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Old 04-30-2010, 02:43 PM   #1 (permalink)
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97 E420 Shutting off

Hi. My 97 E420 just started shutting off when at a stop. I actually had check engine codes, and replaced 2 ignition coils, but as soon as I did, it started stopping and the battery charge and asr lights came on. I took the battery to Autozone to test, and they said it was bad, and I replaced it. I didn't think it was the battery anyway. I opened the hood and I see I need to replace the serpentine belt, but I think it's the alternator. Just trying to see if that's what you all think. It seems like it only shuts off when the temp get around 100, so maybe it's a pump or something? I don't know. Thanks in advance for your help.
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Old 04-30-2010, 04:46 PM   #2 (permalink)
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I fail to see the cause and effect relationship between changing the ignition coils and your more recent symptoms. Ignoring those for the moment, a successful cold start and a stall once the engine is hot sounds like your crankshaft position sensor. There are several threads discussing these. Does it start again after a 10-15 minute cool down period?
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Old 04-30-2010, 06:28 PM   #3 (permalink)
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Oh, I wasn't trying to connect the two, just that it happened right after the other. The engine starts back up immediately. I replaced the camshaft position sensor a little less than a year ago, so I hope that isnt it. It also feels like it drains energy when I use the windows or the A/C, and today when I was driving, low speed, it felt like it wanted to stall, you know, rpms surging. Also, there's no check engine light on, I believe it was on when I replaced the position sensor. Thanks again.

I did a little more reading, sorry, I see there's a difference between the two. I'm ordering a crank position sensor now. Thanks

Last edited by crownluv; 04-30-2010 at 07:00 PM. Reason: more info
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Old 04-30-2010, 07:17 PM   #4 (permalink)
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The abbreviations are confusing. CPS should always mean camshaft and KPS crankshaft. From what I've read the KPS is by far the more commion failure.

If you notice a current drain when using windows or A/C I think you might be spot on regarding the alternator diagnosis. That is if you have the proper battery installed correctly.

Last edited by Musikmann; 05-01-2010 at 06:59 PM.
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Old 04-30-2010, 08:57 PM   #5 (permalink)
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Well...

I am in agreement with M-Man, you may have a couple of things going on.

Check the stickies under CPS sensor replacement..if you are saying this was changed about 1 year ago, if that was not the OE part but non-mname equivalent your current failure would be right about on schedule. The OE part will go out another 100K. A CPS that is failing will cause the car to shut down like a cut off switch, often coming to a stop, and also commonly cause start up problems when warm. These problems happen more and more often as the CPS progressively fails.

If it feels your engine is "cking" coming to a braked stop, and the RPM's drop like it's going to die, but catches itself..and progressively gets worse, then that could be a sysmptom from a failing MAF.. you have to watch out for a LOT of knock off and rip off low prices internet MAF's, if you go to replace buy from a reputable source like oft mentioned vendors here on this forum like autohausaz.com

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Old 05-10-2010, 07:13 AM   #6 (permalink)
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Ok..I replaced the KPS, and I'm still having the same problem..when the temp guage get around 80-100, it shuts off at stops. I have to keep my foot on both gas & brake, and it still feels like it's trying to shut off. And when it does, the ASR and battery lights come on.

So, do I go to the MAF next, or are there any other ideas? Thanks in advance.
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Old 05-10-2010, 08:26 AM   #7 (permalink)
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you mentioned pulling the error codes. what were they?
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Old 05-10-2010, 08:33 AM   #8 (permalink)
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No error codes are coming up. The last code I got was for the cylinder 3 ignition coil, which I guess is unrelated. When it stalls, the ARS and battery light come on, but that's all.
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Old 05-10-2010, 11:54 AM   #9 (permalink)
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The lights that come on when it stalls are typical since voltage drops, so ignore that.

There is no such thing as a code for an ignition coil; I have no idea what you mean.

What *exactly* are you doing to check for codes?
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Old 05-10-2010, 03:15 PM   #10 (permalink)
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The code was P0303 - Cylinder 3 misfire. I changed the ignition coil and it went away..I don't think it is related to the issue I'm having now. I check for codes at Autozone, but there is no CEL on, so I haven't checked for anything since the P0303 code was cleared a couple weeks ago.
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