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  #1  
Old 10-11-2009, 07:19 PM
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Location: Seattle
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1998 C230, can a coil be going bad without throwing a code?

When I had a coil go bad it failed completely (on one side) and I got a code. Now I have "sometimes" a slight hesitation on acceleration. Trying to come up with some theory to explain it.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #2  
Old 10-12-2009, 08:10 AM
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I doubt it. Any misfire caused by combustion misfire are stored by ECU.

Have you cleaned (special solvent) OR replaced mass air flow sensor?
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  #3  
Old 10-12-2009, 02:47 PM
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Yes. I replaced it about 6 months ago with the correct Bosch PN. It worked fine after that, until recently. It seems to only do it after it warms up but I can't say that for sure. It doesn't do it consistently, but when it does, it is very noticeable, and very bad when the AC is on.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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