How do I reduce the cold idle speed w/Kjet?

http://www.auto-solve.com/mech_inj.htm

Specifically: http://www.auto-solve.com/mech_inj.htm#MFI12

I know people who "adjusted" the idle speed by adding a restriction to the rubber hose either in front of, or behind the auxilary air valve.

 

80-83 cars had a different system than all others for the purpose of passing the federal cold startup requirements. An engine even when cold runs cleaner at 2000 rpm than it does at 1000 rpm. In addition it heats up the cats faster so that helps it run clean faster as well. It is all done by that vacuum operated idle air by-pass located by the right front corner of the plenum chamber next to the oil dipstick.

The vacuum supply hose runs through an electro switch. Just run the vacuum hose straight from the vacuum source (plenum) to the vacuum pot on the air valve.

 

Thats a good source but it is not applicable to the 80-83 308/Mond.

 

Is it entirely different, or just the cold idle system?

 

Just the cold system. In addition to the aux air valve it has a supplimentary airvalve on a temp sw that causes a very high idle until it gets some water temp and then just shuts that portion off. The aux air valve that runs in parallel to it has an internal bimetallic strip that slowly closes the additional air just as in most other K Jet cars. The supplimental valve was a US only addition.

 

Yes, the 83 is different cold start system wise.

Simple to disable it. Take the 2 electrical connectors at the coolant tank and jumper them together with a jumper. No more high idle on cold start. It will fire up and should stay right around 1000 rpm. This can't be done the same way on 84s and 85s. though.

 

You're welcome.

 

I stuff an old injector rubber bushing into the hose end. Cost Zip, and brings the idle dowwn to just right. This has worked on 2 and 4 valve 308's
Kermit

 

Same here! BTW Rifledriver, if you are ever in Seattle I would like to buy you a drink...and take you to the range so you can give some tips on riflecraft. Books are fine, but sometimes you just need someone to critique your shooting position, trigger press and use of natural, respirtory pause (empty lung technique).

 

Dave I am a little rusty and am certain I could use the advice of a well trained observer but just so you know I am a high master, Distinguished Rifleman, and was a trigger puller on the winning 6 man service rifle team at Camp Perry in 92.

A short story. The last time I got critiqued like you offer it was while I was in a shoot off (and won) the any/iron 1000 yard match at the California State Championship against a couple of the US Palma team shooters. It was very welcome and Noma was right but I laughed anyway. I told her she was the only one that had the balls to tell the winner that he wasn't doing it right.

 

Hi Dave, next time you are up my way we should get together with a close friend of mine who is a Federal officer & firearms instructor & let you fire this bad boy! Its 50 cal. Dangerously COOL! It his new toy.
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Brian,
I think you misunderstood, I am looking for some tips/advice. I have little to give.... Hell, I don't even have a scoped rifle...all iron sights. But it was proven to me that you can hit man size targets out to 400 meters...we did it at Gunsite a few years ago. Gotta go prone though. I can hit pretty fast going to a squat out to 200 or 250.

 

Those 50's are punishing...I have shot a friend's Robar custom 50. Not something I enjoyed. I'll stick with an M1A or AR, thanks.

 

You're right I got it backwards.

I mostly shoot irons at 1000, have a better average than with a scope. In infantry trophy with an M14 w irons on silhouettes at 600 you need 25 or more hits in IIRC 50 seconds to be in the game. That includes a magazine change.


50's are for people that can't read wind.

 

i don't know if this is overkill but on my 81 308 i removed the hose to the supplemental air valve and found a wooden dowel that was a tight fit in diameter and cut off about 3/4 of an inch length. I drilled successively larger holes until I liked the cold idle speed (about 1800). you can tailor the speed to anything you want and still get a fast idle in cold weather. before the idle went to nearly 3000 and scared the hell out of me. jon s.