Hi I'm having problems with my mk4.It had an engine change as the cam snapped in 2 place and now it's not running right.Problems are:- 1) if you tap the acceleratior when still the idel revs go up and down and then stall. 2) big puffs of black smokeI would appreciate any help.
hi thanks for the reply.
I have just been out and adjusted the crank sensor and it didn't make any different (apart from not being able to use my throttle)
I took the two 10mm bolts out and still the same.
Im having problems finding the intake butterfly on the air inlet to the inlet manifold ensure this flap isn't being held shut (starving the engine of air ).
Someone told me that its a fueling problem (split in pipe somewhere) also someone has said it might just need a software update???
Do you know what sort of reading I should be getting from the MAP and MAF?
if I disconnect the MAF the car will start but will stall as sson as I press the accelerator.
removing the oil cap makes no differents.
I will have a look at the actuator rod in the morning as its getting dark and its right at the back of the engine
driving the car is fine, it has full power and boosts great, sometime coming to a junction but that's when its in idle again.
the engine came with the injectors and pump but I did have to swap the turbo and egr system.
I have reset the egr valve learned values
if you rev the car to about 2000rpm then take your foot of the throttle the revs constantly go up and down between(###) ###-####pm (the black smoke is only under throttle) 60% of the time the car will then stall but if you do the same with your foot on the clutch then it will stall 100% of the time. the other thing is that when it stalls if you try and start it it wont start (you can let the car turn over for 3sec or 10 secs and it wont start) but if you trun the key off then back on it will start straight away.
just thought when the bloke put the new engine in he said that the mk4 injectors didn't need programing like the mk3 did is that right?
the lowest reading I get on the rail is 26000kpa just before it stalls(see below)
I will try blanking the egr tomorrow.
I have taken readings of the egr:-
13 seconds before it stalls
revs = 1321rpm
commanded egr % = 7.84%
egr valve duty cycle = 52.54%
egr difference between command and actual = 99.22%
fuel pressure rail = 34530kPa
3 seconds before it stalls
revs = 805rpm
commanded egr % = 0.00
egr valve duty cycle = 28.71%
egr difference between command and actual = -100.00%
fuel pressure rail = 64080
revs = 492rpm
egr valve duty cycle = 4.79%
fuel pressure rail = 26510kPa
thanks you I will get back to you in the morning after ive blanked the egr and checked the actuator rod.
I have blanked the EGR valve and no differents apart from when driving I get the revs round to about 3500 the engine seems to struggle.
Also today I poped into ford for them to check on there machine for any fault codes but nothing showed up, they did update the software and reset the cam sensor and the air intake but its still the same.
Thanks for the time and effort.
The Fuel filter was changed when the engine was changed.
I have just been out and measured the fuel pressure after I stalled it, when I turn the key for about the first 3 seconds its all over the place (between 6000-34000kPa) but after about 3/4 seconds it settles around 27000kPa (I tried for about 8 seconds)
The car has 240000 miles on the clock but the new engine only has about 90000 on it.
I don't have the vin or reg of the car it came out of.
Just a thought and im really hoping this has nothing to do with it but when the engine was changed the bloke lost the two bolts that hold the two a/c pipes onto the compressor so the pipes have just been tied up.
Thanks in advance
I totally understand just wishd you lived in north wales lol.
Where would I find the engine breather hoses?
I have checked these pipes and all are connected right.
I have also just been and swapped the fuel filter and housing from another MK4 and wiggled the wires on the 3 sensors and the fuel pipe but still no different.
I haven't done a leak test yet but have ordered a Delphi leak off kit which will be here on Tuesday. is there anything I can do in the mean time?
I have just done a leak test and the injectors are fine (not really the result I wanted).
I am willing to take parts of a different MK4, if its a fuel/air mix problem what parts are best swapping?
Tomorrow morning I will swap the injectors and the maf.
someone has said:-
"the throttle stop valve also opens and closes in relation to the accelerator pedal and if its not working correctly it could cause the car to stall when you snap the throttle, the throttle valve is controlled by a vacuum hose connected to a vacuum control solenoid valve, i would check the vacuum hose between the two valves for leaks and swap the control valve with a known good one to see if that cures the problem"
Does this mean anything to you?
I have changed the MAF but still the same. I have noticed a oil leak coming from near the turbo at the back of the engine. Im still finding out where its coming from.
The he car is going to ford tomorrow, you said to get the KAM reset but do you know what other values can be reset?
right ive had the KAM reset but still the same. I have noticed this morning that with the car at idle the FRP is going up and down between 2000psi and 6000psi?
Hi again Brian.
right I'm in the middle of changing the fuel pump. I have locked the cam and crank and removed the cam belt and the pump pully. I have removed the bracket at the back of the pump but I can't access the 3 bolts at the front of the pump which holds it onto the engine case. On where the pully was I have 3 big hole and then round the edge I have 3 smaller one but they dont line up with the bolts on the pump?
the 4 bolts torx bolts that hold the pump to the inner pulley are they accessible though the large holes on the metal thing that the pulley bolts onto?
Yeah that souns about right as I can see a big nut in the middle I will try that now
Perfect. I have ordered another one for delivery tomorrow. Will let you know how I get on
good on news is I have changed the fuel pump and the car is running.
bad news is it's just like before and stalls.
can you think of anything else.