99 e320 wagon misfires
09-09-2014, 10:26 PM
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99 E320 4Matic Wagon
99 e320 wagon misfires
First the Problem--While driving home two days ago my 99 wagon started to misfire and lose power. It finally started to die, I coasted down a hill and into a parking lot. Turned key off then back on. Started up ran ok enough to go final two miles home but not any real power in it. Checked the codes got
P 300, 303,306,302.
Let the car sit for a while started it up still running rough, check codes
P 300,303,306,302.
Did this several more times same results. Came to forum, did a search for codes, seems to indicate 1. Bad cats, 2. MAF sensor, 3. Bad plugs, 4. Bad Wires, 5. Coil packs.
Now some history-- Owned wagon about a year and a half 90k when purchased, currently at 120k. At around 100K had plugs and wires replaced. Last December had cat failure and had all cats opened up cleaned out and welded shut(long story). Car has run great since that day.
Yesterday I picked up MAF cleaner, and cleaned the MAF twice. Reinstalled , no change P 300,303,306,302. Ordered new MAF. on the outside chance that some residual cat material may have been left in exhaust system I disconnected the rear cat / front muffler connection. Now running straight out of rear cats. Installed new MAF sensor, fired up the beast, still misfiring, but able to at least get the rpm's up. Check codes.
P 300,304,305,306. Ran this procedure several times same codes. Checked all plug wires seem good. Any help greatly appreciated. Thanks in advance.
P 300, 303,306,302.
Let the car sit for a while started it up still running rough, check codes
P 300,303,306,302.
Did this several more times same results. Came to forum, did a search for codes, seems to indicate 1. Bad cats, 2. MAF sensor, 3. Bad plugs, 4. Bad Wires, 5. Coil packs.
Now some history-- Owned wagon about a year and a half 90k when purchased, currently at 120k. At around 100K had plugs and wires replaced. Last December had cat failure and had all cats opened up cleaned out and welded shut(long story). Car has run great since that day.
Yesterday I picked up MAF cleaner, and cleaned the MAF twice. Reinstalled , no change P 300,303,306,302. Ordered new MAF. on the outside chance that some residual cat material may have been left in exhaust system I disconnected the rear cat / front muffler connection. Now running straight out of rear cats. Installed new MAF sensor, fired up the beast, still misfiring, but able to at least get the rpm's up. Check codes.
P 300,304,305,306. Ran this procedure several times same codes. Checked all plug wires seem good. Any help greatly appreciated. Thanks in advance.
