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 High RPM missing
#674012
12/06/05 01:41 AM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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O-k...looking for some suggestions here. On the way home today I was cruising on the freeway when the ole monty started to miss. I slowed down and it runs fine untill about 2500-3000 rpm when it starts to miss. It only does it in 4th and 5th gear. I pulled the plugs to discover that #1 and #4 cylinder plugs had a "crust" on them. The other plugs looked fine. I checked the wires and all the connections on the coil. Everything checked out fine... What could cause this? <img src="/forums/images/graemlins/confused.gif" alt="" />
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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Re: High RPM missing
[Re: Roll_me_over]
#674013
12/06/05 07:30 AM
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Joined: Aug 2005
Posts: 34
Getting the Wheeling Fever
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when you say crust - describe it - what color?
Show me the muddy. . . .
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Re: High RPM missing
[Re: Roll_me_over]
#674014
12/06/05 05:00 PM
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Joined: Dec 2001
Posts: 11,727
Web Wheeler
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what did the 2 and 3 plug look like?
98 Montero with cold weather package
96 Toyota Land Cruiser, fully locked Mall Machine :-)
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Re: High RPM missing
[Re: LRJ4x4]
#674015
12/06/05 05:11 PM
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Joined: May 2001
Posts: 4,079
Roll Me Over
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The other plugs looked fine.
89 2 dr turbo diesel
89/88 "Backwoods sas"
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Re: High RPM missing
[Re: LRJ4x4]
#674016
12/06/05 09:57 PM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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when you say crust - describe it - what color? It was like a brownish color. And I'm not saying like a fine crust. It was pretty thick. Like between 1/16 and 1/8 of an inch for lack of a better way to describe it... what did the 2 and 3 plug look like? they had the normal light brownish look on the electrode insulator...
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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Re: High RPM missing
[Re: Roll_me_over]
#674017
12/06/05 11:35 PM
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Joined: Dec 2001
Posts: 11,727
Web Wheeler
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I assume your using all the same type and heat range of plugs <img src="/forums/images/graemlins/smile.gif" alt="" /> Anyways just change them out with some factory plugs NKG's and see what happens. Don't waste your $$$ on any of those fancy aftermarket ones.
The two inside plugs burn different than the outside due to the design of the intake manifold. How many miles on these plugs?
98 Montero with cold weather package
96 Toyota Land Cruiser, fully locked Mall Machine :-)
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Re: High RPM missing
[Re: LRJ4x4]
#674018
12/07/05 12:52 AM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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And what had the gap opened up to? My money is on .050.
Are the deposits dry crusty, or oily crusty? You might suspect a water leak at the base of the carb, fender side.
Not responsible for advice not taken...
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Re: High RPM missing
[Re: fasteddy]
#674019
12/07/05 07:00 AM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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plugs have maybe 10-15k on them and the gap was still at the correct setting. The crust was dry... As far as the missing, i changed the coil and the problem is solved...but the plugs have me baffled....
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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Re: High RPM missing
[Re: Roll_me_over]
#674020
12/08/05 05:12 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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Check all the head bolts for tightness. Pressure test the radiator and listen at the carb for the leak.
Not responsible for advice not taken...
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Re: High RPM missing
[Re: fasteddy]
#674021
12/09/05 06:19 AM
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Joined: Mar 2005
Posts: 381
OP
Mudrunner
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so a coolant leak may cause the plugs to build up deposits...hmmm...that could be it considering that small hose from the carb to the intake broke spewing coolant everywhere the other day...
02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time
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