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    Thread: hiccups and hesitation, backfiring in airbox

    1. 03-12-2012 11:33 AM #1
      I've replaced both fuel pumps ran the car on premium fuel with injector cleaner, cleaned the idle stabilizer valve, cleaned the throttle body, replaced spark plugs and wires, new air filter, new fuel pump fuse and relay. It has been sitting in my neighbor's yard 4 four years and he said it ran fine back then, after all the replacements i finally got the car to run, it runs great when you first start it, but after it warms up, the idle changes and goes up and down a lot, then when you push the gas it hesitates and the RPMs go down, after pumping the gas i can get the rpms up enough to drive it, it will backfire in the airbox and now there is oil showing up in the airbox and it smells really bad of gas. I have checked all of the vaccume tubes, there are no leaks and no blocks. I am completely stumped, any Ideas?

    2. 03-12-2012 02:50 PM #2
      i have the same problem trying to fix it now let me know if u find anything out

    3. Junior Member roscoe crawford's Avatar
      Join Date
      May 8th, 2011
      nampa, idaho. usa
      1989 cabby,1993 passat,2004 MKIV jetta
      03-21-2012 07:34 PM #3
      what year and have you checked fuel pressure? what type of fuel system cis cis-e also check throttle plate

    4. Junior Member pete1.8t's Avatar
      Join Date
      Apr 12th, 2007
      2001 Jetta wolfsburg, 2006 3.6 Passat, 2003 GTI.
      03-29-2012 05:40 PM #4
      Hey I've got something similar happening. My car hesitates real bad when the throttle pedal is pushed then all of a sudden it just takes off. It also back fires through me intake when the throttle is pressed down. I am thinking it has something to do with my combi valve (EGR valve) or maybe the combi valve controller. Maybe it is sticking open and all intake air is going straight out the exhaust.
      Could you please post what your findings are. I am having a heck of time trying to finding anything on this issue.

    5. Member armymech666's Avatar
      Join Date
      Sep 29th, 2007
      Duncannon, PA
      2001 jetta 1.8t, 1990 jetta 16v, 1982 Caddy Diesel
      04-03-2012 11:52 AM #5
      my girlfriends car was doing this and I replaced the knock sensor and fixed some vacuum leaks. the knock sensor was crumbling apart so I believe that was the main cause but I can't say for sure because that was a little while ago and I have a horrible memory.

    6. Member VR6witHRE's Avatar
      Join Date
      Mar 27th, 2008
      NY,NJ,Miami FL
      1997 Go Ped
      04-09-2012 08:36 AM #6
      any one figure this one out beside the knock sensor?

    7. 04-09-2012 10:20 AM #7
      my deal was my cis distributor .... got a rebuilt from german auto parts mad dough

    8. Member VR6 GLX Man's Avatar
      Join Date
      May 19th, 2008
      El Centro, CA
      1994/VW/JETTA/GLX 2014/Ford/FIESTA ST
      04-30-2012 06:19 PM #8
      I have a 92 gli, do you guys have these symtoms right when the check engine light comes on, my problems occur whenver the light comes on which is after I drive off. Sometimes it doesent do it for a lot of miles then other times it startes after I start driving off from a cold start.
      VRSociety #293

    9. Member jsvr6nsd's Avatar
      Join Date
      Jan 8th, 2007
      Phoenix, AZ
      '84 rabbit GTi, 2000 12v VR6 Jetta (wife's)
      05-05-2012 01:36 PM #9
      Have any of you guys check out your intake valves on your heads? If you car has higher mileage it is possible for valve springs to wear out and cause leaks which would cause backfire in the intake and the smell of gas also.

    10. Member team~bunny's Avatar
      Join Date
      May 15th, 2002
      bellbuckle, tn
      05-12-2012 09:38 AM #10
      If via check fuel pressure, then the fuel accumulater.

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