Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Driveability issues

(1990 BMW 535i)
in Federal Way, WA on April 28, 2009
I had the head gasket done proffessionally and the car still runs terrible no power feels like a rag stuffed in the tail pipe is this O2 sensors or catalytic converter. Also had the plugs changed and cleaned MAFS and throttle body
Ask a Question
2 answers & 0 comments
Popular Answer
I do not work on a lot of BMWs but it is quite possible that if the head gasket was previously blow that at that time the Oxygen sensor could have been damaged by antifreeze. It should be easy to check by looking at its out put pattern and response on an oscilloscope and or physically removing it and looking for signs of contamination.
You mention that it feels like a rag is stuffed up the exhaust, with a restricted catalytic converter when under full load you can often hear the exhaust gas sounding restricted and just trying to force its way out. A back pressure test of the exhaust system checks for excess pressure build up in the exhaust, also the cat will run hotter and may even glow red or smell.
I would check fuel pressure and fuel volume delivery to see that it is adequate.
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop
I do not work on a lot of BMWs but it is quite possible that if the head gasket was previously blow that at that time the Oxygen sensor could have been damaged by antifreeze. It should be easy to check by looking at its out put pattern and response on an oscilloscope and or physically removing it and looking for signs of contamination.
You mention that it feels like a rag is stuffed up the exhaust, with a restricted catalytic converter when under full load you can often hear the exhaust gas sounding restricted and just trying to force its way out. A back pressure test of the exhaust system checks for excess pressure build up in the exhaust, also the cat will run hotter and may even glow red or smell.
I would check fuel pressure and fuel volume delivery to see that it is adequate.
Sign in to reply
on September 09, 2009
check firing order
Sign in to reply

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
The dealer now has me doing a milage test but i need a second opinion before i call him with results
I have a 2007 toyota camry with 115611 miles on it the temperature gauge suddenly drops the tachometer goes crazy and...