Actually need help

[mike95125]

I just got my teener running (Thanks to KdFoust, red-beard, and sean_V8) and after paying meticulous attention to potential vacuume leaks my idle still hunts all over the place.
I need a laundry list to check so feel free to submit.

More precisely: when not idling all is well. If given gas when I eventually get it to calm down (1000-1200 rpm) it starts to go up and down after almost dying.
Could it be the throttle position sensor adjustment?
Brad, you out there?
I am one step away from dependable. My girlfriend is even not scared of it (the car) any more.
TIA

[Jim Smolka]

"I am one step away from dependable"

Us car guys are never dependable, especially guys who like to work on their own 914s .

Check the Aux Air Valve

[RonF]

I had that trouble, with my 73 1.7 .
2 of the injectors seemed to be kind of missing.
I found a little bit of oil on the trigger points, after cleaning and retiming and setting the idle pot back a few spaces it seemed to be good.

[HMeeder]

We'll get it figured out.

287-6425

[John Rogers]

If I remember correctly, an idle hunt is caused by an overly lean condition and that usually means vac leaks? If this is a 2l or even a 1.7 I might be able to bring the tools and such over this weekend to see what we can figure out. I use the FI troubleshooting document and go through it all and usually the problem will be solved. Let me know if you'd like some help? We just had a tranny party I guess we can have a "hunting party"?????

[mike95125]

You guys are the bomb! I am going to AJ-USA to get it alligned tomarrow. I'll probably be working on it this weekend, and all are welcome. I kind of did some research, and got some ideas, but I am not 100% its any of them. Guess I'll have to see.
Herb, John I'll prolly be talking to you this weekend.
Thanks again, I am very lucky.
<> Haha

[jkeyzer]

Mike -

I might be able to help you figure this out. I just got laid off 2 weeks ago so right now I have a lot of time on my hands. Let me know if you want me to come by and help you work on it. I know a lot of the basic checks and might be able to lend you a hand.

[kellzey]

I like the title of your post.

"actually" need help!

What? YOU!!! YOU need help? I can't believe it! Of all people, YOU need help. Who are you... Brad Roberts or something?

Just kidding!

Hope you fix your problems.

[Bleyseng]

First, re time the car to 27 degrees BTDC using a timing light. Check the fan marks to make sure they are right.
second, check the vacuum hose routing to make sure its right.
Third, are you using the correct CHT and the ballast for a 73 2.0L with the 037 ECU and 037 MPS. If not you will be chasing the idle problem for ever.
Geoff

[norustscott]

I second Geoff's comments. I have a 73 2.0l with missmatched FI parts. Actually only one. the 043(9?) MPS with a 13X ecu....everything else is 73 spec.

My idle will hunt from 850 to 1500. not alot of up and down it just has different idle points after running with an open throttle...depending on the temperature of the engine adn I guess the amount of vacuum. Also, I can be idling @ 1200, too high an annoying, and simply turn off the engine and restart to get the engine to idle down to 850.

This is just the way it is until I can find a decent 037 MPS...

Without the right mix of 73 parts you are going to have an idle problem. BTW I replaced my ballast resistor, the Wherle 270 ohm with a variable pot. I have dialed in just a tad more than 270 ohms, 296 to be exact, to correct most of the up and down idle. Seat of the pants experiment, yes, but it did correct the hunting.

[mike95125]

I actually am running a 76 2.0 that has been de smogged. I did so because of the problems with getting parts, and it was the only available one at the time. Other wise Geoff, and Scott would be right on, Im sure.

Jeff you are welcome to come and hang out any time, sorry to hear about your job situation.

Karl, the "actually" comes from it actually being together enough, and running to need help in the last step. Brad Roberts....;p I get it.
Thanks again fellas.

[Bruce Allert]

Originally posted by norustscott
My idle will hunt from 850 to 1500. not alot of up and down it just has different idle points after running with an open throttle...depending on the temperature of the engine adn I guess the amount of vacuum. Also, I can be idling @ 1200, too high an annoying, and simply turn off the engine and restart to get the engine to idle down to 850.

THAT is exactly what mine does and that's what I do... re start & most of the time it idles right.
Thanks Mr. Norustscott
bruce

[norustscott]

I think it must have something to do with the MPS. More vacuum related problems...Mine is intermittant. Sometimes the idle is slightly high. Other times it is dead on. Still, if it is high, turn of the engine and refire and 8 times out of ten it wil lower the idle.

Anybod want to trade a very new 74 and up MPS for a 037 MPS ( a working one)

[Bleyseng]

I can re calibrate it for you or send it to Jeff Bowlsby for the same.
I like to spec them a little richer for more HP and test them on a friends 73 2.0L to make sure they run right.
I have sold out of MPS's at the moment and trying to find good cores is hard. I have to hit all the swap meets and junkyards when I have time.
The other way to go is to install the Megasquirt EFI and junk the djet. We (the 914 guys) have almost got this dialed in.
Geoff

[Otto]

Set the C.O....

[chrisreale]

Originally posted by Otto
Set the C.O....

Could you elaborate on this? I dont understand what items in a D-Jet system are adjustable to get a good C.O. AFAIK, if you have all the matching componenets, and all are in working order, you will have the right CO right?

[jkeyzer]

The idle mixture can be adjusted for one.

[red-beard]

Mike - James has a CO meter....

James

[Bleyseng]

To adjust the CO you play with the ECU knob and the air bleed screw. If the idle is very unstable you need to fix something else first then adjust the CO to set the idle.
Geoff

[mike95125]

Geoff hit it on the head. I figure that something else is crapped on it that will need my attention first.
Oy Veigh!