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Messages - powow66

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Turbo Tuning / Re: Idle Issues
« on: July 13, 2016, 03:39:14 PM »
Update on my build. Found that my FPR had a steady leak from its diaphragm which explained my rich idle. Furthermore I decided to delete my traction control unit all together because I found post MAF leaks at the ASC throttle body. Beforehand I had also been throwing a TPS fault code after about 10-15 min of highway driving, even with a new TPS. The traction control delete has since prevented that TPS code from coming up again. Stalling cold start I dle issues have subsided! The only thing now is my confusion with the idle fuel maps, because once the car is warm I can't seem to lean out the idle AFRs from any changes from the idle fuel maps alone. The car currently runs at 10.9-11.1 AFR at idle....am I missing something?

Turbo Tuning / Re: Idle Issues
« on: March 23, 2016, 09:19:59 AM »
I will also try grounding the ecu once I get back from school in May. As for another update, before I left for break my "new" pump decided to quit on the car...time to order a Walboro 255!

Turbo Tuning / Re: Idle Issues
« on: March 09, 2016, 03:03:53 PM »
MIGHT HAVE FIGURED IT OUT. Don't hold me to this being the only solution, but it turns out despite my vaccum reading -22mmhg, I changed my injector seals with oem ones and lubed them up with Vaseline. Popped them back in and despite the fuel rail being empty of fuel the car started quickly and didnt stall out!! The car now idles pretty good with the o2 sensors on, fluctuating between 13.9-15.7 AFRs at 13.5 degrees of timing advance. Maybe I'm having good luck with the warm weather in Massachussetts, but I'll update in a few days to see if anything changes! I hope this helps guys!

Turbo Tuning / Re: Idle Issues
« on: March 03, 2016, 04:25:29 PM »
I'm sorry to hear that Chris91e30! I might change my tps sensor as well and maybe mess with some timing because that's where I'm at so far. Ill post of any headway I make once I go home for spring break this weekend. Is there any way to tag Brody or MillerP to this thread? I've been trying to contact them over the phone and email with no luck  :-\.

Turbo Tuning / Re: Idle Issues
« on: February 08, 2016, 08:46:04 PM »
Quick random thought/update: upon doing some research of the VANOS system (for my engineering research paper ;D), I realized that the vanos system retards the intake camshafts at idle. Getting to the point, I've never turned vanos ON, or set it at any of the VANOS control tab functions since I got the car running. Could selecting the "5300 (stock)" tab help with the issue or not at all? Cheers

Turbo Tuning / Re: Idle Issues
« on: February 03, 2016, 12:04:29 PM »
Thanks for your input bulletholez!

In regards to my BOV, I've tried clamping down the vacuum supply so that it would stay closed at idle just to further diagnose my issues with no luck. I do agree though that turbulence could be an issues, which is why I'm in search of a stiffer spring for it. To answer your ASC question: Yes, my car came with it from the factory, but I don't think I switched the plugs between the TPS and the ASC (since there's no check engine light whatsoever). I doubt any of the WAR chip/turbo kit hardware is faulty, but rather we have some mechanical issue we're overlooking  :-\.

Unfortunately I'm not gonna be able to further diagnose my issues until early March (my spring break from college), BUT the things that I am planning to do are:
-Replace the TPS sensor (I took resistance values and didn't get exactly a variable 1-4kohm upon opening the throttle, but more like variable 1.45-4kohm. Not sure if that's enough of a difference to need replacement, but I thought I'd do so to rule it out as being part of the issue).
-Check for Vacuum leaks (I'm gonna start by doing the old brake cleaner trick, spray around intake plumbing and observe for idle surge to find a leak)
-Unplugging the ASC (if that does anything)
-Check compression values
-Check Fuel Pressure/change fuel filter
-Trying different Crankcase vent methods (I'm not sure if I'm pulling enough of a vacuum from the crankcase, nor am I sure if that could contribute to the overall idling issue)

Regardless, I'll also stay active for any updates you may have (forgive me for delayed responses, for I am overloaded with schoolwork/work/etc.) and will post further any headway I make as well! We got this!

Turbo Tuning / Idle Issues
« on: January 08, 2016, 08:44:53 PM »
Hey guys!

New to the forums, but have been reading through lots of threads and you guys have helped me a lot with my build!
I've spoken on the phone with Brody, and first of all I'd like to say I'm very happy with the m50/s50 turbo tuning kit. The WAR chip software is an amazing platform that has extended my knowledge of cars tenfold. So far on the base tune my car pulls great at 9psi, and I've been successfully playing around with the tune to get the AFRs around 12.5 at WOT. Part throttle the car is settling nicely around 14.7 at cruising speeds.

HOWEVER here's my current issue which is related to this thread ( http://forums.millerperformancecars.com/index.php?topic=65.msg241#msg241 ):

-When I cold start the car, I need to pump the throttle right afterwards because it seems like the car has fuel starvation and wants to stall out. The car will then idle fine and start to warm up, but I notice that my AFR's slowly drop from ~14.7 all the way down to about 10.9, which is way to rich I think.

-Additionally, the idle tends to lean out intermittently and the car stalls once its warm. Doesn't matter if I drove it around or not, I need to feather the gas so that the idle will hold. From what I've been told by the admins at MP and from what I've read, I do think that the O2 sensor is overshooting the fuel corrections to bring the AFRs to 14.7, and that by changing the idle fuel values, I can minimize how much correction is needed to smooth out my idle. The AFRs once the motor is warmed up hovers at about 11. My current issue lies here, because so far I've tried changing the idle fuel values on the base tune from 100 down to 70, but once rewritten I see no change in the AFR's, it even drops a bit down to 10.8 occasionally. Turning the O2 sensor off hasn't made any noticeable affect, but I will continue playing with the fuel map and O2 sensor tab tomorrow to see if I make any progress!

Here is a list of the major components of my build:

0.120" MLS Head Gasket
ARP Head studs kit
Precision 5858 turbo
Miller WAR chip
60 lb siemens injectors
Miller MAF
CXracing intercooler
CXracing tubular T3 manifold
Tial WG and
Tial BOV (Currently open vent at idle, good/bad?)
3" plumbing
IE Oil cooler cap + oil cooler
AEM wideband O2 sensor + gauge

Replaced components:

O2 sensor
Knock sensors
Camshaft + Crankshaft position sensors
fuel pump
copper plugs (gapped to 0.025")
Ignition coils +boots
Cylinder head temp sensors
Oil pressure sensor
Both timing chain tensioners


-ecu scanned with no codes
-O2 sensors are about 5" from the exhaust turbine of the turbo
-cleaned ICV (strong buzz when key is in the ON position)
-inspected for boost leaks (car idles at about 22 mmHg of vacuum pressure)
-inspected FPR
-fuel pressure will be inspected, because I'm not sure how recent my fuel filter was replaced

Are there any other fuel maps I can modify to further diagnose the issue(I.e CT idle fuel maps, acceleration enrichment) and/or anything I should check mechanically? Any advice/suggestions/input would help me a lot! I'm very enthusiastic about finishing my build, and this is the final thing that needs to be resolved to get my car to the dyno! My apologies for the dense post! I appreciate all the help!

Cheers to a new year!

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