AAR and High Idle Options

[lsintampa]

75 2.0 FI w/backdated exhaust

Motor recently rebuilt.

Injectors cleaned / all are very good. New points, condenser, blah blah. Most everything is new .... except:

FI parts were all just laying about for IDK, maybe 10 - 15 years or so.

Car DID have A/C - but not any more.

The shop that did the motor rebuild did a great job, but they didn't sign up to muck with the FI system. They did a great job on the rebuild and did as much as needed to get the car running, but left the FI tweaking for me.

Which is fine - assuming I can tackle it myself, or (if not) farm it back out. I asked for the option.

That said, I notice that the hose that goes to the IN port of the AAR (the larger of the two hoses), gets sucked closed when the car is running. By that I mean the suction is so great it basically collapses the hose (pinching it).

I haven't had the time (wife just got out of some surgery yesterday) to play with it, but I'll pull that hose and replace it with something a bit more sturdy.

I don't know what effect that would have on the idle - if any.

Idle is a bit high, in the neighborhood of 1100 (more or less at times). Depends if I just am sitting or came to a rolling stop, etc. But mostly let's call it 1100. The car is very responsive and runs strongly. No issues there.

I don't have access to any high end diag equipment, so most of what I can do would be try this - see if it helps. I do have vacuum gauge, timing light, basic stuff.

I'm wondering if (since the car did have A/C), somewhere in the past if some adjustments were made to the FI system to account for the extra strain the compressor and pulley added to the motor? (resulting now in a high idle) I think they (the shop) did all they could without mucking with components. Adjusting throttle cable, air valve, etc.

So, what effect on the idle would the AAR intake hose collapsing on itself have?

Should the suction be that strong to cause the hose to collapse? (I think the hose is one that came from the AA FI hose kit).

I think it makes sense to first address the AAR hose situation before moving onto the idle issue, just don't know if they are related or not??

Thanks,

Len

[Dave_Darling]

Those are supports for the plenum; they run from the roof to the floor of it so it does not squish when weight is put on it. They can be open at the ends, but they should not let air into the plenum. The welds (??) around them that attach them to the roof and floor of the plenum seem to crack with some frequency after four or five decades, so it is worth checking those for leaks.

--DD

[Bartlett 914]

Those are supports for the plenum; they run from the roof to the floor of it so it does not squish when weight is put on it. They can be open at the ends, but they should not let air into the plenum. The welds (??) around them that attach them to the roof and floor of the plenum seem to crack with some frequency after four or five decades, so it is worth checking those for leaks.

--DD

(IMG:style_emoticons/default/agree.gif)

These can be a source of a vacuum leak. There is a lot of weight and vibration that can cause the welds to crack