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Thanks everyone who helped with my problem Finally, both the abs/psm, erratic idle and p0102 are all gone. Durametric is telling me there is no error code after driving for 3 days. The problem was solved through 2 leak tests. The indy found around 5 leaks and also replaced a dozen of other vacuum hoses a as precautionary measure. 3-4 leaks were found near the F hose, but the F hose itself was fine. The first leak test showed also a leak with the venturi T piece with part no. 99611065270. So problem persisted for another month while I was waiting for the T piece to arrive. At last, when this T piece that sits just behind the top of the engine oil filter was replaced, all the throttle response and stable idling are back. The car is perfect again, thanks for all the help. I hope my sharing will become a useful one for those who read this post.
I am running stock paper filter and airbox :) The car drives perfectly with some throttle or more. It is only when it idles that rev drops below 800rpm, sometimes it drops as low as 500rpm and the engine revs up automatically. This issue is killing me. Does it sound like a leak or the MAF?
Thanks for all the replies, really appreciated Mine is a tip so no LWFW in this case. Kelvin UMW did my flash and I swear it ran perfectly for almost 5 years until I hit this problem that my indy and I can't solve. To sum up the issue, as long as the engine rev is above 2000rpm or provided that I have some throttle input, no abs/psm light will ever come on. The car drives perfectly only has the annoying abs/psm issue during idling and city driving. I datalog some normal driving and 3rd &4th gear pulls and my tuner thinks they are absolutely fine. Does this suggest it is some kind of boost leak on the intake side?
:help: I am very sad that I still cannot get this problem sorted after a few months. The new MAF 996.606.124.00 I bought from dealer was scratched on the metal film. Faulty MAF pics attached. Now back to the old MAF 5+ yrs old Repairs done Throttle body cleaned Replaced vaccum hoses on top of DVs, metal Y-pipe, the stock solenoid. New stock spark plugs Replaced the 4 turbo and intercooler hoses (car reaches target boost, no power loss at all) Stock hollow wheels n tires Symptoms 1. Abs/psm ONLY comes on whenever there is a small bump, read with durametric, P0102 Hot film 2. Engine rev dropping below 800rpm @ idle (tuner states it should be 800rpm steady) 3. Above 70kph (~44mph) the abs/psm NEVER comes on. 4. Clear code with durametric, P0102 always comes back. To sum up the symptom, the car drives perfectly as long as there is some throttle or at WOT. There is no boost leak or power loss. It sits at 1.1 bar at peak boost and no CEL or any irregularities. Problem only takes place during town driving. Possible issues 1. MAF 2. vacuum leak on the intake side 3 … Can the car possibily have any other possible issue?
Dear RFM, My MAF is brand new bought from a local reputable bosch dealer and it came in its original box sealed. I had a vacuum leak that caused the rev to run high and unstable rev at under 2000rpm. Can I possibily datalog the MAF and post it here for your guys to see if my new MAF is faulty or not? What do I need to datalog? May I ask which wiring are you referring to? Thanks a lot for your help
Failing to get my hands on a compressed air pump, I decided to spray some crab cleaner onto those accessible vacuum and boost hoses to see if I can any suspected leak. It is funny to say that even with the suspected vacuum leak, the boost shown on the dash is stable at 1.1 bar and power delivery is smooth. I do not feel any power loss and the car is still as fast as before according to my accelerometer. Since the new MAF, I have done just over 100km. The car has been occasionally throwing ABS/PSM CEL on the dash and the P0102 Factory Fault Code 115 - Mass air flow sensor, below limit was read. Furthermore, No other fault codes with engine, tiptronic or abs/psm were read by the durametric. Have you got any idea why it had caused the P0102 code? In the attached photos, the 2 hoses that I circled in red are in fact linked together with part of it linking to the great black metal y-pipe that connects to the throttle body. Having sprayed some crab cleaner to these 2 hoses, I found that the rev counter definitely dropped and therefore I suspect there to be leaks. Fortunately, I was told that hose is the breather hose from the oil tanks mounted on the turbochargers. I also sprayed some crab cleaner onto the F hose that connects the 2 DVs, the Intercooler hoses and the hoses on the N75 boost solenoid but found no rev dropping. Do you think this breather hose is the culprit? And should I go out and datalog any particular value to narrow down the issue? Thank you very much for your help :p:
I am running Yokohama AD08 2012 tires on stock wheels at the moment, they can easy take all the power of a remapped 996tt with DV and 200 cell exhaust running 1.1bar. I found them to be excellent on the street and have fantastic wear and grip. It surely is a fast tire as the salesman suggested on tirerack. I have run 5500km and there are still 80% or so tread left in them. The best thing I love about the AD08 is the stiff sidewall that gives direct steering response that matches my old Dunlop D03G R-compound that I had before the AD08. The D03G H1 compound has more ultimate grip but they do heat cycle out far too quickly. I would defo try AD08R the new 2013 compound with the same tread patt as the old.
Symptom #1 Just been out driving and found the car to idle at a around 800 rpm and whenever it drops to around 750 rpm, it revs up to nearly 950-1000 rpm. The whole process simply repeats itself most of the time at traffic light. Symptom #2 happens mostly on highway in 5th gear under 2000 rpm. It does so in 2nd, 3rd and 4th too. The rev counter just goes up and down between 1700-1900 rpm.
Having installed a new MAF 996.606.124.00 + reset ECU, the problem didn't go away. Car has the following Throttle body cleaned & New stock spark plugs, Injectors cleaned with Redline Si-1 3000km ago Billet DV UMW remap 200 cell exhaust Stock hollow wheels n tires My car has developed 3 symptoms recently 1. engine rev hunting @ idle (almost stalled feeling) & 2. engine rev rising and dropping (bouncy rev) under 2000rpm 3. ABS/PSM comes on @ off throttle + bouncy pot holes. To better describe symptom #2, the car drives perfectly at WOT or with a slightly heavier right foot. There is no boost leak or power loss. It sits at 1.1 bar at peak boost and no vibration or engine rev rising or dropping during WOT. All bouncy engine happen rev below 2000rpm at cursing speed. Does symptom #3 suggests new a ABS sensor kit? What should I do to cure symptom #2 the bouncy rev?
Latest report, My indy finally had time to appoint my car. He fitted 2 wedding grade cables which have twice the amount of copper wires than the stock engine to ground cable for me. One from the engine to chassis and the other from gearbox to chassis. The problem has now been solved. Cannot be happier :) Car now seeing close to 14v without AC and headlights, 13.5v with AC and headlights on, hopefully I can see 13.7-9v when the battery is charged from the current 11.8 to 12.6v. Thanks every one who helped, especially to Ahsai who helped tons. :notworthy: :notworthy: :notworthy: Full respect to him, thanks again!!! James
I bought some special tools to see if I could really squeeze my small hands to reach the bolt at the ground strap at the engine side. But, sadly, no matter how hard I tried I just couldnt reach it. So, my only option now is to get my indy to do it from the engine cover tomorrow if he has time. I will report back as soon as I get it fixed.