I replaced the TP sensor, Idle air control, oxygen sensor, rebuilt the throttle body, and fuel relay. My 5.0Lv8 keeps stalling while driving and at stops. The code reader says primary and secondary fuel pump circuit failure, and low idle. What should I do know?
2006-11-19 12:55:43 · 8 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
I forgot to mention I did replace the fuel filter the same time as the fuel pump relay and the idle air control valve. Can the fuel pump be clogged with debris that might cause the engine to stall often? If so is there a way to rebuild it or flush it out to correct the problem for now till more money is available next month to replcace both pumps in both tanks? I think this may be my problem beacuse my front pump went out first about 5 years ago. I would run the truck often with 1/4 tank of fuel or less.
2006-11-21 12:58:24 · update #1
Still having problems huh?
I noticed you replaced the O2 sensor.
The other thing I mentioned was the EGR valve.
I don't see a fuel filter listed in your list of items replaced?
Vacuum leak?
We (Yahoo Answers Members) could probably have saved you money and time if you would have given a detailed explanation of problems before hand.
Live and learn............
2006-11-19 13:37:44 · answer #1 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
The code shows a probable electrical interuption in both the primary and secondary sides of the relay as observed by the PCM.
Low idle codes will happen due to the stalling....
As someone said, observe the fuel pressure on a gauge.. It should stay 30 psi at idle and raise to about 40 psi or so max.
Check all the grounds and possibly redo them.. the ones on the car body near the battery are known for corrosion issues.
A primary problem could possibly cause the secondary fuel pump code..
Basically the PCM uses signals from the distriutor (using the ignition module and hall effect sensor) to send the signal that the engine is running to the PCM. The PCM then grounds the fuel pump relay to turn it on.... If the ignition was bad, it usually sets up a pip code, which it didn't apparently.
So also check the fuse links going to the fuel pump (that's what provides power to the relay) as they can get brittle and cause problems... Also use a Ford relay, as I've had many from autozone cause issues (resistance on primary coil pins 85 and 86 should be around 60-80 ohms)
Hope this helps
2006-11-19 13:23:48 · answer #2 · answered by gearbox 7 · 0⤊ 0⤋
Only a few things with this. 1. Bypass the enertia switch. If that won't fix it, then the next step is to check all of your wires on the selinoid. One feeds the computer. I would recommend cutting out the fusable link and straight-wiring it. If that doesn't fix it, it may be the computer itsself or the sip in the distributor. The only thing that the computer controls is the fuel injection...that's it. But, do the computer last. Good luck.
2006-11-19 14:59:11 · answer #3 · answered by jeff s 5 · 0⤊ 0⤋
Run a fuel pressure guage on it and see if the fuel pressure is dropping when the car stalls. You may have a faulty pump or a plugged filter.
2006-11-19 13:00:57 · answer #4 · answered by ? 2 · 1⤊ 0⤋
Even though the code reader points towards fuel, don't forget about Ford's TFI ignition that fails intermittenly when it gets hot.
2006-11-19 13:16:50 · answer #5 · answered by The Bandit 1 · 1⤊ 0⤋
I'm not being smart or a wise a88 but i think if i were you i would replace the truck. once this starts happening there seems to be no end to it.
2006-11-19 13:04:13 · answer #6 · answered by roy40372 6 · 1⤊ 0⤋
have to agre with several people on this check fuel pressure and dont rule out ignition
2006-11-19 13:51:50 · answer #7 · answered by turbo_812000 2 · 0⤊ 0⤋
Buy a new truck.
2006-11-19 13:01:04 · answer #8 · answered by Fester 3 · 0⤊ 1⤋