I don't even know where to begin at this point. never has this swap ran properly since day 1. I'm really sad and pissed off that I'm beginning to regret doing it at all. /vent
I have an S50/ZF, both engine & trans are fully rebuilt, clutch is feramic south bend with low miles. should have done more while the motor was out, but I couldn't.
idle has been rough, I had to increase it to about 8-900rpm for any hope of smoothness. idle also increased after warmup. I've always suspected vac leaks but have been putting off a shop visit until my major issues are dealt with - terrible lifter tick that I suspect stems from internal pressure loss, hopefully a new secondary chain tensioner helps but I may need new lifters which is another very expensive proposition.
anyways, today I changed out the throttle body because my original was junky, didn't return to the stop reliably, and I wanted to freshen it up and put in a new gasket. I also changed the CCV, because I noticed oil buildup and of course I found a little pool of oil inside the intake. Really though, I'm not sure I can fault the CCV for anything but a weak seal... I don't see how that OBD1 design can possibly ensure that oil doesn't enter the intake. I also changed the coolant temp sensor, likely responsible for the odd warmup idle change. I already have a new ICV and all new rubber.
first impression - relief. idle behavior seems normal and smoother. but that feeling didn't last long....
as soon as I tried for a bit of thrust, I got this strange vibration/hesitation/misfire/breakup that I've been feeling increasingly since the swap. happened once in the first 4 months, twice in the latter 2 months, and then has been occurring off-and-on in the past week. as I go beyond maybe 20% throttle, the engine chokes, stutters, and gutlessly hesitates in a constant sort of way. see video:
you can hear it but the feeling is dramatic.
first time this happened was in first gear taking off. I let off the throttle, re-selected the gear and it was fine for a long time. later, it would be up to 3rd gear in higher-load situations (see video), and now if it happens it even seems noticable revving in neutral. fuel delivery? I was thinking fuel pump, but then just now I got an audible knocking from the area of the transmission as it stuttered in first gear, perhaps driveshaft vibration or something like that? guibo and CSB are new.
I'm at a loss, in more ways than one. dealing with the ever-nearing doom of a qty 24 lifter purchase on top of either DIY'ing it (never done cams before) or paying for the labor has been rough enough.... now I have new problems with no idea what the cause could be. I spend way too much time researching problems on r3v and bimmerforums. does anyone want to buy a very clean alpine S50-swapped 4-door? it's like I'm being teased with how nearly the car is to being great, and I don't have the time to put in to get it there. at this point I definitely could have bought a 100k mile E46 M3 and simply maintained that. facepalm doesn't begin to describe...
I have an S50/ZF, both engine & trans are fully rebuilt, clutch is feramic south bend with low miles. should have done more while the motor was out, but I couldn't.
idle has been rough, I had to increase it to about 8-900rpm for any hope of smoothness. idle also increased after warmup. I've always suspected vac leaks but have been putting off a shop visit until my major issues are dealt with - terrible lifter tick that I suspect stems from internal pressure loss, hopefully a new secondary chain tensioner helps but I may need new lifters which is another very expensive proposition.
anyways, today I changed out the throttle body because my original was junky, didn't return to the stop reliably, and I wanted to freshen it up and put in a new gasket. I also changed the CCV, because I noticed oil buildup and of course I found a little pool of oil inside the intake. Really though, I'm not sure I can fault the CCV for anything but a weak seal... I don't see how that OBD1 design can possibly ensure that oil doesn't enter the intake. I also changed the coolant temp sensor, likely responsible for the odd warmup idle change. I already have a new ICV and all new rubber.
first impression - relief. idle behavior seems normal and smoother. but that feeling didn't last long....
as soon as I tried for a bit of thrust, I got this strange vibration/hesitation/misfire/breakup that I've been feeling increasingly since the swap. happened once in the first 4 months, twice in the latter 2 months, and then has been occurring off-and-on in the past week. as I go beyond maybe 20% throttle, the engine chokes, stutters, and gutlessly hesitates in a constant sort of way. see video:
you can hear it but the feeling is dramatic.
first time this happened was in first gear taking off. I let off the throttle, re-selected the gear and it was fine for a long time. later, it would be up to 3rd gear in higher-load situations (see video), and now if it happens it even seems noticable revving in neutral. fuel delivery? I was thinking fuel pump, but then just now I got an audible knocking from the area of the transmission as it stuttered in first gear, perhaps driveshaft vibration or something like that? guibo and CSB are new.
I'm at a loss, in more ways than one. dealing with the ever-nearing doom of a qty 24 lifter purchase on top of either DIY'ing it (never done cams before) or paying for the labor has been rough enough.... now I have new problems with no idea what the cause could be. I spend way too much time researching problems on r3v and bimmerforums. does anyone want to buy a very clean alpine S50-swapped 4-door? it's like I'm being teased with how nearly the car is to being great, and I don't have the time to put in to get it there. at this point I definitely could have bought a 100k mile E46 M3 and simply maintained that. facepalm doesn't begin to describe...
...
Comment