Svenska Posted September 24, 2013 Report Share Posted September 24, 2013 I'm hoping someone can point me in the right direction on this one. I just replaced the clutch on my 850. Everything is great except every time I slow down with the clutch depressed or not (from 40 mph to zero), the engine stalls out. While accelerating it is flawless, no skipping, nothing, only when I come up to a stop sign or red light and am slowing down while braking or not, it stalls. I'm almost sure it's a vacuum leak. Before I spend days tracing this, can someone point me in the direction of which connection it may be? Thanks. Link to comment Share on other sites More sharing options...
p4eAaLcLe Posted September 24, 2013 Report Share Posted September 24, 2013 Does it idle? Mine was the MAF when I had this issue along with an idle issue. Unplug the MAF and if it idles better, then that's your problem. Link to comment Share on other sites More sharing options...
rmorse Posted September 24, 2013 Report Share Posted September 24, 2013 If it didn't do it before the clutch job, I'm assuming the clutch isn't engaging all the way when you're slowing down and that's why the motor's stalling. Link to comment Share on other sites More sharing options...
Svenska Posted September 24, 2013 Author Report Share Posted September 24, 2013 It doesn't happen at idle at all, although I swear I hear a hiss from the front of the engine which would be a vacuum leak. It does happen in neutral too, independent of where the clutch is (obviously not engaged). If it were a clutch issue, would the slave cylinder not be pushed in enough? Is that what you mean? Link to comment Share on other sites More sharing options...
D s50r Posted September 24, 2013 Report Share Posted September 24, 2013 check engine light on? any codes? very possibly a large vac. leak or bad maf, unplug it like previously stated Link to comment Share on other sites More sharing options...
Piston Slapper Posted September 24, 2013 Report Share Posted September 24, 2013 If it didn't do it before the clutch job, I'm assuming the clutch isn't DISengaging all the way when you're slowing down and that's why the motor's stalling. FTFY Also, if it doesn't do it at idle with the pedal in, it shouldn't do it while it's rolling with the pedal in. Or when it's in neutral. Link to comment Share on other sites More sharing options...
rmorse Posted September 24, 2013 Report Share Posted September 24, 2013 FTFY Also, if it doesn't do it at idle with the pedal in, it shouldn't do it while it's rolling with the pedal in. Or when it's in neutral. I've had bikes do that though, that's I said it. I don't know much about manual cars, but I've had bikes that had a stretched clutch cable, where it was sometimes engaging and sometimes not engaging. Would stall if I pulled the clutch in and tap the rear brake while I'm in the air, to bring the rear of the bike down. Link to comment Share on other sites More sharing options...
D s50r Posted September 24, 2013 Report Share Posted September 24, 2013 hmmm now that u say that, ive had the same issue with my 636... hmmm but i just dont see it with a hydraulic clutch tho... Link to comment Share on other sites More sharing options...
rmorse Posted September 24, 2013 Report Share Posted September 24, 2013 hmmm now that u say that, ive had the same issue with my 636... hmmm but i just dont see it with a hydraulic clutch tho... You're getting air on your 636? I had that happen with my self-adjusting Magura hydraulic clutch that I put on one of my motocross bikes, but the problem ended up being with the lever itself. Link to comment Share on other sites More sharing options...
Svenska Posted September 24, 2013 Author Report Share Posted September 24, 2013 I just drove it again around the block. It will stall only when coming to a stop, regardless if I'm in gear or in neutral which tells me it doesn't have anything to do with the clutch. The common factor here is that I'm applying the brakes which is taking vacuum from the engine to activate the brake booster. I'm robbing needed vacuum from the engine for the brakes, therefore it stalls when I approach a stop sign or red light. No CELs and no codes stored. With engine at idle, when the MAF is unplugged, it stalls immediately. Link to comment Share on other sites More sharing options...
Fudge_Brownie Posted September 24, 2013 Report Share Posted September 24, 2013 Check the intake manifold nipple on the passenger side, behind the PS pump / alternator. It's got an elbow attached to it, which then feeds in to a hard plastic line. Sometimes the hard plastic line pops out the back, which is hard to see. On a quick inspection, the elbow is still connected to the manifold so it all looks good at first.Otherwise, check the lines running to and from the BCS, the two nipples on the intake manifold just under the vacuum tree, and the tree itself for cracks and missing covers. Link to comment Share on other sites More sharing options...
Svenska Posted September 24, 2013 Author Report Share Posted September 24, 2013 I don't have a turbo model. I'm pretty sure the turbos have that elbow that is hell to get on and off with needle nose pliers. I know which one you mean. I have nothing in that area though. I will look at the tree more closely though. It seems to stall more when it's in gear which makes me think maybe it is the clutch, but it also occasionally stalls in neutral when I'm coasting up to a red light. Weird. If it happens in neutral then it can't be the clutch. It idles beautifully in neutral, no surging or grabbing like it is almost in gear (if it were the clutch). Link to comment Share on other sites More sharing options...
rmorse Posted September 24, 2013 Report Share Posted September 24, 2013 And it wasn't happening before you did the clutch? Link to comment Share on other sites More sharing options...
Kevin. Posted September 24, 2013 Report Share Posted September 24, 2013 Idle air control? Link to comment Share on other sites More sharing options...
Tightmopedman9 Posted September 24, 2013 Report Share Posted September 24, 2013 Is it only happening when the brakes are applied? It could be a problem with your brake booster... Link to comment Share on other sites More sharing options...
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