Quote:
Originally Posted by 97 SL320
Why was the head gasket replaced by the previous owner?
Since compression is low on all cylinders, valve timing may be incorrect ( check camshaft and timing chain ) Also check valve lash , it may be too tight. This still matters on a engine with hydraulic lifters / hydraulic lash adjusters. Hydraulic adjusters still need to be operated in their proper range otherwise the valves can be heald open.
Does the car have a catalytic converter? It may be restricted.
A oxygen sensor ( lambda sensor , o2 ) generally does not have enough control to make the car run that badly. O2 sensors are more to trim fuel mixture.
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This guy I buy the car from bought it with a supposed head gasket failure so he replaced it. Im starting to lean towards blocked cats or fuel starvation. Going to try tomorrow to use start spray as extra fuel to check if it gives more power. If not I'm going to disconnect the exhaust from the headers to rule out the cats. Then I'm going to put some 40 litres of fresh gas as the gas that is in the tank may be some months old and the fuel light just went on. Doublechecking compression and valve clearance will be next after that. There is not going to be much left to test soon.. But I will post my solution when I find it. I'm not giving up, it's 2am now and I've been working on it for a few hours now.