Already did a search but got multiple answers/opinions. If you install a breather cap is a chip needed? I would rather not void the warranty but I do want to keep oil out of where it shouldn't be

 

I went with the oil separater mod from REM. No pressure change. No leaning out.

 

can anything happen if you install a breather cap without retuning your chip? i just thought it stops oil from going into the plenum and TB...chris

 

The chip has to be retuned, it changes crankase pressure, it will cause a lean condition

 

IS THE CHIP MANDATORY FOR A BREATHER CAP? (not tryin to sound angry....just clearly statin my question )

 

Only if you don't want to get a check engine light because of a lean condition.

 

i installed a oil breather 2 days ago and i dont have a check engine light on. would my truck feel slower because of the lean condition? i have not had my chip retuned bevause i didnt know about that part of it .

 

Hey don't put a breather on without a chip I've only had one one since day one, almost a year ago without any lights.

 

let me clear my question up, If I am not running any chip at all, meaning my truck is stock, and I want to get an oil breather cap, do I have to first buy a chip? Or can I get the cap and continue without a chip?

 

Go with the oil separater mod, it won't change the pressure, you don't need a chip, and I heard the oil separater mod works better. When you drain the oil from the collection bottle you can pour it right back into the oil filler hole,

 

I used a breather without a chip with no problem and with a chip not burned for it. Put one in and find out...they're like $15.

 

1 st - I don't have a Lightning and I never tried a filter on my truck, so i've never tired this long term but,

a breather would cause the maf to not see the extra air entering the engine (unmetered airflow), the pcv allows the most flow at cruise, at idle its pulled up against a calibrated orfice (due to vacuum), durring wot or in the L's case boost it should be closed (which is a reason I think that oil is pushed back into the breather (intake elbo). (the reason it closes (pcv at wot) is that if there is an induction backfire it has a harder time to get into the crankcase)

(btw there are baffles on the insides of the valve covers, L shaped, maybe a better designe required ?, maybe due to the long cam chains the oil has greater airation?)

Durring idle and cruise the o2 sensors will adjust fuel trim to compensate (i suspect and tried on normal vehicles - non chiped) the problem that may happend (suspecting but no lightning so can't prove nor did i do a long test - just a 5 second test) is that the long term fuel trim will adapt for this lean condition at idle and durring cruise - however at wot the pcm goes into open loop operation (the pcm will then reli on long term fuel trim stratgies) but since the pcv system flows little or none at wot then the a/f ratio should be richer than normal at wot (just suspect).

Find that similar as to a failed maf sensor operates but oppostie - as a failed maf will run lean at wot and rich durring normal vehicle operation due to long term fuel trim. (generally speaking)

BTW i have no idea what chips do (well somewhat of an idea) but i do not know if they will still allow for lean codes (suspect that is changed from the factory set parameteres or there fuel trim adaptations, for all i know they could run in open loop all the time) so all of this is suspect of a stock pcm operation

 

O by the way to answer your question I'm going to try running one with the stock pcm but I will montior the fuel trims and sensor readings to see if what i asume is correct - the stock pcm should set a code if a problem occurs (i hope, but that is why i will monitor what happens)

I would however not try this whith a chip as there are way to many things that can be changed with a chip - some chips it maybe ok others it may not

- false air with maf can also cause drivabilty problems so the oil seperator line on the pcv line may still be the best way to go, just a pita to drain but i guess its gives a good excuse to look under the hood

- mind you if the seperator plugged up and allowed no or less flow than normal than the problem would be worse