2000 5.4L engine miss, no CEL
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Mountain Pass
Joined: Sep 2010
Posts: 168
Likes: 9
From: Nashville, TN
2000 5.4L engine miss, no CEL
Hi everyone, 2000 w/5.4L, 350K miles, developed a miss at low speed and under a load. I've had this problem 3 other times, every time it was a coil. I've used an OBD scanner (also had it scanned at Advance Auto), no code shows on the scanner, no misfire shows on the scanner, no CEL on dash.
Any thoughts on how to diagnose this? I'm figuring it's another coil, I could take it to my mechanic who I'm sure can deal with it, but money's tight as ever, so I'm trying DIY for the moment.
I could drive it and see if I can trigger the light, I hate to do that to the motor. If I drive highway speed with OD out, it runs pretty well.
as always, help is appreciated.
Ben
Any thoughts on how to diagnose this? I'm figuring it's another coil, I could take it to my mechanic who I'm sure can deal with it, but money's tight as ever, so I'm trying DIY for the moment.
I could drive it and see if I can trigger the light, I hate to do that to the motor. If I drive highway speed with OD out, it runs pretty well.
as always, help is appreciated.
Ben
Cross-Country
Joined: Oct 2021
Posts: 60
Likes: 2
If you have more time than $$ maybe disconnect the connectors to a suspect coil & injector and see if you can repeat the miss. you have two coils you don't suspect? leaving six possible? if you start with the ones that are easy to reach and it drives the same as before with each one disabled could be worth continuing, if it runs really bad on each or just won't idle or drive I don't think there is any harm in it if only low speed/slight hill. double check this advice with some other sources though! the idea is that if the engine runs and then misses when you hit the hill and then you disconnect a different coil/injector and the miss isn't there you may have found your offender...
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Mountain Pass
Joined: Sep 2010
Posts: 168
Likes: 9
From: Nashville, TN
I need to double check my service records, but I'm fairly sure it's been less than 100K. The onset of this problem was so sudden it seems to point to a coil. But I'm still driving it trying to force a code, but no luck so far.
Thank you or your response!
Thank you or your response!
Tuned
Joined: May 2010
Posts: 309
Likes: 1
From: Wilsonville,Oregon
You have a bad coil, or carbon build up on a spark plug
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
A failed COP initiates a DTC whereas a fouled spark plug might not be detectable without a suitable scanner.
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Lead Driver
Joined: May 2004
Posts: 5,018
Likes: 132
From: Maryville
I had this happen, drove around until 2 coils failed forcing me to get it fixed, had the plugs changed too, did all coils, turned out the spark plug wells for both failed coils had collected water in them at some point, could tell by the white powder from the aluminum intake on the boots showing how deep the water had gotten, never threw a code, I drove a year like that.
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Tuned
Joined: Dec 2009
Posts: 401
Likes: 20
Forget about pulling codes when static. My mechanic uses a scanner/code reader than is used when driving.It will tell in real time what is happening. I know it is expensive/its a Snap On. But it does the job the first time,no guessing.
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