96 mustang. new head and runs like s**t

mustang gt 96 · July 19th, 2011, 07:42 PM

ok guys this is what i have. 96 gt 4.6 over heating. took passenger side head off had it pressure checked and it was cracked on #3 cylinder. got new "used" head and had it checked and decked everything look great no leaks or anything. put the head on got it all buttoned up and runs like s**t. replaced all plugs, wires, flushed out injectors and rails still no change. checked the compression 140-150psi across the board. which should be enough for the deep dished forged pistons that are in it. im running out of ideas any help would be appreciated.

mustang gt 96 · July 19th, 2011, 07:43 PM

also re timed it twice just to make sure it was in time.

JasinEdward · July 19th, 2011, 09:11 PM

are you using the cam from the damaged head?

mustang gt 96 · July 19th, 2011, 10:23 PM

yes. using the cam lifters and rockers from the old head. but the car ran fine before just pressurized the coolant system.

p4ndiamond · July 19th, 2011, 11:18 PM

"deep dished forged pistons"

Is it tuned for that ? it might need different timing. there is a chance that the timing is off on it, pull the front cover and check it again.

Before you do that unhook the battery reset the ECU and check that. Might need a tune . Also check the cam shaft position sensor wife and crank trigger wheel...just to name a few. Also make sure your front O2 are plugged in .

G.T. Rags · July 19th, 2011, 11:25 PM

and cels?

mustang gt 96 · July 20th, 2011, 12:52 AM

No cel's. I've put this motor in time a couple times before the same way and its ran fine every time. The thing is it will fire right up no hesitations. But as soon as it idles down it just starts missin. Also has new coil packs. Im thinkin injector but not sure?

mustang gt 96 · July 20th, 2011, 12:54 AM

And it has the pistons because of the svo s/c kit on it.

p4ndiamond · July 20th, 2011, 12:59 AM

sounds like vaccume then . check IAC...check vaccume lines and intake sealing. also might be something like the TPS.... sounds sensor related or tune.

sharkbait · July 20th, 2011, 01:30 AM

Lol did you tighten the head gasket properly? You said it ran fine before you pressurized the coolant system

mustang gt 96 · July 20th, 2011, 11:42 AM

ya it got tightened down correctly. and it ran fine with the other head on it just the crack caused the head to pressurize.

zdkel · July 20th, 2011, 07:37 PM

Originally Posted by sharkbait

Lol did you tighten the head gasket properly?

Aftermarket head studs or Ford Torque To Yield studs??

mustang gt 96 · July 20th, 2011, 09:15 PM

ford torque to yield bolts. idk what the heck is goin on with this thing. whatever you do to it doesnt change a dam thing lol

sharkbait · July 20th, 2011, 09:25 PM

Wait did you get new ones or re use them?

mustang gt 96 · July 20th, 2011, 10:08 PM

new bolts and new gasket. pulled all four plugs out of the pass side head all fouled.

July 19th, 2011, 07:42 PM	#1
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	96 mustang. new head and runs like st ok guys this is what i have. 96 gt 4.6 over heating. took passenger side head off had it pressure checked and it was cracked on #3 cylinder. got new "used" head and had it checked and decked everything look great no leaks or anything. put the head on got it all buttoned up and runs like st. replaced all plugs, wires, flushed out injectors and rails still no change. checked the compression 140-150psi across the board. which should be enough for the deep dished forged pistons that are in it. im running out of ideas any help would be appreciated.

July 19th, 2011, 11:18 PM	#5
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 14.80 No traction Join Date: May 2010 Location: New Orleans Posts: 1,216 iTrader: 0 reviews	"deep dished forged pistons" Is it tuned for that ? it might need different timing. there is a chance that the timing is off on it, pull the front cover and check it again. Before you do that unhook the battery reset the ECU and check that. Might need a tune . Also check the cam shaft position sensor wife and crank trigger wheel...just to name a few. Also make sure your front O2 are plugged in . __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

July 20th, 2011, 12:59 AM	#9
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 14.80 No traction Join Date: May 2010 Location: New Orleans Posts: 1,216 iTrader: 0 reviews	sounds like vaccume then . check IAC...check vaccume lines and intake sealing. also might be something like the TPS.... sounds sensor related or tune. __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

July 20th, 2011, 01:30 AM	#10
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	Lol did you tighten the head gasket properly? You said it ran fine before you pressurized the coolant system __________________ 410rwhp 520rwtq @ 12.9 psi

July 20th, 2011, 09:25 PM	#14
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	Wait did you get new ones or re use them? __________________ 410rwhp 520rwtq @ 12.9 psi

July 19th, 2011, 07:43 PM	#2
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	also re timed it twice just to make sure it was in time.

July 19th, 2011, 09:11 PM	#3
JasinEdward Regular Join Date: May 2011 Posts: 64 iTrader: 0 reviews	are you using the cam from the damaged head? __________________

July 19th, 2011, 10:23 PM	#4
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	yes. using the cam lifters and rockers from the old head. but the car ran fine before just pressurized the coolant system.

July 20th, 2011, 12:52 AM	#7
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	No cel's. I've put this motor in time a couple times before the same way and its ran fine every time. The thing is it will fire right up no hesitations. But as soon as it idles down it just starts missin. Also has new coil packs. Im thinkin injector but not sure?

July 20th, 2011, 12:54 AM	#8
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	And it has the pistons because of the svo s/c kit on it.

July 20th, 2011, 11:42 AM	#11
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	ya it got tightened down correctly. and it ran fine with the other head on it just the crack caused the head to pressurize.

July 20th, 2011, 09:15 PM	#13
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	ford torque to yield bolts. idk what the heck is goin on with this thing. whatever you do to it doesnt change a dam thing lol

July 20th, 2011, 10:08 PM	#15
mustang gt 96 Newbie 1996 Mustang GT Join Date: Jul 2011 Location: cullman, AL Posts: 30 iTrader: 0 reviews	new bolts and new gasket. pulled all four plugs out of the pass side head all fouled.

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