I just bought a 90 Loyale manual 5spd pb 4x4 for $200 (score!). Put new timing components, filters, oil and fixed the cross-threaded spark plug. Still needs a timing adjustment, but it is throwing CEL codes 24, 31, and 34. I know how to fix code 34, I've been through that on my other Loyale. I couldn't find anything on the other 2. Any advise?

 

24- air control valve or circuit

31- throttle sensor or circuit

 

TIA

Edited July 1, 201312 yr by The FNG

I fixed code 31 by simply wiggling the throttle position connector, 

 

I hope it is that easy for you too.

 

Good luck,

Sam