How smooth is your idle?
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Posting Guru
Joined: Jan 2005
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How smooth is your idle?
Just a general question for everyone, regardless of motor. Do RPMs fluctuate in park, drive? Idle RPM speed? etc?
I get a 30-40RPM fluctuation in idle in either park or drive. about 700RPMs in drive, 800RPM in park/neutral.
Anyways, just wanted to see.
351w, 1990, 220,000 miles.
I get a 30-40RPM fluctuation in idle in either park or drive. about 700RPMs in drive, 800RPM in park/neutral.
Anyways, just wanted to see.
351w, 1990, 220,000 miles.
Cargo Master
Joined: May 2004
Posts: 3,007
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I don't think that there should be a pulse in the RPM's after the engine is fully warmed up. Variation from RPM in park to drive while braked to a stop would be expected tho, due the the transmission load while in drive.
Junior User
Joined: Oct 2011
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When warmed up my 5.8 is fairly smooth except for the lope every 351 i have owned has. While it is warming up it fluctuates about 500 rpm. If the defroster or air is on it does that even if its warm. I can never get a 351 to idle as smooth as the 289 in my old mustang I think it has something to do with the different firing order. It pulls down a little shifting into drive but then returns
Postmaster
Joined: Jun 2001
Posts: 2,809
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From: Loveland, CO.
When warmed up my 5.8 is fairly smooth except for the lope every 351 i have owned has. While it is warming up it fluctuates about 500 rpm. If the defroster or air is on it does that even if its warm. I can never get a 351 to idle as smooth as the 289 in my old mustang I think it has something to do with the different firing order. It pulls down a little shifting into drive but then returns
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
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From: Caracas, Venezuela
I think he isn't referring to iddling per se, but asking if there are any changes in iddling RPM from gear to gear.
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Junior User
Joined: Oct 2011
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I dont know for sure how many miles i have on this engine maybe 120 or so. Built it myself and i didnt have the rotating assembly balanced it doesnt have a bad shake like its cammed or anything but it and all the work trucks i drove in the 90s had the same slight shake at idle. it goes away as soon as you touch the gas.
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