COP's replacement
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Junior User
Joined: Jan 2004
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From: North Chicago
COP's replacement
I have a '99 5.4L F150. Last week I had to have 1 of my COPs replaced, by the dealer that I bought my F150 at (a dodge dealer). My truck ran fine for a few days. Now my check engine light is back on and my truck is running the same way it did before the replacement. Which is very rough and shaky. It had a cylinder 4 misfire code.
Is there anything that has to be done after you replace a COP, like a timing check or anything like that. Because after the replacement it has been very hard to start and keep it running. It starts then idles really low (around 400 to 500) then will either jump up to normal ideling or die completly. What should I do or look for to get this fixed?
Is there anything that has to be done after you replace a COP, like a timing check or anything like that. Because after the replacement it has been very hard to start and keep it running. It starts then idles really low (around 400 to 500) then will either jump up to normal ideling or die completly. What should I do or look for to get this fixed?
Moderator
Joined: Dec 2001
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From: Louisville,Ky.
Sounds more like a vacuum leak. Maybe they knocked a hose off or something.
Could be the IAC going south too. (Idle Control Motor).
I would take it back and tell them that they didn't fix it and you want it right.
Is the check engine light on again?
Could be the IAC going south too. (Idle Control Motor).
I would take it back and tell them that they didn't fix it and you want it right.
Is the check engine light on again?
Senior User
Joined: Jun 2000
Posts: 188
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From: Half Moon Bay, CA
I JUST changed out my #8 COP, disconnected the battery to clear the comp and mine is still running like it was before I did the work... I pulled the plug to check it out and it was a little wet, but not too bad. Mine isn't completely dying, but its running like hell, real rough idle, vibration at speed, ect... Check engine light came back on too. I don't know what I should do now.... Help me out here fellas. Thanks,
Barry
Barry
Last edited by mcdev; Jan 22, 2004 at 03:31 PM.
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Junior User
Joined: Jan 2004
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From: North Chicago
The check engine light came back on. After they replaced the COP it ran good for a few days. but now that the weather is really cold, the truck is running really terrible. it shakes hard and it doent want to start.
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
The first thing to do is to get it scanned again and see what the code is now.
I agree with Lxman that they could have knocked a vacuum hose off or something.
If you had a dead COP it can easily kill the spark plug too. You might want to replace the plug on the cylinder with the failed COP.
After replacing the COP there isnt anything else to do. The timing etc on these isnt adjustable.
mcdev is your spark plug wet again after replacing the COP or only when you replaced it?
I agree with Lxman that they could have knocked a vacuum hose off or something.
If you had a dead COP it can easily kill the spark plug too. You might want to replace the plug on the cylinder with the failed COP.
After replacing the COP there isnt anything else to do. The timing etc on these isnt adjustable.
mcdev is your spark plug wet again after replacing the COP or only when you replaced it?
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Joined: Jan 2004
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I was getting a HARD code reading on #5 & 8 with 'key-on-engine-off', I found the problem was the connections between the COP and the spring. I removed the rubber boot from the COP and gently twisted and pulled the spring out of the COP. The connector inside the plastic housing was corroded/oxidized, probably caused by moisture and lack of a good tight fitting. I took some emory cloth and a small file and cleaned and sprayed them with a little electric contact cleaner. Next I slightly crushed the end of the spring to ensure a tighter fit.
I went through the rest of the COPs and found the same thing, even though they were not registering but were intermittent. Cleaned them up as well and now it runs great and I didn't need to purchase any new components
Might be worth pulling one of the easier COPs and inspecting it.
Good Luck
I went through the rest of the COPs and found the same thing, even though they were not registering but were intermittent. Cleaned them up as well and now it runs great and I didn't need to purchase any new components
Might be worth pulling one of the easier COPs and inspecting it.
Good Luck
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Junior User
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From: North Chicago
well I found out what was going on with my continual cylinder 4 misfire. apparently the heater bypass hose that is directly over top of cylinder 4 was dripping anti-frezze down on top of the COP. so all it took was to replace the COP and tighten up the hose clamp on that hose. thank god it didnt have a hole of tear in it.
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k, i guess i dont know what all the little parts are in this here ford ingine, i have a never ending issue with miss fires on my truck '97 F150 XLT 4X4 Off Road. I'll be the first, im not nice to it, but i love it, what the is a "COP" ? 4.6 V8 Auto new Tranny 151+ miles
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Coil Changeout
Does anyone have a service guide for changing out the coils and plugs I'd like to be able to do it myself if possible but need some direction. I've never changed out one and since the first one cost me $245 at the dealer I'd like to at least only have to pay for the parts next time.
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no i am going to hopefully put in Motorcraft plugs VERY SOON, i didnt find out before i put in split fires, they did well in my bronco II, so now that i know what plugs to put in, what wires should i use while im at it, i would like to go up from the stock wires. but not out ragous expense.
Hotshot
Joined: Aug 2002
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From: BC, Canada
Torb, for instructions on replacing your plugs and COPs you can check out https://www.ford-trucks.com/forums/s...2B%25252Bplugs
Unless you're sure that you have dead COPs I would just change the plugs first and go from there.
There was another thread recently too on replacing the COP boots to cure a miss rather than replacing the whole COP. If you do a search you should be able to find it.
Unless you're sure that you have dead COPs I would just change the plugs first and go from there.
There was another thread recently too on replacing the COP boots to cure a miss rather than replacing the whole COP. If you do a search you should be able to find it.
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