06 ENGINE Trouble

[deathphoenix_21]

I have a 2006 Altima that just as of today doesnt want to start. I troubleshooted and came to the conclusion (by checking each one individually) that none of the 4 spark plugs are producing a spark. which leads me to my next point. if everythings turning over n working what would cause all 4 not to produce a spark. Theres a little black box on the side of the throttlebody (a relay box?) that is making a high pitched humm. does anyone know what this is and what if any sensors are connected to it. I opened the throttle body manually a couple times to ensure it wasnt stuck and it started for a brief min then died. so any help/info would be greatly appreciated thanks and sorry for the book but i tried to fit everything ive found up to this point.

[Darius]

The throttle body is a drive-by-wire system so it is basically a servo that controls the position of the butterfly valve in place of the standard throttle cable attached to the pedal. It sounds to me like there is something wrong with it, the ECU knows it, so it is cutting spark to the cylinders to protect the engine in case the throttle is stuck wide open or in any other position other than where it should be. Is there a check engine light associated with it not starting?

I think it is relatively common for these throttle bodies to fail prematurely on these engines. Your case is not the first one that I've read about.

I'd start there and let us know what you find. Do you have the FSM to guide you through troubleshooting the throttle body?

[deathphoenix_21]

thanks for the info. i do not have anything in regards to a manual for troubleshooting which sucks i know thats why i asked on here. Do you know if there are any i can get here or online? and the check engine light has never came on even now thats another ??? that throws me. thanks again and ill see what i can find, hopefully it doesnt require a new one they dont come cheap round these parts.

[Darius]

Here ya go:http://www.aubreyandcharles.com/ServiceManuals/

They don't come cheap anywhere especially new. Hopefully a junkyard has a decent one for you to use.