Crazy engine break?!
#13
So next time it happens, try to put the clutch in. Check the brakes sometime too just to see if they wiggle much. That might point you in the right direction. I'd be hesitant to think fuel and spark could cause resistance in the engine. Sure they might cause no forward push, but he's experiencing resistance.
#15
Brakes are free and Jemery I have no ebrake! I ran camera the whole way home from work and couldn't get it to happen, but none the less I have a "normal engine brake" on there and then can show the difference. Could a vacuum issue cause this? (no boost gauge) And I can't really just push in the clutch like asked I mean I'm in high speed traffic and when it happens I bounce from 70+ down to 55 I'm risking getting *** ended as is! I've never had it happen other than highway... It's super annoying that I don't know whats causing it!!! I'm going to try and run vag this week and hopefully pull an invisible code which would help!!!
#17
Ya it's actually got nothing to do with the brake system. Unless you're abs module is acting up. But you would have a severe pull when this happened. I'm still suspecting a fuel/spark issue considering if one of these were to fail while driving in gear you would get the same situation. If you don't think what I'm saying try it at 20mph and you will experience similar results. Jm2c
#19
We're suggesting you try pushing in the clutch to see if you still "brake" as hard with the engine disengaged from the rest of the car. If it's your engine slowing you down, hitting the clutch will make it not slow you down as quickly.
I'm leaning towards a turbo problem. I can visualize it in my head, but I'm not sure if I can discribe it. If I remember correctly (bear with me, been a few months since I've driven my car) at 75MPH, you're at about 3,600 RPM, which means you're making some boost. If you let off the gas, then your boost decreases. Perhaps you're not reducing your boost enough, causing you to run lean, or even misfire, or maybe you're losing too much boost too quickly, causing you to run too rich and bogging down the engine. So, a shot in the dark tells me something may be wrong with your waste gate, or even your DV not releasing the pressure like it should causing your turbo to act silly?? Just a guess since we're all stumped here. Maybe someone can run with this idea and explain it better...
I'm leaning towards a turbo problem. I can visualize it in my head, but I'm not sure if I can discribe it. If I remember correctly (bear with me, been a few months since I've driven my car) at 75MPH, you're at about 3,600 RPM, which means you're making some boost. If you let off the gas, then your boost decreases. Perhaps you're not reducing your boost enough, causing you to run lean, or even misfire, or maybe you're losing too much boost too quickly, causing you to run too rich and bogging down the engine. So, a shot in the dark tells me something may be wrong with your waste gate, or even your DV not releasing the pressure like it should causing your turbo to act silly?? Just a guess since we're all stumped here. Maybe someone can run with this idea and explain it better...
#20
Ya it's actually got nothing to do with the brake system. Unless you're abs module is acting up. But you would have a severe pull when this happened. I'm still suspecting a fuel/spark issue considering if one of these were to fail while driving in gear you would get the same situation. If you don't think what I'm saying try it at 20mph and you will experience similar results. Jm2c
It did this before my seafoam and still now. New plugs.
We're suggesting you try pushing in the clutch to see if you still "brake" as hard with the engine disengaged from the rest of the car. If it's your engine slowing you down, hitting the clutch will make it not slow you down as quickly.
I'm leaning towards a turbo problem. I can visualize it in my head, but I'm not sure if I can discribe it. If I remember correctly (bear with me, been a few months since I've driven my car) at 75MPH, you're at about 3,600 RPM, which means you're making some boost. If you let off the gas, then your boost decreases. Perhaps you're not reducing your boost enough, causing you to run lean, or even misfire, or maybe you're losing too much boost too quickly, causing you to run too rich and bogging down the engine. So, a shot in the dark tells me something may be wrong with your waste gate, or even your DV not releasing the pressure like it should causing your turbo to act silly?? Just a guess since we're all stumped here. Maybe someone can run with this idea and explain it better...
I'm leaning towards a turbo problem. I can visualize it in my head, but I'm not sure if I can discribe it. If I remember correctly (bear with me, been a few months since I've driven my car) at 75MPH, you're at about 3,600 RPM, which means you're making some boost. If you let off the gas, then your boost decreases. Perhaps you're not reducing your boost enough, causing you to run lean, or even misfire, or maybe you're losing too much boost too quickly, causing you to run too rich and bogging down the engine. So, a shot in the dark tells me something may be wrong with your waste gate, or even your DV not releasing the pressure like it should causing your turbo to act silly?? Just a guess since we're all stumped here. Maybe someone can run with this idea and explain it better...
Last edited by chocalotstarfish; 05-23-2010 at 08:07 AM.