The CEL has been cycling on and off of my '06 Kia Sedona for a good month now. It's been running fine. I finally got the chance to take it to Autozone over the weekend to pull the codes down. Yeah, I know, what took me so long? I don't drive it much and just haven't gotten around to it. Anyhow, it had 3 different codes. I forgot to bring them here with me, but they basically all were saying the same thing. They're saying that at idle, the engine is running lean. There was one code for each cylinder bank, and I forget what the other was, but it was related to running lean.
Of course, it lists a whole host of "potential causes", but they're very vague. Any thoughts on what would cause both cylinder banks to run lean at idle? The van seems to run and drive perfectly fine, so I don't notice anything obvious.
Both banks lean is going to be a split pcv or intake hose, or a slightly out of range maf, or a weak fuel pump, etc. Start by looking at air hoses.
If we had the codes, we might be able to get closer to the problem.
iceracer wrote:
If we had the codes, we might be able to get closer to the problem.
Yeah, I feel dumb for not having them with me. They're on a print out at home. I'll grab them tonight.
OK, so here are the codes that we pulled down.
P2187 - System too lean at idle bank 1
P2189 - System too lean at idle bank 2
P0174 - Bank 2 system too lean
Of course, it gives a whole host of "probable cause" items. Large vacuum leak, fuel system fault, ignition system malfunction, engine mechancial fault. But those are very broad reaching. Trying to figure out where to look first.
Look for a vacuum hose hanging loose?
If you don't have an increased idle speed, I would check the fuel pressure. I have seen where the pump drops pressure, PCM increases PW, and nothing changes, which just gets you a MIL.
Run some fuel system cleaner through it. Could be dirty/sticky injectors.
temperature sensors can cause a lean condition.
Since the problem is only at idle, I don't see fuel pressure being the problem. But it still should be checked.
Dirty MAF or poor MAP readings are suspect.
Do a thorough visual check to look for anything amiss.
Always a good idea to check the grounds.
