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I'm down too two things vacum leak or a fuel injector how what is some cheap ways maybe some old mechanic tricks. and there is something else I changed the plugs the first one's that came up w

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  • JEREMY SHIPMAN Dec 02, 2012

    2004 chevy impala 3800 v6 series 2

  • JEREMY SHIPMAN Dec 02, 2012

    'm down too two things vacum leak or a fuel injector how what is some cheap ways maybe some old mechanic tricks. and there is something else I changed the plugs the first one's that came up was the I guess factory plugs they where 6.99 so I went with the ac delco would that make a difference chevy impala 3800 v6 iv also changed the catalytic converter, resonator,, spark plugs and coil packs



1 Answer

You may want to give us a year,make,model,engine & start over

The motor doesn't know the brand of the plugs you install

You sort of on a guessing trip here

Need in exact detail what was tested & how & the results

Be nice to know what your problem was before you started

Posted on Dec 02, 2012


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Posted on Jan 02, 2017

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SOURCE: 99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Posted on Dec 04, 2008

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SOURCE: 97 a4 will crank up, but won't start. maybe fuel?

It is the Fuel Pump and Possibly the Fuel Filter Both Causing this no Start Problem.

Posted on Jan 23, 2009

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SOURCE: Olds Cutlass factory radio/cassette, radio doesn't work.

When you say tried different radio and it didn't work, does this mean the tuner acts like it is functioning, but you hear nothing out of the speakers?

If so, this stinks of a bad ANTENNA...

Posted on Mar 05, 2009

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SOURCE: P0300 - Random / Multiple misfire

The .030 may cause a too rapid burn time condition. And Yeah, .060 is standard GM on almost any make/model nowdays.. It may be one of ur coils.. but that would show an individual cylinder.. Try the .060's and let me know.. esp if it wasnt doing it before

Posted on Mar 11, 2009

  • 4669 Answers

SOURCE: 85 xj6 4.2lt. fuel injected, (Problem will not

Does it even try. (cough and sput) Will it start if you spray carb cleaner in it?

Posted on Mar 12, 2009

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2 Answers

Has misfire codes and idles and runs bad

replace spark plugs, spark plug wires, fuel filter, and add some injector cleaner to the gas. Any change? if not it could be something to do with your ignition system, or fuel injectors, or maybe even engine timing.

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I replaced the head gakets on my 84 Bronco II put all back together. It will start, pumping on the accelarator but it will die.Could it bet the distributor is off its mark?

Don't have anything to add to what your said

Seems you know what your doing

Recheck your work

If it won't idle, then maybe you have a vacuum leak
& that effects venturi vacuum & you don't get enough
fuel drawn in

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1 Answer

Misfiring on cylinder 1. symptoms: sputtering and engine shaking

That shop does not know how to test your cars problems

Injector Cleaner is not a fix for dirty or worn injectors

If they don't use an oscilloscope in their testing, they are
living 25 years in the past

Why did they not find the problems,they said they did lots of
testing,apparently stopped somewhere & gave up or don't
have the ability to do what is necessary

Could very well be a mechanical issue

A cylinder leak down test,mechanical or using a transducer
& scope, as well as scope the injectors & cylinder contribution
test, will tell you most likely whats wrong.

Try another shop & research their capabilty first

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P0131, P1131 codes Ford Thunderbird

Vacum leaks can be difficult to pinpoint. You can try this method, but it works sporadically for me.

get carb cleaner, start engine, spray carb cleaner on vacum hoses. If the engine idles a little faster, your leak is there.

Personally I find it easier to just replace all the vacum hoses. I always seem to find one that is cracked or has been chaffing on something. vacum hose is cheap. Its one of the things that should be done on a tuneup in my opinion.

This one gets looked over quite often. Make sure the gas cap is tight. Make sure the seal is in good shape. Make sure the oil dipstick seal is in good shape. Both of these are often overlooked when finding vacum leaks.

Try replacing the PCV. I usually change these every tuneup even if they still seem to operate correctly. I have had good luck changing these to fix rough idling.

Try running a couple bottles of fuel injector cleaner through your gas tank. sometimes this will fix your problem.

Read the owner's manual and make sure you are using the correct grade of fuel. Some high performace engines require 91 octane. Im not sure if yours does, but check the manual to make sure. 87 can sometimes cause premature detonation, which can cause the engine to loose power.

Sometimes cleaning the MAF isnt may have to replace it. I would suggest getting your car hooked up to a mechanic's code reader. Thier computer will give you more infomation than the handheld code reader you have.

Check all of the tuneup items (air filter, fuel filter, plugs, wires etc..)

Im not sure if your engine has one ignition coil or multiple. If you have a random misfire, you could check the coil(s) with a multimeter.

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1 Answer

99 Astro Van random misfires P300

Before you replace the injectors have them do an injector balance test. Normally wet weather does not effect fuel system. Sounds more like you have a crank or cam sensor acting up.

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1 Answer

1998 range rover 4.0 vacume diagrame

u could use the old trick of spraying carb cleaner in different ares while idleing, to narrow it down, but you also could have a intake manifold leak

Nov 11, 2011 | Cars & Trucks

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Engine surging up and down, hard to start, shutsdown when I remove my foot from the accelerator, sometimes stays at high 2000 rpm's while driving without using the accelerator

doug you do have some problems first thing is to ckeck your fuel pressure or it could be dirty or bad injectors or loose injector connections or a intake air leak or vacum lines or pressure regulator (fuel) it gonna be a process of elimnation hope this helps

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1 Answer

My 2005 Town & Country (3.3L Engine) 114K miles is acting strange. I often have difficulty keeping the engine running. For example the ignition key turns just fine but doesn't sustain the engine on...

New air cleaner needed? That's the simple, cheap fix. Happened to my wife's Volvo once. Thought the EFI was toast and the air cleaner was caked with gunk. Maybe dirty injectors. Try some fuel additive to clean them.

If it is the EFI system, maybe something simple like idle control valve (happened on my newish Subaru), or one of the other sensors: TPS, O2, MAP/MAF, etc. It simply sounds like it is running too lean or rich at idle. Injectors could be bad too. Sounds like you need a different mechanic.

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1996 chevy silverado 5.7 misfires on multiple cylinders have spark compression and gas

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I have 2005 f-150 Ford p/u with 5.4 liter engine. I have had truck at four different dealers and none can find out why truck runs rough, has check engine light, and shows only a code for random misfire....

the data for the code should show if the misfire is registering at idle or at a higer RPM. This is needed to know what could cause it. I hope that someone at least replaced the spark plugs so far. Next guess would be a intake gasket leak or a defective injector. If its running rough at idle start unplugging one coil or injector at a time. The engine should stumble a little if the cylinder is ok. If one does not change the idle at all then that cylinder is the one in question. Only options would be a defective injector, a defective coil, a vacuum leak on the intake, a bad spark plug, or a bad valve.

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