heres the deal i replaced the altenator and battery changed spark plugs and wires on my non turbo 1990 toyota supra at idle my altenator isnt charging the battery i beileve that this is the reason my check engine light is on , when im driving the voltage is only at about 14 volts i didnt do a voltage drop test yet but i wanted to get some ideas first
2006-07-01 02:54:25 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
14 volts is very good. that's more than you need. if your car isn't dying..then alternator is good. here's a test...with car running, disconnect the battery + wire. if car runs, then alternator is working. if you can't seem to start the vehicle, then you have issues with the starter, or the charging system (alternator, battery, starter) check all these wires closely.
2006-07-01 02:59:32 · answer #1 · answered by Ryan 4 · 0⤊ 0⤋
A properly operating charging system should produce between 13.6 and 14.6 volts,on a 12 volt system.14 volts is within the norm. The "check engine" light usually illuminates when there is an emissions control malfunction, but not always.
Have your vehicle inspected by a qualified technician.
2006-07-02 01:55:29 · answer #2 · answered by d_cider1 6 · 0⤊ 0⤋
Check engine light probably means that your anti-smog systtem is messed up or worn out. Oxygen sensors and catalytic converters are definitely in need of replacement in a 1990 if they haven't recently been done.
Expensive repairs.
2006-07-01 10:20:13 · answer #3 · answered by Truth be Told 3 · 0⤊ 0⤋
Your car is too old.
At this age a car will do well just if your a mechanic to fix all the problems!
2006-07-01 09:58:56 · answer #4 · answered by Plain truth 3 · 0⤊ 0⤋