Typical Idle RPM? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87gmc · 02-10-2003, 08:02 AM

I just installed the tach i bought and was wondering what the normal idleing RPM for out trucks. Right now when my trucks warmed up it idles at about 400-450 rpm's and to me that seems really low. and since its fuel injected i cant manually change the idle, so any one have an idea's on how to do this?

Prerunner1982 · 02-10-2003, 08:08 AM

i know mine is high, but until i figure out my electrical problems its going to stay that way... in P or N it idles at about 900 in gear about 7-800.

Blue Beard · 02-10-2003, 08:46 AM

The idle is different for Manual or Automatic transmissions.......which is yours?

87gmc · 02-10-2003, 10:27 AM

i have an automatic, its a th-700R4

PHOENIX · 02-10-2003, 12:29 PM

My emissions/vacuum diagram reads 700rpm. I have it bumped to 800-850 so I still have full headlight power when the fan and sterio is running.

I have manual transmission.

Tom · 02-10-2003, 02:12 PM

My truck idles about 700rpm in park, 600-650 in drive with an automatic.
My 78 could do 600rpm idles, with a mad cool lope

My frineds 80 el camino has a new, rebuilt stock 350. He put a crane energizer cam [a small one] and performer intake on it with headers. It can idle, smooth as silk, at 400rpm.

02-10-2003, 08:02 AM	#1
87gmc I Got My Engine!!!!! Join Date: Oct 2002 Location: Palmer, AK Posts: 253	Typical Idle RPM? I just installed the tach i bought and was wondering what the normal idleing RPM for out trucks. Right now when my trucks warmed up it idles at about 400-450 rpm's and to me that seems really low. and since its fuel injected i cant manually change the idle, so any one have an idea's on how to do this? __________________ F.O.R.D. "F*cked Over Rebuilt Dodge" -+-+-+-+Cameron+-+-+-+- 1987 GMC HIGH SIERRA LWB 1500 32X11.50 383 TBI/Vortec Heads/Intake MSD Ignition Dual Exhaust Custom Pinstriping Sweet interior & stereo http://www.cgalvin29.freehomepage.com

02-10-2003, 08:08 AM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	i know mine is high, but until i figure out my electrical problems its going to stay that way... in P or N it idles at about 900 in gear about 7-800. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

02-10-2003, 08:46 AM	#3
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	The idle is different for Manual or Automatic transmissions.......which is yours? __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

02-10-2003, 10:27 AM	#4
87gmc I Got My Engine!!!!! Join Date: Oct 2002 Location: Palmer, AK Posts: 253	i have an automatic, its a th-700R4 __________________ F.O.R.D. "F*cked Over Rebuilt Dodge" -+-+-+-+Cameron+-+-+-+- 1987 GMC HIGH SIERRA LWB 1500 32X11.50 383 TBI/Vortec Heads/Intake MSD Ignition Dual Exhaust Custom Pinstriping Sweet interior & stereo http://www.cgalvin29.freehomepage.com

02-10-2003, 12:29 PM	#5
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	My emissions/vacuum diagram reads 700rpm. I have it bumped to 800-850 so I still have full headlight power when the fan and sterio is running. I have manual transmission. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

02-10-2003, 02:12 PM	#6
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	My truck idles about 700rpm in park, 600-650 in drive with an automatic. My 78 could do 600rpm idles, with a mad cool lope My frineds 80 el camino has a new, rebuilt stock 350. He put a crane energizer cam [a small one] and performer intake on it with headers. It can idle, smooth as silk, at 400rpm. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.



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