code 42
Printed From: West Coast Fieros
Category: General Fiero Chat
Forum Name: General Talk about Fieros
Forum Description: Just want to chat about fieros? here's the place to make that happen.
URL: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=2061
Printed Date: 24 November 2024 at 5:44am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: code 42
Posted By: tk_85redgt
Subject: code 42
Date Posted: 05 September 2010 at 12:36pm
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i got a code 42 changed the ignition module and had a hard time starting it unplug 1 of the conections a few time the it started went for a drive shut it off for a will.tryed to start it had a hard time again upluged it a few time then it started.know the rpm jumps around 900 to 1100rpm. i still have the 42 code after changing the module.
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Replies:
Posted By: Dawg
Date Posted: 05 September 2010 at 1:49pm
When you say jump around, how fast does the needle move? If it's very fast then your speed sensor (pickup coil) is on the edge of failing.
This could be the coil itself or you could have a weak magnet making the signal low.
Take a digital volt meter and set it to measure AC Volts. Take the cap off your distributor and unplug the pickup coil from the ICM. While cranking the motor over, measure the Voltage coming from the coil. It should be about 1 volt or more. If it's much lower than that you've got a problem.
DG
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You dream it up....I'll make it
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Posted By: tk_85redgt
Date Posted: 05 September 2010 at 6:34pm
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i put the old module and it fired up right away.i'l try the volt meter and let u know what happens.what is a icm.thanks
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Posted By: Dawg
Date Posted: 05 September 2010 at 8:01pm
You forgot to tell me about the tach needle.....
ICM= Ignition Control Module
Also, make sure all the connections are clean. Could be a bad plug somewhere that wiggles a bit and doesn't work. The plug between the pickup coil and the ICM is a bad one for that.
DG
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You dream it up....I'll make it
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Posted By: tk_85redgt
Date Posted: 05 September 2010 at 9:14pm
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its a slow movement.we move the plug wires and checked that the are all tight at the plugs and cap.the person we bot the car from said he had a tune up done.we pulled 2 plugs out to check them they seam to be new with very little us on them.we are planning to check them all.the wire look new also.we check the battery conections the look ok but not good we are going to buy new 1's 1 of them was cracked. thanks 4 your help.we'll get it right i hope.
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Posted By: Dawg
Date Posted: 05 September 2010 at 9:44pm
Don't worry man....we'll get'er going.
There's tons of experienced people here that I think have run across just about anything.
Stick with it.
DG
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You dream it up....I'll make it
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Posted By: Capt Fiero
Date Posted: 05 September 2010 at 9:44pm
As Dawg mentioned, the Pickup Coil is usually the fault for a code 42. We just chased that down with Tim's Fiero. We pulled the dist shaft, cleaned it up, replaced the pickup coil and igntion module, cleaned the hell out of everything aligned all the fingers and gapped them on the dist shaft and now everything is perfect. Well aside from the fact that the engine is getting old, low on compression and has a rough idle due to it, however that is a whole other issue.
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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.
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Posted By: tk_85redgt
Date Posted: 06 September 2010 at 8:21am
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CAPT FIERO can u call us it seam u know a lot about these cars maybe we can bring it to u to check some of these thingsmy dads name is dean at 604-585-3121.thanks
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