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Car hesitates as you are driving at high speed the car loses po wer momentarily

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  • Cars & Trucks Master
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This is something or it is hard figure out.

Posted on Apr 28, 2013


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Posted on Jan 02, 2017

  • 3600 Answers

SOURCE: PO 420 and PO 455 codes

There are three things that can cause this that is unrelated to the cap, if the valve on the carbon canister is defective it would cause this it would also cause a vacuum leak making the car run lean so check the carbon canister check valve first. Next your EGR valve could be dirty or not functioning, depending on the model and engine size it may have two EGR valves one a mechanical and the other the digital EGR and it to may be dirty, if it's dirty it can be taken apart and cleaned with carburetor cleaner and clean the pintal. And lube the pintal valve. If you’re careful and not tear the gasket you can reuse it. If this does not seam to fix the problem then you have a vacuum leak or the device that pumps pressure into the gas tank may be defective.

Posted on Jun 27, 2009

bogdanodwazn
  • 5645 Answers

SOURCE: My car is losing horse power. Could it be the idle ? Or timing belt?

could be clog catalytic con.check air filter,fuel filter.tune up.

Posted on Mar 08, 2013

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My car is losing horse power. Could it be the idle ? Or timing belt?


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In delay cycle wiper hesitates


Hi,
The hesitation of the wipers in delay cycle is normal. You can twist the nob on the end of the arm to speed up or slow down the hesitation.
If you are driving in a light mist and the wipers ran at normal speed most of the time the would be wiping a dry windshield. Chattering and bouncing. With the delay set at the right speed the wipers only go on every so often, No dry chattering. In a full rain just twist the knob past the delay cycle to get low or high speed from the wipers.
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2 Answers

PO 420 and PO 455 codes


There are three things that can cause this that is unrelated to the cap, if the valve on the carbon canister is defective it would cause this it would also cause a vacuum leak making the car run lean so check the carbon canister check valve first. Next your EGR valve could be dirty or not functioning, depending on the model and engine size it may have two EGR valves one a mechanical and the other the digital EGR and it to may be dirty, if it's dirty it can be taken apart and cleaned with carburetor cleaner and clean the pintal. And lube the pintal valve. If you’re careful and not tear the gasket you can reuse it. If this does not seam to fix the problem then you have a vacuum leak or the device that pumps pressure into the gas tank may be defective.

Jun 27, 2009 | 2004 Pontiac Grand Prix

1 Answer

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To what degree do you lose power and in what way? Do you loose over-drive or does it loose power and speed (on the streets, highway, or at any speed). From your discription it does sound like either a fuel flow/pressure issue or a clogged cat.

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