02 f250 diesel wait to start

installed a viper 791. tech sheet said to use programmable wait-to-start (10, 15, or 20seconds).

customer is having issues with it not starting on the first or seconds attempt.

why cannot go to the glowplug light in the dash to use for my wait-to-start? i got it programmed to the lowest setting which is 15seconds...should i maybe snag a bitwriter to get it down to 10seconds?


he also says that when it does remote start that it idles at like 1000-1200rpms but when he presses the brake to disengage the r/s it idles back down. i solder all my wires (including tach).

you cant use the glow plug light in the dash because the light is done by data. if the customer is having a hard time getting the truck to start at 15 seconds, you dont want to go to 10, you want to go to the next highest setting, 20seconds. this will allow the glow plugs more time to get hot enough for a start.

if i set the timer for too long will the glowplugs eventually time-out/shutoff?

yes eventually, but it is more likely to result in an engine start that way rather than going the other way, or just leaving it at 15 seconds.

It's not even cold outside yet, sounds like there's other issues other than the glow plug timer.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Velocity Motors wrote:

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It's not even cold outside yet, sounds like there's other issues other than the glow plug timer.

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that sounds completely possible.

blitzdemon, what are you using for a tach signal?

got tach from GREEN / WHITE wire in 5pin harness that was taped up behind parkbrake release.

he's got a EDGE programmer in there also, that wouldnt have anything to do with the issues at hand would it?

Use the alternator sense wire on that truck instead as I've had problems using that GREEN / WHITE wire under the dash in the past.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

where/what is the alt sense wire?

or should i use -
''On diesel vehicles the tach wire is green or white, in a 42 pin plug under the clamp on the engine side of the air intake duct.''

blitzdemon wrote:

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where/what color is the alt sense wire?

or should i use -
''On diesel vehicles the tach wire is green or white, in a 42 pin plug under the clamp on the engine side of the air intake duct.''

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edit

The 02 wait to start is NOT data. There is a relay pack under the hood on the pass. side, it's attached to the firewall.

It's aluminum with loads of fins on it, with 2 or 3 plugs.... white wire, negative signal. (while plugs are warming)

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got to look at the truck yesterday finally.

checked around for the wait-to-start wire under the hood. couldnt find 1.

checked tach wire i was using. getting a solid AC signal from it.

checked all my ign harness wires. all were good connections. i was powering everything up that was needed.

checked the r/s menu to make sure the ign/acc wire was selected as a ign. and i also changed the option to power on acc during wait-to-start (option 3-13? i think).


called me up today and said still was having issues. only thing i can think of thats left is should i have changed the tach threshold jumper? otherwise im just goin to tell him to take it out.

any1 got any other ideas?