yeah hopefully thats all it is, given that i've paid for them already And at least its made me look at other stuff, and seen how desperatly the POD needs changing. Will try and get it in somewhere this week. Cheers guys. Always good to sound these things out, even if some of it is beyond my mechanical knowledge, it's all good learning
Most probably O2's but check voltage on TPS If TPS is off voltage at closed throttle, the REVS go backwards then forwards. O2s cause probs between the REV range you are describing.
my so far failed remedies to what is EXACTLY the same problem you're having, ugame: - fuel filter is a a new oem unit, and is only around 3000 km's old. - i have an apexi pod filter. Around 5000 kms old but still very clean - injector connectors etc have all been cleaned and retensioned culprits i'm gonna knock off in order until something works - put in my new o2 sensors - if that fails, then check afm and tps. it's weird cos if you just gun it up through the gears it won't happen. So yeah never at WOT. And seems worse when it's hot. Today was hot and by the time i was getting to work, cruising at 60 it was spluttering something shocking. Sat at 65 and it was a bit better. What does detonation feel like? I'm concerned that it may be that but i have no experience in this area. i hope i find the solution soon but i'll let you all know when i do
detonation isn't a feeling but rather a noise, like a few rocks being shaken around a milo tin.. or is that pinging?? haha someone should be able to tell you
If you think it is O2 sensor related just unplug them and see if it helps. My bet it has nothing to do with the O2 sensors, those symptoms just don't align to it. What it does sound like is either the fuel pressure regulator or more likely, the fuel dampner. I remember Caz had this same issue a while back and when she replaced it all was good again. Wizard went even as far to remove his and has not had an issue since. Try disconnecting the vacuum hoses from each of them and see if anything changes.
All K&N filters are reusable for example, they're designed that way. http://www.knfilters.com/filtercharger.htm
but remember it happens while cruising at either around 60 or 80 clicks. Is it wise to unplug the 02 sensors or some vacuum hoses while driving?
and talk on my mobile. Ok when my pay goes in i'm gonna get a new fuel pressure dampener and regulator. Might as well, as far as i know they've never been replaced, so it can't hurt.
If your on a budget, get some EFI hose (5/16"), remove the fuel dampner and connect the hardline before the dampner and straight to the fuel rail. This will eliminate this as a problem and save you some cash if this is not the issue. As for the regulator, just disconnect the vacuum hose from it and go for a drive, no need to do it mid flight, before you start the engine will be fine.
I wouldnt suggest doing that, if the fuel pressure regulator is bad fuel can piss out of that top vacuum line. Probably not such a good idea to have this happening whilst driving!
Well, lets add some initiative then and disconnect and clamp the hose at the PRVR solenoid so it doesn't leak
anyway....... grabbed a mates Laptop so will check for codes tonight and post. He also suggested pulling apart the connector for the AFM and giving it a good clean and checking for loose wires so will do that too. Toms also got back to me so hopefully have O2's in soon....well before christmas :S.... before the cruise on the 15th??????
ok Rigged up the lappy. 1) No error codes 2) TPS seems fine from what I can tell. On when not touching throttle, OFF when I am I did a log, and along with some high revs, I also concentrated on the problem region (around the 3K mark) The annoying thing about this log is, it only shows what 1 of the O2 sensors is doing (or a mix of both? u tell me) I hoping this will make more sence to one fo you than it does to me....... http://www.amnet.net.au/~chriswinter/cars/chrisdatalog.xls Hope someone has breif moment to look at it with a knowedgable eye.... even if you just scroll down to the 2-3K rpm rang I also took a look at the AFM connector but its all nice and clean On another note... at start up she did spit some black sooty stuff with water onto the drive behind both exhausts, and a little more when WOT, but cleared. Im taking it thats due to WOT and running rich anyway (which as you will see from the log, shes constantly rich once the throttle has been pressed.
OK to hopefully avoid some mucking around I have the same problem with a manual TT. It had a really loud back fire and have a massive flat spot to 3000rpm too. Car idled perfectly. My car doesnt ping either I have changed: AFM PTU Damper Cleaned CTS New Plugs Check Coilpack connectors New Fuel Pump Checked ECU in another car No errors logged Throttles cleaned with carbie cleaner Crank Angle Sensor Driving with fuel reg by passed. None of these things made any difference for me. What did make a massive improvement was replacing all the coilpacks. It still does have a flat spot and it back fires a little when cold for a little bit till the engine is warm. Putting a Greddy multisensor thing on the consult port (which can show individual 02 sensor readings at once) shows that one 02 sensor's voltage flys between 0.02v and 12v. The only other thing i havent tested for is boost leaks so IMO it will likely be a combination of the two. Hope that saves you some time.
Dont get me wrong, it's a good test for a faulty FPR just not driving around like it! lol I've diagnosed a bad FPR this way on a mates car. With the car idling, disconnect top vacuum hose, fuel squirted out a bit = FPR bad. It's not overly common but it does happen.
Update Quick update.... Filled up yesterday and i swear, by the time I'd driven from Wangara to Quinns Rocks (about 20 mins) it started to behave. Picked up O2's from Toms (nice to meet you), and driving home felt fine. Even got into a tussle with a commadore it was driving so well. So started to wonder..... Had it been a bad batch of fuel? Had i acidentally put in 91 and not 98? (as i nearly grabbed the wrong pump yesterday hence why i thought of it) Checked my reciepts once i got home, but no... last fill up was 98, so not that. So then took it out to the shops last night and it was back to driving like shit. So it was just that i had driven it for a time that made it "happier" it would seem. Also, I note this...... From cold start...... Driving through 1st = Fine Driving through 2nd = fine Hit 3rd at 2.5K's and it turns to shit Then its shit through all gears, even back in 1st and 2nd..... so im thinking an electronic issue for sure. The rev range effected has also increased to well into boost range . 4K it was still shit, but not all the time. Anyway, its booked in at Tenargah on Tuesday for the following: 1) Full service inc fluids and filters 2) New POD filter 3) Check sparks (they are iridiums so im told but have asked them to check them to make sure and replace if required) 4) Throttle Body Clean 5) install O2's Im hoping the above will fix it. if it doesn't and if they dont know whats wrong, I'l reset the ECU so it can re-learn and see if that makes a diference (unless anyone has strong advise against doing this?) Fingures crossed guys.... Cruise next weekend... REALLY want to be there
