My van is missing very bad-replaced plugs at 75,000 miles-currently 86,000 miles.The shop that replaced the plugs said there is a problem with the fuel injector wiring harness connectors?Is there a recall on this harness or a cheap fix or is it the coil on plugs problem?there are no current codes or check engine light on-is there a test on the coils that I can do?Might have to take it to the local ford dealer for fix-local guys can't seem to fix or want to retire on the fees for replacing all coils and fuel injector harness-can you give me an idea on fees and parts?Taking off doghouse is major job in a work van so need an easy solution-thanks!
Sounds like you have a dead ignition coil very common problem. to check the ignition coil and fuel injector harness without a scan tool you can use a noid light. it is a 12volt light bulb that connects to the harness side and flashes indicating that the computer is firing the injector and or coil. there is no specifications to check the ignition coils the best way is with a scan tool see witch cylinders have the most counts in the misfire history your local dealer may also be able to perform a cylinder balance test to find the dead hole. unfoutunatly you have to remove the doghouse to access the rear coils and fuel injectors.
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I would say to replace the sensor and see if it helps. I assume you had the truck scanned and that was the only problem. The speed sensors usually relate to the ABS and Transmission shift points.
Both Autozone and Oreillys will scan for FREE. After you replace the sensor, get a water spray bottle and go around all the seams you can find on the engine while it is running. If the RPM changes you have found the vacuum leak that is causing the miss.
There is also another test that can be done electrically. It is the cylinder balance test. This directly relates to the compression of each cylinder.
While all the Diagnostics that showed the fault are accurate, the onboard computer does not tell everything.
Usually it can miss the mechanical issues like a vacuum leak, or a bad valve in a cylinder that is firing good electrically without the whole bank running rich with the unburned fuel from that one cylinder. This is because it averages the total burn rate for each bank.
On the V8 engines there are cavities below the Airhorn for EGR flow. If your V10 is similar you may want to look under the Airhorn gasket and clean the cavities. It should only cost your time and a gasket.
I have a 99 ford E350 15 pass van with the V10 gas engine with 120,000 miles and auto trans. The engine was missing at speeds above 45 MPH. I took it to a repair shop for a tune up. They changed the spark plugs and charged me $520.00. Well now it misses at idle to 55 MPH. They made it worst! I'll eat my losses and will not deal with the repair shop as they are giving me the run around. Can anyone help me before i get ripped off again. My last resort is the Ford dealer but they are the biggest rip off in the world.
A very common proplem with this engine is the coil packs sit on top of the spark plugs with a approx 4 inch boot to the spark plug. Especially when there is wet weather moisture will get the the spark plug hole and when the vehicle gets up to temp the moisture will atomize and ground out the spark plug. Sometimes it will not even need to get hot and once it starts missing won't go away.
You will need to run a scan to determine which hole is misfiring. Then disconnect that coil and remove the one small bolt retaining itand pull it up out of the hole. Then take compressed air and blow out the bottom of the hole to dry it out. Re-install coil and your problem should have gone away. If you have a scanner sometimes just clearing the codes and the miss will go away. Be careful taking it to a shop as most shops will just sell you with the fact that you have a bad coil and have it fixed in the process of selling you and installing a new coil of hey maybe they will just blow it out and seeing as it's fixed you now buy into the fact that they replaced a "bad coil". That is not to say that sometimes it is just a bad coil and nothing else will fix it.
v8 triton is the same motor as the v10 with just 2 more cylinders so v10 or 5.4 same thing will apply.
What engine do you have?
I have a 2002 Escape with 3.0 V6. It sounds like the ignition is getting damp and the engine is misfiring. If the CEL is flashing, you really shouldn't be driving it. Check the owners manual, but you could damage the engine.
Anyway, go to an Autozone or other parts store. Many will scan your engine for the DTC code for free. This code will give you a clue.
My code was for a for a cylinder misfire. I was close to 100,000 miles, so I replaced the plugs first, then the one coil. It was the coil.