Changed Plugs.... Now chugging
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Freshman User
Joined: Oct 2007
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From: Colorado
Changed Plugs.... Now chugging
Changed the plugs and boots on my 01 excursion yesterday. Truck has 80k on it and had a small mis-fire at around 1700 rpm, so I figured i'd do plugs and coil boots. Was alot easier than i thought it would be..... By the way, dealer said torque specs for plugs was 11 ft lbs. but i torqued them to 20....
Now truck Has no mis-fire at 1700, but is mildling "chugging" from a takeoff. Almost feels like an injector. Any ideas before i Tear it apart again?
Now truck Has no mis-fire at 1700, but is mildling "chugging" from a takeoff. Almost feels like an injector. Any ideas before i Tear it apart again?
Tuned
Joined: Sep 2002
Posts: 408
Likes: 11
From: saline USA
It might be a coil or a bad boot. Wait until it becomes a real full blown miss on that cylinder and then go around unplugging each coil until the one you unplug does not change the way it is running, that will be the one with the bad coil or boot. New coil at O'Reilly for $50 with lifetime warranty with boot. Boots there are cheap too, good quality
Andrew.
Andrew.
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From: Colorado
OK, chugging got worse and now has a very noticable mis-fire at most low rpm speeds. So i changed the plugs, Again, thinking maybe a fouled plug. New plugs but the same result.........I guess now i'll do 10 new coils. Any Ideas would be apreciated
Thanks
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Lead Driver
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From: Gilbert
Go buy one coil and switch them out with the new one until you find where it runs correctly. 10 new coils is big $$$.
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From: S CAL
Originally Posted by jeepthing
OK, chugging got worse and now has a very noticable mis-fire at most low rpm speeds. So i changed the plugs, Again, thinking maybe a fouled plug. New plugs but the same result.........I guess now i'll do 10 new coils. Any Ideas would be apreciated
Thanks
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I know you know something about computers because you are here on this forum and I know that you are mechanical because you changed your own plugs. On ebay you can find can bus readers for less than 100 bucks and they are really simple to use. The plug is right there under the dash on the drives side and is really easy to get to. The can bus reader is just another tool just like a torque wrench or any other tool you would buy. The nice thing is the can bus reader will actually tell you which cylinder is doing the missing from the code that you retrieve. Then you only have to figure out what is wrong with just that cylinder and not all 10 of them.
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From: Colorado
$125 bucks later and she running like a champ. Verdict: Bad COP cly# 1. There was NO stored memory of mis-fire, so cheap autozone scanner, nor very expensive snap-on scanner told me which coil was bad. So a $75 diagnostics and a $50 cop got me back on the road
Elder User
Joined: Sep 2007
Posts: 803
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From: S CAL
Originally Posted by jeepthing
$125 bucks later and she running like a champ. Verdict: Bad COP cly# 1. There was NO stored memory of mis-fire, so cheap autozone scanner, nor very expensive snap-on scanner told me which coil was bad. So a $75 diagnostics and a $50 cop got me back on the road
Thanks for the feedback but I am surprised it never stored a code. I guess the miss was not bad enough for the crankshaft position sensor to pick it up. That is good to know.
Tuned
Joined: Sep 2002
Posts: 408
Likes: 11
From: saline USA
Like I said, you can go around with the engine running and unplug each coil until it runs just the same with the coil disconnected and missing, this is the one that is acting up. No need for computer plug ins. As long as it is missing pretty consistently you can do this in minutes and go buy the coil. I have gone through two of them.
The Scan gauge I bought recently does tell me which cylinder has a miss on it and a whole bunch of other cool information for 159 bucks.
Andrew
The Scan gauge I bought recently does tell me which cylinder has a miss on it and a whole bunch of other cool information for 159 bucks.
Andrew
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