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1993 Ford Ranger Spark Plug Analysis #5378607 03/17/20 12:12 PM
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spavel6 Offline OP
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I'm having random misses at idle when warm with no Check Engine light on a 1993 Ranger 4.0.

It also has intermittent tapping, which I believe is the pushrods/rockers, but I will be tackling this later.

I pulled the plugs, and found it interesting. The whole left bank is much more fouled than the right.

What do you guys think? Expert opinions needed!

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2003 VW Jetta Wagon TDI 198k M1 5W40 TDT
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Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378617 03/17/20 12:23 PM
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incognito_2u Offline
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Is that V6 in your 1993 Ranger "Transverse" mounted?


2006 Jeep Commander 3.7 V6 -116k (M1EP5W30/XG3600)
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Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378621 03/17/20 12:27 PM
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spavel6 Offline OP
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Longitudinal


2003 VW Jetta Wagon TDI 198k M1 5W40 TDT
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2001 VW Passat Wagon V6 4motion 110k PP 5W30
Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378625 03/17/20 12:32 PM
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Kira Offline
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How many miles on this '93?

Was the "waste spark" system used on that engine? They say incorrect spark plugs on one bank will take a beating due to the polarity of the spark.

However, "double platinum" is supposed to negate the imbalance. Did operation improve with the new plugs?

Bad valve seals on one bank? Perhaps head work on the other side years before?

Re: 1993 Ford Ranger Spark Plug Analysis [Re: Kira] #5378628 03/17/20 12:36 PM
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spavel6 Offline OP
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Originally Posted by Kira
How many miles on this '93?

Was the "waste spark" system used on that engine? They say incorrect spark plugs on one bank will take a beating due to the polarity of the spark.

However, "double platinum" is supposed to negate the imbalance. Did operation improve with the new plugs?

Bad valve seals on one bank? Perhaps head work on the other side years before?


Very little history on this vehicle, aside from the visual inspection. I just got this in a trade.

The engine I would guess has ~150k-200k on it.

Yes, it's better with the new plugs. However, I wonder if the skip will return shortly.

Also, I did pull a left-bank "lean" code with the old plugs. They were hand-tight, so I wondered if they were leaking compression causing the lean..

Last edited by spavel6; 03/17/20 12:37 PM.

2003 VW Jetta Wagon TDI 198k M1 5W40 TDT
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Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378682 03/17/20 01:39 PM
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meep Offline
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if anything, the lean bank looks healthy and the other bank looks like it's running rich.

Wonder if a PCV return or other waste line is feeding one side of the intake, though any waste fumes shouldn't cause anything so much as the difference shown.


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Re: 1993 Ford Ranger Spark Plug Analysis [Re: meep] #5378685 03/17/20 01:42 PM
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spavel6 Offline OP
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Originally Posted by meep
if anything, the lean bank looks healthy and the other bank looks like it's running rich.


My understanding is that Cyl 4,5,6 is the left bank (drivers side). Are you saying the sooty plugs are normal vs the very clean Cyl 1,2,3?


2003 VW Jetta Wagon TDI 198k M1 5W40 TDT
2001 VW GTI VR6 250k T6 5W40
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Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378702 03/17/20 02:07 PM
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Sticking my neck out a bit here but I think that the plugs were loose, could be the entire problem.

Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378760 03/17/20 03:15 PM
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Maybe the intake gasket is leaking on that side.

Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378795 03/17/20 03:47 PM
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Left side oxygen sensor is bad.


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Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378830 03/17/20 04:13 PM
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Kira Offline
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I've read that at 150-200K all the exhaust sensors should be changed. Look 'em up - they're cheap.

I'm with that finger tight thing. Run her sane for a bit. She might like it.

Be glad you didn't shoot a hole somewhere under the hood....or bang the heck out of the threads on the way out.

Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378878 03/17/20 05:01 PM
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I doubt that a 1993 ranger has separate o2 sensors for each bank

Does it burn or leak any oil op?

Re: 1993 Ford Ranger Spark Plug Analysis [Re: spavel6] #5378886 03/17/20 05:04 PM
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spavel6 Offline OP
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Doesn't appear to burn oil.

It has two O2 sensors, one on each side. I have ordered a new left sensor. Should be here by Friday.


2003 VW Jetta Wagon TDI 198k M1 5W40 TDT
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