Lexus Troubleshooting Questions? Ask a Lexus Expert
Hi Im David, sounds like you have some issues going on here. Lets try to figure it all out. correct me if im wrong, you have no injector pulse. you have a coolant leak that isnt visible, and you engine is loping.
Here is a schematic of the engine control system. you might want to check the associated fuses and relays to the injectors. you might want to do a cooling system pressure test to verify where the leak is, and you might want to get a can of throttlebody cleaner and spray around all sources of the possible vacuum leak such as the intake base, throttlebody, air intake tube, all vacuum fittings/hoses.
it says a 1991
just going by what the original entry was
lexus wasnt around in 81 brother
91-95 were the same...all obd 1
if you look at the diagram the fuel pump relay is fed by the circuit open relay which is fed by the 10 amp ign fuse....look there
let me know if you find anything
pull it out. find where 12 volts is coming into it, then jump that voltage to the other side to feed the fuel pump relay..... dont text and drive...lol
Ok thanks for getting back to me, let me do a little digging in my resourcres. Ill get back with you. we'll figure this out.
Ill probably join you in the dumbfounded category......its gotta be a loose connection or chaffed wire... Ill be back
sorry for the delay. you need to check the ground at the computer. make sure they are tight and not corroded
you ready to tackle this?