iwanagofast

I have a 94 teggy with ls vtec and it idles around 1500 rpms and if you turn on the head lights or heat or open close windows or radiator fan turns on it trys to cut off and ive checked grounds and check the harness and replaced the alternator and i just cant quite figure out what is going on . would appreciate any advice to finding this dam issue

Fabrik8

Measure the voltage at the battery and at the alternator while it's behaving like that. It's possible you have a broken sense wire going to the alternator or something like that.

rowe4166

have you checked the fast idle valve I had the same problem with my car

iwanagofast

fast idle valve??? and ill check the voltage when its doing that i know at regular idle it had 12+ volts

rowe4166

I meant Idle Air Control Valve. It compensates the idle on your vechicle when A/c or headlights or Radiator fans ect. are functioning. If it was something with the altenator you would have a battery light on in your instrument cluster.

iwanagofast

oh yeah i thought it was that too but it does it even after it warms up just seems like if im using to much at once it wants to cut off the battery is in the trunk if that would make a difference

Dubee88

Idle Air Control Valve would make sense...the motor should adjust idle when you are putting more strain on the system. Is it throwing any codes?

iwanagofast

no its not throwing any codes just seems like theres just not enough power there cause if you leave everything off it idles fine runs fine but if you turn headlights on heat on and then the radiator fan comes on it tries to cut off every time i idle ive gone through the harness a bunch of times and cant figure it out which side of the fuse box is the starter wire supposed to connect onj