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Old 07-26-2002, 03:10 AM
Posts: n/a
Need help... e430 with bad miss at idle

i have a 98 e 430 that has a very ruff idle.. i have changed the plugs (reinstalled new bosch platinums) had the following parts available for test and i tried them all to no avial.
air flow meter, plug wires, all 8 coil packs, crank sensor
i changed them out and it still does the exact same thing.
it seems to run fine while accelerating but at idle whether in park or in drive it runs like poop. i have unplugged each coil pack while running and they all made a difference. the old spark plugs that i took out all had the same consistancy(milky white in color) maybe a little too lean ? i have had it at a MBZ dealer and they could feel the miss but could find nothing (no bad codes were stored). i have searched for vacuum leaks and have found nothing. i am stumped on this one. PLEASE HELP.
when in gear and parking brake on it feels like it pulses real bad.
i have noticed that when the a/c is on it is not as severe.
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Old 07-26-2002, 08:08 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Are you sure that it is a misfire? Many times the front vibration damper will COME apart on these engines & cause a "funny" vibration at idle OR just off idle. Have replaced hundreds of these on this engine & the M112 V-6 as well.
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Old 07-26-2002, 08:15 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
Sounds like a stuck/dirty EGR valve..
Any codes?
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Old 07-26-2002, 11:13 AM
Posts: n/a
e 430 with miss

the car showed no codes and the check engine light has not come on. it acts likes it is idlig to low and feels like it has a monstrous cam in it. deffenently not smooth as it was before.
and it does this throughout the heat range,makes no difference if it is cold or hot. do these cars have a idle stabilizer valve...
and where is the peep hole/ access plate to see in the fuel tank.
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Old 07-26-2002, 11:17 AM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
You may also want to try Bosch Super copper plugs over the plats...
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Old 07-26-2002, 12:23 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Did you use Bosch F8DPER plugs. These are not the normal Bosch Platinum Plugs. You will find out when you pay for them. This is the plug that MB recommends.

MB specifically recommends against the use of the Aftermarket Bosch Platinum plugs.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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