timing

joejoe1985 · 06-21-2008, 09:46 PM

well im back lol before i had random misfire codes well got that fixed with new fuel pump and filter drove the truck about week and noticed i had lower intake leak well decided to change it since wasnt very expensive but new lower and upper gaskets in torqued them down and every thing then remember was in hurry and forgot to mark original position of distibutor so i put engine on tdc (compression side) and pointed rotor towards number 1 plug wire dropped it in hooked up everything correct and now the truck wont start lol getting fuel 62psi and getting fire to distributor from ignition coil so i pulled number 1 plug and turned engine over and noticed very weak yellowish spark any one have any ideas lol i tested cam shaft sensor with key on and had 12 volts coming to sensor so tested sensor with engine spinning over and got between 1to3 volts on signal side which repair book calls for 5volts could that be the problem truck seems like its not even hitting at all

z07 · 06-22-2008, 09:58 AM

The computer uses the cam sensor to trigger fuel injector pulse. When you took the #1 plug out was it wet with unburnt gas?

You can use a noid light to verify that the injectors are getting a pulse but a mech's stethoscope will let you hear the injectors spray and it makes it easy to tell if one doesn't sound like the others.

The signal from the cam sensor should vary 1 to 5 volts but if you're using a digital meter you probably won't see 5 volts because of the slower reaction time. If you're getting 3 volts on a digital meter I'd bet the cam sensor is ok.

You're sure that it was cyl #1 TDC compression and not exhaust?

Did you remove the timing set while you had it apart?

joejoe1985 · 06-22-2008, 10:03 AM

no compression side is where when u put ur finger over the sparkplug hole and wait till ur feel air pressure trying to blow ur finger away from the hole correct? thats what i did and i didnt remove anything from the timing gears or anything i only removed upper and lower intake and i hear the injectors working when i turn key on and off

z07 · 06-22-2008, 10:06 AM

You did it right, Joe. Did you use a drinking straw or something to make sure it was all the way up to the top?

joejoe1985 · 06-22-2008, 11:06 AM

well i went ahead and lined the harmonic balancer with the timing mark on the timing plate so i figure that should be all the way up

joejoe1985 · 06-22-2008, 02:53 PM

well i moved the distributor few more teeth and it started right up and ran for like 3 seconds and shut off now it wont do anything lol

CharlyG · 06-22-2008, 04:03 PM

We all know what sol normally means. In this case, may I suggest we change it to Swear out loud, as the first noise that came out of his mouth, I'm willing to bet, was NOT HA! lol

Sorry, couldn't resist, it's 105 here in LA, gotta do something.

joejoe1985 · 06-22-2008, 10:53 PM

well got er running my fuel gauge said i had 1/4 tank and the guage was lying lol added 2 gallons of fuel and it fired right up so guess thats a good thing

06-22-2008, 04:03 PM	#7
CharlyG Full Member Join Date: Jun 2008 Location: Los Angeles (West Hills) Posts: 46	We all know what sol normally means. In this case, may I suggest we change it to Swear out loud, as the first noise that came out of his mouth, I'm willing to bet, was NOT HA! lol Sorry, couldn't resist, it's 105 here in LA, gotta do something. __________________ '98 Chevy 2500HD ECLB, 5.7L, 4L80E, 3.73

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06-21-2008, 09:46 PM	#1
joejoe1985 Full Member Join Date: May 2008 Posts: 15	timing well im back lol before i had random misfire codes well got that fixed with new fuel pump and filter drove the truck about week and noticed i had lower intake leak well decided to change it since wasnt very expensive but new lower and upper gaskets in torqued them down and every thing then remember was in hurry and forgot to mark original position of distibutor so i put engine on tdc (compression side) and pointed rotor towards number 1 plug wire dropped it in hooked up everything correct and now the truck wont start lol getting fuel 62psi and getting fire to distributor from ignition coil so i pulled number 1 plug and turned engine over and noticed very weak yellowish spark any one have any ideas lol i tested cam shaft sensor with key on and had 12 volts coming to sensor so tested sensor with engine spinning over and got between 1to3 volts on signal side which repair book calls for 5volts could that be the problem truck seems like its not even hitting at all

06-22-2008, 09:58 AM	#2
z07 Senior Member Join Date: Feb 2008 Posts: 176	The computer uses the cam sensor to trigger fuel injector pulse. When you took the #1 plug out was it wet with unburnt gas? You can use a noid light to verify that the injectors are getting a pulse but a mech's stethoscope will let you hear the injectors spray and it makes it easy to tell if one doesn't sound like the others. The signal from the cam sensor should vary 1 to 5 volts but if you're using a digital meter you probably won't see 5 volts because of the slower reaction time. If you're getting 3 volts on a digital meter I'd bet the cam sensor is ok. You're sure that it was cyl #1 TDC compression and not exhaust? Did you remove the timing set while you had it apart?

06-22-2008, 10:03 AM	#3
joejoe1985 Full Member Join Date: May 2008 Posts: 15	no compression side is where when u put ur finger over the sparkplug hole and wait till ur feel air pressure trying to blow ur finger away from the hole correct? thats what i did and i didnt remove anything from the timing gears or anything i only removed upper and lower intake and i hear the injectors working when i turn key on and off

06-22-2008, 10:06 AM	#4
z07 Senior Member Join Date: Feb 2008 Posts: 176	You did it right, Joe. Did you use a drinking straw or something to make sure it was all the way up to the top?

06-22-2008, 11:06 AM	#5
joejoe1985 Full Member Join Date: May 2008 Posts: 15	well i went ahead and lined the harmonic balancer with the timing mark on the timing plate so i figure that should be all the way up

06-22-2008, 02:53 PM	#6
joejoe1985 Full Member Join Date: May 2008 Posts: 15	well i moved the distributor few more teeth and it started right up and ran for like 3 seconds and shut off now it wont do anything lol

06-22-2008, 10:53 PM	#8
joejoe1985 Full Member Join Date: May 2008 Posts: 15	well got er running my fuel gauge said i had 1/4 tank and the guage was lying lol added 2 gallons of fuel and it fired right up so guess thats a good thing