1993 4.0, unkown problem - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-14-2011
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1993 4.0, unkown problem

I have a 1993 Ranger with the 4.0. I have never had a problem with it until a few days ago. The truck seems to start over fueling after it runs for a minute or two. It seems like there is oil mixed in but it smells mainly like fuel. It is smoking horribly with a white smoke after it has been running for a minute. IT is so bad that when I tried to drive it down the road it looked like I was fogging the area (it was at 7am so hopefully none of the neighbors realized it was me!). I normally pride myself on being able to fix my cars but this one has me stumped.

Here is what I know for sure:

The truck has 198,000 miles on it and this is the first major issue
It has been sitting for about 6 months without being started (I bought another truck and
was driving it.)
I did a compression check and all 6 cylinders are at 140 psi.
When I pulled the plugs there were a few that looked like they were ashy in color.
I replaced the plugs with new iridium plugs
There is water coming out the tailpipe when it runs (not coolant)
I replace the PCV Valve
There is no coolant in the oil
I did notice oil in the plenum but there was no oil in the PVC valve hose or the hose that
leads off the oil fill neck.
When I test drove it down the road it was lacking power
The check engine light is not coming on but does work

I am thinking about replacing the intake and plenum gaskets but wanted to make sure there isn't something else I need to be looking at before I go and put everything back together. I don't want to start replacing random parts so I am hoping someone has seen this before. Figures when I decide to start driving it to work again, something finally breaks.
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Old 05-14-2011
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****tty gas? If its been sitting for 6months....could be water in the fuel

Last edited by Timberwolf; 05-14-2011 at 06:36 AM.
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Old 05-14-2011
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Something else I noticed.....a lot of places are saying the truck takes copper plugs or the part number ends in P.....mine is AWSY-42PP. My understanding is that means double platinum. The parts house swears the new iridium plugs are better and better fuel efficiency because they fire hotter. Anyone heards anything about this?
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Old 05-14-2011
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Maybe a blow head gasket or cracked head or intake gaskets… sounds to me like a coolant leaking in to a cylinder or two.

Do you lose any power ?

Has your coolant level gone down ?

Just thinking out loud.

Water dripping from the tail pipe could be just condensation ?

No coolant in the oil just means the block is ok still could be a head gasket or head.
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Old 05-14-2011
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I thought about that but it ran on the same tank just fine before this. I used 1/4 of the tank before I parked it. Honestly, at 4.20 a gallon I am hesitant on draining the fuel and tossing it unless I can be sure.
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Old 05-14-2011
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There isn't any coolant in the oil, the exhause does not have that coolant smell, and no it's not losing coolant. I thought it was a bad valve seal but thought the compression would be off if it was. Plus it's only starts to smoke after a minute or two of running. Plus the truck starts right up.
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Old 05-14-2011
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Has it been in a garage or sitting outside? Did you add some fuel stabilizer when you let it sit for six months?
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Old 05-14-2011
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It was sitting outside and yes on the fuel stabilizer.
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Old 05-14-2011
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To me it sounds like a fuel thing. It smokes for two mins then clears and fires right up.......check your fuel filter....sediment could have been sucked up as it has been sitting for a bit. Hope it works out well for you man.

Last edited by Timberwolf; 05-14-2011 at 06:52 AM.
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Old 05-14-2011
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It's the opposite....it is fine for about two minutes then the smoke starts. It seems like there is a way to test the fuel so I'll look into that. But the oil in the plenum is one of the another symptoms.
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Old 05-14-2011
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the smoke just sounds like condensation to me...does it go away after the truck warms up?
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Old 05-14-2011
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No, it smokes really bad! I fogged the neighborhood this morning. I thought it was just residue or condensation and I took it around the block. Bad idea! Plus it smells of gas to the point I still smell it on me and in the house (yes the windows were closed) from an hour ago.
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Old 05-14-2011
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I did find an article saying the 93s had a problem with the fuel pressure regulators so when it stops raining I am going to check the pressure. After that I am tempted to replace the intake and plenum gaskets. They are $40.00 for a Felpro set.
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Old 05-14-2011
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water leaking outta the pipes could be from using ethonal gas or superunleaded or w/e thats just my first thought when i see that.
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Old 05-14-2011
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It has to be water in the gas. I would get rid of that tank of gas and get a new one and see if it goes away.
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Old 05-14-2011
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ok almost figured it out. It's either the fuel pressure regulator or an injector(s). When I was checking the pressure it would spike to 70 then drop to 0. I tried this several times and the same results each time. I noticed if I turned the key on then immediately off it spiked at 70 and slowly leaked down. If I turned the key on an left it on it suddenly dropped to 0. I also noticed something kept clicking irratically. since I think the regulator is vacuum regulated, that leaves the injectors. I am going to pull the plenum and try to figure out which one it is since they are $60 each.
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