4.6 SOHC timing...

97ponylover · October 11th, 2007, 10:05 AM

ok, i have a dumb question but i have to ask before i tear the front end off...

I know that when you time the 4.6 your crank gear marking should be at 6 oclock and #1 piston should be at TDC...

So here is my dumb question: Is it possible to have the crank gears at 6 oclock and #1 not be at TDC???

SWEET2KSTANG · October 11th, 2007, 10:41 AM

not if you are looking at it correctly. it is all in a fixed position. the cams will change every other revolution, but not the crank.

97ponylover · October 11th, 2007, 10:56 AM

so then as long as my crank gears are at 6 oclock then #1 should be at TDC. I ask because after putting everything back together my car will not startup and it's really presenting as a timing issue. I have fuel, spark and air. The only thing I don't remember doing is checking for TDC on #1. The motor will spin and it tries to keep going but then just kind of dies. best I can describe it.

ujslost · October 11th, 2007, 09:40 PM

It could be 180* out of time or you have it a tooth off on the gear

SWEET2KSTANG · October 11th, 2007, 11:06 PM

probably cam timing issues.

97ponylover · October 12th, 2007, 09:55 AM

How would i get it 180* off?? That did cross my mind. The motor was originally 180 off.

I was told at one point to disconnect the cam position sensor and that would put the car in a default limp mode and would at least tell me if something was screwy with the cams. I tried it with no success.

SWEET2KSTANG · October 12th, 2007, 10:11 AM

if for some reason you had the crank of the cams exactly opposite of what they were suppose to be, they ill be 180 off.

97ponylover · October 12th, 2007, 11:10 AM

yeah that didn't happen. I'm just scratching my head at this point.

97ponylover · October 12th, 2007, 12:40 PM

some quick history that might help... I guess my problem must be somewhere else maybe electrical.

I had put in a pi swapped 98 motor. the guy who assembled it put the crank trigger wheel on backwards so it busted a timing chain and valves.
the car did run with the bad valves after replacing the timing chain...it just ran like poop. I pulled the damaged head and took it to the shop. After I reassembled everything I started having this problem. the motor turns over but will not stay running. it's like it chokes.

I decided to put the old motor back in just to eliminate anything mechanical with the motor.

i know i'm getting fuel and spark. timing has to be set I followed the procedure to the 't'. Could the car not be delivering enough air? when it tries to start i have the throttle body pretty wide open. at this point the intake, computer, sensors and starter are the only things that are the same.

October 11th, 2007, 10:41 AM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 Join Date: Oct 2006 Location: N.W. AR Posts: 8,987	not if you are looking at it correctly. it is all in a fixed position. the cams will change every other revolution, but not the crank. __________________ right now, she is a jackstand warrior if the car was a horse, i would shoot it!!! project warhorse under construction

October 11th, 2007, 11:06 PM	#5
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 Join Date: Oct 2006 Location: N.W. AR Posts: 8,987	probably cam timing issues. __________________ right now, she is a jackstand warrior if the car was a horse, i would shoot it!!! project warhorse under construction

October 12th, 2007, 10:11 AM	#7
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 Join Date: Oct 2006 Location: N.W. AR Posts: 8,987	if for some reason you had the crank of the cams exactly opposite of what they were suppose to be, they ill be 180 off. __________________ right now, she is a jackstand warrior if the car was a horse, i would shoot it!!! project warhorse under construction

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October 11th, 2007, 10:05 AM	#1
97ponylover Newbie Join Date: Jun 2006 Posts: 26	4.6 SOHC timing... ok, i have a dumb question but i have to ask before i tear the front end off... I know that when you time the 4.6 your crank gear marking should be at 6 oclock and #1 piston should be at TDC... So here is my dumb question: Is it possible to have the crank gears at 6 oclock and #1 not be at TDC???

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October 11th, 2007, 10:56 AM	#3
97ponylover Newbie Join Date: Jun 2006 Posts: 26	so then as long as my crank gears are at 6 oclock then #1 should be at TDC. I ask because after putting everything back together my car will not startup and it's really presenting as a timing issue. I have fuel, spark and air. The only thing I don't remember doing is checking for TDC on #1. The motor will spin and it tries to keep going but then just kind of dies. best I can describe it.

October 11th, 2007, 09:40 PM	#4
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,865	It could be 180* out of time or you have it a tooth off on the gear

October 12th, 2007, 09:55 AM	#6
97ponylover Newbie Join Date: Jun 2006 Posts: 26	How would i get it 180* off?? That did cross my mind. The motor was originally 180 off. I was told at one point to disconnect the cam position sensor and that would put the car in a default limp mode and would at least tell me if something was screwy with the cams. I tried it with no success.

October 12th, 2007, 11:10 AM	#8
97ponylover Newbie Join Date: Jun 2006 Posts: 26	yeah that didn't happen. I'm just scratching my head at this point.

October 12th, 2007, 12:40 PM	#9
97ponylover Newbie Join Date: Jun 2006 Posts: 26	some quick history that might help... I guess my problem must be somewhere else maybe electrical. I had put in a pi swapped 98 motor. the guy who assembled it put the crank trigger wheel on backwards so it busted a timing chain and valves. the car did run with the bad valves after replacing the timing chain...it just ran like poop. I pulled the damaged head and took it to the shop. After I reassembled everything I started having this problem. the motor turns over but will not stay running. it's like it chokes. I decided to put the old motor back in just to eliminate anything mechanical with the motor. i know i'm getting fuel and spark. timing has to be set I followed the procedure to the 't'. Could the car not be delivering enough air? when it tries to start i have the throttle body pretty wide open. at this point the intake, computer, sensors and starter are the only things that are the same.

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