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Stumble from a stop.

 
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Old 25 Jan 2013, 07:49 am
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Default Stumble from a stop.

Have an 05 GT convert with autostick. When I'm at a dead stop there is a slight stumble on acceleration. No problems when I'm moving, only from a complete stop. During the warmer months I only noticed it when the engine was cold. Now that temps are at or below 0 a lot I'm noticing it a lot more. I'm thinking IAC. Any thoughts. I did plugs, wires along with timing belt and water pump about 10K ago last spring.
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Old 25 Jan 2013, 11:01 am
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Default Re: Stumble from a stop.

What fuel are you running. Also try cleaning the throttle body.
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Old 25 Jan 2013, 11:14 am
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Default Re: Stumble from a stop.

Quote:
Originally Posted by Busted_PT View Post
What fuel are you running. Also try cleaning the throttle body.
this.

Use throttlebody cleaner, not carb cleaner :-p
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Old 25 Jan 2013, 11:34 am
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Default Re: Stumble from a stop.

I have not had any problems with either. Just me. Hold the blade open for a bit so air can evaporat it some before starting.
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Old 25 Jan 2013, 10:24 pm
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Default Re: Stumble from a stop.

Quote:
Originally Posted by Busted_PT View Post
I have not had any problems with either. Just me. Hold the blade open for a bit so air can evaporat it some before starting.
I toasted my intake temp sensor with carb cleaner :-p
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Old 29 Jan 2013, 07:57 am
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Default Re: Stumble from a stop.

I always use 91 octane from Holiday gas. Last summer I cleaned the throttle body with intake cleaner. I also removed the IAC and inspected. As an update, since the weather warmed up to the 30s the problem is almost gone. Only noticing it until the engine warms up completely. This is why I'm thinking it has something to do with some sensor that's detecting air temperature.
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Old 29 Jan 2013, 03:38 pm
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Default Re: Stumble from a stop.

The car's PCM uses signal imputs from two air temperature sensors.
One in the air intake tube prior to the throttle body.
The other behind the front grille, near the radiator (poor location, it is subject to dirt & gunk).

Quote:
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...As an update, since the weather warmed up to the 30s the problem is almost gone. Only noticing it until the engine warms up completely. This is why I'm thinking it has something to do with some sensor that's detecting air temperature.
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Old 29 Jan 2013, 03:54 pm
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Default Re: Stumble from a stop.

Is the one in front of the radiator behind the grill the one used to display outside temps? If it is and it is also used for engine management it might be a problem. My outside temp gauge doesn't always read correctly. Sometimes it's way off.
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Old 01 Feb 2013, 04:45 am
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Default Re: Stumble from a stop.

Try using regular gas when air temperature is below freezing.
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