fuel pump problem?
restored 68 Mustang, 302, 5spd, started out with 30003 system, then went to a FITECH in tank pump.
Having problems with pump whine, stalling when downshifting at speed, stalling at idle. Retuned IAC steps per instructions. Now having a lot of problems with acceleration, i.e. there has been little (got to 60mph in 5th gear the other day and that's it).
I have an RMA pump 40102 that I'm having replaced tomorrow, but is this really a pump issue or just bad tuning? The guy who installed the system didn't initially set the primary idle adjustment screw, so all the learning the system did for the first 1000K miles was based on that.
I set the screw and got IAC steps between 3-10. But the problems with acceleration (bogging) and the pump whining continues.
The following logs were when the car was warm 190 degrees. First one is just idle, second one has some acceleration data. Any help please?
https://www.dropbox.com/s/z366xmlrh2yio00/DashBoard1.csv?dl=0
https://www.dropbox.com/s/rvx22zl2j0fm9yx/DashBoard2.csv?dl=0
Thanks.
also: I got the new hex file from you the other day, uploaded it, reset the learning on the unit, and so these data are from about 100 miles of learning.
I see a few things. Don't want to overwhelm you. Your system is doing its job. Getting a little bad information though.
You said your engine was at 190 during datalog, but the Fitech coolant sensor is reading low. There are 2 solutions. Your software has a CTS calibration menu, where you can adjust the system to read the sensor correctly. Or, you can do it the way I do and buy a Delco sensor. Much easier to change sensor and move on. This is a GM sensor used in most vehicles, example 1992 c1500 305tbi.
You do have a trouble code 74. This is a cooling fan code. If you are not using the fan wire, turn the fan feature off.
I would suggest you get a fuel pressure gauge. If pump is really loud, it is most likely working too hard. Hopefully your installer used the Fitech Orange wire to go directly to the pump, without a relay. If so, you can use PWM to slow the pump and reduce the noise. Just make sure it maintains pressure. 58psi (400 and Meanstreet 800 are 43psi).
Make sure your grounds are adequate. Here is an example that has never failed me. 2ga from battery to block, 10ga battery to frame, 10ga battery to body.
Austin, thank you very much for your help.
The fuel pump was switched out and it is QUIET, so yeah, that's a thing.
I just did a quick data run, could I ask you to look and see what you think? I'm not certain I need to reset learning either (the pump that got switched out was a 40107. The RMA one in there now is 40102).
https://www.dropbox.com/s/2qt3ciyqv6n4g31/DashBoard5.csv?dl=0
Also, the mechanic said the pump receives 12v at start up, but then it drops down to a steady 6.8. There's no relay on the wire. He wasn't sure if that's what it's supposed to do, so I thought I'd ask. Car is running great.
Glad the fuel pump is working for you. We can leave that area alone for now.
Need to get that coolant temp sensors replaced. I referenced the replacement earlier.