2001 Ford escape v-6 multiple cylinder miss. I know the fuel injection system is sefi however does it use asynchronous spray during cranking. Do all of the injectors spray at the same time when cranking
Scan for codes and check fule pressure low pressue causes miss
February, 4, 2013 AT 5:50 PM
No codes, fuel pressure good
February, 4, 2013 AT 5:58 PM
Fuel pressure shold be 35-65 psi key on engine off and when key is turned off hold pressure for 1 minute if not to this spec replace pump. Is still check plugs, wplug wires, for arcing an dlastly compression
February, 4, 2013 AT 6:21 PM
I just rebuilt this motor, new fuel pump, injectors have a good spray pattern, new plugs, have verified ignition system, compression is 200 Lbs. I have checked all grounds and all ignition and injector wiring from each injector connector and each coil connector to PCM with an ohm meter. All wiring is good. All grounds are good and connected per Ground distribution wiring diagram. The question was, all injectors spray at same time when cranking, is that correct.
February, 4, 2013 AT 8:03 PM
They are operated elecircally so yes is the answer. You really need to ifnd out why it's missing is why I answered like I did. Check your crank and cam sensors for resistance. That may be causing your misfire. Good luck
February, 4, 2013 AT 8:15 PM
It has a new crank sensor and a new camshaft sensor. I will try to clarify my response. I was previously a proffessional auto mechanic, however that was before MPFI. With that said I have checked all the normal stuff. The reason I am asking the question the way I asked it was because the fuel injection system on this engine is a sequential multiport system. Which means each individual injector sprays in time with each individual cylinder. However, some MPFI sequential injection systems when in start mode use asynchronous spray, which means in that circumstance only all injectors spray at the same time, but only in that instance. I understand they are controlled electrically, so are the coils and they do not fire all at the same time. To clarify my question, I am asking if all the injectors spray at the exact same time during cranking. I know they do not all fire at the same time when it is running. What I am trying to determine is if the PCM is faulty.
February, 4, 2013 AT 8:18 PM
What codes are yoyu getting if any you have to start there. If it ran ok prior to engien rebuild then something isn't hooked up right
February, 4, 2013 AT 8:37 PM
I do not want to be rude and I doI appreciate your time, However it seems to me that you evidently you do not kniow the answer to my specific question, because you keep trying to tell me how to diagnose the problem. It has no codes. I understand in order for a gasoline engine to run properly it needs air, fuel, compression, spark and to have all of them in the correct timing. With that said, the following things have been verified, It has 210 lbs. Of cylinder compression, the valve train is is in time, the crankshaft & camshaft sensors are new (I tried the old ones just to make sure the new ones were not bad) Every coil fires, all plugs are new and working, The air intake is clear and unobstructed, the intake and exhaust valves are operating properly. The fuel pump is new and has the correct flow and pressure. All wiring has been checked with an ohm meter for continuity between each connector and the PCM plug in. All ground wires have been verified per the ground distribution wiring diagram and with an ohm meter for continuity to gtound. Every injector is operating and has a good spray pattern. With the upper air intake off, when cranking the injectors all spray at the same time, not in time with the cylinders. I am trying to verify that this is not correct, If it is not correct, then I feel confident that the PCM needs replaced. I know it would be a very strange coincidence for the PCM to go bad, I understand the concept if it worked before I worked on it, it probably something else, however I feel confident that I have checked evrything else.
February, 4, 2013 AT 8:46 PM
Then repost the question if this was a donation question let me know i'll see that you get your money back. Part of the problem with cam sensor si s they can be put out of time when newly installed and by a few degrees and you need a spro type scanner to correct this. As far as your injectiors go your colant sensor is sensing a cold engien so it is spraying extra fuel to compensate for no choke that is probably why you are seeing all of htem spraying. Have you tried a like pcm to seeif it cures the problem? I can offer nothing further. Sorry.
February, 4, 2013 AT 9:04 PM
I don't have a like PCM, that was why I was trying to find out about the injectors all spraying at the same time. I did donate, however I do not want a refund, you did spend your time trying to help. Again
Thanks for your time.