F150 lightning problem
Discussion
So off to halfords for some paint,truck starts fine about 3 miles later notice no
reaction to the throttle then revs up.
Pulled over as soon as ,idle is all over the place tap the throttle and get a big delay then it revs
up and then drops like a stone,tacho needle bounces off 0 mark and somehow keeps the motor going.
Then the motor just hunts real bad .Wish there was a dtc set but no codes .
Have a quick look nothing obvious,check as many vac lines as poss,seem ok.
Cock, ok so very nice man from the AA turns up,at least he has more tools then me
He seems to think its a vac leak,then has a word with base and then cleans the iac .
Unfortunatly no change.
Not getting anywhere so he orders up a truck to relay me home .
I pulled all the vac pipes off the intake/blower etc plugged the fittings and started the truck
no change still hunting.so kinda think no vac pipes are bad.
By now the battery is flat ,great. So at this stage bit diff to test with scanner.
Hope you guys are going to say yeah i had that it was the........................
I`m going with tps ,maf ,or iac. but $hit,what do i know
Fuel should be good .
Cheers guys and thanks for any help.
reaction to the throttle then revs up.
Pulled over as soon as ,idle is all over the place tap the throttle and get a big delay then it revs
up and then drops like a stone,tacho needle bounces off 0 mark and somehow keeps the motor going.
Then the motor just hunts real bad .Wish there was a dtc set but no codes .
Have a quick look nothing obvious,check as many vac lines as poss,seem ok.
Cock, ok so very nice man from the AA turns up,at least he has more tools then me
He seems to think its a vac leak,then has a word with base and then cleans the iac .
Unfortunatly no change.
Not getting anywhere so he orders up a truck to relay me home .
I pulled all the vac pipes off the intake/blower etc plugged the fittings and started the truck
no change still hunting.so kinda think no vac pipes are bad.
By now the battery is flat ,great. So at this stage bit diff to test with scanner.
Hope you guys are going to say yeah i had that it was the........................
I`m going with tps ,maf ,or iac. but $hit,what do i know
Fuel should be good .
Cheers guys and thanks for any help.
Had similair issues with a friends truck
No codes so we swapped MAF and TPS no different
Ran like a pig...
Did a fuel pressure check....
Turned out the fuel pump line had split in the tank.
Drop tank remove fuel hat assembly
Replaced all pipes which connect pumps to Y section and outlet pipe.
Job Done
No codes so we swapped MAF and TPS no different
Ran like a pig...
Did a fuel pressure check....
Turned out the fuel pump line had split in the tank.
Drop tank remove fuel hat assembly
Replaced all pipes which connect pumps to Y section and outlet pipe.
Job Done
V10 BAT said:
Hey cheers bud.
Need to do a fuel pressure check then.
Is there a take off on the fuel rail?
Thanks again Rick.
yes mate its on the passenger side of motor - left as you look at it.Need to do a fuel pressure check then.
Is there a take off on the fuel rail?
Thanks again Rick.
the rails are chrome and sit just above the coil packs.
you will need a connector to fit on the rail
if your not far away from Bagshot Surrey I can have a look for you.
Yep that happened to my L on the way home from work one day. After a phone call to Ricki it was eventually tracked down to the fuel pump hat. once I got it off
you could see that the pipe had come off one of the two pumps. Easy enough fix
but a bugger getting the tank off when its nearly full of fuel !
you could see that the pipe had come off one of the two pumps. Easy enough fix
but a bugger getting the tank off when its nearly full of fuel !
666svt thanks for the input mate.
I tried to check fuel pressure with my laptop and obdwiz software gauge read zero
but not sure if thats a pid thats not covered.
So do it the old way,should have a pressure check tool by thursday.
Fortunatly i`m cheap so only have about 1/4 of a tank of gas.
Cheers for now.
I tried to check fuel pressure with my laptop and obdwiz software gauge read zero
but not sure if thats a pid thats not covered.
So do it the old way,should have a pressure check tool by thursday.
Fortunatly i`m cheap so only have about 1/4 of a tank of gas.
Cheers for now.
V10 BAT said:
666svt thanks for the input mate.
I tried to check fuel pressure with my laptop and obdwiz software gauge read zero
but not sure if thats a pid thats not covered.
So do it the old way,should have a pressure check tool by thursday.
Fortunatly i`m cheap so only have about 1/4 of a tank of gas.
Cheers for now.
Open the fuel filler capI tried to check fuel pressure with my laptop and obdwiz software gauge read zero
but not sure if thats a pid thats not covered.
So do it the old way,should have a pressure check tool by thursday.
Fortunatly i`m cheap so only have about 1/4 of a tank of gas.
Cheers for now.
And get someone to turn ingition switch to on but not start.
You should hear pumps start up for about 2 -5 seconds
Listen for the sound of fuel pumping around inside the tank.
If you can hear it squirting about is a good sign the hoses have come off.
Then drop tank down and pull out the fuel hat assembly
It can be done without totally removing the tank.
SVTRick said:
Open the fuel filler cap
And get someone to turn ingition switch to on but not start.
You should hear pumps start up for about 2 -5 seconds
Listen for the sound of fuel pumping around inside the tank.
If you can hear it squirting about is a good sign the hoses have come off.
Then drop tank down and pull out the fuel hat assembly
It can be done without totally removing the tank.
Still worth checking the filter as well.And get someone to turn ingition switch to on but not start.
