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AEM Fueling Issue

Old 09-23-2018, 04:59 AM
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Afternoon everyone,

Its been a while since I've last posted on here; much less driven the S. The S was supercharged in the beginning of last year, and it then developed a weird issue where the fuel pump would not prime after the vehicle is powered off. Only by resetting the battery (remove the power) will it then prime. I remember speaking to AEM about this; to quote:
Well if you are fully up to date, the description of your issue is still indicative of some type of feedback issue that is keeping your unit connected when you power down.

Seeing as that you do not have any upgrades that required wiring aside from the wideband gauge which has been isolated, the only other way to troubleshoot this would be to start unplugging sensors one at a time when you are unable to get the fuel pump to prime. You want to do this in sequence.

When you key off and key back on where the fuel pump does not prime, Unplug a sensor and cycle the ignition again. Repeat this until the fuel pump primes. Once it does, you will know that it was likely linked to the last sensor that was unplugged. Plug it back in to recreate the issue and we can go from there.
Which sensor is he referring to? Are we talking about the sensors in the engine bay, so things like the MAP, TPS etc?
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Old 09-23-2018, 10:26 AM
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sounds like it, the stuff which feeds the AEM, you can see the wiring diagram in the service manual to see what is wired there, it would be things like TPS, MAP, coolant temp etc i guess
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Old 09-24-2018, 02:52 AM
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Originally Posted by Nottm_S2 View Post
sounds like it, the stuff which feeds the AEM, you can see the wiring diagram in the service manual to see what is wired there, it would be things like TPS, MAP, coolant temp etc i guess
I've got the wiring diagram from the service manual; it lists the various sensors. The knock sensors on the back of the box aint it - that's gonna be a ball ache to get to if its that.
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Old 09-27-2018, 03:47 AM
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Mine had this issue but normally if i crank it then off and on again it would prime and would normally only do this when warm. I have to admit I cannot remember how i fixed it.
It hasn't done it since my second visit to EFI so maybe Chris fixed it.
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Old 09-28-2018, 01:22 AM
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Well Chris was the one who initially mapped my supercharged S The S has been sitting for over a year; so its overdue on a number of things. Once I fix this issue, I can get started on changing four tyres (these should be changed as its literally sat on the drive) discs and pads and fluids before.. geo bolts.
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Old 09-28-2018, 04:50 AM
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buy a sabre saw! took me a day and about 9 blades but its doable on your drive.
Got my sabre saw from lidl for £39.
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Old 10-01-2018, 01:20 AM
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Originally Posted by johnckeen View Post
buy a sabre saw! took me a day and about 9 blades but its doable on your drive.
Got my sabre saw from lidl for £39.
Thats a good point. Will tackle that once I can move the damn thing first.
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