C230 intermittent misfire; fine on restart...
#1
C230 intermittent misfire; fine on restart...
Sorry if this may have been previously or indirectly addressed...
1997 C230 (145K) intermittently begins to chug/misfire, etc. while driving. If engine is turned off and immediately restarted, vehicle runs fine again. It's been doing this (intermittently) for months. NO check engine light, however OBDII has indicated cyl. 2 misfire in the past (possibly tripped as a by-product?). I've heard of various probable causes, most recently the crank sensor. Surely disappearance of the problem upon (immediate) restart helps to fine-tune a diagnosis? Any thoughts? Thanks much!
1997 C230 (145K) intermittently begins to chug/misfire, etc. while driving. If engine is turned off and immediately restarted, vehicle runs fine again. It's been doing this (intermittently) for months. NO check engine light, however OBDII has indicated cyl. 2 misfire in the past (possibly tripped as a by-product?). I've heard of various probable causes, most recently the crank sensor. Surely disappearance of the problem upon (immediate) restart helps to fine-tune a diagnosis? Any thoughts? Thanks much!
#2
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205, 211 V8 4M, B7 /RS4, e30 ///M3
check the spark plugs and the fuel injector on Cyl 2. if there fine, then tis the coil pack. bout $100 or so
usually happened to me when i would come offthe highway, i guess from pushing her a litttle harder then normal.
usually happened to me when i would come offthe highway, i guess from pushing her a litttle harder then normal.
#3
Thanks for the replies -- previous one suggested possibility of oil from camshaft sensor area leaking on/into the wiring harness, but there's no oil leaking from/around the sensor. The 'already tried' info includes mention that when the problem first surfaced plugs & wires were changed, injectors were checked, fuel filter replaced, and coils were swapped (...but OBDII still pegged cyl. 2 as the error, which I think may just be a 'by-product' of the real issue.
Still wondering whether the crank sensor is a possibility. What possible problem(s) would (immediately) 'reset' with the restart??
Still wondering whether the crank sensor is a possibility. What possible problem(s) would (immediately) 'reset' with the restart??
#5
Thanks for the response... I won't likely be able to address anything for a little while (...work & commute way too many hours -- it's also tough to reply here in a timely fashion!). I'm going to order some parts, including a knock sensor, and when I get the chance to install I'll swap two injectors as well (didn't do that before, just the coils), since the only OBDII code I continue to get indicates cyl. 2. Will this thread stay open in the meantime?
#7
Has anyone experienced the problem described above-and found the solution? I'm going to install a set of new coils, leads, and plugs tomorrow, but really, it's just a shot in the dark. It bothers me that it's intermittent. Why would it do that??? If it does work, I WILL post back. It's aggrivating when peopke don't do that!
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#8
In my case, it was NOT anything in the ignition system. New plugs, wires, and coils did nothing to effect it. It turned out to be a blown head gasket. I only clued in to this after observing what I thought was more than average water vapor coming out of the tailpipe on startup. I got this stuff called 'K-Seal' from the local auto parts store and you know what? It worked! The misfire went away, as did the water vapor out the tailpipe on cold starts. I just hope it holds long enough for me to gather all the stuff to have the head rebuilt+gaskets.
#9
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205, 211 V8 4M, B7 /RS4, e30 ///M3
Has anyone experienced the problem described above-and found the solution? I'm going to install a set of new coils, leads, and plugs tomorrow, but really, it's just a shot in the dark. It bothers me that it's intermittent. Why would it do that??? If it does work, I WILL post back. It's aggrivating when peopke don't do that!
#10