Running Horrible

[iguanahotsauce]

So my talon is getting progressively worse. I think it might be because of the cold but I'm not sure. So as of now when you start it up it revs real low for a second and sounds like it's going to die then it revs up to around 2.5k and slowly drops to a steady 750rpm. Then When I first go to drive it as I step on the gas the car shakes bad and doesn't accelerate very much at all. Then after a while of doing this is starts to run normally but when I step on it to accelerate it's not a smooth acceleration like it used to be, it jerks a bit as it accelerates. Any help will be greatly appreciated.

 

[92AWDHX40]

could be a boost leak do a test, how is it tuned? how is the maintenance on the car.

 

[iguanahotsauce]

I keep up on all the maintenance. All the belts were replaced recently, plugs and wires changed recently, oil has about 1000 miles left on it, transmission fluid is good, timing belt was changed about 6000 miles age, new fuel pump, new fuel filter, new air filter, coolant is good. I haven't done a boost leak test in a while. Replaced the large O-ring in my turbo a couple months back to fix a large boost leak. I also replaced the O-rings in the throttle body because those were leaking pretty bad. I did a test after those and it was holding better but there's still a few small leaks I need to fix. It ran fine for a while but now it's not doing so great. I have also noticed my fuel trims are all at around 130% I'm not sure if that's what is causing this though

 

[DSMTyson]

Sounds like its going lean.

I don't really know why it would though. My car did something similar to what you are experiencing when I was running Narrowband Simulation through ecmlink, and had it set up wrong.

I think a bad vacuum leak could cause that to happen too.

 

[EclipseGS-TuRbO]

Something Else you might want to look at is the timing. Now i know you replaced the timing belt but it can jump timing. Just check it and make sure that its good then you can cross that off the list if its good.

 

[demonic racing]

What's your fuel pressure at?

 

[iguanahotsauce]

Timing is good. I made sure it was after I took off the tb to work on it. Also my logger is reading 5 degrees. I don't think I have a huge leak but I don't get great vacuum at idle, I get like 12 - 14 in hg and I was able to hit 9psi with the restrictor removed I haven't tried boosting hard lately. I'm not sure what the fuel pressure is I will check my logger when I drive it to work tonight. I will post the log and a video when I get a chance

 

[Calan]

Also my logger is reading 5 degrees.

All the time, or only while checking the base timing?

Unless you left the timing plug grounded, you should normally be around 9-12* of timing advance at idle.

 

[iguanahotsauce]

It's at 5 when I'm checking base timing. I'm usually in the range of 9 - 13 when I'm driving but yesterday on my way home it spiked to around 30 - 35 degrees

 

[iguanahotsauce]

So the other day wen I was driving my car it started having the issue where when I came to a stop the car would die. So every time I came to a stoplight I would have to put it into neutral and keep the engine revving. It didn't have that issue today when I drove it but it still wasn't running great. In my logs I have noticed the past could times I drove it the timing would be in the range of 18 - 25 and sometimes it would even get up to over 30. Also my knock is usually 0 and I will get a couple spikes of 1 or 2 counts of knock but when it was having the issue of dying and today the knock would jump really high to the 40 - 45 range. I'm not sure what's going on and I haven't had a chance to work on it because I've been so busy.

 

[LOLVTEC]

sounds like you have a vacuum leak, adjust your biss screw, also check your tps i think it should be at 10% on your logger, and the seals on the throttle body can also be leaking. i'm on the same boat, i know whats wrong with mine. the gasket on my tb is leaking, i haven't had time to replace it, but every now and then i have to manually rev this sucker.

 

[iguanahotsauce]

I just finished my last final for this quarter yesterday so now I actually have a chance to take a look at my car and see what's going on. I'm going to do a boost leak either today or tomorrow and figure out where it is leaking. It shouldn't be my tb seals because I replaced those a couple months ago when I did the o-rings in the tb and they were holding pressure fine. I do think my BISS is off though. I need to get a new o-ring for that. Does anyone know what size it takes?

 

[iguanahotsauce]

Alright so I did a boost leak test today and found that I have a huge leak somewhere. It wont hold any pressure at all. All the air was coming out of the hose coming from the inter-cooler going to the TB. I also changed the o-ring on the BISS and re adjusted it so that I am sitting at 750rpm exactly according to my logger. I need to check base timing again, I will do that tomorrow. As for the leak any help on possible culprits would be great as I am lost. I checked my PCV because I thought it could be bad but nope it's still good.

 

[Yelwarc-]

Are you hardpiped or stock? Best bet is perform a boost leak test, get a spray gun with soapy water and spray the areas you best think that the leak could be. When you pinpoint your leak, it will be easy to tell what to do.

 

[iguanahotsauce]

I'm stock. The only problem is I have no idea where it's coming from

 

[SkyGrowsCold]

get a spray gun with soapy water and spray the areas you best think that the leak could be. When you pinpoint your leak, it will be easy to tell what to do.

