Seafoam or MMO burn off ? How to know PCV valve

[MetalSlug]

Is Seafoam or MMO burn off ? and when to know PCV valve fail ?

When add to engine oil, I note seafoam burn off throught tail pipe over time, not big cloud of smoke, but a noteable. and tiny smoke when pull oil dipstick and oil turn darker after a few day driving.

How to know if PCV valve fail ? 5.0 mustang is over 100k miles , by the look of the pcv valve it look like its from ford factory, and the location of it, i cant reach it, so i guest preview owner never change it either, I order whole pcv valve kit from ford, come with pcv/grommet/and filter $35, it will be here friday, and i dont want to pull off the pcv and blow thru it, because the location of it, i rather pull if out and put in new one. I mabe have to ask my gf small hand to reach it, cause my big hand cant reach it

Clean TB other day and found oil on TB, and car got tiny smoke and look like oil. Found some tiny smoke when pull oil dipstick.

this is why I ask 2 question, is seafoam cause this smoke or bad pcv valve cause this smoke ? before any one say headgasket or valve seal the preview preview owner did GT40 head swap with new ford oem head gasket with ford oem valve seal, i have paper to proof it.

 

[chubbs1]

I would just go with your plan to change the PCV valve, since you are going to do it anyway it will possibly answer your question of where the smoke is coming from. I would bet it is the PCV valve, you will know soon enough.

Good luck MetalSlug


Chubbs

 

[Garak]

Yes, just change it as chubbs1 suggested. As I've mentioned in other threads, I've tried the suck and blow and shake and rattle methods of testing PCV valves. Some have passed, yet were still not working properly. The best example was the old F-150, a few years back. The oil was always milky (moisture, obviously), yet the trips were always at highway speeds and generally one hundred miles or more - there was zero short tripping. So, obviously the engine was getting up to temperatures (and the thermostat was fine). I checked the PCV valve; it passed my tests. I changed it anyhow with a new Motorcraft one. The milky business disappeared on my next long trip, never to return.

 

[MetalSlug]

Originally Posted By: Garak
Yes, just change it as chubbs1 suggested. As I've mentioned in other threads, I've tried the suck and blow and shake and rattle methods of testing PCV valves. Some have passed, yet were still not working properly. The best example was the old F-150, a few years back. The oil was always milky (moisture, obviously), yet the trips were always at highway speeds and generally one hundred miles or more - there was zero short tripping. So, obviously the engine was getting up to temperatures (and the thermostat was fine). I checked the PCV valve; it passed my tests. I changed it anyhow with a new Motorcraft one. The milky business disappeared on my next long trip, never to return.


Got a call from ford today, say all part is arried 1 day early , cant wait to install it on this weekend , its my weekend sunday driving , thanks for all the input, you guys have a wonderful day

 

[MetalSlug]

weather so nice today, my lunch break i gotta go home and swap my jeep for the mustang, let it warm up and drive to work. No smoke no smell, and I think because last time it smoke because it kinda cool out and ( car have full aftermarket exhaults and no cat and the condension burn off ) and i think the air filter was soak in a little bit of water because the hard raining we had early.

still gonna change out the pcv today.

 

[MetalSlug]

update : just take of old pcv, and it still rattle like new, but the filter under it is clog up pretty bad. replace it with all new motorcraft part, all went good, but gonna replace the hose pretty soon, cause it hard and crack. over all now it all good.

 

[Garak]

Originally Posted By: MetalSlug
replace it with all new motorcraft part, all went good, but gonna replace the hose pretty soon, cause it hard and crack. over all now it all good.


Good, good. My old one still rattled and all, but it certainly wasn't doing its job. Replacing the hoses can certainly be a good idea, too!