service engine light is on in my 84 deville???

Reply Subscribe

Thread Tools

Search this Thread

10-13-2007, 12:26 PM

smoney4

Thread Starter

Join Date: Oct 2007

Posts: 2

service engine light is on in my 84 deville???

ok so i went to a mechanic and he tole me its my "clear aux fan lean mix emission" and i have no idea what that is, any ideas on what it is or how i can fix it?

10-13-2007, 04:29 PM

slowroll

Tech Certified Members

Join Date: Oct 2007

Location: in the mitten

Posts: 3,160

RE: service engine light is on in my 84 deville???

?????????? What code is in it?

10-14-2007, 11:25 AM

smoney4

Thread Starter

Join Date: Oct 2007

Posts: 2

RE: service engine light is on in my 84 deville???

to24,55,67,7.0 this is the code i have...

10-14-2007, 01:42 PM

slowroll

Tech Certified Members

Join Date: Oct 2007

Location: in the mitten

Posts: 3,160

RE: service engine light is on in my 84 deville???

24 vehicle speed sensor, does speedometer work? 55 prom error, prom / chip missing or damaged or ecm.67 not sure I think it is a switch code. 55 is the one to be concerned about. Check grounds first , they are on intake and passenger side head.Hope it helps

10-14-2007, 02:53 PM

brougham1

Tech Certified Members

Join Date: Jul 2006

Posts: 424

RE: service engine light is on in my 84 deville???

Hey there Smoney: On the CCC system the 55 code a number of things but slowroll is right that's the one to be concerned about. It can be faulty oxygen sensor circuit , faulty ECM, grounded supply terminal 19 0n ECM, grounded reference terminal 21 on ECM. I think the 67 is the cruise control circuit.