redlinevtec
Well-Known Member
A bad idle control valve doesnt always proceeed with a check engine light. But it should eventually. The brake booster is the black round looking thing right behind the master brake cylinder. There is a hose going from that to the trottle body, you can disconnect that guy and feed seafoam through there.
There will be a lot of white smoke.
How low does your idle go anyways? are we talking below 500 rpms?
I have one more question, was your car originally ULEV ENGINE? If so, your O2 sensors are wide band and its not compatable with the normal F23 engine. You may need to look into that as well.
Yeah, I figured out where the master brake booster line was the day you asked me if I ever Seafoamed. My buddy and I both used Seafoam on our cars in a parking lot. Let it sit for 10-15 minutes and let it rip. All came out pretty quick. I got a CEL, reset it, and never came back on. I scrubbed my intake manifold pretty good so I think the Seafoam had little effect.
My idle is pretty much at the bottom when I shift into gear. At idle in Neutral or Park, it sits around 780ish. Maybe 800, a little high if you ask me. I would decrease my idle but if I did I'm afraid I would stall. And I would increase my idle but that made the car shake more violently in gear at idle and my MPG's went to poop. Cleaning out the whole intake system made a significant improvement. I don't stall when shifting from Neutral to D4 at a stop light anymore and the idle is about 40% difference. Imagine how quiet it will be once I fix this problem?
So to answer your question, my idle is below 500 sometimes. It's really damn low. Then I think the IACV tries to bring it back up.
That's a good question about ULEV. No my car is a stock F23A1. 98 Honda Accord LX. Checked the VIN, no ULEV or SULEV. Stock. I don't think ULEV engines came out the first year. I think in 99 they did. Not sure. But no, regular F23A1 Vtec engine.
Any other ideas? I'm going to swap IACV's, throttle bodies & egr valves with my buddy this week. I'm not going to get my hopes up high. But we'll just have to see. I do have a lack in power, and like I said earlier when I first pull down on the throttle cable in the engine bay, there is a delay. Second time there is no delay. Maybe it is the TPS OR ECU. We'll just have to see...
Stupid car...
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