5000 RPM problem.

[Flavor-DSM]

Ok fellas.. here's the deal. My car is fine up until 5000 then it just kind of shuts off.. I got a datalogger thinking it would help me figure out the problem. I have been running on 93 octane gas for about 3 tanks now and I read 0 knock. So excessive knock isn't the problem. another thing I found out is I can rev it past 5grand in neutral. Also i can "ease" it past 5grand RPM, but if I'm WOT and fully boosting it will fall on its face. Is it a possibility that if the timing is off this could be a problem. I have seen that my timing is reading in the double digit degrees at idle.. What is the degrees supposed to be, does anyone know? Now that I have this datalogger I can supply you with any other information you need to help me with this problem. Just ask and I will try to figure it out. Thank you all very much. I truly appreciate your help!

 

[strunk]

what do you mean it "shuts off"? What are your fuel modifications? and what turbo are you running with? I dont mean to answer your post with questions, but that could be a couple of different things more information is needed to properly diagnose.

 

[Flavor-DSM]

I don't have any fuel modifications. It's the stock 14b turbo. The car is completely stock. Sorry about not posting that before. I was hyped up on trying to explain my problem and forgot to say what the car was! .. Its a 1991 Eagle Talon TSI.. and its stock. the only thing I have done to it is put a drop in K&N a boost controller and Boost Gauge.. Haven't began modding it yet because I want to make sure I have it running to peak performance before I start making it fast . I turned the boost down to 8 psi for daily driving and such.. (was that a bad idea)? .. Anyways.. by shutting off I mean it feels like I hit my rev limiter or something.. The RPM just stop climbing..If I keep WOT while it happens it will shut off and when the RPMs fall a little bit it will pick back up and then shut off again once it hits 5k RPM.. let me know if you need anymore information on the car! thanks for your help mate!

 

[Sotarts]

I got a datalogger thinking it would help me figure out the problem. I have been running on 93 octane gas for about 3 tanks now and I read 0 knock. :

Datalogger might help, if you look at the logs.

What kind of gas were you using before those three tanks???

 

[Flavor-DSM]

Datalogger might help, if you look at the logs.

What kind of gas were you using before those three tanks???

I haven't had the car for very long.. Just a few weeks.. I put like $10 of 87 in it to get it home from where it was because I didn't have much. I don't know what was ran in it from the previous owner. But directly after I put the crap gas in I started with 93 octane.

 

[RedRain]

Possible boost leak?

 

[Flavor-DSM]

It also might be helpful to let you know that I had to replace 16 valves and the water pump and also the head gasget. Just to let you know.

 

[Flavor-DSM]

Possible boost leak?

You think that might be it? I haven't done a boost leak test on it yet. I know from reading on this webpage that it's always good to do a boost leak test so I've been wanting to but just haven't got around to it. I might have to do that and let you guys know on how it goes. Thanks for your help I appreciate it!

 

[RedRain]

It wouldnt hurt to try it. No problem, thats why we DSMers are here for. To teach each other and learn from each other. Good Luck!

 

[Defiant]

New (gapped) plugs and wires.

 

[Flavor-DSM]

New (gapped) plugs and wires.

I have brand new (less than 250 miles) plugs and wires. Also a new fuel filter.. Sorry I didnt specify that before as well

 

[illuminatus]

Sound like a boot leak problem.

 

[Flavor-DSM]

Sound like a boot leak problem.

Are all of these symptoms of a boost leak? This next question will be hardcore newbified so I apologize in advance.. What all can leak with a boost leak? Like all of my vacuume lines or just intercooler piping? Thanks mate.

 

[Defiant]

I have brand new (less than 250 miles) plugs

NGK BPR6ES at .028"?

 

[ddavisaf]

You can't just use spark plugs. They have to be NGK BGRP6ES's...
If you run platinum plugs then we just figured out your problem.

Fuel cut is usually a boost leak. Check it out.
http://www.vfaq.com/mods/ICtester.html

Do a boost leak test then post back. And let us know what kind of plugs.

 

[Flavor-DSM]

Thank you all very much who have helped me out. I will make a boost leak tester thingy within the next few days and do a boost leak test. My Spark plugs are not NGK BPR6ES's.. so I will be replacing those also within the next few days as well .. I'll let you know what happens in the next few days. Thanks again friends.
-----------------------------------

Quick update for you guys: I'll be getting paid this friday so I will be able to pick up some new spark plugs and I'm going out to make boost leak tester. Right now I'm hardcore broke because I had to pay for college books .. Anyways I just want to thank all of you for the help. I really appreciate it. I'll let you know how my boost leak test goes. Later.

