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could the pcv valve be causing this?

This is a discussion on could the pcv valve be causing this? within the General Help forums, part of the LSx Technical Help Section category; Lately I've been noticing a studder in my car from when I go from 1st to 4th(skip shift). The car ...

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    Member 4thGenTA's Avatar
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    could the pcv valve be causing this?

    Lately I've been noticing a studder in my car from when I go from 1st to 4th(skip shift). The car will hesitate for a bit until the rpms pick up a bit. At full throttle it does not do this at all, only at low rpms when I add some gas to it...Just wondering what it could be, any suggestions?

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    Senior Member tatertot91's Avatar
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    When is the last time the car had a tune up?
    (plugs, wires, fuel filter, cleaned MAF)

    Could be a vaccum leak but hard to tell
    can you hear anything under the hood?

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    Member 4thGenTA's Avatar
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    changed fuel filter, plugs and wires about a year ago. Cleaned mass air flow about a week ago....I just went out to go look inside the car, i oil residue accumulated around the pcv hose, couldn't hear any leaks though. Does that mean there is a leak?
    I have lt headers with ory pipe, and air lid. Haven't got a tune yet, its on my to do list

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    Senior Member tatertot91's Avatar
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    Are you sure the residue isn't just from a dirty engine bay? if not it's very possible you have a leak

    spray some carb cleaner around your hoses, you may see a change in idle which would mean a leak. There is a y behind the intake that breaks down with time, that could be it as well

    edit: how does the car run at idle?

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    car runs smooth at idle, i dont notice any hesitation or rough idle.

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    Senior Member tatertot91's Avatar
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    what rpm does it idle at? could be just a hair high but still run smooth if you have a leak
    If i were you i'd try the carb cleaner or something similar and see if your idle jumps at all. If you had a leak and it wasn't large enough to cause a rough or noticeable idle issue, i'm not sure it would cause hesitation when driving though

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    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by 4thGenTA View Post
    Lately I've been noticing a studder in my car from when I go from 1st to 4th(skip shift). The car will hesitate for a bit until the rpms pick up a bit. At full throttle it does not do this at all, only at low rpms when I add some gas to it...Just wondering what it could be, any suggestions?
    How low of RPM's?

    If your trying to gas it at <500 RPM, I would assume this to be normal.

    I'd also suggest going to radio shack and score a resistor to eliminate the skip shift, such an annoying feature.

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    Spaz is My Mentor SMWS6TA's Avatar
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    OP, you might as well change your PCV. They need changed regularly like spark plugs and filters. Be careful removing it from the garment it is in. It is like they are design to break on purpose so you will have to buy the $100 tubing. Don't!! There is a fix that you can do for about $6. I am having to do this because I was replacing mine this weekend and it just fell apart.

    Here is the thread.
    PCV Valve Recommendation / Housing Modification

    In regards to your original question, what rpms are you shifting at to do the skip shift? Below 1500 and you'll stall. about 2k it shift fine. But do yourself a favor by either do the resister mod or get Frost to tune it out.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    Horsepower never lies, but is often lied about!

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    Member 4thGenTA's Avatar
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    i notice the hesitation when it skip shifts from 1st to 4th at about 1500 rpm, and I also noticed it hesitates when I add gas when cruising around 60-65mph at 1500rpm in 6th gear.

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    Spaz is My Mentor SMWS6TA's Avatar
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    is this all the time I mean over several tanks of gas at different stations? Do you always get your gas at the same place always and same type? Could be you need to run some injector cleaner. Also not having a tune with the headers can make the car run a little sluggish. I believe it runs rich at low rpms and lean on WOT. PM Frost (Resident tuner.) Full disclosure - I have his tune and it really brings our cars alive. I'm starting to think you have a tuning issue. PCV leak needs to be addressed but it's sounding a lot more like tuning issue.

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    Member 4thGenTA's Avatar
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    Okay, ill send my pcm to frost, might as well fix the little things while i wait too, I use shell gas, and used injector cleaner too.

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