trouble code 42

[quote:66c14f7f9a="jammer"]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?[/quote:66c14f7f9a]

Hey jammer,
Some info please and I'll be able to help ya more! year,make,model and engine size!

Chris

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

[quote:284d46149c="jammer"]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[/quote:284d46149c]

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!

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

Cool! Great minds think alike!!!! :D

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.

[quote:bf2a9c41f8="jammer"]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.[/quote:bf2a9c41f8]

OK and its timed to spec???? With a timing light?

Chris

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

[quote:7360510c81="jammer"]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[/quote:7360510c81]

OK Jeff, will email ya the procedure just in case and do your best to get an operational timing light ......... cya tomorrow!

Chris

ok thank you.

email address is ta4554sp@aol.com

Hey Jeff, Here ya go! Chris

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

[quote:9a162eddc2="jammer"]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[/quote:9a162eddc2]

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

ok will let you know what it does.
Thanks

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.

[quote:c75f1b2e47="jammer"]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.[/quote:c75f1b2e47]

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

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!!!

Jeff
Use the email button next to my pic

Chris

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.

Hey Jeff,
Could not find any other relevant diagnostic checks for that so check the continuity of the est and those grounds and we'll call it a done deal!! Stay warm my friend!!

Chris

Chris,
I checked the EST wire and the Grounds both were ok for continuity. Went and got a PCM. The truck started roughly, timed at 0 degrees. Thats with the EST plugged in, but when i put it in reverse and put a load on it the truck has power then starts chugging and sometimes dies. It is closer but still not quite right.
The rough start is odd, it will crank normally and then it tries to drag, at times it will spin over fast.
Any more suggestion?
also took if for a ride up the street but only made two houses.
cleared codes and have a code 12
Having to retard it to get it to crank normal
and advancing to get to run. but no power to run.

Uggggg! ok will check on some things .......kinda tough though am on the road till sat. a.m. will let ya know

Chris

Ok I understand your working. If you get time to look up something fine if not no biggie, trucks not going anywhere HAHAHA. Dont work too hard. Could it possibly be a fuel regulator or it loosing pressure, just something else that someone told me to check into. But now im working day shift and have one hour before it gets dark. But in the dark and cold if fun to work in. haha

[quote:16d0bbfe39="jammer"]Chris,
I checked the EST wire and the Grounds both were ok for continuity. Went and got a PCM. The truck started roughly, timed at 0 degrees. Thats with the EST plugged in, but when i put it in reverse and put a load on it the truck has power then starts chugging and sometimes dies. It is closer but still not quite right.
The rough start is odd, it will crank normally and then it tries to drag, at times it will spin over fast.
Any more suggestion?
also took if for a ride up the street but only made two houses.
cleared codes and have a code 12
Having to retard it to get it to crank normal
and advancing to get to run. but no power to run.[/quote:16d0bbfe39]

Hey Jeff,
Not sure if I understood your last post. Its timed @ 0 degrees w/ the EST plugged in? If so its not timed correctly. It should be @ 0 degrees w/ the EST unplugged and then plug it back in. (after you shut it down of course!) Home all weekend, let me know!

Chris

Hi chris.
Sorry I havent been able to get back to ya earlier. Wonderful time of the year here. Colder than a witches tit here, hasnt been over 20 degrees here and winds of 15-20 mph. Then the pipes froze at my inlaws and had to go out of town to fix there problem. I also bought a new truck to get back and forth to work in well a 04 silverado. But will start working on the 90 soon as the weather permits. Hope your staying warm up there.
I will recheck timing and get it all straightened out by the next time I speak with ya. Take care and thanx for all your help.

Hey Jeff,
Thanks for the update! Been below 0 here too! Let me know when you are ready! Ya got my #

Chris