Very Rough, Low Idle and Missing - Help!, 73 D-Jet - SOLVED! Options

[ThinAir]

RRC is only a couple of weeks away and I'm beginning to get desperate that I'm not going to be able to drive my 914.

When I posted this, my problem was just that the idle would hunt, but otherwise it drove well. After reading the responses and reviewing Brad Anders' stuff again it made sense that my hunting problem was probably that I was just running lean. I turned the ECU 3 clicks clockwise to see if that would improve things, but it didn't seem to.

Well, things have gone from poor to bad. Right now I've got a car that barely idles at all, and when I'm accelerating or driving on the highway it often bucks/misfires. I haven't run it long enough to get it warmed up. I've tested the AAR by pulling the supply hose and it seems to be working. If I remove the AAR output hose the RPMs go up to 1000 so perhaps the AAR isn't opening fully.

I've measured the ohms on the CHT at 124 so that's within range, and I've got a brand new 270 ohm resistor inline. I have 3 MPS units that all pass on resistance and vacuum and changing them makes no difference in the behavior. I've also recently replaced the spark plug wires (not to solve this problem, but just because) and I've made sure that they are as far away as possible from the MPS unit. I've also checked every electrical connection that I can find.

Sorry that all that is so long - any clue what I should be looking at? I'm beginning to panic (IMG:style_emoticons/default/blink.gif)

[hot_shoe914]

Check the points to while you are at it.

[DRPHIL914]

Check the points to while you are at it.

(IMG:style_emoticons/default/agree.gif)

the hunting could still be a lean issue , i have had 3 mps that "tested" o.k. but were actually causing a lean running issue- adjusted the MPS and it was gone, but it sounds more like your points or the injector trigger points plate may need replaced or cleaning too. I would check your grounds for the FI harness. mine was loose and acted just like you are describing. i had 3 issues going on - needed new fi harness that i got from jeff bowlsby, new injector trigger points plate, and put new points(later went to petronix) since then i tuned the MPS and the timing an now all is well. --

1- check plugs r they white(too lean,hot), black and sooty(too rich)
2. points dwell and timing - when did you set the valves last?
3. wires and fi grounds ar tight
4. if you have an MPS that the epoxy plug is removed you can adjust this per anders site direction ---- mine took one full turn to be the correct richness and A/F ration (i have a gauge) - - and i had it pre set by a member to be set to factory setting, prior

good luck and keep us posted