[saleen351]

2000 e320 wagon
There is a misfire and engine shaking pretty bad. When you are on highway, you sometimes feel the full power comes to life. It goes on and off. Also there seems to be a small exhaust leak somewhere under your feet on your driver seat or close to engine bay. Reader says P0300, P0302 and P0303. Where should i check first? Could it be cats because there is a leak on the exhaust pipe somewhere or could it be something very simple like wire, plug or ignition coil?
Thank You


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[fabbrisd1]

I would suggest it's a good time to check the cats - front cat running IR thermometer reading of exit temp at the back of the front cat should be significantly higher than entrance temp - then do a rubber mallet test of front and rear cat - if rear cat has significant pieces trapped there - do a forum search can be cut/emptied/cleaned/reinstalled..

 

[saleen351]

I would suggest it's a good time to check the cats - front cat running IR thermometer reading of exit temp at the back of the front cat should be significantly higher than entrance temp - then do a rubber mallet test of front and rear cat - if rear cat has significant pieces trapped there - do a forum search can be cut/emptied/cleaned/reinstalled..

There is a big possibility of cat failure because of the mileage. It has 200k even its in great shape. If i empty the cats, do you think that i will have problem with oxygen sensors? Will they still measure right data or will engine just run richer?
Thanks


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[Patch's]

2000 e320 wagon
There is a misfire and engine shaking pretty bad. When you are on highway, you sometimes feel the full power comes to life. It goes on and off. l?

After the cats have been checked, check the harness for the coil packs left side.

 

[saleen351]

2000 e320 wagon

There is a misfire and engine shaking pretty bad. When you are on highway, you sometimes feel the full power comes to life. It goes on and off. l?



After the cats have been checked, check the harness for the coil packs left side.

Cats checked ok today. Replaced the plugs and still have the problem. Found out that two coils were bad even though i suspected injectors also. I replaced the coils and engine runs like a swiss watch.
Thanks for all the help.


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[Patch's]

Yup, what I suspected, the 300 was why. Sometimes they will work fine cold, but as they heat up... And your right the injectors can do the same thing.
Expect to do the the rest sooner or later.
Glad to hear you fixed it
Patch