All Things Mk5 > How to Guides / Troubleshooting
Weird issue with RPMs - Help Needed!
Danthefourwheeler:
So I've got a 2006 MK5 GTI manual 112k on the clock. Started having a weird issue where the revs would start rising randomly when in neutral or at a stop. Took it to VW to get full diagnostics done and they said the MAF (Mass Air Flow Sensor) was faulty. I took the car back, replaced the sensor and put a new PCV in for good measure. The issue stopped and the car seemed to run fine until...
Now that issue has gone, I've noticed something else instead. It's hard to explain but it only starts after about 20-30 mins of driving. What happens is, after accelerating and then releasing the throttle, the car seems to sort of carry on itself for a while, and I see the revs hover for a second or two, then all of a sudden it jerks into engine breaking and it starts to decelerate. Happens in all gears, at any speed, always the same effect. Accelerating like normal, come off the throttle, it continues to accelerate/maintain revs for a bit, then jerks and starts slowing down with engine breaking.
I've been reading around and heard it could be a boost leak or something similar, I've just ordered some new breather pipes that connect to PCV just in case once of them is torn or something.
Is there anything else I should be looking at?
Any suggestions are much appreciated
Dan
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mjmallia:
Sounds like a vacuum leak.....boost leaks would take power away
Danthefourwheeler:
--- Quote from: mjmallia on October 28, 2020, 10:19:00 am ---Sounds like a vacuum leak.....boost leaks would take power away
--- End quote ---
What's the fix?
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GVK:
Check for leaks on the servo pipes and the inlet, was your pcv aftermarket or genuine? As the non-gen ones can give as many problems as a knackered one!
Danthefourwheeler:
--- Quote from: GVK on October 28, 2020, 10:30:28 am ---Check for leaks on the servo pipes and the inlet, was your pcv aftermarket or genuine? As the non-gen ones can give as many problems as a knackered one!
--- End quote ---
It was genuine PCV, I'll check those other pipes, some people are mentioning the vaccum pump itself, or gasket?
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