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SES vs Cold Weather

936 views 3 replies 2 participants last post by  Diny 
#1 ·
I have had an SES light that stays on just about all the time. At first it indicated a crankshaft position sensor. I reset it and that code never returned. I do get a misfire on #4 and a couple of others. The car runs fine.
I was going to get it into the shop when a cold spell hit. The temps went below 20 degrees for a couple of days. I drove the car - no SES light.
I refilled the gas - SES light comes on. (I do close the cap tightly until it clicks.)
Light stays on for a couple of days. Temps get cold again - light goes out. I drive it then fill the gas, light comes back on.
Cold weather below 20 degrees. Light goes out.

I use Citgo, Hess, sometimes Mobil (all 93 0ctane). It does not seem gas dependent, but below 20 degrees and gas refill dependent. Kind of strange. Any thoughts?

Thanks.
 
#2 ·
When the light keeps coming back, what codes do you get?

I recently left the car out during an ice storm and when I started it the next day, it seemed rough as hell. No SES light, but I checked the codes anyways: Over 8 misfire on warm-up codes. I reset them and they havent come back since. Then again, I havent left the car out.
 
#3 · (Edited)
The weather warmed up and the SES light came back on. I have a Bavauto reader which I am told is the same as the Peake. I am a neophyte with this thing so I am not totally sure which chart I am supposed to reference.
This is what I get:
18 - Ignition coil #4
06 - FI Unknown
A2 - Crankshaft / Camshaft correlation, Cyl 5-8
72 - Exhaust camshaft VANOS position control 5-8
69 - (There are more than one 69 entries for the code charts. I will check this out.) ECU and DME EEPROM Failure
C4 - EVAP electrical LDP valve
Cd - ( I can't find this one in the book)

Prior to this last SES light, I got 18, 06, A2 and 72. The other ones are new.

This is the link to the code book: http://www.bavauto.com/Assets/inst_pages/sr300.pdf

Probably time to bring it in to the shop.
Thanks.
 
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