Missing around 45 MPH
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Missing around 45 MPH
2000 V10 250 Lariat CC 83,000 miles
Have owned for a year. Drove on a 400 miles trip last weekend, ran beautifully.
Upon return home, filled up and parked ...Sunday night.
Today, have a miss @ 45 mph. Does not want to cut off, just poor idle and definite miss.
Any ideas? I have already checked the hose to the throttle body and
the COPs to see if loose. To my knowledge, plugs have never been changed.
Have owned for a year. Drove on a 400 miles trip last weekend, ran beautifully.
Upon return home, filled up and parked ...Sunday night.
Today, have a miss @ 45 mph. Does not want to cut off, just poor idle and definite miss.
Any ideas? I have already checked the hose to the throttle body and
the COPs to see if loose. To my knowledge, plugs have never been changed.
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From: Long Island USA
Get the misfire counters read, that'll tell you which (if any) cylinder is actually missing.
You'll need to go to Ford or a good mechanic (Autozone might know how, and it's free).
Then, get a new COP and put it on that cylinder and see if it makes a difference. If not, change the plug and try again. (Reason I say new COP is because moving that one COP to another cylinder and getting the misfires re-read could cost more than a new COP).
Or, once you know which cylinder it is, remove the COP and plug and make sure they are clean and not wet/dirty. If there's water or dirt down there, clean everything up, blow air down the hole to blow out the dirt BEFORE removing the plug, then loosen a full turn, and blow again.
art k.
You'll need to go to Ford or a good mechanic (Autozone might know how, and it's free).
Then, get a new COP and put it on that cylinder and see if it makes a difference. If not, change the plug and try again. (Reason I say new COP is because moving that one COP to another cylinder and getting the misfires re-read could cost more than a new COP).
Or, once you know which cylinder it is, remove the COP and plug and make sure they are clean and not wet/dirty. If there's water or dirt down there, clean everything up, blow air down the hole to blow out the dirt BEFORE removing the plug, then loosen a full turn, and blow again.
art k.
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From: Northwest Indiana
Ford hit me for $80 to run the test. They hook up the reader and take it for a test drive. If you have them by you, NAPA sells the COPs for a bit less than the dealerships.
At that milage, I'd think about replacing all of the spark plugs anyway, just for peace of mind.
At that milage, I'd think about replacing all of the spark plugs anyway, just for peace of mind.
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T Squared and krewat
Tried to self diagnose first ... using one COP .. no luck, still missing.
Took to Ford ... 2 COPs dead (figures), no wonder I could not locate
#2, #7 ... Ford replaced both and all plugs.
Thanks for the help .. The BEAST has awakened !!!!
Tried to self diagnose first ... using one COP .. no luck, still missing.
Took to Ford ... 2 COPs dead (figures), no wonder I could not locate
#2, #7 ... Ford replaced both and all plugs.
Thanks for the help .. The BEAST has awakened !!!!
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From: Long Island USA
Originally Posted by Thefordmann
is their any other way to test the coil over plug?
However, they are known to fail for thermal reasons - expansion and contraction will make or break the connection, so unless you heat the thing up to 200 degrees F, you'll never know if it's really faulty or not.
One other thing.
Every time I read the title to this thread "Missing around 45 MPH" I think "Torque Converter lockup clutch slipping".
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From: Lewisville, Texas
How exactly do you check it with the Ohm meter? What exactly am I looking for? What should the resistance be? I want to be sure my COP is bad before I put the new one on. My plug (not very old) does look bad, but beore I replace just it...I wanted to make sure my COP IS actually bad too. What stinks is that I've replaced both only about 1.5 years ago. Coil#4 and all 8 plugs. #4 is misfiring again...
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Like I said, compare a good one to the "bad" one...
However, chances are it's a heat-related thing, so unless you cool down and heat up the COP while testing it, you might not see any problems with it.
I'd switch that "bad" COP with a known good one and see if the misfire follows it, but then, unless you have your own scan tool, that's going to cost (although Autozone does it free).
However, chances are it's a heat-related thing, so unless you cool down and heat up the COP while testing it, you might not see any problems with it.
I'd switch that "bad" COP with a known good one and see if the misfire follows it, but then, unless you have your own scan tool, that's going to cost (although Autozone does it free).
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Missing on 3 cylindars
I'm missing on #3-6-8 cylindars I have a 2000 v10 I switched the coil packs on these cylindars with 3 other good ones and the same 3 cylindars are still missing according to my scan tool! Im going to get a set of ford sparkplugs and put some injector fluid through it, dose anyone else have any suggestions????
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From: Lewisville, Texas
UPDATE: I changed my #4 COP AGAIN...since last year. Only this time I checked better the heater hose running above it. I checked last year with my hand and thought it was tight. This time I put a little wrench in my palm and pushed on it and it spun right around and of course some antifreeze/coolant came out. Since I spun it aropund I tightened much more (putting a towel down below so it wouldn't drip/run out around the #4 cyl. Once finshed with the hose I put n a new plug and the new coil on #4 and have not had any miss since. It's been a week now. Oh...I ended up buying my COP from O'Reilly since they had a lifetime warrantly for $53 vs. no warranty on the $48 dollar one at Autozone, where I usually buy most things.