You should hear pumps start up for about 2 -5 seconds
Listen for the sound of fuel pumping around inside the tank.
If you can hear it squirting about is a good sign the hoses have come off.
Then drop tank down and pull out the fuel hat assembly
It can be done without totally removing the tank.
Pop the front fitting off the filter, connect a suitable hose and run that to a container. Oh yeah, put your fag out first.
Turn the ignition on and the fuel should pump rapidly into the container.
If it does, then it's something up the engine end.
If it doesn't, either the filter is blocked or the pipe has come off inside the tank as per Ricks suggestion.
Then, remove the filter completely and put the pipe directly on the line.
If you get petrol, the filter was blocked and if not, start dropping the tank.
The last time i went up to avon it involved an undone alternator nut,a mangled pully,shaft,chewed belt no power steering,a temp gauge on 3,000 degs.
This was on the way home down one of those narrow roads at speed in my vette.
That ended with another very nice man from the AA.
Yeah i`m up for it
Ok so the efi pressure tester i got has several connectors hoses etc,unfortunately
not the one i need,which is the same as a tyre valve.
So for now try ear to the tank filler, yep hear pump for about 3 seconds then quiet NO sound of fuel spraying about inside the tank.
Ok so now would be a good time to do the filter,so took off the fuel line coming out of the filter
put a length of rubber hose on the filter tube and other end into a gas can.
Key on ,get a squirt of fuel then it stops,i think the pump has stopped.
Key off and then on again ,yep another squirt and fuel flow stops.
Hope it`s the fiter, so disconect the filter from the line going into it and stuff this hose from the tank into gas can.
Key on and get fuel from line for about 3 seconds then flow stops,pump off agan????
I was expecting fuel to flow at pressue for as long as i had the key in the on position,like if i had a big enough container i could empty the tank??
If you turn key on it will flow fuel but then stop ,turn key off then on again it wil repeat and then stop.
I can understand it would do this if all lines are connected ,the pump would prime the lines and then stop,but with nothing on the line i would of expected a constant flow.
The f/pump relay clicks with key on and does make another click with key off,so assume that is okay.
New filter installed motor starts ok revs drop back to 1k then drops to 300 ish then surges to 1800
kinda does this 3 times then stalls.
Out of interest or stupidity sprayed cold start into intake tube ,air filter off .
This made the motor smooth and kept it going but stalled as soon as i stopped the spray.
Go on tell me to take the tank out
Cheers
not the one i need,which is the same as a tyre valve.
So for now try ear to the tank filler, yep hear pump for about 3 seconds then quiet NO sound of fuel spraying about inside the tank.
Ok so now would be a good time to do the filter,so took off the fuel line coming out of the filter
put a length of rubber hose on the filter tube and other end into a gas can.
Key on ,get a squirt of fuel then it stops,i think the pump has stopped.
Key off and then on again ,yep another squirt and fuel flow stops.
Hope it`s the fiter, so disconect the filter from the line going into it and stuff this hose from the tank into gas can.
Key on and get fuel from line for about 3 seconds then flow stops,pump off agan????
I was expecting fuel to flow at pressue for as long as i had the key in the on position,like if i had a big enough container i could empty the tank??
If you turn key on it will flow fuel but then stop ,turn key off then on again it wil repeat and then stop.
I can understand it would do this if all lines are connected ,the pump would prime the lines and then stop,but with nothing on the line i would of expected a constant flow.
The f/pump relay clicks with key on and does make another click with key off,so assume that is okay.
New filter installed motor starts ok revs drop back to 1k then drops to 300 ish then surges to 1800
kinda does this 3 times then stalls.
Out of interest or stupidity sprayed cold start into intake tube ,air filter off .
This made the motor smooth and kept it going but stalled as soon as i stopped the spray.
Go on tell me to take the tank out
Cheers
V10 BAT said:
Adam mate
had a look at that,but don`t have anything up there except the big evap canister.
This has one electrical connector with just two wires going to some kind of valve.
Nothing else electrical in that area.Probably best to just drop the tank and check things.
cheers bud
You can test fuel pressure from tapping on rails.had a look at that,but don`t have anything up there except the big evap canister.
This has one electrical connector with just two wires going to some kind of valve.
Nothing else electrical in that area.Probably best to just drop the tank and check things.
cheers bud
Just remove the valve and clamp a pipe over it to a gauge
should read just under 40 psi at idle
There is no module under truck
Only the relays by the fuse box
Check voltage to pumps as you may have a dropping resistor fault for the low pressure running.
If no luck mail me for a contact number
Cheers mate.
I did have a look at what i think is the fuel pump resistor.
ceramic thingy above the intercooler pump.
wires are black and crispy,and fell apart when i took it off.
Key on and the pump did run for a few secs ?
There is another one of those higher up which looks a lot better.
Are these for low and high fuel pressure.
Would of thought the pump would be dead if they were that important?
Gonna try and cobble a gauge together just so we know.
cheers bud
I did have a look at what i think is the fuel pump resistor.
ceramic thingy above the intercooler pump.
wires are black and crispy,and fell apart when i took it off.
Key on and the pump did run for a few secs ?
There is another one of those higher up which looks a lot better.
Are these for low and high fuel pressure.
Would of thought the pump would be dead if they were that important?
Gonna try and cobble a gauge together just so we know.
cheers bud
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