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Need Correct Engine Idle Speed
#1
All,

Since I have not purchased a shop manual for my car yet, I'm trying to get this info in the cheap. All I'm looking for is the correct engine idle speed. I have a 73 T5 coupe with a 351 CJ, 4 speed manual tranny, edelbrock performer intake, and a holley 650 (model 4150) double pumper. It looks real easy do, I just need to get the correct number. Thanks!!

[Image: 1_24_09_13_4_29_06.png]
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#2
750 rpm is probably about right without having a book to look in

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#3
73StangCoupe;79195 Wrote:Since I have not purchased a shop manual for my car yet, I'm trying to get this info in the cheap. All I'm looking for is the correct engine idle speed. I have a 73 T5 coupe with a 351 CJ, 4 speed manual tranny, edelbrock performer intake, and a holley 650 (model 4150) double pumper. It looks real easy do, I just need to get the correct number. Thanks!!

Believe it or not, the shop manual does not have this information. It refers to the CAR SERVICE SPECIFICATIONS manual. Outside of the one my Father purchased with his '73 Fastback in June, 1973, I have never seen one. The one I have is the Second Printing, March, 1973 and I would suspect this is the last printing for 1973.

The idle speeds can be found in

Group 21 Engine
Page 25
Engine Performance Specfications.

The CURB IDLE specifications for all motors refer to Footnote 1:
Set To Specification Shown On Engine Decal.

Fast Idle is listed as 1300 RPM for a 4v. Interestingly 1500 RPM for a 2V.

When I discovered this a couple of months ago, I asked members to take photos of their engine decals to compile in a WIKI. Response was very weak. Perhaps you can ask again.

james

[Image: 29cn9z9.jpg]

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#4
1000 rpm is the proper idle speed according to the 1973 emissions sticker for a 351 4V 4 Speed car

Fast idle is with the choke engaged.

still 750-825 is always a good starting point with aftermarket components

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#5
Look here. http://npdlink.com/store/products/D_191-125672-0.html
Given the fact that it is unlikely the engine is as it was from the factory (mods). The listed idle speed may not be what you really need. Chuck
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#6
ultimately, your cam will dictate how low it can go. Mine doesn't like much below 850.

[Image: Image3.png]
Jim
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#7
My thanks go to all that replied. I know this is a very simple thing, it's also pretty important. This forum and the folks that are always there to answer any question, are such an valuable resource when it comes to keeping these beauties going down the road. You all do it with such ease, I'm not sure you actually realize how helpful you all really are. Anyway, I had it set at 800 RPM but when I put the A/C on, it almost stalled out. I have it back up to 1000 RPM, that seems to be where it should be, especially with the A/C on. Thanks again.

[Image: 1_24_09_13_4_29_06.png]
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#8
73StangCoupe;79267 Wrote:I have it back up to 1000 RPM, that seems to be where it should be, especially with the A/C on. Thanks again.

You can add an AC THROTTLE KICKER Solenoid which will boost up your idle when you turn the AC on.

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#9
c9zx;79257 Wrote:Look here. http://npdlink.com/store/products/D_191-125672-0.html
Given the fact that it is unlikely the engine is as it was from the factory (mods). The listed idle speed may not be what you really need. Chuck

Thanks Chuck,

I have that sticker on the driver side valve cover, just can't read it. Time to get a new one...

[Image: 1_24_09_13_4_29_06.png]
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#10
Jeff73Mach1;79211 Wrote:1000 rpm is the proper idle speed according to the 1973 emissions sticker for a 351 4V 4 Speed car

Fast idle is with the choke engaged.

still 750-825 is always a good starting point with aftermarket components

I didn't know that 1000 rpm was the proper idle speedUndecided. I just set mine by ear, and with the build I have it idles perfectly smooth at 950-1000.Big Grin Anything lower than 900 rpm's it sounds like it is straining to keep running.Tongue

1973 Mach 1 Q code, 4 speed toploader w/3.70 traction lock
Freshly rebuilt with boss closed chambered heads, flat top pistons, adjustable roller rockers, Erson flat tappet cam, ARP bolts thru out, 10/10 crank, port plates, edelbrock performer intake, Holley 4160 750cfm duel feed, Hooker Comp. full length headers, custom h-pipe to dual Hooker mufflers. Specs out to 415 H.P.[quote]In the words of Ricky Bobby, " If you ain't first your last" Ha, Ha, Ha Tongue
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