Spray everything and look for the bubbles. If it as big a leak as you describe you should be able to feel around for the air rushing out than address the issue from there.

 

[iguanahotsauce]

Alright I'm going to go do that now. Could the leak be coming from the inter-cooler?

So I found out that all the air is coming out of the small vacuum line that attaches to the BOV. Where could the leak be if that's where all the air is escaping?

 

[92AWDHX40]

You gotta spray and see thats why we do blt, wherever you see bubbles.

 

[SkyGrowsCold]

Alright I'm going to go do that now. Could the leak be coming from the inter-cooler?

So I found out that all the air is coming out of the small vacuum line that attaches to the BOV. Where could the leak be if that's where all the air is escaping?

That line from your BOV should go into your intake manifold but the only way to be positive it's not T'd into anything else is to trace it.

 

[iguanahotsauce]

Yeah it does go to the intake manifold. What would cause all the air pressure to be released from that line coming from the intake manifold? Because I've done boost leak tests before and after I replaced the o-ring in the turbo I could get the system to hold pressure pretty good.

Anyone have any ideas?

 

[iguanahotsauce]

Anything? I can't figure out what's causing air to leak from that hose coming from the intake manifold and until I fix this leak my talon doesn't want to run very well

 

[cliffkemp]

Anything? I can't figure out what's causing air to leak from that hose coming from the intake manifold and until I fix this leak my talon doesn't want to run very well

If under boost, your car studders above, say 8-10 pounds, it could be the bov not functioning properly and may create a leak. Replace the hose and the fitting in the manifold, if it has one, with a new one and reseal the fitting that the hose plugs into, if it has one, so you know it will be sealed.

Since this is a straight shot passed the TB, it will affect your idle and cause a rich condition under boost. Check all you hoses that go to and from the TB and turbo to be sure they do not have any tears, burn marks, or a collapsed section that may affect flow. Also, check your coolant temp sensor to be sure it is not trying to go out as it can affect how the car starts and idles, to an extent as well. Please, let us know any other things that you may see to fully diagnose the problem better.

 

[iguanahotsauce]

If under boost, your car studders above, say 8-10 pounds, it could be the bov not functioning properly and may create a leak. Replace the hose and the fitting in the manifold, if it has one, with a new one and reseal the fitting that the hose plugs into, if it has one, so you know it will be sealed.

Since this is a straight shot passed the TB, it will affect your idle and cause a rich condition under boost. Check all you hoses that go to and from the TB and turbo to be sure they do not have any tears, burn marks, or a collapsed section that may affect flow. Also, check your coolant temp sensor to be sure it is not trying to go out as it can affect how the car starts and idles, to an extent as well. Please, let us know any other things that you may see to fully diagnose the problem better.

My car is stuttering even when I take off. It accelerates very slowly and is only boosting to about 5lb. My bov isn't leaking, it's somewhere in the path to the intake manifold because all the pressure is coming out of the port on the intake manifold that goes to the small port on the bov. Some seal must be leaking or an o-ring must have gone bad because this is a very large leak and it was not there the last time I did a boost leak test. My coolant temp sensor is good, I replaced it not too long ago because it was bad and my logger is reading correct coolant temps.

 

[cliffkemp]

Have you check all the hoses that go from the manifold to other places including your turbo and BOV? If you have a leak that big, you may have a hose that has a bad tear in it or, you may have a hose that is just off completely. Also, check any vacuum lines as well. What is your air/fuel at idle? Do you have a high idle? If you have a high idle, you have a leak at or after the throttle body. If you have a rich air/fuel ratio, you will have a boost/vacuum leak. Double check all your couplings and make sure they are tight and actually on the piping. A boost leak test will show any leaks you may have.

Once you get the leaks under control, check your plugs and wires for issues. The plugs should be making good contact and if they are not, the wire end of the plug will look as if you burned off the metal. If this is the case, replace the end or just replace the plug itself and make sure to gap the plug(s) to the minimum of .028 or just slightly less as they will gap larger as they run.

If the coils/wires/plugs are not in good shape, you may have a bad idle and off boost acceleration as well.

Lastly, and this is a potential problem that can be overlooked, check to make sure your fuel injectors are all plugged in good. A poor connection can cause one to not be spraying and 'could' cause some of the issues above. If you are having a lumpy idle, this could be the issue.

 

[iguanahotsauce]

Alright So I just finished checking everything. No bad hoses or disconnected hoses. Everything is connected to where it should be. I'm not sure what my air/fuel is at idle, I don't see that on my logger. My fuel trims are all over 100%. The low and high are at 137% and the mid is at 127%. I just now realized my O2 sensor isn't cycling like it should be which could be causing some of the issues but that wouldn't have anything to do with this large boost leak correct? I checked the plug wires which are good and the plugs are good as well. The ends of the plugs are black but the metal and electrodes are still intact and not bent or missing. I also checked and all of my fuel injectors are plugged in. It's not throwing any codes either if that helps.