Idling high, 1100-1200 rpm Options

[6gsillyca]

Alright, so after finally getting a bunch of piping back from powdercoating, I was able to put everything back together, and start it up for the first time since putting it away for the winter last season.

Things I did during the winter:

swapped out the 540's for stock 440's
swapped out "possible chipped" JDM 93 ECU for 91/92 USDM ECU (both for SW20)
new plugs, ign wires, coil wire, cap, rotor
powdercoated valve cover, new VC gasket
powdercoated TB bracket, everything up until IM was removed
new (rebuilt) HO alt (120+ AMP)
new pass cv axle
deleted metal "plate" that runs behind fuel rail with vac line for FPR. Now running vac line routed behind engine, tucked along firewall.
throttle cable is NOT adjusted properly, since I can't get it to idle properly

I started the car up and it runs, but very rough. It will almost die, then shoot up to ~2k, then cycle back down to >400rpm, and almost die again. Goes through this cycle, and each cycle is maybe 10 sec long. Exhaust is not overly fuel rich (not much carbon splatter either), but it is spitting liquid. I don't know what it is, but it is very watery, no gasoline smell, and is a light black color.


Another thing I did notice with the new (91/92 USDM MR2 ECU) is that I now have a CEL. I was not able to get it to light up with my old JDM ECU. I was also able to pull 2 codes. 21 and 51.

Will look into the CEL codes, but it was running good when she went away last year...




EDIT:
Got it to idle good now. Turned out to be a missing FR insualtor, giving me a big air leak. Fixed it up now and it idles good, but high. 1100-1200. Any idea's?

This post has been edited by 6gsillyca: Jun 5, 2008 - 3:30 PM

[6gsillyca]

I looked into them aswell and got the same reasons, o2 sensor and switching valve, most likely ac idle up. These codes, AFAIK, are "monitored" codes, and should not affect how the engine runs (as far as my situation is concerned).

bad o2 will give me bad mpg, but shouldn't affect my idle that much (idle = closed loop = no o2 sensor input), and AC idle up, shouldn't affect my idle if my AC is not running. My o2 sensor IS plugged in, but I have a new one ordered.

However I did find a big boost leak and a missing vac line last night. Boost leak is either between TB > TB bracket, or TB bracket > TB inlet, as I had both the inlet and bracket powdercoated, so I will make a gasket for both and see if that helps. My missing vac line was the one that runs from the TB to the nipple on the valve cover. I forgot to reinstall it after I redid my valve cover.


What are the 2 nipples on the TB for? The front one looks like it runs to the EGR/charcoal canister, but the 2nd one is capped. What would it have been for.

This post has been edited by 6gsillyca: May 29, 2008 - 10:58 AM