i have a 86 non turbo, the crank angle sensor failed and i replaced it. it runs good but when i step on the brake in drive it kills the engine. during the trouble shooting fiasco i un pluged some sensors trying to narrow the problem but no luck...can anyone help with this...i am new here to this site

 

Welcome to ZDriver!

It ONLY happens when you apply your brakes? Does it happen at ANY other time? Like just when you coast?

 

thanks,it nearly dies when i put it under electrical load while idling.it will die when i put on the brake.i disconected the booster vacuum and it still dies.i checked the voltage to the battery with a meter and im getting 14.5 volts never dropping below 12.the car runs great unless i put it under load but that is only for a second if i keep the rpms up,after the initial load it runs fine

 

so it's the brake lights that are an issue? not the brakes? is your idle too low? it should be just on the high side of 700 i believe. if not, pretty close to that.

 

i have the idle set and i just got back from the junk yard with a iacv,put it on and nothing changed,all the brake lights are working but i have not checked to see if i am getting good ground back there....could be an issue pulling too many amps....thanks for the tip,i will look at that later. bout had it for today..dont want to take the maul to her just yet

 

Are you checking voltage when there is an electrical load (like brake lights... heater... headlights), or just when it's idling?

 

i checked the voltage at idle in drive with the parking brake on and it is 14.5 before load, step on the brake and it drops momentarly to 12 but goes back to 14.5. i checked the codes and im getting 23 and 31. i checked all my connections on the idle circuit and as for the load...there is nothing electrical on....could i possible have a shorted wire from the alternator????

 

So it dies if you are moving, doesn't die when idling? Have you done a high speed (rpm speed) voltage test? It's sounding like your alternator is toast.

ECU codes: http://z31.com/oboard/archives/view.pl?151

#23:
1.Idle Switch
2.Throttle Valve Switch
1.Open signal circuit
2.Throttle valve switch or circuit

#31:
1.Engine Contrl Unit
2.Air Conditioning Switch
3.Lighting Switch
4.Fan Switch
5.Power Steering Switch
6.Load Signal
1.Abnormal input signals
2.Open or shorted signal circuit
3.Open or shorted signal circuit
4.Open or shorted signal circuit
5.Open or shorted signal circuit
6.Open or shorted signal circuit


I'd start with taking your car to a local parts store (Autozone, NAPA, Kragen) and have them do a real alternator load check. If that checks out as okay, check the TPS and idle systems.

 

The wire that goes to the firewall from the negative battery terminal.