Trouble code 42

Tiny
JAMMER
  • MEMBER
  • 1942 CHEVROLET TRUCK
Had problems, replaced ignition control module, pickup coil, coil, also timing chain. Now when I have the EST unplugged I time the motor where it starts and runs, then I shut off the truck and plug the EST back together, and start the truck it wont start. I moved the distrubutor a little and it starts and runs fine. Thinking I was done I put everything back together, got in the truck to test drive, and it wont start, have to move the dist. To get it to start, but it wont run in that position. Where is the EST can it be bad and replaced? Or is it part of the main computer?
Monday, January 22nd, 2007 AT 9:31 PM

27 Replies

Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Hey jammer,
Some info please and I'll be able to help ya more! Year, make, model and engine size!

Chris
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 4:51 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Sorry 90 chevy silverado 5.7 milage, 195,000
also when idoling at time it surges almost causing it to die. Someone at work told me that it could be the main computer, because I checked for spark with a screwdriver and arced it to the block, that it could fry the computer. But before I do that I have to here it from someone with more knowledge.
Thanx
jeff
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 8:27 AM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Hey Jeff,
No problem! Ok. EST code will set every time you disconnect the EST bypass wire. So thats not an issue! And I wouldn't worry about the spark test thing either, otherwise every time a spark plug wire shorted, you would have to by a new ECM! From what you have described it sounds like there is a timing issue. You had to remove the Dist. To do the pick up. So I really gotta recommend a "roll the motor over by hand" timing check. Remove the cap. Roll the motor over to the crank pulley TDC mark. Check to make sure the rotor is at #1 in relation to the cap. Let me know!

Chris

p.S. I'm not trying to insult your intelligence or anything like that! I'm just a "back to basics first" kind of guy when it comes to diagnostic work! And 99% of the time its these "basics" that help us go in the direction we need to!
Was this
answer
helpful?
Yes
No
-1
Tuesday, January 23rd, 2007 AT 8:47 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok will do, was planning on that anyway, thought it might be a tooth off but was just checking for other avenues to explore also.
Thanx again
jeff
Was this
answer
helpful?
Yes
No
+1
Tuesday, January 23rd, 2007 AT 8:53 AM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Cool! Great minds think alike! :D
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 9:02 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok, it is at TDC everything is in line
rotor pointing at #1, timing mark on 0
also as before I have to turn dist. Clockwise to start and then counter clockwise to keep it running. Once running it runs fairly smooth, little hesitant once it shifts into 2nd gear but other than that its normal.
Was this
answer
helpful?
Yes
No
+3
Tuesday, January 23rd, 2007 AT 11:55 AM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
OK and its timed to spec? With a timing light?

Chris
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 12:00 PM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Well my timing light quite working yesterday, but it was in time,

well Im gonna have to continue this tomorrow if possible. Im working midnight shift and its time for bed. If its poss. Or just leave me with your thoughts on the next step or two
Was this
answer
helpful?
Yes
No
+2
Tuesday, January 23rd, 2007 AT 12:18 PM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
OK Jeff, will email ya the procedure just in case and do your best to get an operational timing light. Cya tomorrow!

Chris
Was this
answer
helpful?
Yes
No
+1
Tuesday, January 23rd, 2007 AT 12:21 PM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok thank you.
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 12:32 PM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Email address is ta4554sp@aol. Com
Was this
answer
helpful?
Yes
No
Tuesday, January 23rd, 2007 AT 8:52 PM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS


https://www.2carpros.com/forum/automotive_pictures/47722_Noname_1.jpg



Hey Jeff,
Here ya go!

Chris
Was this
answer
helpful?
Yes
No
+1
Wednesday, January 24th, 2007 AT 3:16 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Chris, on the chart am I understanding it correctly where it says to reconnect Est by-pass connector, is the truck suppose to be running when I do this? I thought that I read in some book do not plug or unplug when motor is running, it may hurt comp.
Jeff
Was this
answer
helpful?
Yes
No
Wednesday, January 24th, 2007 AT 10:47 AM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Hey Jeff,
Let the truck warm up to operating temp, shut down, unplug est bypass, start, time, shut down, plug in est bypass and you should be good to go

Chris
Was this
answer
helpful?
Yes
No
+1
Wednesday, January 24th, 2007 AT 10:53 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok will let you know what it does.
Thanks
Was this
answer
helpful?
Yes
No
+1
Wednesday, January 24th, 2007 AT 10:56 AM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok im back I unplugged the EST and timed it at 2 degrees O wouldnt keep truck running. When I plugged the EST back in the truck wouldnt start it tried to but wouldnt stay running even when working the throttle.
Was this
answer
helpful?
Yes
No
Wednesday, January 24th, 2007 AT 12:38 PM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Wow. Ok. Some more questions I guess. You had said previously that you did a ign. Module and a pickup right? When you did the pickup did you have any problems? Like with the dist. Drive gear install? Or did it pretty much fall back into place?

Any chance you may have gotten the wrong module from the parts place? When you hook up the timing light your on the left (drivers) side of the motor for #1 right? Is there anyone available to crank over the motor while you watch the timing with the light to see where its at w/ est connect and disconn? Check the connectors for the module and make sure none of the pins are bent or broken

I'm sure I'll have more Q's. Email me your Ph # and I'll be happy to help that way too. On my dime!

Chris
Was this
answer
helpful?
Yes
No
-1
Wednesday, January 24th, 2007 AT 1:06 PM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
No problems with the dist. It all fell back into place.
I believe that I got the right parts been getting my parts from same place for a while. Advance auto
parts.
I do have the timing light on #1 front drivers side

Yes I do have a helper, but wont be here for an hour or so. I will check to see what happens when I crank it over with the EST plugged in. I will also pull the ign mod. Off and check it for broken or bent pins.
What email address should I send the number to?
Thanks again for all you help!
Was this
answer
helpful?
Yes
No
+1
Wednesday, January 24th, 2007 AT 1:53 PM
Tiny
CARUNDELL
  • MECHANIC
  • 602 POSTS
Jeff
Use the email button next to my pic

Chris
Was this
answer
helpful?
Yes
No
Wednesday, January 24th, 2007 AT 2:01 PM
Tiny
JAMMER
  • MEMBER
  • 20 POSTS
Ok all pins on the ign mod. Ok
the timing mark is 2 degrees from what I can see
whatcha got next? You can call if you would like.
Was this
answer
helpful?
Yes
No
+2
Wednesday, January 24th, 2007 AT 2:29 PM

Please login or register to post a reply.

Related OBD1 Code 42 Content