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I was getting a serious misfire after a hot restart. Car would run terribly, and then throw misfire codes on multiple cylinders on both banks. Shut off and restart would solve it, and no misfire at speed or WOT. Started to do it more often. Bought 2 coil packs wholesale from the dealer for around 1K each, plus the plugs and car is like new again.
Good color on plugs
New coil packs installed Drivers side was harder than passenger side
Last edited by Shiv Sikand; Feb 12, 2017 at 02:42 PM.
From what I've read, the ignition module failure causes a misfire on every cylinder in a bank. It also throws a specifc code. So at this time I'm not going to replace it unless I get additional misfire issues.
I had same issue, replaced coil packs and plugs. Still misfired on hot start, changed voltage converter everything has been perfect since. I'm looking at retrofitting heat sinks to voltage converter
I had same issue, replaced coil packs and plugs. Still misfired on hot start, changed voltage converter everything has been perfect since. I'm looking at retrofitting heat sinks to voltage converter
i continued down this rabbit hole. My hot start misfire would only happen on cylinder 1 and 7 sometimes 9 or 8. The voltage converter didn't solve it. It seems to be a vapor lock issue in the fuel rail. Some early bi-turbo cars have a 4 bar fuel pump control unit this isn't strong enough to fill the fuel rail up when then the ethanol has boiled off and vapor locking the fuel rail. I orderd the 5 bAr control unit and will be swapping on asap.
Tell me more about this "Some early bi-turbo cars have a 4 bar fuel pump control unit" I seem to get this random cylinder misfires; its happened twice. I shut off the car and clear the codes and I'm off again with no problem. It just happened twice so far. Do you have an item number or pic?
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
