help high idle

[Fred9981]

i just got my engine rebuilt like a month ago and i have the isc go bad on me. the idle was bouncing from 1k rpm to 2k rpm and i installed a new isc and and i justed the idle through the biss screw and it was running good with no idle problems for a week and now the idle goes to 1800 rpms when in park i adjust the biss and its good for a while and them it goes back up. isc is still good i check it already and the biss screws is good to

some one help me


thanks

 

[crankbender]

your biss screw is backing out if you continually can adjust the idle with it. To solve this problem replace the o-ring (#5 i beilieve) and use some vibratite or silicone on the threads to hold it in place.

 

[Fred9981]

the codes that the computer gave me are p1500 and p0505

does any one know what the mean

 

[DSMeclipse4G63]

p1500- generator fr terminal circuit malfunction
p0505- Idle air control motor circuit malfunction

Andrew

 

[Fred9981]

what do this codes mean and how can i trouble shot this

 

[DSMeclipse4G63]

The idle air control has a mafunction in the circuit i.e an open excessive resistance, short to pawer, short to ground or the is just a bad idle air control. the other code is for a generator(altenator) circuit malfuntion.
Andrew