2.9l v6 oil problem
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2.9l v6 oil problem
My 1989 ford ranger with a 2.9l V6 has an oil problem. The oil thins really quick and has a gas smell to it. The truck runs bad after the oil warms up. when I change the oil it runs fine until the oil thins again. The oil pressure will change throughout driving but stays around normal. This is the second motor that has done this.Could it be the a gasket or the piston rings going bad?Any suggestions on what to do? Would it be better to rebuild the old motor or fix this one?
Last edited by problemranger; Nov 16, 2004 at 10:20 PM.
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Joined: Nov 2003
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From: ut
2.9's had a problem with heads cracking, but I would have thought most of these problems would have been worked out by now. One of my heads had a hairline crack (I couldn't see it until the machine shop pointed it out). The problem was the casting where the rocker shaft bolts on isn't beefy enough. Anyway...if the oil is thinning and perhaps a little foamy, it's probably antifreeze. Check your overflow bottle or radiator and see if you have a low level. My truck used about a overflow bottle size amount of antifreeze about once a month until I replaced the heads.
Hope this helps.
Hope this helps.
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Joined: Nov 2003
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From: ut
uh oh, I've not had this problem on any of my vehicles, but it sounds like you have an injector stuck open, or at least leaking. With your truck shut off, the pressurized fuel system will bleed off through the injector, running into the cylinder, and seeping past the rings into the oil pan. Over time this fuel will accumulate until it's noticable in your oil.
Like I said, I've not actually seen this problem...anyone out there verify my opinion?
If this is what the problem is, try some injector cleaner first...an easy fix if it works.
Like I said, I've not actually seen this problem...anyone out there verify my opinion?
If this is what the problem is, try some injector cleaner first...an easy fix if it works.
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Joined: Sep 2004
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From: Cloverdale, IN
Originally Posted by sjwoody
uh oh, I've not had this problem on any of my vehicles, but it sounds like you have an injector stuck open, or at least leaking. With your truck shut off, the pressurized fuel system will bleed off through the injector, running into the cylinder, and seeping past the rings into the oil pan. Over time this fuel will accumulate until it's noticable in your oil.
You can take an ohms reading on the injectors to see if one has a big difference compared to the other ones. I'm not sure what the ohms specifications should be.
You can also use a long handled screwdriver held up against each injector to see if you hear a clicking sound which would indicate it is working.
Post Fiend
Joined: Dec 2001
Posts: 10,562
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From: South Jersey
Run the truck for a few then shut it down and pull the vacuum line off the fuel pressure regulator and check for gas, common problem. Don't run it with gas in the oil except for test reasons.
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