Startup Trouble After Rebuild - 2003-04 Mach 1 Registry Owners Club

MACH_Daddy_#1 · 12-01-2008, 11:37 PM

I just rebuilt my motor after seizing a cam, got it back in the car, everything ready to go...but I'm having trouble getting it to start and run smoothly. No major upgrades were done, just forged internals. It cranks over fine, nothing wrong mechanically or timing wise because it did start a couple of times, ran fine for about a minute then died, almost like its not getting fuel pressure or to much fuel & not enough air...I just dont know. Have fuel pressure when I turn the ignition on & as far as I can tell when I'm cranking it over too. Have spark, because it did start & run on all cylinders for a minute. It's almost like its not getting enough fuel after it starts because it runs a little rough and I had to keep it at full throttle to keep it idling at 1k, or it's not getting enough air after startup, I just don't know. I think it may be: bad or clogged injectors, bad connection to the injectors(i.e. residue left on connectors after spraying intake with the solvent gun before installing), MAF, or some other bad sensor or something somewhere. If anyone has had similar problems or has any insight I would greatly appreciate any information or tips you have, I am at a loss...It does start & seems like it wants to run I just dont really know where to go from here...

ponygt65 · 12-02-2008, 11:50 AM

Bad Cam timing.
New Tune needed.
Bad Fuel.
Too much/little Fuel/mixture.
Fuel sensor.
Vacuum leak.

Could be a few things or combo there of.

CompOrange · 12-02-2008, 11:55 AM

I'm gonna say that your cam timing is off, MAF not hooked up properly, or you've got a really bad vacuum leak. You need to see what your fuel pressure is for sure. Should be a mandatory gauge reading in any performance car.

CompOrange · 12-02-2008, 11:57 AM

Quote:

Originally Posted by MACH_Daddy_#1

It's almost like its not getting enough fuel after it starts because it runs a little rough and I had to keep it at full throttle to keep it idling at 1kI had to keep it at full throttle to keep it idling at 1k

Did you rebuild this motor yourself?

ponygt65 · 12-02-2008, 12:13 PM

Quote:

Originally Posted by CompOrange

Did you rebuild this motor yourself?

+1.

I meant to ask that as well.

MACH_Daddy_#1 · 12-04-2008, 12:10 AM

Yes, I rebuilt the motor myself in my precision machine shop. Shouldn't be cam timing because when it did start it fired up and sounded great, it wouldn't do that if the cam timing was off. I've got it in a shop for diagnostic, I'll let you know what they come up with.

12-02-2008, 11:50 AM	#2
ponygt65 Registered User Join Date: Jun 2004 Location: Madera, CA Posts: 7,687	Re: Startup Trouble After Rebuild Bad Cam timing. New Tune needed. Bad Fuel. Too much/little Fuel/mixture. Fuel sensor. Vacuum leak. Could be a few things or combo there of. __________________ Current Stable: NO stangs.....DON'T F'ING remind me. Previous stangs: 2003 Mineral Grey Cobra Vert 1965 Factory GT K Code Coupe - mostly original and numbers matching. 14.9 (best) GONE BUT NOT FORGOTTEN!! 2003 MACh 1 AB - MINE!..SLP LM1s, PHP Spacer, and a CAI, that wont' stop whistling. 2004 MACh 1 DSG - PHP spacer, BOrla Stingers, K and N CAI, Tune, X-pipe, 1" 1-piece raised shaker...yadda yadda.

12-02-2008, 11:55 AM	#3
CompOrange PSR Mafia Join Date: May 2007 Location: Gilbert, AZ Posts: 2,011	Re: Startup Trouble After Rebuild I'm gonna say that your cam timing is off, MAF not hooked up properly, or you've got a really bad vacuum leak. You need to see what your fuel pressure is for sure. Should be a mandatory gauge reading in any performance car. __________________ 2010 Triumph Daytona 675 2003 Mach 1 - Azure Blue 5 speed Mostly stock...except for a few goodies

12-04-2008, 12:10 AM	#6
MACH_Daddy_#1 Registered User Join Date: Apr 2005 Location: Denver, Co. Posts: 45	Re: Startup Trouble After Rebuild Yes, I rebuilt the motor myself in my precision machine shop. Shouldn't be cam timing because when it did start it fired up and sounded great, it wouldn't do that if the cam timing was off. I've got it in a shop for diagnostic, I'll let you know what they come up with. __________________ '03 azure blue mach1 diablo chip 4.10's pro 5.0 shifter BBK Longtube Headers & O/R X-Pipe SLP cat back w/resonators Hardened 28 spline axles Rebuilt w/Forged Internals ready for action...lol Brembo f&r slotted&drilled rotors SLP Line Lock Eibach adjustable shocks/struts/springs(lowered 1/2'') Camber/Caster Plates Edelbrock upper/lower control arms & sub-frame connectors

12-01-2008, 11:37 PM	#1
MACH_Daddy_#1 Registered User Join Date: Apr 2005 Location: Denver, Co. Posts: 45	Startup Trouble After Rebuild I just rebuilt my motor after seizing a cam, got it back in the car, everything ready to go...but I'm having trouble getting it to start and run smoothly. No major upgrades were done, just forged internals. It cranks over fine, nothing wrong mechanically or timing wise because it did start a couple of times, ran fine for about a minute then died, almost like its not getting fuel pressure or to much fuel & not enough air...I just dont know. Have fuel pressure when I turn the ignition on & as far as I can tell when I'm cranking it over too. Have spark, because it did start & run on all cylinders for a minute. It's almost like its not getting enough fuel after it starts because it runs a little rough and I had to keep it at full throttle to keep it idling at 1k, or it's not getting enough air after startup, I just don't know. I think it may be: bad or clogged injectors, bad connection to the injectors(i.e. residue left on connectors after spraying intake with the solvent gun before installing), MAF, or some other bad sensor or something somewhere. If anyone has had similar problems or has any insight I would greatly appreciate any information or tips you have, I am at a loss...It does start & seems like it wants to run I just dont really know where to go from here... __________________ '03 azure blue mach1 diablo chip 4.10's pro 5.0 shifter BBK Longtube Headers & O/R X-Pipe SLP cat back w/resonators Hardened 28 spline axles Rebuilt w/Forged Internals ready for action...lol Brembo f&r slotted&drilled rotors SLP Line Lock Eibach adjustable shocks/struts/springs(lowered 1/2'') Camber/Caster Plates Edelbrock upper/lower control arms & sub-frame connectors

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