this morning to head to work, and it was really rough riding. It especially didn't like coming from a dead stop, and there's no "get-up-and-go" in it. Getting up into the higher speeds(around 55mph, 2500-3000rpm), it had a lot of hesitation, like it was trying to decide how fast to go. The idle is also dropping below normal on a regular basis, but hasn't stalled yet.
As far as troubleshooting, I've checked nothing. The Code 42 Flowchart talks about using an ohmeter next, but I lack one. Any alternatives? What do you guys suggest?
Noticed early last evening that my idle began to drop just slightly below normal, but bounced back up with no trouble. Later that night, hit a small incline doing about 2500rpms on the freeway and the tach starts jumping all over the place...The car itself didn't change, just the tach(at 2500, it was bouncing between 3000 and 4500). I continued for a few more miles and decide to pull off and take surface streets back to the house, taking it easy. Rolled off the freeway and when it hit about 1500 rpms, the SES light came on. Pulled into a gas station and checked the codes, got code 42. Drove it home real easy, no troubles. Popped the hood, cleared the codes, and it threw it again. This time, the car was sounding way off. Got in this morning to head to work, and it was really rough riding. It especially didn't like coming from a dead stop, and there's no "get-up-and-go" in it. Getting up into the higher speeds(around 55mph, 2500-3000rpm), it had a lot of hesitation, like it was trying to decide how fast to go. The idle is also dropping below normal on a regular basis, but hasn't stalled yet.
As far as troubleshooting, I've checked nothing. The Code 42 Flowchart talks about using an ohmeter next, but I lack one. Any alternatives? What do you guys suggest?
Last edited by forkvoid; Oct 26, 2006 at 12:43 AM.
Thread Starter
Senior Member
iTrader: (1)
Joined: Aug 2006
Posts: 620
Likes: 0
From: Knoxville, TN
Car: '87 Camaro / '87 Chevy K10
Engine: 3.4L MPFI (soon) / 5.7L TBI
Transmission: 700R4 / 700R4
Axle/Gears: 3.42 / 3.73
I can't believe there's only six views on this thread, how odd.
More updates: Talked to a mechanic at AutoZone(old bearded guy, had an ASE logo on his shirt, so maybe he knows what he's talking about?)... I accidentally left the paperclip in the diag port, which he said shorted out the computer. He told me to disconnect the battery for five minutes, then turn the key to on(not run), then off and repeat twice more. Wait five minutes, then start the car. If it still won't throw a code and runs like crap, I shorted the computer(which is true). How best to diagnose this, to be absolutely sure? I don't like spending $85 on something that won't fix the issue.
More updates: Talked to a mechanic at AutoZone(old bearded guy, had an ASE logo on his shirt, so maybe he knows what he's talking about?)... I accidentally left the paperclip in the diag port, which he said shorted out the computer. He told me to disconnect the battery for five minutes, then turn the key to on(not run), then off and repeat twice more. Wait five minutes, then start the car. If it still won't throw a code and runs like crap, I shorted the computer(which is true). How best to diagnose this, to be absolutely sure? I don't like spending $85 on something that won't fix the issue.
Thread Starter
Senior Member
iTrader: (1)
Joined: Aug 2006
Posts: 620
Likes: 0
From: Knoxville, TN
Car: '87 Camaro / '87 Chevy K10
Engine: 3.4L MPFI (soon) / 5.7L TBI
Transmission: 700R4 / 700R4
Axle/Gears: 3.42 / 3.73
This post is only to complete the thread, so someone searching finds something useful.
Ended up taking the car in to a shop this morning...the pigtail connecting to the ignition module had broken off, causing 42 to happen. The missing was somehow caused by the #1 fuel injector, whether it's just dirty, clogged or needs to be replaced.
Ended up taking the car in to a shop this morning...the pigtail connecting to the ignition module had broken off, causing 42 to happen. The missing was somehow caused by the #1 fuel injector, whether it's just dirty, clogged or needs to be replaced.
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