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Old 01-18-2009, 10:52 PM
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Join Date: Apr 2006
Location: Latham, NY
Posts: 20
300CE checked codes now running hot?

Hi everybody,
my 93 300CE has 160,000 miles and has been running fine other than a slightly slow idle (550 in gear) and the fuel mileage dropping off to about 19 combined highway and city. The plugs and connectors have about 30,000 on them and the O2S 1 was replaced a couple of years ago. As far as I can tell the engine wiring harness is original, but looks OK. The previous owner had the head gasket changed, but couldn't tell me about the harness.

About two weeks ago the CE came on and showed code 5. I searched here and read about the plugged EGR tube and port, broken vacuum lines, etc. I also built the code reader and PIN 8 codes 2, 5 and 11 showed up (what a great little tool, thanks!).

I found a couple of vacuum lines that were suspect and replaced the rubber ends. The EGR is pretty rusty and doesn't show any paint dots. When I apply vacuum to the EGR, the engine stumbles a little, but doesn't stall. I don't hear it snap shut if released quickly. I put a vacuum gauge on the line into the EGR and it shows nothing at idle but responds on engine revs. I didn't get into checking the EGR tube, The bolts wouldn't budge and I didn't want to break anything, so I started soaking them.

I cleared the emissions code 5, but didn't have any luck clearing the others. The CE is out now and the car runs great other than the idle is still a little slow and uneven. If I just rest my foot on the gas pedal, it's fine. Does this combination of PIN 8 codes point to anything or are they maybe left over from something else?

Now for the weird thing. It has been 0-15 degrees here and ever since I checked things the car starts to heat up idling for just a couple of minutes in traffic. It normally runs around 80 degrees and now it starts creeping up to the next mark if I sit at all. What the heck could I have done? Or does it have something to do with the code 2 and I disturbed something?

One other thing I have found questions about, but no real answers, when the key was on (engine off) checking the codes, there was a very load whining motor noise from low on the drivers side of the engine. I felt around and couldn't find anything, but it didn't sound good.

Any ideas please.

Thanks guys,


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Old 01-20-2009, 09:08 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Nothing you have done would cause the engine to run warmer. Most likely you need a new thermostat.

The throttle actuator can cause that type of noise.

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