Mechanics

CAR RUNS ROUGH THEN RIDES NORMALLY AFTER I DRIVE FOR A WHILE.

2002 Volkswagen GTI • 138,000 miles

When I first start my car in the morning, I have a rough idle and a rough ride for a while and then the car lugs for a minute and then drives normal. There seems to be a rattling sound coming from near the Catalytic Converter or the exhaust tip. There is no funky sounds coming from the engine. I know that cleaning the Mass Airflow Sensor, replacing the air filter, checking the fuel pump and checking the catalytic converter are some options but doing all of them takes some time. Is there an easy diagnosis for this problem?
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Msmccorkle
September 1, 2011.



Check the exhaust for excessive backpressure -catalytic converter could be clogged-up

Rasmataz
Sep 1, 2011.
How do I test the exhaust for excessive backpressure? And if that is the cause of the problem, would that give me my power back and help stop the roughness of the ride and idle?

Tiny
Msmccorkle
Sep 1, 2011.
Remove the oxygen sensor and hook on a pressure gauge or have an emssion station check it with a 5 gas analyzer

Rasmataz
Sep 1, 2011.