Tiguan :: Misfiring On Cold Start - RPM Goes To 1100 And Engine Works Hard


Sep 16, 2014

For last 3 months I have faced to a problem. My 2009 2.0 TSI, misfiring in cold start (in Summer!). When engine is cold (particularly in the mornings) in FIRST start, RPM goes to 1100 and engine works hard and car badly shakes. If I continue, engine light flashes. But if I just after first start, turn off the engine and restart it again, RPM comes back below 1000 and engine works well!!.

During first start a strange noise comes from the below of the car (Check...check...check...) but in second start everything is OK.

KM is 100k. I red the code and it usually shows P0302 (Misfire in cyl 2) and sometimes P0301 and P0300. I recently change all spark plugs (ngk) but problem had started before sparks change.

I switched the coils to see if misfiring follows the coil but negative.

I know it can have different reasons, PCV, carbon build up, EGR,..... but as it goes just after SECOND start I think it should be an electrical problem.

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I have Golf MK4 1.6 16V BCB '02 and problem while engine is running on idle. Engine works at 1100 rpm (doesn't matter is it cold or warm engine) all the time.

Dashboard turns CHECK ENGINE and EPC lamps and says : "engine workshop". At the beggining of problem VAG-COM diagnostic found this error:

17953 - Throttle Valve Controller: Malfunction

P1545 - 35-10 - - - Intermittent

But after I've changed my old throttle body with new one VAG-COM diagnostic haven't reported any error (no permanent error) and idle issue stays.

While engine is running and Check engine and EPC lapms are turned on diagnostic reports this error:

17961 Barometric/Manifold pressure signals: Implausible Correlation

P1553-35-10 ----Intermittent

After engine is turned off diagnostic doesn't report any error!

Beside of changing throttle body, I've changed ECM, MAP sensor, temperature sensor, EGR valve, . Also checked intake manifold and hoses if is it leaky (doesn't leak anywhere), and timing belt is ok and checked complete wiring installation!!!

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