error code E30 need help

i was out crusin this last weekend got pulled over by the highpow lol and before i left i fugered might as well check the codes while i was stoped and E30 came up along with E28 i know that one allready could the E28 through the E30 or are they seperate probs     thnx brick

How fast were you going? I am seeing RPM Out of Range. Did you actaully red line the Deville? WTF?

E30=Idle Speed Control Circuit Problem.  Some switch is out of adjustment:  TPS/Power Steering Sw/park or neutral safety sw.  Out of adjustment minimum air rate, ISC/TPS can cause ISC not to control idle.  E30 could also be a false code  Long diagnostic 'tree' to follow.....  

quote:

ORIGINAL: Dave S Texas

E30=Idle Speed Control Circuit Problem.  Some switch is out of adjustment:  TPS/Power Steering Sw/park or neutral safety sw.  Out of adjustment minimum air rate, ISC/TPS can cause ISC not to control idle.  E30 could also be a false code  Long diagnostic 'tree' to follow.....  

 
What year is the car?

87 sadan and how fast does this car run by the way just woundering digital speedo stops at 85 thanx

87, ya Dave S Texas is right, sorry. On the top speed, I'd say 120 mph.