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Old 07-01-2006, 12:37   #1 (permalink)
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eek Weird CEL thing..

I have an OBD 1 reader for my 94 merc, but lost the paperwork for it. I'm still looking and will try to download the book from the web.
In the meantime, I have a CEL that only comes on at NIGHT. In the daytime, I can run with the lights on/off, the heater on, then AC, 75mph for hours, doesn't matter, the CEl stays off.
But, on the way home from work about 2 am, after about 15 mins of running down the highway, the CEL comes on and stays on until I turn the car off and restart, then about 15 minutes later, it's back. Next day, in the daylight, no CEL all day. When the light comes on, there is no noticable affect on my performance, car still runs great.

So, I'm thinking some sensor in the emissions system is struggling with the cooler, damp air at night. Opinions anyone?
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Old 07-02-2006, 00:07   #2 (permalink)
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Re: Weird CEL thing..

I can't figure out your problem, but that's an awesome George Carlin avatar.
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Old 07-02-2006, 18:34   #3 (permalink)
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Re: Weird CEL thing..

Thnaks, I've loved listening to Carlin since the late 70's and his "Toledo Window Box" album.

I don't expect anyone to diagnose the problem based on my post. I was hoping someone trolling around here might have had the same thing happen to them and know the fix. Oh, it did it in the daytime for the first time yesterday, but guess what? It happened while driving through a rainstorm. I now I'm pretty sure it is an air sensor of some type that gets out of specs when the air pressure is different or when the air is moist.
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Old 07-06-2006, 23:54   #4 (permalink)
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Re: Weird CEL thing..

Bump. Anybody encountered this?
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Old 07-10-2006, 20:41   #5 (permalink)
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Re: Weird CEL thing..

Unhook your negative battery cable for 5 minutes and then hook it back up and drive normally,if it comes back on then go to autozone and get the free diagnostic check. See what happens after that.
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Old 07-11-2006, 13:54   #6 (permalink)
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Re: Weird CEL thing..

Thanks man, but the AutoZone guy told me that they only do OBD II, as mine is a 94, he couldn't help. I've got a bigger problem now. Rain soaked dirt road had a cat snot section with big ruts. I tried to skirt the ruts but slipped in and bottomed out. The next day, big puddle of fluid under the car and steady stream pouring out with the engine running. I'm jacking it up today to find out where and what. I hope it's just an oil or tranny pan. If a main seal let go, I'm gonna be majorly bummed out.
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Old 07-11-2006, 22:05   #7 (permalink)
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Re: Weird CEL thing..

Its probably just the pan on one or the other,but, don't run it until you see for sure. I seriously doubt that it is the seal.Mine is a 92 and they check mine. Get you a Haynes manual and do it yourself,it gives the codes and tells you how to check without a scanner. I use a jumper wire and count the flashes on the CEL to get my info.The manual also tells how to reset the computer after the codes are retrieved. Bottom line is get a Haynes manual from Autozone and do the work yourself.It's well worth the $20.Good Luck
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Old 07-12-2006, 13:38   #8 (permalink)
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biggrin Re: Weird CEL thing..

Thanks. Hey, good news (for once). The leak was the lower trans line as it passes thru next to the oil pan on the way to the radiator. It had been rubbing on the cnter suspension assembly for some time, and holes finally resulted. I called NAPA and they didn't even list a new line, so i assume it's a dealer only thing. So, I yanked it out, cut out the bad section, and put in a section of reinforced rubber hose with serious hose clamps and stuck it back in there. Viola, no more leak.

I have a haynes manual for every vehicle I own, except the Merc. rest assured I'll get one for the new baby. I find that haynes leaves some stuff out, and is a little confusing, but the chiltons books leave more out, so I settled on the haynes. I've got an OBD 1 reader, and I found the instructions for it, so I'll be pulling that code soon. Thanks again.
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