jsamarin

so for the last month or so, my 93 v6 pickup doesn't wanna start on the first try after it has sat over night. what i mean is, if you jump in and immediately turn the key to "start", the starter engages for a milisecond then nothing. you can hold the key on start for as long as you want and nothing. no clicking or whining. no sounds at all. It will however start if you turn the key to "on" and let the fuel pump run for a few seconds then try and start it and it fires up just as it should.

Has anyone had this issue with their 3.0 truck or runner before? ive searched for the past week and haven't come up with anyone having this problem, however i'm sure its not unique to my truck.

All help is appreciated!!

nothingbetter

sounds to me like its a built in safety feature which will cut power if the ecu doesn't read a certain fuel pressure in order to save your truck from running lean. But I'm not framiliar with that engine or truck so I could easilly be wrong. You should probally be letting it build up fuel pressure first anyways.

Marc

I didn't think the fuel pump ran in the on position like that.
I know some other vehicles do.

jsamarin

maybe the fuel pump doesnt run when the truck is in the "on" position, but it was the only logical (to me) reason why it starts fine if i wait a few seconds.

Marc

I believe it runs in the start position and continues to run in the on position IF the engine starts. It determines if the engine started by the Air Flow Meter (AFM) vane position.

scope103

There's no connection.

As Marc says, the fuel pump does not run in the "on" position, until the truck is already running, as indicated by the VAF (Volume Air Flow meter). The fuel pump does run in the "Start" position.

But if you "hear nothing" in the start position, the starter is not running (no, there is no safety feature that monitors fuel pressure). The starter is powered by the battery through the solenoid powered by the starter relay through the Park-Neutral switch, which is powered by the ignition switch. In other words, one of those connections is not being made when you turn the key. Just picking out the one most likely to fail, my guess is that your starter brushes are shot, so that when it turns for a millisecond it hits a dead spot and quits. But before you replace the brushes, you can just use a multimeter to find out where the circuit is open.