Date registered: Nov 2012
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1976 W114 won't accelerate on hard acceleration and hills
Hello people! I'm Nate and brand new to the forum. First time Mercedes owner as of just over a month now. I can't be happier with my W114, but she is one high maintenance little girl.
I am need of some advice. I have had my 1976 W114 in the shop for the past 4 days for the same problem. It has even stumped my mechanic(Stu Ritters Mercedes). Great guy, seems to know his cars, but can't seem to find a solution to my problem. The problem is when I put the pedal to the floor the car will lose oil pressure and appear to die out. If I let off the gas oil pressure returns to normal, I then can give it gas and it will accelerate fine. There are actually three separate occasions in which this problem happens: 1)Hard acceleration 2)Coming out of a turn and gentle acceleration 3)Hills when coming out of either a dead stop or at a slow speed.
Here's what has been done: 1)Replaced fuel filter(gas is clean/tank is clean) 2)Ran a cleaner through the system(I'm not sure what he put in it) 3)Who knows what else he did to diagnose the problem, but we are without a solution
Information that may help. This is a California Emission 280 inline 6cyl, which means it has a lot of other emissions equipment on it. My mechanic said that it is more than likely either a catalytic converter problem or a carburetor problem. My feeling it's more carburetor than catalytic converter due to the problem occurring when accelerating out of a turn and when accelerating up a hill from a stop. Maybe I don't understand enough about my set-up, but I don't see a catalytic converter being the cause. But then again it could be getting the fuel it needs, but not the air. What are your thoughts?