Something weird at 3500-4000 rpm
 

Ok so here it is, when i start to floor the pedal (happens on every gear) and the rpm goes up, the boost kicks in, and right when it hits 3500-4000 rpm the car all of a sudden bogs, chokes, lags, or almost dies (the feeling is like when it's your first time driving and you really haven't learned how to balance the first gear yet, so it chokes and nearly dies), so then i just shift to the next gear and it then it seems fine again. It's like the car can't go past 3500-4000 rpm.

It's weird, to me but hopefully not to you guys.

The car does have a pretty big leak coming from the turbo manifold gasket.

Re: Something weird at 3500-4000 rpm
 

Chu, it's a boost leak Paul probably never fixed. ;)

Re: Something weird at 3500-4000 rpm
 

Plugs, wires, boost leak check.

Re: Something weird at 3500-4000 rpm
 

Well from what Paul was telling me it was the bad Throttle body or throttle cable (paul said you said Anthony had the same problem so he swtiched the throttle body and then it all seemed fine) which im not sure he's correct on, so right now i was wondering if i should go to my workplace and get the intake manifold/throttlebody cleaner and spray it down.

Im kinda thinking this "leak" is that HUGE leak from the turbo manifold.

oh yeah does anyone have the unlimited carfax history deal, i really don't want to pay $30 for one car.

vin# 4E3CT64U0ME074105 (not sure if the "0" are zeros or "o")

Re: Something weird at 3500-4000 rpm
 

Ok I am just going to add on to this forum also because I am having the same problem however I have been told that it could be the fuel pump that is given me problems. I hope Bunta won't mind

Symptoms are when I start to rev up to 4000 rpm the car starts to bog down and hesitate. The boost guage (which is the stock one and I should get an aftermarket one) says that it is getting like 13psi of boost.

Would the fuel pump have the same symptoms as a boost leak or is this for sure a boost leak problem?

I do have a 90 car with origional ECU and heard that those start to break down after a while and the first thing it seem like is going to go is the fuel pump but it is really the ECU. Am I getting this right or did I hear a bad rumor?

The funny thing is that before I bought the car the person said they did a leak down test on the turbo system and couldn't find any leaks so they suspected a bad fuel pump.

Thanks for your help

Re: Something weird at 3500-4000 rpm
 

never mind! i fix the problem
yay for me

Re: Something weird at 3500-4000 rpm
 

What fixed the problem?

Re: Something weird at 3500-4000 rpm
 

Well remember I just got this car a week ago and I am kind of working out all the bugs yet. The problem kind of, sometime, but not all of the time, went away now. I replaced the fuel filter and I think that fixed it, or it did something.
However I just ran into another problem where my car is sucking gas now. One problem goes to another i guess. At first I thought I have a leak where the fuel filter is but that doesn't seem to be the problem. I would really like a data logger to see what the heck is going on. :confused: I need help:(

Re: Something weird at 3500-4000 rpm
 

Ok I just got done changing fluids and checking everything on the car.

I found out (well I got help from someone else down the steet) that the problems are my spark plugs. Now don't bash on me too much because I am new to the Turbo DSM world and NOW understand the importance of spark plugs and brands. I now know NGK spark plugs are junk. They were new when the previous owner bought them and they fouled up. They would hesitate at the upper rpms and sucking fuel at the lower rpms. So I put some Sea Foam in the tank to clean everything out and it is running much better. I chose the copper autolite spark plugs. Cheap and they are working quite well so far as I can tell!!

Now my car is running like it should!!!!:D

Re: Something weird at 3500-4000 rpm
 

Actually NGK's are the plug of choice! The problem is that they probably were not gapped right or they just needed to be changed. You should be gapping at .026 - .028", depending on boost.

Re: Something weird at 3500-4000 rpm
 

Really?!! :confused:
I will recheck them because I still have them in the box. But I am running stock boost so what would the correct gap be?

Re: Something weird at 3500-4000 rpm
 

Rechecked them
The book says that the turbos should be gapped at .032 I checked every one and thats what they are gapped at. Should they be gapped at something else?

Re: Something weird at 3500-4000 rpm
 

NGK BPRES6 or whatever are the plugs you should be using. Gap them correctly as jet said because you can get spark blow out. Don't get any Vpower plugs either. Make sure there is no number like *-11* after the main code. Also, make sure the number in the Part number is SIX, not Seven. You don't need that change.

Re: Something weird at 3500-4000 rpm
 

How dare you write a different topic on this thread, HOW DARE YOU!!!:mad: ...J/P:D , I DON'T CARE...cause i just bought myself a 90 white TSi..hahaah..yess!!...and it only had 110,000 miles!!!...whoa!!!:eek:

Re: Something weird at 3500-4000 rpm
 

Ok I am sorry If I had offended anyone with my NGK bashing. I should have done a brand check here before I posted anything. However I the three people that were helping me were giving me greef about having them in there. They fouled, they said that they don't work because they foul so I believed them.
However if you say that they should work I am willing to try to make them work because the person who bought the car before me replaced them not that long ago, however looking at the plugs I wonder how long ago that was. So maybe they just needed to be changed...??:confused:

Looking at the plug the they are the NGK R BPR6ES and they are gapped at .032 which thats what they should be at right?

Again sorry about the NGK bashing:( don't want to make enemys just yet:D

Re: Something weird at 3500-4000 rpm
 

Yes, that's the right plug and gap that you want. Perhaps they fouled out due to other reasons, which made them run bad. I'd advise to go get some new ones in this case, they're cheap enough to where you can replace them whenever you want, right ;)