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2012-02-21 10:28:43 |
Engine idle 1971 V12 automatic
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Mark Parker
Suncoast Jaguar Club *
forum user since
2012-01-21
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Does anyone know the correct engine idle in neutral for a V12?
Mine is at about 1300 in neutral and drops to 900 in gear
Is this correct or may it be masking an issue ?
Thanks
Mark
Thanks
Mark |
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2012-02-21 11:12:08 |
Engine idle 1971 V12 automatic
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Blake Agnew
ember At Large *
forum user since
2012-01-07
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Mark,
Im not sure about the 71 V12s but I found my information in the service manual that comes with the car. There is a section in there about tuning your carbs and they list the proper idle RPMs. Im assuming the manual is laid out in the same manner but Im not 100% sure.
1969 Jaguar XKE 2+2
Leland, North Carolina |
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2012-02-21 14:37:09 |
Engine idle 1971 V12 automatic
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Jay Weber
Jaguar Club of Austin *
forum user since
2008-10-21
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Hi Mark,
Thats way too high. My V-12 has a manual transmission, but it ticks over at 600 rpm. That may be a little low for an automatic, even in neutral, but it shouldn't be over 800 unless you've changed out your cams. I would start with verifying the accuracy of your tach and go from there.
All the best,
Jay
1972 Series Three V-12 E-Type FHC
1967 Series One 4.2L E-Type 2+2 FHC
1961 RHD Mark IX saloon |
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2012-02-21 14:39:18 |
Engine idle 1971 V12 automatic
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George Camp
Jaguar Society of South Carolina *
forum user since
2002-11-24
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Mark Blake is correct. Do you have a handbook? Service Manual? If not you can get both from the JCNA shoppe. But here is a direct answer to this one. In your handbook (about page 64--changes slightly thru the years and do not know your year) it is 650-750. In the service manual on under carb tuning it is the same. You are on a fast idle setting or you have a vac leak or something else. Shifting the auto box into gear at 1300 is putting unessary wear on the drivetrain. Do you have your choke on or perhaps the choke has not released. In either case the handbook and service manual will walk you through 90% of your quest.
JCRC SE Member JCNA Publications JCNA Authenticity help lineJCNA RD SEVp JCNA |
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2012-02-22 02:04:39 |
Engine idle 1971 V12 automatic
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Mark Parker
Suncoast Jaguar Club *
forum user since
2012-01-21
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Thanks for the advice. Manual sais 650-750 but doesn't state manual or auto.
I will start there!
Mark
Thanks
Mark |
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