 

[Flavor-DSM]

Definatly check for boost leaks, and tell us your 3 fuel trims, low med and high.

It says:

FTRL - 85.9%
FTRM - 100%
FTRH - 100%

Not too sure what that means I'm still new to tuning and all of this

I've noticed from my datalogger my o2 will have some really weird readings.. Like it will always be Under ~.30Volts or either Above ~3.2Volts.. I'm reading the volts from my datalogger.. wondering if it is my o2 sensor going bad? I got my boost leak tester and now I just need to find time in between being a full time student and full time work to test it. It will be sometime very soon though.. I'll keep you guys posted.

Thanks again, I really appreciate all of your help.

Richard

 

[Sotarts]

It says:

FTRL - 85.9%
FTRM - 100%
FTRH - 100%

Not too sure what that means I'm still new to tuning and all of this

I've noticed from my datalogger my o2 will have some really weird readings.. Like it will always be Under ~.30Volts or either Above ~3.2Volts.. I'm reading the volts from my datalogger.. wondering if it is my o2 sensor going bad? I got my boost leak tester and now I just need to find time in between being a full time student and full time work to test it. It will be sometime very soon though.. I'll keep you guys posted.

Thanks again, I really appreciate all of your help.

Richard

FTRL, FTRM and FTRH are fuel trims, Low, Medium and High, respectively. Low fuel trim should be closer to 100%. You want all trims around 100%. If the O2 values seem to be sluggish in changing or doing weird stuff, O2 sensor is going bad or is already bad (happened to me and my buddy, so I'm speaking from experience); make sure the O2 sensor doesn't have a loose or unplugged wire too (it happens).

Definitely try new plugs (PROPERLY GAPPED!!!) and wires, like Defiant suggested. That could be your single problem source. Car shouldn't run retarded with just a bad O2 sensor.

Boost/vaccum leak is another possibility. Check all hoses going from turbo compressor's output to intercooler, from intercooler to BOV, from BOV to intake manifold and sometimes people have leaks between intake manifold and head. Keep the car runing and spray some WD40 onto all the connecting places--the car should die or change RPM's at least.

 

[Flavor-DSM]

How do I change my low fuel trim so it is closer to 100%? Is there anything I can do?

Also - When I was putting the head gasget on I ran over my O2 sensor with a car jack and the wires got ripped out .. I shoved them back in though.. I figure this is why its all weird-like, eh?

Thanks again, friends.

Richard

 

[Flavor-DSM]

I put a new 02 sensor in and its working great. That problem fixed. .. Got my new NGK spark plugs gapped at .028". That problem fixed. Everything is starting to look up. Adjusted the timing and my Base Idle.. Idles good. I'm getting ready to head over to a friends house cause he has a air bleeder tank and going to try and do this Boost leak test. This is my first time doing it.. So I just hook the tester up to the intake of the turbo and pump it up and listen for leaks right? I dont have to block anything off or clamp anything or nothing right? ..

Problems still to fix:

5000 RPM cut problem

(NEW) hole in radiator.

BTW I'm ordering me one of those shiny Koyo Aluminum Radiators and so that should fix my radiator problem.

Just curious though.. If I have no boost leaks (highly unlikely, I know).. What else would cause the cut out problem if I'm WOT as soon as I hit 5000 RPM?

Thank you all VERY VERY VERY VERY VERY much for all your help with my car. I really appreciate it!

Richard

 

[Flavor-DSM]

Ok so I tried to do this boost leak test. I took off my MAF and intake pipe and hooked the boost leak test up to where the intake use to hook up to on the turbo. I tried to put air in it and I got nothing. I was using a hand pump to pump up bike tires but it still should of read some pressure. I could hear it all leaking out somewhere but I can't find where.. Is there anything else I need to do to complete this test other than hook the Boost leak tester on the intake of the turbo? I read how to do a boost leak test with the boostpro.net tester from this website. Is my leak just so terrible that I cant hold any pressure in my system whatsoever or did I actually do something wrong? I know the tester worked because I put a spray paint can on the other side of the reducer and it held pressure.. I would hate to think my system can not hold 1 psi of air..

 

[ddavisaf]

Spray soapy water and look for bubbles.