Idle RPM

jesus888 · Nov 9, 2009

What RPM should my Ford EFI 302 HO motor with a very mild cam idle at? 750 is what was suggested from a friend, but the motor's idling at 980 with 11 degrees timing and the idle adjust screw backed out almost completely.

barronj · Nov 9, 2009

Do you have too much tension in your throttle linkage?

(I've been there, (fabbed cable))

jesus888 · Nov 9, 2009

Nope, using BC's throttle cable... and we have adjusted it to not have any slack, but it's not too tight.

Viperwolf1 · Nov 9, 2009

Have you tried it with the throttle cable disconnected? There was a thread just last week about setting idle speed.

4G5 · Nov 9, 2009

I'm thinking somewhere between 650 and 750 tops. But I'm also a carbed guy. Good luck!

75junebug · Nov 10, 2009

Did you set the timing with the thingabob plug unplugged? How is your idle bypass valve?

jdcone · Nov 10, 2009

That would be vacuum advance plugged.

barronj · Nov 10, 2009

Didn't read it through the first time, now I see you're EFI.

You might need to clean out your IAC, or your idle air control/bypass. It can suffer from carbon build up if you're running used equipment. Secondly, once you set your idle w/your idle set screw (after you've figured out why you're idling high) then you set your TPS. You will screw up the settings if you've left the TPS alone & you're running the idle set screw in & out.

What kind of throttle body are you using? Accufab, while pricey, is "the dope", or tits, both in looks, and quality/performance. BBKs can trend on the junky side, with whistling issues, throttle blade screws that back themselves out & get sucked in to the engine, needing a hole drilled in the blade to eliminate whistling, etc.

You can search "TPS" on Corral.net to figure out what settings are deemed optimal.

The TPS settings are as controversial as dropping an LS1 in a Mustang for many. I think it's like .998, but research it.

jesus888 · Nov 11, 2009

Gonna check with my buddy doing the engine work before I reply

phred · Nov 11, 2009

You don't have that thing running yet? I had a similar problem with the throttle cable on mine. I loosed it up until I had just the tiniest bit of slack and the idle is now fine. Before I always had way too much idle speed and could not get rid of it with timing or otherwise. Unhook the cable and see it that does the trick. If so just loosen the cable some.
Man you gotta get that thing on the road so we can all see it.

scotts77 · Nov 11, 2009

I fabd up a tensioner spring for my BC cable. Other things to check, unmetered air entering the engine, dirty MAF sensor, throttle blade, is the IAB functioning correctly ?

broncaholic · Nov 11, 2009

phred said:
You don't have that thing running yet? I had a similar problem with the throttle cable on mine. I loosed it up until I had just the tiniest bit of slack and the idle is now fine. Before I always had way too much idle speed and could not get rid of it with timing or otherwise. Unhook the cable and see it that does the trick. If so just loosen the cable some.
Man you gotta get that thing on the road so we can all see it.

Shoot! I am still f'ng with my IAB vlv. Thing will not idle cold but runs great warm. Installed the IAB bypass plate and still the same friggin problem! You're doin' good Bro.

Idle RPM

jesus888

Sr. Member

barronj

Bronco Guru

jesus888

Sr. Member

Viperwolf1

electron whisperer

4G5

Full Member

75junebug

Sr. Member

jdcone

Sr. Member

barronj

Bronco Guru

jesus888

Sr. Member

phred

Bronco Guru

scotts77

Sr. Member

broncaholic

Full Member

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