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Old 10-06-2015, 12:04 PM   #1
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Default Help with stalling at full throttle

So I have a brand new MS3 installed on my newly turbo'd beast. The basic tune is done and running pretty well so it's time to take it out on the road and let the Tuner Studio Analyse Live do its' thing. AFRs look good, a little stumble off idle but that can be adjusted later. Once I get on the freeway and the instant I get in to the throttle the engine dies out of the blue, running normally then nothing. Made lots of friends trying to get to the shoulder too. The engine started right away but stalled again as soon as I released the key. It did that a couple times then caught and stayed running. Over the course of a 25 mile drive it happened 4 more times, each time it seemed as though it took less throttle to get it to act up.
Has anyone else had a similar problem? Any clues?
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Old 10-06-2015, 01:06 PM   #2
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log.

repeat.

post log.
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Old 10-06-2015, 10:02 PM   #3
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Sounds like you need to tune moar.
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Old 10-07-2015, 09:58 AM   #4
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I'm pretty sure I have a hardware issue rather than a tune issue in this particular case. The car starts and runs just fine, as long as I have the ignition switch in the start position, just a bit rough on starters. As soon as I release the key, put the switch in to the run position, the engine dies. I haven't had time yet to see whether I'm loosing ignition or fuel.
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Old 10-07-2015, 10:07 AM   #5
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so the car runs when youre using an electric motor to turn the engine. nice!
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Old 10-07-2015, 11:52 AM   #6
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Yeah, now all I have to do is find a starter that will take about 28K RPM all the time and I'll be in fat city.

It's fuel for sure. I got it started this morning using a power probe. It wouldn't start with the power probe alone so I squirted a little brake clean in to get 'er fired. I needed to give it about 5-10 seconds of brake clean help before it would fuel and idle on it's own.

The fuel pump tested at 52psi before I started this project and I'll be testing it again. That being as it may, it's just odd that I appear to be loosing fuel pressure immediately after start but regaining pressure after a few seconds. Waz up w' dat? More testing and head scratching.

Man I want to drive this car, dammit!
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Old 10-07-2015, 07:01 PM   #7
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OK, no fuel pump. Jump the fuel pump at the diagnostic box and she fires right up. The weird thing is that if I keep it running for 5-10 seconds it'll run on its' own without any fuel pressure. I can even drive it! No freekin' wonder it stalled on full throttle. The wonder it it ran at all.
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Old 10-07-2015, 08:02 PM   #8
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In case anyone's interested the problem's fixed. Turns out I had the jumpers at the air meter connector switched. All's well.
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