H2 Idles too low

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H2 Idles too low

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H2 Idles too low - 11/12/2007 12:04:41 PM

warren86

Posts: 23
Joined: 11/12/2007
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I just swapped my stock battery for an Optima yellow top and now it won't idle above 400 rpm. I put the stock one back in and same thing. It starts very hard too. I drove around a little and it stalled a few times when I came to a stop.

Any feedback would be great.

Thanks,
Jim

Post #: 1

RE: H2 Idles too low - 11/12/2007 12:08:25 PM

shortbus

Posts: 3602
Joined: 6/27/2005
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that's a bit odd. is your check engine light on? the only thing i can think of is that maybe something got shorted and toasted or reset the PCM. do you have a code reader, or access to one? it would be interesting to see what, if any, codes you've got. if you can get the codes and post them, i can at least tell you what they're from. the battery won't have anything to do with idle, so it has to be something that reset or got shorted during the swap. did you connect the hot side before the ground, or the other way around?

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Post #: 2

RE: H2 Idles too low - 11/12/2007 12:11:22 PM

Muddydawg75

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From: South Jersey Shore
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Interesting.... Have to go with shorty.... disconnect the leads again.... wait the few minutes.... connect the POS and then the NEG.... and try it again....

if you are gonna get codes it will take a few cycles before the CEI comes on.... since you just did the battery...

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RE: H2 Idles too low - 11/12/2007 12:24:56 PM

warren86

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Joined: 11/12/2007
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The check engine light is not so will it still give me a code? I did do Pos. first then Neg. and I just let it sit for about 30mins with the cables disconnected. It seams to start a little easier now, but still idls low.

Jim

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Post #: 4

RE: H2 Idles too low - 11/12/2007 12:32:00 PM

shortbus

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Joined: 6/27/2005
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if the starting is coming back to normal, it may just have to relearn everything. it's possible that you simply wiped out memory and it will come back over time. once you reconnect it start it up and tool around the neighborhood some - but not too far in case you have to walk. the codes will throw after a set number of ignition cycles, it just depends on the issue. they also clear themselves after another set of ignition cycles if the problem disappers, but that takes longer. hopefully it's just "relearning" the mix and idle settings, so you'll come back to normal. if the problem was the same with both batteries, i would go ahead and put the yellow top back in, since that doesn't seem to be the problem. but that's just me and i still have warranty left. . . . . let us know what happens.

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Post #: 5

RE: H2 Idles too low - 11/12/2007 12:32:56 PM

Muddydawg75

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I think it takes 6-10 cycles for a code.... so if you just did the batteries again it might take a couple days...

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RE: H2 Idles too low - 11/12/2007 12:35:55 PM

warren86

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Joined: 11/12/2007
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Thanks for the advice. I'll try driving it around a bit and see what happens.

Jim

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Post #: 7

RE: H2 Idles too low - 11/13/2007 3:54:45 PM

Muddydawg75

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What did you decide, Jim?? Is it better?

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RE: H2 Idles too low - 11/13/2007 5:02:27 PM

warren86

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It seems to be doing ok as of today. It appears to idle at 600 rpm which seems a little low, but im not sure what it's suppose to be. I'm just glad it's not dying at the stop lights.

Jim

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RE: H2 Idles too low - 11/13/2007 8:47:31 PM

dizzy

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Does anyone know what proper idle speed is? My 03 H2 idles around 600 without issues.

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Post #: 10

RE: H2 Idles too low - 11/14/2007 7:40:07 AM

shortbus

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mine's always idled between 500 and 600. not sure i'd want it any faster, i'd have to fill up between red lights. glad to hear it's doing well, but keep your ears open and watch the gauges. did you ever get a chance to see if you had thrown any engine codes? would be interesting to know what, if any, popped up.

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Post #: 11

RE: H2 Idles too low - 11/14/2007 3:24:12 PM

warren86

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Joined: 11/12/2007
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Seems to be running fine now. I never had a check engine light and I don't have a code reader. I think maybe it had something to do with using my remote start and not starting it with the key after changing the battery. I still need to put the optima back in.

Jim

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Post #: 12

RE: H2 Idles too low - 11/14/2007 3:45:54 PM

Muddydawg75

Posts: 9955
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From: South Jersey Shore
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Let us know....

BTW... mine is at 600 also.... I'll check the next time I have the hood open if it has the idle speed on the sticker under the hood...

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Post #: 13