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Old 09-14-2015, 07:07 AM   #1
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Still Having Engine issues...2003 GT

Well, the good news is, my car no longer overheats; it holds coolant pressure and all is working well within the coolant system. Also, my car doesn't break-up under any sort of acceleration now, no matter the gear or RPM.

The bad news is, things still don't seem 100% right with my engine. When starting up from cold, my old 2004 used to fire up almost right away and it would go straight into warm-up mode; in other words, from my experience, it goes right to almost 2000 RPM, then slowly dies down to idle, with it being loud in the process until it warmed up enough for it to drop to full idle. No strange noises, smooth running, etc.

With this 2003, it doesn't do that at all. When starting up, it fires up almost immediately, but instead of turning on and going straight up to almost 2000 RPM, it stutters for a good couple seconds, then fires up and goes straight to an idle at 800 RPM. If it's first thing in the morning, it'll sometimes make a loud tapping noise for a couple seconds, but then that goes away. If I get out, I can hear a bit of tapping when running, but I also heard the same from my 2004, so I can't imagine that's a problem.

So far I've replaced the EGR valve, the intake manifold with new gaskets, thermostat, radiator fan, fuel filter, spark plugs, and air filter (on a cold air intake). I've insured that all installations on those parts were 100% correct when I did them. Also should point out this things has 170,000 Miles on it, so I'm expecting to be replacing things.

Anyone have any idea what my problem could be? I know I could still throw in a new battery, alternator, coil packs, fuel injectors, and fuel pump (even though fuel rail pressure is where it should be), just to be sure I took care of all "tune-up items." Considering it's high mileage, I'm sure everything could use replacing, and worst case scenario the engine could just be incredibly tired by this point and I should consider rebuilding it or replacing it.

Please let me know what you think. I wanna get to the bottom of this!!
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Old 09-14-2015, 08:01 AM   #2
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only thing i can think of is to try and find any info you can on what happens during a startup. what sensors are involved, its cycle modes, etc. It could be low voltage, maybe a bad battery, or alternator. make sure you check those with a volt meter or go to an advance autoparts and have them run a test on the battery and alternator. It could very well be a weak coil, but you should feel the car get very sluggish when accelerating. Otherise possibly a bad Idle Air Control valve. A lot of people go straight to that when it isn't the issue, but it is possible your car is not getting the right amount of air it needs from the iac during a start up (stuck closed). you can try cleaning it. occasionally (and i mean Occasionally) that can fix the issue.
Usually when people have issues with the fuel pump, it is usually heat issues more than not being warmed up issues. all i know is that after startup, when the temp is not up to almost 200 degrees in the engine, its set to run rich to help speed up the warm up process. So it should be disregarding any readings from the 02 sensors for the most part. those start effecting your engine after warm up.
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Old 09-14-2015, 10:57 AM   #3
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Get u an obd adapter 20 bucks ebay with Bluetooth and some engine management software like torque pro and run some logs. It monitors 932 sensor points on an 03 mustang realtime. If anything is off it'll tell u

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Old 09-14-2015, 11:13 AM   #4
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also worth takin a read PaladinMicro.com just in case. I dont know for sure if its an IAC issue, but might be worth looking into. worst case, you just end up more familiar with it and what it does.
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2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
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Old 09-14-2015, 02:00 PM   #5
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Well, unfortunately I have spoken too soon, for this afternoon I was heading somewhere, it started missing, then when I parked and turned it off, it started puking coolant through the cap -___- new cap too...it must've loosened up because after that I went to check the remaining level and it was way too loose, and I vividly remember tightening too.

I'm starting to think it's a head gasket 😐


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1997 Ford Mustang GT (Rio Red) (RMR #7832)

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Old 09-14-2015, 03:28 PM   #6
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What's the oil and coolant lookin like?
Are you thinking that coolant Is entering the combustion chamber while it sits?

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2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.
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Old 09-14-2015, 04:29 PM   #7
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Head gasket or intake. Probably head gasket tbh. Do a leakdown test on the cylinders that were missing-- Keep an eye/ear on your coolant bubble status. And what color is your coolant now? What kinda thermostat you running?
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Old 09-14-2015, 04:34 PM   #8
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Quote:
Originally Posted by TheJigShow View Post
Well, the good news is, my car no longer overheats; it holds coolant pressure and all is working well within the coolant system. Also, my car doesn't break-up under any sort of acceleration now, no matter the gear or RPM.

The bad news is, things still don't seem 100% right with my engine. When starting up from cold, my old 2004 used to fire up almost right away and it would go straight into warm-up mode; in other words, from my experience, it goes right to almost 2000 RPM, then slowly dies down to idle, with it being loud in the process until it warmed up enough for it to drop to full idle. No strange noises, smooth running, etc.

With this 2003, it doesn't do that at all. When starting up, it fires up almost immediately, but instead of turning on and going straight up to almost 2000 RPM, it stutters for a good couple seconds, then fires up and goes straight to an idle at 800 RPM. If it's first thing in the morning, it'll sometimes make a loud tapping noise for a couple seconds, but then that goes away. If I get out, I can hear a bit of tapping when running, but I also heard the same from my 2004, so I can't imagine that's a problem.

So far I've replaced the EGR valve, the intake manifold with new gaskets, thermostat, radiator fan, fuel filter, spark plugs, and air filter (on a cold air intake). I've insured that all installations on those parts were 100% correct when I did them. Also should point out this things has 170,000 Miles on it, so I'm expecting to be replacing things.

Anyone have any idea what my problem could be? I know I could still throw in a new battery, alternator, coil packs, fuel injectors, and fuel pump (even though fuel rail pressure is where it should be), just to be sure I took care of all "tune-up items." Considering it's high mileage, I'm sure everything could use replacing, and worst case scenario the engine could just be incredibly tired by this point and I should consider rebuilding it or replacing it.

Please let me know what you think. I wanna get to the bottom of this!!
clean or replace IAC ON THROTTLE BODY DO A GOOD CLEAN ON THROTTLE BODY PROBLEM FIXED
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