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Old 11-27-2009, 10:50 AM   #1 (permalink)
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Default Major Electrical Problem???

I am in need for a little advice or comfort after my 2004 g35 6mt had a major problem. I was driving home last night and all of a sudden it went to full throttle and to the rev limiter. I shut it down, waited a minute to catch my breath and tried a restart. Same thing...it went WOT again. I shut it down, opened the hood and was met with the putrid smell of electrical...It's was towed back to my garage and I'm trying to see and obvious signs of were the problem may be...I removed the intake up to the throttle body and when I turn the key to the on position the butterfly stayed in the closed position,and when I pressed on the accelerator the butterfly opened and closed what appeared to be normally, however there is a high pitched squeal sound coming from the throttle body control unit, and I know this is not a normal sound...

A voltage check in the connector showed a ground condition were there should have been 12 volts. After replacing the Throttle Body Unit I turned the key to the on position and the same squeal sound was heard. No one at Inifiniti has heard of the Throttle going Wide open, and it seems to me that the only thing that would cause this would be a short somewhere which may be explained by the obvious smell of electrical. I traced the wiring as best I could and can't find any obvious signs if arc thru on the wiring...I'm lost at this point. Any suggestions would be appreciated. I'm trying to do this as cost effectively as possible after being out of work for the past year, but I need the car. Thanks

See item #15 on how this problem was resolved!!!!!!!!!!!!!!!!!

Last edited by falconav8r; 11-28-2009 at 06:04 PM. Reason: problem resolved
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Old 11-27-2009, 02:34 PM   #2 (permalink)
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Sorry, never heard of someone having a similar problem.


the floor mat didn't happen to get bunched up on the pedal did it?
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Old 11-27-2009, 02:34 PM   #3 (permalink)
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and welcome to crazyville!
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Old 11-27-2009, 04:02 PM   #4 (permalink)
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That's a new problem to me. Hope you figure it out. I'd think the throttle body would be the first part to eliminate as the cause.
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Old 11-27-2009, 08:04 PM   #5 (permalink)
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I did change out the throttle body and it is making the same high pitched sound which leads me to believe the original TB is fine...I must still have a short somewhere...
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Old 11-27-2009, 08:31 PM   #6 (permalink)
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are you saying the TB is making the noise?
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Old 11-28-2009, 08:08 AM   #7 (permalink)
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Yes, there is a high pitched squeal coming from the electrical controller on the TB. The new one is making the same noise.
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Old 11-28-2009, 10:06 AM   #8 (permalink)
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ok time to nitpick.

when you say you measured ground, was that with an ohmeter or did you just get 0 volts?

did you happen to check for an AC voltage?
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Old 11-28-2009, 10:10 AM   #9 (permalink)
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have you tried resetting the ECU?

do you have any mods to the ECU? Osiris, Cobb,Technosquare???
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Old 11-28-2009, 12:28 PM   #10 (permalink)
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yes the connection on the IPDM was 6 volts. As far as the ECU there is a piggy back controller from the Vortech that was installed 3 years ago. All the wiring looks good and the electrical smell is strongest at the TB side of the engine.
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Old 11-28-2009, 01:35 PM   #11 (permalink)
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you didn't mention the piggy back box. That could be the problem there.
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Old 11-28-2009, 01:40 PM   #12 (permalink)
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oh FI...is there any way to seperate the piggy back and super and run just on oem stuff?
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Old 11-28-2009, 01:41 PM   #13 (permalink)
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have you contacted vortech?
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Old 11-28-2009, 03:17 PM   #14 (permalink)
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I really feel strong about the fact that the piggy back and factory ecm are not the problem. I do have an Infiniti mechanic coming over to do some trouble shooting. THe electrical smell is coming from the drivers side of the engine. It has been 8 days and I still smell it somewhat. I'm sure we will try to eliminate the computers as a problem but will let you know what we have found. I really don't want to have this thing towed over to infiniti. They have a tendency to want to blame everything on after market add ons and drawing fast conclusions!
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Old 11-28-2009, 06:02 PM   #15 (permalink)
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Default Electrical Problem Resolved

After testing all the connections, we did 1 last check. I got back in the car and with the car ignition in the on only position, pressed the accelerator to the floor.
The throttle stuck in the Wide Open position! Now don't laugh as this can be a learning experience for anyone considering heavy rubber winter floor mats...you see where I'm going with this????
Apparently when I got back in the car for the 3rd round of tests, I moved the mat forward, and the accelerator pedal stuck to the floor!!! This was a cheap fix but had cost me a week of frustration. I'm happy with the outcome but learned a valuable lesson. CHECK the MATS!!!!
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