Question about Chevrolet Impala

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2002 chevy impala 3.4 engine - egr valve bolt size? I was changing the EGR valve and somehow i misplaced the 2 bolts that secures the egr valve to the engine (not the 3rd bolt that secures the exhaust line). Can someone tell me the exact bolt size so i can buy 2 new ones? i must have tossed them by accident in the box the new egr valve arrived in. thanks.

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  • info15108 Apr 25, 2010

    i went and bought both of these options and neither was even close. thank you for wasting my time and money. if i wanted someone to guess, i would have asked my 9 year old daughter. i sure hope you are not getting paid for these "solutions".

  • info15108 Apr 25, 2010

    last "expert" did not have a clue. does anyone know the actual size of this bolt?

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  • Master
  • 1,016 Answers

Hi,

This is a difficult one due to the many different sizes that are avaliable for this component.

The best thing would be to take the EGR valve in to an Autoparts shop and ask for the bolt size that fits the holes nicely. You will want it at least 1/4 inch longer then the body of the EGR valve.

By my guess you would be looking for a bolt sizes like the following:

1. 3/8 x 1/2 UNC or UNF
2. 7/16 x1/2 UNC or UNF

But the best option is to take the valve in and size up the diameter and lenght if the bolt. The thread however will be either UNC or UNF as above.

Hope this helps, let me know if you require further information

Regards

Jason

Posted on Apr 25, 2010

  • Jason Maurirere
    Jason Maurirere Apr 25, 2010

    The options I gave you would be the best way to get this problem sorted as there are many different sizes avaliable.

  • Some Dude
    Some Dude May 23, 2014

    2002 3.4 should be the same as my 2000 3.4, and the bolt sizes for all 3 bolts on my egr are 10mm. You'll need a longneck socket with a 2" extender for the base 2, then you'll only need the longneck socket on the wrench for the bolt by the hose. Hope it helps.

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  • Chevrolet Master
  • 6,927 Answers

I do not know,but 8mm is used most,the length you may can figure out,but go to the parts house,and ask for2 bolts 8mm 1.25 thread,at 25 mm long,and ask for 8mm 1.50 thread,and 25mm length,and cover your bases,they are not that high in price,if some one has them,this way you can go by this,Look at the e g r valve to make sure you can get the bolts in the holes of the e g r valve,cause the heads of the new bolts will ,no doubt be larger than the ones that came out of it,the bolts are a general,or generic if you will,and will work if you can get them in the e g r valve,and use a wrench to screw them in,

Posted on Apr 24, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 25, 2010

    Then go ask your daughter,cause remembering all the screw sizes for every car is not easy,if you read what I posted you would have noticed I said there would be a starting point,it will be metric,and starting out with what I told you,you can figure out what size you needed along with the parts man`s help,We can toss faults back and forth here all night,but it will not get your car fixed.

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Differential Pressure Feedback EGR Flow Diagram


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    Differential Pressure Feedback EGR Sensor, 3.0L (2V) Engine


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    Differential Pressure Feedback EGR Sensor, 3.0L (4V) Engine


    a23840a.gif


    Item Part Number Description 1 6049 RH Cylinder Head 2 - Differential Pressure Feedback EGR Sensor 3 - Nut (2 Req'd) 4 - Stud Bolt 5 - Bolt (2 Req'd) 6 - Differential Pressure Feedback EGR Sensor Bracket A - Tighten to 5-7 Nm (45-61 Lb-In) B - Tighten to 8-12 Nm (71-106 Lb-In)

    Engine Emission Control Component Location-3.4L SHO Engine


    a25013a.gif


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prev.gif next.gif Exhaust Gas Recirculation (EGR) Valve Removal & Installation 2.0L Zetec Engine NOTE: When the EGR tube is disconnected from the EGR valve, it must be discarded and a new EGR tube must be installed. The aluminum threads on the EGR valve must be inspected, and a new EGR valve installed if the threads are damaged.
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Detach the vacuum line (#1), unthread the EGR tube (#2) and remove the EGR valve bolts (#3) - 3.0L (4V) 02-04_escape_emissions_023.gif

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1.
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