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#1 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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idle rpm
My truck idles at between 1000 and 1100 rpm in park and about 750 in gear it is an automatic is this about right?
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#2 |
Senior Member
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Location: Lewisville, Nc
Posts: 10,234
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Re: idle rpm
sounds good to me lol
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#3 |
A.K.A- Crummy
Join Date: Jun 2005
Location: NC foothills
Posts: 3,025
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Re: idle rpm
Sounds within range. Mine is a straight drive. Idles around 900rpm. Usually a bit higher for an automatic.
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2003 Silverado Z71 Are fishermen all liars? |
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#4 |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: idle rpm
Man, y'alls trucks idle high. Mine idles around 750 in park and 500 in gear (700R4 auto). Motor is a 350. My 00 z71 has some kind of idle speed sensor and it will always idle at 500rpm in park or in gear. Here's a pic of her idlin in park. Are you using a stock dash tack? I've heard they can be off by a couple hundred rpms. Do "built" motors usually idle higher?
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 01-26-2006 at 10:27 AM. |
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#5 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: idle rpm
mine is after market tach I think It might be a tad high but 500 in gear I think mine would never run.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#6 |
I miss this truck.
Join Date: Dec 2001
Location: Lexington, KY U.S.A.
Posts: 2,863
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Re: idle rpm
A bit off the subject, but still interesting. My '94 350 automatic idled at 400 RPM. I made some adjustment to the Cruise Control cable and raised the idle to 440 RPM. I couldn't even hear the difference, but every time I let it Idle for a few seconds (like at a red light) the check engine light would come on. Took some time to figure that one out.
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'07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT. |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: idle rpm
I think 750 - 800 in neutral is the norm for a small block.
My caddy idles pretty low. My tach is so stupid I can't go by what it says, but it sounds like the 500 -600 in park and 400 - 500 in gear. |
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#8 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: idle rpm
I read some things online and they say around 600-650 for automatic (350)are they talking about in gear or in park they dont say and they only give one number.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: idle rpm
I would imagine in park.
I would cringe dropping my tranny into gear at 1100 RPM... |
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#10 |
On the college boy budget...
Join Date: Oct 2005
Location: Athens, Georgia
Posts: 370
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Re: idle rpm
My truck idles between 1000-1250 when it park and about 900 in gear when its cold. Once it warms up its probably around 750 in park and 500 in gear.
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-'68 C10 short/step- 350/350 |
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#11 |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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Re: idle rpm
Speak of the devil! I just had to fool around with mine to pass emissions today! Haynes says 900 (in "P" I presume) for an MT; 600 for AT 350. Not to hijack the thread but what, if any (aside from passing emissions), will be the effect of turning the air/fuel screws on an Edelbrok 1406 1.25 turns leaner while turning the idle screw to that rpm?
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#12 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: idle rpm
got mine down to about 750 in park and about 550 in gear seems ok little rough but it also has a cam. Will see how it is in the morning in the cold.
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#13 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
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Re: idle rpm
mines the same as 67chevyredneck ...... 350/th350 ... park around 750 and 500 in drive at idle ... he also has the same tach as me too .... wierd
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71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
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#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: idle rpm
gotta love looking at the reflection of the tach light on the windshield at night huh?
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#15 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
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Re: idle rpm
i usually dont pay much attention to it .. but if i does get on my nerves .. i dim my whole dash down
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71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
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#16 | |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: idle rpm
Quote:
I was an idiot and didn't install the extra ground strap inside the dizzy when I put in the 350. Couldn't get the dang truck to run right. Sometimes it would idle at 900-1000 and wouldn't come down and I'd cringe when I put it in gear cause it would almost slam into gear. Then the gear idle was around 700 and it felt like the truck was "pushing" when I was holding the brakes. I fixed the dizzy problems (wish I woulda know bout this board 2 years ago) and she runs like a top. Is it ok for a truck to idle at higher rpms? Seems like it would wear the tranny when sittin at readlights.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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#17 |
A.K.A- Crummy
Join Date: Jun 2005
Location: NC foothills
Posts: 3,025
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Re: idle rpm
Mine seems smoother at around 900. When releasing the clutch it bogs and goes with very little throttle. Maybe being a 4x4 makes a difference. I have played with it at lower rpm's but is more comfortable to drive at the current setting. I also have had 4 different carbs on it and all with the same result as far as idle position.
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2003 Silverado Z71 Are fishermen all liars? |
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#18 |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Re: idle rpm
For a stock-type idle (not a cammed-up engine), normal is about 750-800 in park and 600-650 in drive.
If you've got some lope all bets are off. Somebody mentioned having a higher idle when cold, then lower when warmed up. Sounds like a fast idle cam not being kicked down before you put it in gear. ![]() If your idle is over about 850-900 in park, you're probably beyond the idle circuit and can't adjust your idle mixture with the screws.
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1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! Last edited by MrC1; 01-27-2006 at 11:12 AM. |
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#19 |
Senior Member
Join Date: Mar 2003
Location: St robert Mo
Posts: 2,001
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Re: idle rpm
Would I be right to assume the lower I can get it the better for the engine? As long as it runs?
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1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO |
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#20 |
Registered User
Join Date: Dec 2005
Location: Flin Flon Manitoba
Posts: 327
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Re: idle rpm
my 350 runs at about 850/900 rpm at idle but it's also a manual tranny
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#21 | |
I miss this truck.
Join Date: Dec 2001
Location: Lexington, KY U.S.A.
Posts: 2,863
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Re: idle rpm
Quote:
I don't know that it wouldn't be best to keep a minimum RPM for the Alternator as well.
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'07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT. |
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#22 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: idle rpm
sitting say at a long red light, idleing at 900 or more in gear, does build up some heat in the tranny... not real extreem, but more so than needed. It is also very rough on your tranny and u_joints...and the rear diff, when it slams into gear.
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#23 |
Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Re: idle rpm
Agree with the last post. Too high of an idle is hard on the tranny due to excessive heat buildup and the rest of the drivetrain if it's slamming into gear. Too low of a idle is bad for the engine due to poor internal oiiling and coolant flow. It's also not good for the tranny for the same reason - poor oil flow. If the RPM drops low enough, the tranny could actually be somkewhat disengaged.
To tell you the truth, the engine alone would probably be happier at a very high RPM due to the good oiling frm crank throw. Of course, that doesn't happen too much until about 2000 RPM, so that one's out the window. ![]()
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1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status! ![]() 1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! |
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#24 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
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Re: idle rpm
would a missing ground strap in the dizzy really cause those problems .... i've never had one in mine .. never noticed any trouble
__________________
71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
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#25 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: idle rpm
Are you talking about the one that goes from the coil hold down bolt to the harness plug?
Would one even work without that? |
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