not sure if it would make it that bad. I mean if it read that the exhaust was way too rich or lean it might try to dump fuel or lean the mixture. Dirty MAF possibly too? Without the codes it’s kinda hard to say. If you need it scanned I’m in Brentwood and finally got the cable and software to at least see what it says and clear it.
I don’t think a coolant temp sensor (the green sensor you mentioned in the first post) would cause it to buck on cold start.
spangs… i’m going to guess that if its’ a common studder and never runs right, it’s a coilpack… buy one and let the car idle studder, pull them one at a time and the one you pull out that doesn’t kill the car or make it worse, is the bad coil. I have some in my glovebox (lol, what a shame) so you can always borrow one.
if it’s truly a vac leak, check right off the valve cover… they are known to suck.
get some ether or something, spray around the rubber hoses and listen for engine fluctuation… that’ll be the leak… i’m sure you know that. also, under the intake mani is totally an issue!!! mine was shot a few months back
get it scanned if it drives… they can see the manifold pressue… should be about negative 22 to negative 18… or 18-22 hg/in
so… does it ever clear up? does it sound like it’s on 3 cylinders?
i’d bet coils… vac leak will typically subside if you rev it up… does it rev up choppy or does it rev up solid?
it prob is coils…i replaced two and like a dumbass didnt replace them all…
its seem choppy…and i was having the same issue and then the coild fiannly went and ran reall really bad replaced and worked so it might be one of the other two going bad…
it woudl throw a misfire for sure… does it have multiple codes? if not, that’s the first time on a vw that i’ve seen that! can you read multiples? i can scan it for you if you cant spangs…
front O2 would cause the car to suck at idle on startup…
spangs… bring that shit to snewton… nothing but german guys there lol
i’m in the north… but we can hookup.
listen man… if it gets ‘better’ than its’ just closed loop front O2 crisis… i’d get a new wideband front o2 sensor and try it out… sucks because they are pricey new.
vaccum would be an issue the whole time, but during revs would save it’s face… however after dropping back to idle it’ll die out… so chances are if it’s just cold startup when it’s really bad, that would lead me to the o2 sensor… sucks man!
see if the code says b1s1 or b1s2… for bank one sensor one or two
lol