JeremyR
08-26-2008, 08:58 PM
Greetings,
I've been lurking around 3geez for a while--it was here that I was inspired to install a cold air intake into my `87 Accord LX-i (A20A3), being the tinkerer that I am.
Well, unfortunately it seems that I'm not that good of a tinkerer, as I turned a perfectly working engine into, well, let's just say that it could be doing better. After reconnecting numerous vacuum lines (using a handful of tee fittings since the stock intake plumbing has a number of vacuum nipples that the CAI doesn't), I'm not able to get the idle quite right. I'm pretty sure I don't have any vacuum leaks, although I can't rule that out entirely.
In the process of tinkering, I've actually been able to get the idle close to where it should be: in Park or Neutral (did I mention this is an automatic transmission?) with the A/C on, idle is just under 1000 RPM; with the transmission in gear (A/C on or off) it's around 800. In Park with A/C off, it's around 1200, sometimes closer to 1500 (which is a bit high). But I should mention that I've only been able to do this when vacuum lines 17 and 18 (which lead to the "black box") are disconnected. When they are connected, the engine stalls when the A/C is engaged and/or the transmission is put into gear.
I should further point out that the transmission doesn't even have to be put into gear--if the lever is nudged slowly, the engine stalls well before the gear would have been engaged, as if some maladjusted idle control were kicking in. Also, while I'm thinking about it--what I believe is the A/C idle adjust screw doesn't seem to have any effect on engine idle.
This doesn't seem to be normal behavior after swapping out the intake plumbing, or I would guess I'd have read about it somewhere. Since I haven't, I wonder if I've done something wrong? Is there anything I should specifically look at? (Perhaps not all lines leading to the stock intake are vacuum lines?)
Cheers,
Jeremy
I've been lurking around 3geez for a while--it was here that I was inspired to install a cold air intake into my `87 Accord LX-i (A20A3), being the tinkerer that I am.
Well, unfortunately it seems that I'm not that good of a tinkerer, as I turned a perfectly working engine into, well, let's just say that it could be doing better. After reconnecting numerous vacuum lines (using a handful of tee fittings since the stock intake plumbing has a number of vacuum nipples that the CAI doesn't), I'm not able to get the idle quite right. I'm pretty sure I don't have any vacuum leaks, although I can't rule that out entirely.
In the process of tinkering, I've actually been able to get the idle close to where it should be: in Park or Neutral (did I mention this is an automatic transmission?) with the A/C on, idle is just under 1000 RPM; with the transmission in gear (A/C on or off) it's around 800. In Park with A/C off, it's around 1200, sometimes closer to 1500 (which is a bit high). But I should mention that I've only been able to do this when vacuum lines 17 and 18 (which lead to the "black box") are disconnected. When they are connected, the engine stalls when the A/C is engaged and/or the transmission is put into gear.
I should further point out that the transmission doesn't even have to be put into gear--if the lever is nudged slowly, the engine stalls well before the gear would have been engaged, as if some maladjusted idle control were kicking in. Also, while I'm thinking about it--what I believe is the A/C idle adjust screw doesn't seem to have any effect on engine idle.
This doesn't seem to be normal behavior after swapping out the intake plumbing, or I would guess I'd have read about it somewhere. Since I haven't, I wonder if I've done something wrong? Is there anything I should specifically look at? (Perhaps not all lines leading to the stock intake are vacuum lines?)
Cheers,
Jeremy