can't lower idle, 139% low fuel trim, high inj. duty

[Dream On]

I realize that I've got a couple separate issues here, but I didn't want to make multiple threads.

#1. I just replaced my intake manifold and tb gaskets, as well as the tb shaft seals and have seemed to fix all of my boost leaks except the pcv valve. I readjusted the TPS using an ohmeter as the Hanes manual says and now I get about 13.6% on my logger using MMCD, so I believe it needs adjusted more. Right?

Since I can't lower my idle any more (at about 1300-1500 RPM) and there aren't any leaks, then I think I need to give more slack in the throttle cable that bolts to the intake manifold. I think I tried to put it back on with little slack not knowing which way was correct. Is this assumption correct?

#2. I was looking at my fuel trims and my low fuel trim is at 139%, while the others are at 100%. Is this related to my problems above or should there be something else I can do? I bought my car with the maf already hacked mad: ) but other than that it the car is mostly stock. I've only driven the car for maybe 10 miles since I've reconnected the battery also. Any input is appreciated. Thanks.

Edit: Just anothering thing I thought of...

#3. My injector duty cycle is around 98% at around 6700 RPM as shown on my logger. I'm only at about 14 psi with stock injectors and ported turbo. Why is this so high?

 

[calreef18]

Yes keep adjusting till you get it right, your logger will back up your adjustment as well. Do try the throttle cable as I've heard of it being put on too tight many times and beings slightly open causing the raised idle condition. As for the injectors, I have no idea why the idc's are so high, maybe because your low trim is so high.

 

[Quasimondo]

That PCV valve looks to be the likely culprit. Your low fuel trim is maxed out because the extra air the leaking pcv is letting in is not measured at the MAS and is resulting in a leaner mixture, causing the ecu to richen it up to correct the problem.

You have high injector duty cycles at wot because that pcv is pissing out your boost. Your turbo is working harder to maintain the 14 psi with this leak, and the mas sees a hard working turbo as lots of airflow, resulting in the high duty cycle.

Fix the pcv asap.

 

[92awddsm]

How is the pcv valve routed? If it is installed properly but the vc vent tube disconnected or vented, this will pull unmetered air and cause ltft to be excessively lean. Either richen up low throttle approx 12% on the afc or reconnect the vc vent hose to the intake pipe. This along with improperly adjusted base timing will cause the excessively high idle even though the biss is adjusted properly.The throttle cable also needs some slack in it before you start adjusting everything else. Another cause for these particular problems would either be a boost leak or im gasket leak.

As for the tps reading on the logger, when adjusted properly, it should read somewhere around 11% on the logger when throttle is closed.

The high idc also brings me back to boost leak, injector seal leak, or im gaskets leaking.

 

[Dream On]

I'll try and fix the calbe, tps and idle today and get back here with results on that. As for the pcv, I've tested three pcv valves by pushing about 20 psi of compressed air in them, and they all leaked. One was new, the other two were used. The pcv on my car is routed stock, connected to the intake manifold. I've heard of using a heavy duty check valve inline with the pcv may fix the leak once and for all. Opinions?

 

[Dream On]

Fixed the idle and TPS, have not yet checked on the injector duty and fuel trims. I'll try and get a log soon to try and figure it out. I'll also try changing the pcv and see if that does anything. Thanks so far.

 

[EuroGSTSpyder]

I have a similar issue so I jump in here...

I have a LFT at 137% and the other two are 100%. I checked this with my logger and it stays rock solid on 137.
Weird parts is that when I had the VC to the atmosphere ( via a K&N breather filter) the LFT was 100% .... But since I was in for emissions I routed it back to the intake as it should be. After a couple of days I checked the logger and the LFT was 137%..?

I also checked diagnostics with thelogger and on Pocketlogger it says O2 sensor is bad( But no CEL) and on MMCD it doesnt appear at all. What is up with that?