Question about 2002 Chevrolet Impala

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Rough accelleration Idle is fine but accellerating very rough only 30,000 miles on this vehicle doesn't do it everytime.

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Go to a mechanike

Posted on Mar 04, 2009

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6ya6ya
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1 Answer

Quick accelleration causes the engine to die. Engine idle will not increase with adjustment to idle screw.


What make , model and year vehicle ? The idle on most vehicles are controlled by IAC - idle air control valve , by PCM - engine computer .

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Engine runs rough and gets worse when accellerating


PROBLEM TROUBLE AREA
Rough idle, stalls or
hesitate on acceleration :
.Spark plug faulty
. High-tension cords faulty
Ignition problems:
• Ignition coil
• Igniter
• Distributor
. Incorrect ignition timing
Vacuum leaks:
. PCV valve and line.. .
. EGR line..
. Intake manifold.
• Throttle body
• ISC valve
• Brake booster line

• Throttle body
• Brake booster line
. Incorrect idle speed
. Reset timing
. Adjust valve clearance
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. Incorrect valve clearance
. EFI system problems
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I replaced the fuel pump on my 2002 sunfire. It worked great the first day. The next day i needed a litre of oil so i put it in, then when i start the car it will idle but ruffly or stall. So when i put...


yes there is a trottle position sensor.
but first have engine code retrieve if any
if it run rough idle we don't talk tps
spark plugs, wires,fuel pressure if it's good alot of to do
if you have a scanner you could see the data

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Stumbling Idle


possibly ajusting itsself. any severe weather/pressure changes in your area? and if so does your cars cpu compensate for this (thinks its at a different elevation etc then resets its idle proper after a certian time? I have heard of this but not sure if VW uses it) perhaps ask the service tech.

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2 Answers

Rough accelleration from Idle


try changing the ignition control module in the bottom of the distributor this controls the firing of the plugs and usually when they get hot is when they start acting up. not very expensive plus you can take yours off and have it tested at a parts store.

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1 Answer

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A quick fairly easy thing to check is your mass air flow sensor. It can be cleande with a Q tip and carb cleaner. They tend to collect gunk and don't work as well as they should causing similar problems.The small wires that need to be cleaned are somewhat delicate so be careful.
If this dosent help, at least you know that's not the problem!

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1 Answer

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Sounds more like a mass air flow sensor problem.

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1 Answer

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I would suggest a few things ... first and the most important... check that you have the wires in the proper order on the distributer. next have the timing checked.

Robert

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1 Answer

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i think you should change the fuelfilter.

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