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88 Sedan Deville, 89 Eldorado, 11 SRX, 18 CT6
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130 Posts
hey there! i have an 88 deville, 4.5 V8. ask any questions.... to get the codes....
turn ignition to ON position. on climate control, hold OFF and WARMER untill ur dash lites up, service soon and service now, as well as various other things, then every LED on the climate control and fuel data center light up. it will read codes in E,EE, F, FF, then 70. 70 means ready for more tests, etc. theres a whole world of tricks and menu's in there, you just need to know how to read it. post all the E and F codes bakc here and i'll tell you what they mean.

or, email me [email protected] for a much much faster response. thanks, phil.

ps- keep that 88 running!!! mine's got 175,000 on it :)
 

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my list of codes only goes up to f 51 but maybe i dont have complete list but if it was i typo and u ment E 85 that is Idle Throttle Angle Too High
 

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88 Sedan Deville, 89 Eldorado, 11 SRX, 18 CT6
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130 Posts
the 90 uses diffrent diag codes. your prom is also not the same. the 88 deville goes up to F10-F51 E12 to E67 make sure all the LED's light up properly. you may be mis-reading due to an inop light therefore a 7 could look like a 1 without a light in the right place.
 
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