How to tune for a lopey idle
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How to tune for a lopey idle
How can I tune for a lopey idle? My first idea was to cut timing and add fuel at idle but that didn't do it. Lowering idle speed didn't get me what I wanted either.
Re: How to tune for a lopey idle
From the post it sounds like he already has a cam with a lopey idle and hes tries to smooth it out. Some people keep the car in open loop mode at idle and that seems to help alot.......
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Re: How to tune for a lopey idle
Nope, stock cam trying to get a lopey idle.
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From: Hurst, Texas
Car: 1983 G20 Chevy
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Car: 1987 IROC-Z
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Re: How to tune for a lopey idle
when I first bought the car one of my injector plugs fell off cause the clip was broken, that made it sound meaner at idle. Also ran like crap, but if you want a lopey idle with a stock cam then running like crap is what you gotta do :P
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Re: How to tune for a lopey idle
someone already said it best. If you want a lopey idle then you need to get a lopey cam. I've never heard of someone trying to get the "lopey" characteristics outta a stock cam. These cars were designed to run like most any stock car...at idle, nice and smooth.
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Re: How to tune for a lopey idle
Guess I just want to see if it's actually possible.
Joined: Jan 2005
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From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: How to tune for a lopey idle
YES, it is. Open the EGR at idle and you will find out. Thats the real reason a cammed engine runs rough at idle, the intake valve open early, which pushes exhaust gasses back into the intake, giving the engine self egr. I know because $8D controls the EGR valve differently than a TBI engine. I used the TBI EGR solenoid hooked to manifold vacuum when I first swapped to my TPI setup. I switched from the 7427 TBI PCM to the 7730 TPI ECM. When I hooked up the EGR solenoid, it allowed vacuum to the valve and the engine idled like it had a HUGE cam in it. Took me a while to figure out why the engine ran great, but idled like crap though. I hooked the solenoid up to the ported vacuum source on the bottem of the thorttle body and it works great now.
Last edited by Fast355; May 20, 2008 at 11:49 PM.
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Re: How to tune for a lopey idle
also little timing at idle will make it sound camed.... cause i just started runing my new timing tables, and got the ve close to what it needs to be, and it idles at 500 rpm, and you dont know the truck is even on, till i hit the go pedal. i added a bunch of timing at idle to quite the engine down, and smooth out my idle.
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