Car bogging down when hitting gas updates - Forums at Modded Mustangs
 
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post #1 of 6 Old August 13th, 2012, 01:55 PM Thread Starter
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Car bogging down when hitting gas updates

So I've been having a problem with my 03 GT vert (55k miles) where the car bogs down when you hit the gas. I could be sitting at a red light and when it goes green an old lady can walk faster than my car accelerates. Takes a good 4 seconds for it to get up to say 8mph. However, I've noticed it only gets that bad when the car is warmed up. When cold the car runs so so, but still not performing like it used to. As soon as the car is warmed and I am driving around it starts acting like absolute sht. I hit the gas it doesnt want to go fast. Sounds like the exhaust is going puff puff puff at fast intervals. (AND LET ME CLARIFY) When I hit the gas hard at a complete stop say, the exhaust does not sound like it's reving normal. It makes that puff noise when warmed up at low RPMS which is not as present on cold start.

Also noticing now that I dont know if I hear the radiator fan going on as of last week, but that still doesnt explain why it acts poorly even when cold start. This might be a separate issue, because it has been doing this for awhile now and I remember hearing the radiator fan a few weeks ago. Engine temp gauge is in the middle and has never overheated.

NEW PARTS:
MAF $180
FRPS $60
Fuel pump $155 (2nd one)
Entire Fuel module assembly unit $379
Fuel Pump Driver module $35
Motor mounts $200
Transmission flush
Oil change done recently
Fuel filter 6 months ago
Added Royal purple ice to coolant
Ran gumout carb/fuel cleaner

Now I have a theory that may or may not make sense. Is it possible that when my fuel pump was changed and they had to drop the tank that maybe they disrupted some sediment on the tank wall that has since made it's way into the fuel filter? I just had the filter changed no more than 6 months ago, but could it be clogged again from 3 weeks ago?
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post #2 of 6 Old August 13th, 2012, 04:32 PM
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check the fuel pressure, you can use a scan tool to see, should be 40psi at idle.
sounds like a misfire to me, but instead of throwing parts at the car, i would:
Leak down test
check plugs, check coils, check the boots for cracks on the coils
check for vacuum leaks, could be a cracked intake manifold, or intake manifold gasket.
I don't think it's fuel related, as it seems more temp. related.
misfires dont' always set the engine light, I'm thinking you have a misfire from either plugs, coils, or intake manifold/gasket.
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post #3 of 6 Old August 14th, 2012, 02:35 AM
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My car bogs when rev matching to downshift, and I can't figure it out either, its the most annoying thing.


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post #4 of 6 Old August 15th, 2012, 12:21 PM
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Cool

One thing is checking what type of gas you use.
I would use premium gas , Shell, Chevron, Exxon ....
I usuall buy my gas from the the same stations , no mom & pop stores .
Previous posters gave good advice also .

Have you driven a Ford lately ?
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post #5 of 6 Old August 15th, 2012, 03:43 PM
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Quote:
Originally Posted by GP-SE View Post
check plugs, check coils, check the boots for cracks on the coils
check for vacuum leaks, could be a cracked intake manifold, or intake manifold gasket.
I don't think it's fuel related, as it seems more temp. related.
misfires dont' always set the engine light, I'm thinking you have a misfire from either plugs, coils, or intake manifold/gasket.
This is what happened to my car and it exhibited the exact same symptoms as your car OP so I would definitely check into it. Shine a light down into the spark plug wells and see if there is coolant pooling around the plugs. Also, most likely place of cracks/hairline fracture is at the passenger side rear where the heater hose goes into the intake manifold.
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post #6 of 6 Old January 7th, 2013, 01:46 PM
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Is you maf aftermarket? An aftermarket maf requires a tune be done to run correctly with out bog.

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