Hello everyone, I've been having a problem with my vehicle recently. I just purchased it about 6 months ago and she was fine for about 3 months after date of purchase. Here are my cars details:
1997 Mercedes Benz
E320
I 3.2l
103.6k miles
When I place my car in drive and drive around, it is usually alright. Every once in a while (maybe once a day, per 4 hours of driving) when I approach a stoplight and stop, my tachometer will bounce between 250 and 1000 rpm. The bounce is so bad, it sounds like my car wants to die at the low side of the surge. It will surge roughly 1.5-2 times per second over the course of 10+ seconds creating this "wahh wahh wahh wahh wahh" until I either accelerate from the light, double foot the pedals to manually increase the fuel flow, or it solves itself (which I can't remember if it does).
When this problem started taking place, I would get a "check engine electronics" message. I began using process of elimination to replace parts that would cause this. Here is everything I've done in order of least to most recent:
tuneup (air filter, oil, oil filter)
front brake pads
trans tuneup (trans fluid, filter, pan gasket)
o2 sensor (upflow before cat)
maf sensor
spark plugs, cables, and coils (when doing this I accidentally broke then replaced a vacuum line)
alternator and fan belt
After replacing all of this, I still get the "check engine electronics" message on my dash HUD, and 4 intermittent fault codes that come and go, even after a clear:
p0300 - Random/multiple cylinder(s) -misfire detected
p0304 - Cylinder 4 -misfire detected
p0305 - Cylinder 5 -misfire detected
p0306 - Cylinder 6 -misfire detected
The things that still need looking at are my starter (it sometimes makes a buzzing/grinding noise upon starting), fuel injectors (I have a loss of hp from factory spec. Also on startup the car will start to turn over and shut off, then I have to remove the key and start the car again which takes a second then it will start). The fuel pump, which is external to the fuel tank, makes a semi-loud buzzing noise. I'm not sure if that's normal or if it's failing.
Then there are random aesthetic things that need to be addressed, but those are for AFTER the car runs like a top.
That's all the info I can think of needing at this time. Feel free to ask whatever you need, and also thanks in advance.
1997 Mercedes Benz
E320
I 3.2l
103.6k miles
When I place my car in drive and drive around, it is usually alright. Every once in a while (maybe once a day, per 4 hours of driving) when I approach a stoplight and stop, my tachometer will bounce between 250 and 1000 rpm. The bounce is so bad, it sounds like my car wants to die at the low side of the surge. It will surge roughly 1.5-2 times per second over the course of 10+ seconds creating this "wahh wahh wahh wahh wahh" until I either accelerate from the light, double foot the pedals to manually increase the fuel flow, or it solves itself (which I can't remember if it does).
When this problem started taking place, I would get a "check engine electronics" message. I began using process of elimination to replace parts that would cause this. Here is everything I've done in order of least to most recent:
tuneup (air filter, oil, oil filter)
front brake pads
trans tuneup (trans fluid, filter, pan gasket)
o2 sensor (upflow before cat)
maf sensor
spark plugs, cables, and coils (when doing this I accidentally broke then replaced a vacuum line)
alternator and fan belt
After replacing all of this, I still get the "check engine electronics" message on my dash HUD, and 4 intermittent fault codes that come and go, even after a clear:
p0300 - Random/multiple cylinder(s) -misfire detected
p0304 - Cylinder 4 -misfire detected
p0305 - Cylinder 5 -misfire detected
p0306 - Cylinder 6 -misfire detected
The things that still need looking at are my starter (it sometimes makes a buzzing/grinding noise upon starting), fuel injectors (I have a loss of hp from factory spec. Also on startup the car will start to turn over and shut off, then I have to remove the key and start the car again which takes a second then it will start). The fuel pump, which is external to the fuel tank, makes a semi-loud buzzing noise. I'm not sure if that's normal or if it's failing.
Then there are random aesthetic things that need to be addressed, but those are for AFTER the car runs like a top.
That's all the info I can think of needing at this time. Feel free to ask whatever you need, and also thanks in advance.