So my 2008 lnf is running all sorts of weird....I jacked it up to bleed to clutch and after lowering it and drove it for 2 seconds the idle was jumpy then I drove it home and it was super jerky and didnt run or sound right at all. It would boost over 13 psi and wanted to die everytime I would stop.At idle it would almost die and it jump from 20hg to 10hg on the vac side of the boost guage.I also recently had my car at the dealer where they replaced some tranny parts but it ran fine for two days now this!?!?!?

 

What codes does it have?

 

well thats the thing Im not sure if its limp mode because its not throwing any codes what so ever!!

 

ALso the car smelled like it was running really rich it also has the trfiecta budget tune since about 7k miles ago.

 

if its limp mode it will say in the dash "eng pwr redcd" something like that. and you WILL notice.

 

Well no lights on dash , it almost feels as if the charge pipe is loose with added problems but i checked everything and no clues to why jacking the car up and bleeding the clutch would cause it to run rough with limited power and be very jerky.

 

Why did you jack it to bleed the clutch just out of curiosty and where did you bleed it frm? The bleeder port is way easier to access from up top, but to each their own....

Check and double check to make sure you didn't pinch, disconnect or hit anything. It can't be a coincidence that this happened after you bled the clutch.

 

I jacked it up so i could look over my tranny and everything after the dealer worked on it.... I bleed it from the bleeder port with the nipple....I looked over everything didnt see anything but I will be going back through everything because its just random that it started running like this after running like a champ the past two days

 

Where did you jack it from?

13 psi isnt limp mode. Its normal for an untuned car.

 

just inside the left wheel under the frame , not my choice but my buddy already jacked it so i slide under and it was jacked for like 5 mins tops. After bleeding the clutch it ran fine for a quick roll around the block then when i parked it started idling funny and then I started driving and about two mins later it was running like complete trash!Also the car is trfiecta tuned usually see about 22-23 psi.

 

I noticed that when the car is idling (barely) I am getting black smoke and it smells like its running rich ...could it be possible my 02 sensor is bad and I dont know becuase the code is disabled for my dp?

 

not all codes show up on the dash bring it to your local trifecta dealer or if you have your own cable scan it, if theres anything majorly wrong it will tell you. has it been raining alot ? maybe your maf got wet.

 

Somehow, you opened up a huge boost leak, somewhere. See my sig for boost leak test. You're pulling in a lot of un-metered air, so you're running very rich. If you can't run a boost leak test, check your intercooler endtanks for leak (remove bumper cover to do this) and check your coldside pipe for any holes that might have been caused by the infamous bolt.

 

thanks...when it first started acting up my first thought was i knocked a charge pipe loose but when i checked i couldnt find anything loose but I will check again!

 

I un hooked the battery for a while to try that and when it started it ran and idled fine but oncei t was warm and I gave throttle up to the 3k range it began idoling rough again and so i killed untill i can take the front bumper off and really look at the intercooler and pipes.

 

also if it is a boost leak somewhere it would make sense why it wouldnt be throwing any cel codes.

 

It usually does. The problem is, a lot of issues cause similar symptoms. We have to narrow them down and a boost leak test is a good place to start. It would be best if you could actually do the leak test, because the visual method isn't as accurate.

 

Do you have the stock intercooler? There's a possibility of a boost leak through a crack that's maybe hard to find.

Sometimes it takes a certain number of keyturns for the code to set or for a minimum parameter to be met. It may not be meeting either of those. The LNF also has a malfunction mode that causes it to go limp before it would set a code. There's another name for it, but I can't remember it off the top if my head.

Edit:

It's called a Fault Action, and is not always associated with a CEL/code. Here's something that talks about it. http://www.wot-tuning.com/forums/top...des-explained/

 

I have the treadstone intercooler with both stock pipes. I am hoping there is leak somewhere in the pipes but its hard to tell and I am un able to do the boost leak test right now.

 

I did not find anything leaks visually. I started it up and it idled fine and then I drove it deff notice the lack of power I drove around and it did the usuall spit and sputter and when ever I would go full throttle it would hit points where it seems to have a fuel cut off and then it would get a shot of power the cut out and so on. I also noticed it dropped my gas mileage from 23 to 9 mpg and when every i give it any throttle its about inst 8 mpg. Since it was at the dealer last weak for the tranny I might just take it back in and see if its something they could have caused or hooked up wrong since they said this was the first time working on this model car.

 

Your gas mileage est. sucks because it's running so rich. Rev it a little in neutral and see if you register boost. Report back.

 

Yeah its boostting normal untill I hit about 3 grand then it will spit and sputter and then go back to normal......fuel injectors maybe ?

 

I mean, when you're sitting still and revving with the clutch in or in neutral, do you see boost on the gauge? Checking for a crapped-up TMAP sensor.

You need to get to an Autozone or something and get the codes read. That will give us the quickest answer.

 

Im not throwing any codes though.

 

You're not throwing a MIL. You have to have codes, though. They're in there. They just need to be read. If I hook up my HPT right now, I'll see trouble codes for O2 delay, but I don't have a MIL on. It takes a certain number of codes to get a light, although with the way your car is running, I AM surprised you don't have a MIL.