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It started doing this yesterday morning. Checked all fuel related connections and they are good to go. Could my fuel pump be going bad? Fuel pressure drops from 57-17 psi when in the on position. Using my AEM logger, but not sure exactly what to look for...
http://www.youtube.com/watch?v=jPO7ebQEQho
just bought this to replace the walbro Aeromotive Fuel Pump - Internal Drop-In-Tank - 340 lph STEALTH Pump*-*Mitsubishi 3000GT*/*Dodge Stealth Parts
Did you rule out the aem? Does the same thing happen if you put the stock ecu back in?
He's speed density on alternative fuel and 780cc injectors. It's not like, "Gee I'll just put the stock ECU back and see if it works." :lo5l:Quote:
Originally Posted by Nytron
OK, that dies QUICK. Does adding more fuel help?
You seem really hung up on the pump, which I don't quite understand. Who cares what your fuel pressure drops to when the pump quits - is it OK while the pump is running? If you want, hook that thing to a battery and leave it running constantly. If 57psi is your base pressure, it shouldn't drop below high 40s when starting.
thts the thing, i cant see what it is running cause it wont stay running. I held off on the pump till i narrow it down more
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Originally Posted by Sin'sVr4
:Innocent:Quote:
Originally Posted by Intropy
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Originally Posted by Intropy
Or try adding some fuel at idle settings. Just make sure you remember what you changed.
Im betting on the fuel pump. You can alredy tell the check valve is bad. Look how quicly the fuel pressue falls off. Shouldnt fall 40 psi off of refence pressure.
why don't you get someone else to crank the car up and you can watch the fuel pressure?
my supra pump and aem fpr drops pressure really quick after starting to. It didn't use to do that until I drove back from indy last year.
I was on a walbro pump and the aem fpr and before the trip it would hold pressure for a few hours. After the trip in seconds it dropped a lot, which caused the car to crank a bit longer to start. A supra pump didn't fix the problem.
I suspect the aem fpr, I may try a rebuild kit to see if it is bleeding pressure off internally.
It has not caused any problems though, besides it takes an extra sec to start.
Is the main power relay clicking off when it shuts off?
Sometimes they go bad.
DG
I would look at the fuel table first.
-Chris
nothing changed on the fuel maps. I am putting in a different wally today to see if the current one went bad. Then go from there.
Is it possible that your battery dying caused some of your settings to get messed up?
Bob. :)
u think? all settings look good to me. no changes
Did you get this fixed? I am having the same issue..
His ems unit was bad and had to be replaced.
Wow, that is what I was afraid of to.. I reloaded the stock basemap and made a few changes... car starts .... <wipes brow> now comes the startup (warmup) tuning...