2003 1.8T RPM surging between 1200-1800

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  1. #1
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    2003 1.8T RPM surging between 1200-1800

    I've recently been experiencing surging of about 100 rpms ONLY when under light acceleration between 1200 and 1800 rpm. Car accelerates from a stop fine, accelerates fine above 2000 rpm, and cruises fine at speed where rpms are above 2000. As others have experienced, this only happens once the engine is warm.

    Created a new post because no one seemed to ever confirm a solution. Considering starting with the MAF sensor. Have read maybe ignition coils need to be replaced? Spark plugs? TCM? No check engine/dash warning lights on.

    What to do?? Any insight appreciated.

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  3. #2
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    first check for vacuum leaks ,broken dipstick fitting , PCV elbow below and behind thermostat housing, rubber elbows coming off PCV check valve and valve cover etc. and check turbo hoses (inlets and outlets) tears,holes etc. how many miles? and owners?, any service records to speak of ?

  4. #3
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    110,000 miles, third owner. First owner was suburban Jersey family that had all work done by dealer. Second owner was their son that lived in Brooklyn and barely drove the car for about three years. Carfax and lots of receipts for service.

    The issue began after I had done a reverse flush of the heater core. Maybe I knocked a hose loose? Will take a look tomorrow at all you have recommended.

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  6. #4
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    Just a hunch... feel the underside of the "L" hose that's sort of under the coolant tank. It sees a lot of fuel--mine was essentially split almost end-to-end. It amounts to a vacuum leak.

  7. #5
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    I had had this issue also. I had a number of split hoses. I deleted the whole PCV system and just connected up brake booster to manifold with check valve and installed a catch can. Car has never ran so good and no more oil smell. Id also give the throttle body and MAF a clean too.

  8. #6
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    I had had this issue also. I had a number of split hoses. I deleted the whole PCV system and just connected up brake booster to manifold with check valve and installed a catch can. Car has never ran so good and no more oil smell. Id also give the throttle body and MAF a clean too.
    Still surging... @Kempy, any resources for showing what you mean by "deleted the whole PVC system"?

  9. #7
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    Quote Originally Posted by Kempy View Post
    I had had this issue also. I had a number of split hoses. I deleted the whole PCV system and just connected up brake booster to manifold with check valve and installed a catch can. Car has never ran so good and no more oil smell. Id also give the throttle body and MAF a clean too.
    I would strongly suggest against deleting the PCV system. I'm assuming this is for a 1.8t. With a properly serviced PCV system, the car will run well, and you won't smell oil. It will protect your engine from the sludge build up.

  10. #8
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    Quote Originally Posted by Kempy View Post
    I had had this issue also. I had a number of split hoses. I deleted the whole PCV system and just connected up brake booster to manifold with check valve and installed a catch can. Car has never ran so good and no more oil smell. Id also give the throttle body and MAF a clean too.
    I would strongly suggest against deleting the PCV system. I'm assuming this is for a 1.8t. With a properly serviced PCV system, the car will run well, and you won't smell oil. It will protect your engine from the sludge build up.
    I guess I'm just looking for resources for what includes the PVC system so I can look for leaks. Yes, 1.8t and engine runs fantastic other than the surging of the odometer when warm between 1200-1800 rpm. No oil smell as well.

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