engine misfire/sputter
03-19-2008, 02:33 PM
#12
Thread Starter
Join Date: Dec 2006
Location:
Posts: 33
RE: engine misfire/sputter
As I stated in the beginning, I have eight new COPs and new plugs. I did clean the MAF. I took my car to the shop today for the dianostic. I found that I had two bad COPs. #2 and #4. Yes, theyare BRAND NEW. I replaced them myself directly out of the box.The guy at the shop has been working on Fords for twenty years. He checked everything including the injectors. #4 had over 400 misfires and #2 had 81 misfires. As the mechanic stated when I picked my car up,"I see a fairly low number of Ford COPs defective directly from the company". So keep that in mind when replacing your COPs and you still encounter a misfire. It's a good thing I did not throw away those old COPs. I need to go home and find two good COPs to replace the two bad while I send these back to the store. Which brings me to this question, Does antone know how to test COPs off the vehicle? I was told there is a way to hook them up to a machine and check the ohms. I will call Autozone. Thanks!
03-19-2008, 10:27 PM
#15
2nd Gear Member
Join Date: Jan 2008
Location:
Posts: 213
RE: engine misfire/sputter
ORIGINAL: mystangg99
As I stated in the beginning, I have eight new COPs and new plugs. I did clean the MAF. I took my car to the shop today for the dianostic. I found that I had two bad COPs. #2 and #4. Yes, theyare BRAND NEW. I replaced them myself directly out of the box.The guy at the shop has been working on Fords for twenty years. He checked everything including the injectors. #4 had over 400 misfires and #2 had 81 misfires. As the mechanic stated when I picked my car up,"I see a fairly low number of Ford COPs defective directly from the company". So keep that in mind when replacing your COPs and you still encounter a misfire. It's a good thing I did not throw away those old COPs. I need to go home and find two good COPs to replace the two bad while I send these back to the store. Which brings me to this question, Does antone know how to test COPs off the vehicle? I was told there is a way to hook them up to a machine and check the ohms. I will call Autozone. Thanks!
As I stated in the beginning, I have eight new COPs and new plugs. I did clean the MAF. I took my car to the shop today for the dianostic. I found that I had two bad COPs. #2 and #4. Yes, theyare BRAND NEW. I replaced them myself directly out of the box.The guy at the shop has been working on Fords for twenty years. He checked everything including the injectors. #4 had over 400 misfires and #2 had 81 misfires. As the mechanic stated when I picked my car up,"I see a fairly low number of Ford COPs defective directly from the company". So keep that in mind when replacing your COPs and you still encounter a misfire. It's a good thing I did not throw away those old COPs. I need to go home and find two good COPs to replace the two bad while I send these back to the store. Which brings me to this question, Does antone know how to test COPs off the vehicle? I was told there is a way to hook them up to a machine and check the ohms. I will call Autozone. Thanks!
Also you can remove a spark plug, connect it to the COP, touch the electrode to a ground. Make sure you disconnect the injector for the cylinder you're working on. Then crank or start the engine. Then look for spark.
If all else fails, check out my post above ^^ and get a new calibration on your PCM at the dealer, per TSB 01-01-09, $80 (maybe you can talk him down). The tech at the dealer i went to said the same thing, the COP has failed on 2 cylinders.
COPs don't often fail... the dealer sends them back after warranty repairs only to have the supplier find that there is nothing wrong. The real cuprit is an improper A/F mixture, causing a misfire, because the PCM isn't doing a good job of adjusting the A/F ratio to current conditions. I think thats your issue bro... that was the issue on my car and since the new cal it runs great all the time.
03-20-2008, 01:55 PM
#16
1st Gear Member
Join Date: Jul 2007
Location: Florida
Posts: 76
RE: engine misfire/sputter
ORIGINAL: ottos
If all else fails, check out my post above ^^ and get a new calibration on your PCM at the dealer, per TSB 01-01-09, $80 (maybe you can talk him down). The tech at the dealer i went to said the same thing, the COP has failed on 2 cylinders.
If all else fails, check out my post above ^^ and get a new calibration on your PCM at the dealer, per TSB 01-01-09, $80 (maybe you can talk him down). The tech at the dealer i went to said the same thing, the COP has failed on 2 cylinders.
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