thanks for the info, Pickup Man. but i have aready done that. i got all the wire's where the diagram shows them to be.

 

Yep, replace the plug wire - I'd recommend a whole set, Motorcraft WR5934's are about 80 bucks from Rock Auto, aftermarkets are in the 50-60 buck range, just don't get Duralast from Autozone, those are junk. Make sure you use dielectric grease, don't shove the boots on dry.

 

I just went through this,

Plug wire on Cylinder 8 was bad, but it still fired the plug. I used an ohm meter on the wire and found it open, no electric going through. Yet when tested with the plug, the plug fired. Guess the electric was jumping the bad section of the wire.

I also recommend changing the wires and checking the old ones with an ohm meter.

 

first of all i would like to thank all you guys, for your and suggestions. they were very helpful in finding the problem. so here is the outcome i replace all the plugs ( motorcraft platinoms AGSF -32FM), i wanted Motorcraft WR5934's plug wires, but could not find them at any parts store around me. so i bought Autolite Professional Series, from Advanced Auto, they cost me about $85 bucks and the dielectric grease. anyways, the truck is running great, no misfiring, no blinking light, and no CEL at all. wow iam am so glad i came here first. i was going to take it to a shop and let them take a look. i can't imagine what they would of charged me. again thank you, i really appreciate you help. you guys are great.

 

That worked ! Well , Im shocked because my 98 was considered normal @ 170-175. The 4six has that much less than the 5four ? I'll check it out right now

Glad you gotter fixed tho

I'll report back with something to confirm those numbers.

 

hey jbrew, remember that i said (well for one that has 236,000 miles on it, that is). i know its not running like a new truck. but its running pretty good for a truck that has 236,000 miles. but thanks jbrew.

 

Yea, I know - But I have 253,000 on mine

Well , when I checked compresion it was around 230,000. Hang on, I'm up loading the chart from the Ford Service DVD - If it lets me steal it from the DVD that is, having troubles

 

Compression Test—Test Results

The indicated compression pressures are considered within specification if the lowest reading cylinder is within 75 percent of the highest reading. Refer to the Compression Pressure Limit Chart.




COMPRESSION PRESSURE LIMIT CHART

1048 kPa (152 PSI) 786 kPa (114 PSI) 1255 kPa (182 PSI) 936 kPa (136 PSI) 1462 kPa (212 PSI) 1089 kPa (158 PSI) 1669 kPa (242 PSI) 1248 kPa (181 PSI)
1062 kPa (154 PSI) 793 kPa (115 PSI) 1269 kPa (184 PSI) 952 kPa (138 PSI) 1476 kPa (214 PSI) 1103 kPa (160 PSI) 1682 kPa (244 PSI) 1262 kPa (183 PSI)
1076 kPa (156 PSI) 807 kPa (117 PSI) 1282 kPa (186 PSI) 965 kPa (140 PSI) 1489 kPa (216 PSI) 1117 kPa (162 PSI) 1696 kPa (246 PSI) 1269 kPa (184 PSI)
1089 kPa (158 PSI) 814 kPa (118 PSI) 1296 kPa (188 PSI) 972 kPa (141 PSI) 1503 kPa (218 PSI) 1124 kPa (163 PSI) 1710 kPa (248 PSI) 1202 kPa (186 PSI)
1103 kPa (160 PSI) 827 kPa (120 PSI) 1310 kPa (190 PSI) 979 kPa (142 PSI) 1517 kPa (220 PSI) 1138 kPa (165 PSI) 1724 kPa (250 PSI) 1289 kPa (187 PSI)
1110 kPa (161 PSI) 834 kPa (121 PSI) 1324 kPa (192 PSI) 993 kPa (144 PSI) 1631 kPa (222 PSI) 1145 kPa (166 PSI)


If one or more cylinders reads low, squirt approximately one tablespoon of clean engine oil meeting Ford specification WSS-M2C153-G on top of the pistons in the low-reading cylinders. Repeat the compression pressure check on these cylinders.


Compression Test—Interpreting Compression Readings

If compression improves considerably, piston rings are damaged.
If compression does not improve, valves are sticking or seating improperly.
If two adjacent cylinders indicate low compression pressures and squirting oil on piston does not increase compression, the head gasket may be leaking between cylinders. Engine oil and/or coolant in cylinders could result from this condition.
Use the Compression Pressure Limit Chart when checking cylinder compression so that the lowest reading is within 75 percent of the highest reading.


Cylinder Leakage Detection


When a cylinder produces a low reading, the use of Engine Cylinder Leak Detection/Air Pressurization Kit will be helpful in pinpointing the exact cause.
The leakage detector is inserted in the spark plug hole, the piston is brought up to dead center on the compression stroke and compressed air is admitted.
Once the combustion chamber is pressurized, a special gauge included in the kit will read the percentage of leakage. Leakage exceeding 20 percent is excessive.
While the air pressure is retained in the cylinder, listen for the hiss of escaping air.



Well , it didn't copy the chart right - But mannn, you are down there..

 

yeah i see what you mean, jbrew. i guess its times to start saving for a new motor. what do you guys recommend? where to buy it from?

 

i'd recommend through jasperengines.com or from ford that way you get all the updates done to the engine. or you can swap to a 5.4.

 

http://car-part.com/


Just type in your info and they find one close to the house for yuh. Best site for USED low mileage engines or transmissions IMO.

You can use any 97 -03 model 4.6L or 5.4L. Depending on what you get, there may be a few small modifications needed, nothing major. However, with a 5.4L, you need to aquire one that had the same trans behind it as yours = 4r70w auto.

 

BTW - Those chart readings are Minimum and Maximum - sidexside.

 

i hate to go with a used one though. you never know what your getting.

 

still jbrew, those # tell it all. i was wondering why i got such bad mpg's.

 

You roll the dice with remans as-well. Jasper is about the best (besides Ford istself).

But! Jasper has sent out bad ones too. A tech on this site who works for ford returned two Jasper engines that were bad - That's two in a row. So along with most everything else, you never know.

My 98 motor is a reman - Original blew @ 30k. Ford put another in it, remanufactured by ford. That's what has over 250,000 on it now. First motor blew because it had know oil in it after Ford serviced it. They forgot that part