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Old February 17th, 2018, 09:47   #1
Nugget3816
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Default Overboosting problems

I've got a 2002 VW beetle with a 1.9, I'm having issues diagnosing a problem. I've changed MAF sensor and VNT actuator, but it still doesn't go passed 4000 RPM. If I disconnect the vacuum to the actuator it'll rev up to over 5000 RPM, it runs fine up until it hits third gear and then it just has no giddy up and go. It takes about 3/4 of a mile to hit 60 mph. I'm pretty much baffled at this point. Any suggestions would be appreciated.
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Old February 17th, 2018, 11:09   #2
PB_NB
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Hi Nugget, you should really scan the car with VCDS if you have one. Throwing parts at the problem just empties your wallet! If it is overboosting, you will be able to log that and work towards correcting it.

Your other/previous posting on this same topic should be linked to this so you can benefit from the knowledge from the experts on this forum.
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Old February 17th, 2018, 11:13   #3
Vince Waldon
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Perhaps track down Canadian Grizzlie's "diagnosing limp mode" HOW-TO that's listed in his signature... a clear methodical scientific way to track down causes of over/underboosting.
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Old February 19th, 2018, 10:47   #4
Nugget3816
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Ok, so turbo has been cleaned. Took it out for a test drive, engine light came on after about 2 miles. Put it on the scanner and still having an overboosting problem.
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Old February 19th, 2018, 11:18   #5
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Ok, so now I have no engine light coming on. But I did find out my N75 is junk, I was pulling it up on to car ramps and it wouldn't do it. Just alot of black smoke, switched it with the egr solenoid and it climbed right up. Still seems a little sluggish though.
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Old February 19th, 2018, 11:24   #6
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what is the code?
bad n75 vlave and bad vacuum lines or a bad actuator, this is the only few things that really can cause this issue save for some rarer things but we will cross that bridge when we get to it.
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Old February 19th, 2018, 12:10   #7
Nugget3816
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It's definitely a bad N75. Now I'm just trying to fine tune the actuator, I can't get it to "open" all the way. It won't quite touch the stop set screw. If it does then it'll only move maybe an 1/8 of an inch.
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Old February 19th, 2018, 12:11   #8
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The code was 0234
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Old February 19th, 2018, 16:09   #9
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replace actuator, and all your lines, then the n75 last as its the most $$$
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Old February 19th, 2018, 16:22   #10
Nugget3816
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Already replaced actuator, MAF sensor, cleaned turbo and now I just need to replace N75 and hoses
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Old February 19th, 2018, 17:03   #11
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then it just needs adjusting
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Old February 24th, 2018, 14:15   #12
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Ok new problem, the car won't start unless I unplug the EGR valve from the vacuum
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Old February 24th, 2018, 17:29   #13
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Quote:
Originally Posted by Nugget3816 View Post
Ok new problem, the car won't start unless I unplug the EGR valve from the vacuum
That means you have VAC lines criss crossed somewhere
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Old February 24th, 2018, 20:03   #14
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Quote:
Originally Posted by JDSwan87 View Post
That means you have VAC lines criss crossed somewhere
Yup!
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Old February 27th, 2018, 18:43   #15
Nugget3816
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Took the beetle to a shop, they ran diagnostic on and come to find out the intake is almost completely sooted up and plugged.
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