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Old 02-28-2014, 08:37 AM   #1
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HUGE throttle lag

2003 V6 Mustang 5spd 120k miles

I just got this car. I noticed that there is a major lag in responsiveness. Is this normal? Is there a correction? There is at least a 1 second delay. This affects shifting severely. When I let the clutch out and press the gas the car wants to stop because there is no power being applied yet even though my foot is on the throttle. Finally, one second later, the rpm start to climb. It's horrible. I can make a video if my problem is not clear. It doesn't just happen when I'm trying to shift it happens even if I just rev the motor in neutral. The pedal is set up right. It's something else.

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Old 02-28-2014, 05:09 PM   #2
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Try the ignition system. Coil pack, wires, and plugs. Clean EGR valve and IAC. The most expensive problem might be clogged catalytic converters.

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Old 02-28-2014, 05:21 PM   #3
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I would got to Autozone and have the codes ran. Write the codes down and come back.
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Old 02-28-2014, 07:11 PM   #4
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After checking what JIMMY mentioned, just quickly look at or wiggle the air intake, pcv connection, MAF connection, air filter connection, vacuum hose connections, TB & air intake connection.?.?
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Old 02-28-2014, 08:47 PM   #5
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Fuel injectors?
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Old 03-01-2014, 08:26 AM   #6
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After experimenting, it's only about a 2/3 second delay. I also noticed that when I rev my car, it stays reved for a REALLY long time. Is this just what mustangs do? I rev it to 3.5k and it slowly goes down. I mean literally 4 seconds just to get to 2k. I'm used to cars reving to 6k and going back near idle in 2-2.5 seconds. Maybe this is a window into what is causing the lag. I will start trying all of your suggestions when I get a nice day to work on it. Which won't be soon because I'm supposed to get 8" of snow tomorrow night :/
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Old 03-01-2014, 09:59 AM   #7
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Definitely not normal for such a delay to get to idle. Keep us posted!

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Old 03-01-2014, 08:03 PM   #8
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The engine hovering like that is the iac. There's nothing wrong with it that's just how it's set up. You can make a play to go between the iac and the intake to prevent so much air from going through the iac and it will go from 3k back to idle real fast. To do this mod go to the store buy two iac gaskets and trace the gasket onto a piece of metal cut out the shape then when you drill out the holes drill one the stock size and drill the other one 3/16 inch and put it in with the 3/16 hole on the vacuum side away from the throttle body. this will fix that hover.
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