Has anyone here tried these to resolve fault codes? Seems like a cheap thing to at least try. God knows we have tried everything else humanly possible! My car has an after market muffler that no one knows what it is. I'm thinking this might be worth a go. Any suggestions where to buy? TIA
+1 what codes? "Big daddy's mini cats" (have a search) have been popular with test pipes when throwing cat inefficiency codes. But quite a few have had no joy with these either. Neil at Conti's promised he could get me some O2 simulators (?) but never came through. This was for my de-cat pipes which kept throwing the cat inefficiency codes. There is a list online of all the 360 CEL codes. Worth having.
http://www.ferrarichat.com/forum/143066693-post.html 1k still no cel Sent from my iPhone using Tapatalk
Neils had my car for the past 6 weeks trying to reslove this and the bloody lights still coming on! They are at the end of there patience as well. P1154. I know it's not directly related to the O2, but I'm prepared to try anything now. The light came on yesterday after about 200 k's. I reset it and did the same mileage today and it came on earlier, but it has been a warm day, if that matters. Have you tried the Big daddies? They seem to work for some and not others, but they're cheap.
Graham, i am not a ferrari technician, but I really doubt big daddies will fix the CEL as p1154 is a pre-cat lean condition. This won't change with modifying the post cat readings. If truly lean this is not great for the engine. I know you have been going crazy with this for a while and u thought the cracked o2 sensor was it. So it's either really a lean condition, or a faulty sensor. Have u replaced the upstream (pre-cat) sensor? I believe this is bank 2 (from my quick review) so u can change l & r o2sensors and see if the code changes. Check the list of stuff listed in the WSM, including fuel pressure, intake manifold gasket, injector o rings. Think of anything that would allow more air in the supposedly closed system. would throw in post MAF seal to air plenum, air plenum gasket, and vacuum leak. However there is mixing of air in the plenum and manifold so these would be harder to accept if the code is consistently p1154 and this is truly a bank 2 issue. I have used a bernzomatic torch (unlit of course the ferrari needs little excuse for spontaneous combustion). Similar to carb cleaner, less messy and cheaper. Think of something that would cause more air in the exhaust side like a cracked header, exhaust gasket etc. U could always bring it elsewhere. Emissions stuff is hard enough to figure out, but online is harder especially for someone like me who is no expert. Ray Sent from my iPhone using Tapatalk
It's not only not directly related, it's not related at all. Maybe you need someone who knows how to diagnose a problem?
Graham, if its a lean condition from too much air being introduced into the system and the O2 sensor is picking it up, I know you mentioned in the other thread a hairline crack that they fixed... did they check fuel pressure, did they check the seal around the injector as above? Did they try to replace the O2 sensor (upstream)? If you mask the problem you're not fixing it. And I know you love her more than that!
They used a smoke machine and sorted out any leaks in the system so if it was a header or something that would have shown up then. It was an exhaust gasket and a muffler leak they found then. All O2's have been replaced now. Fuel pressure was checked and normal according to them. The hairline crack was in the thermal coupler, and was replaced. I would have assumed (I know I know) that they would have checked the injector seals though. I will ask them. Thanks
Dude its like a 15 minute check. Undo the bolts holding on the rail and wiggle it out. Check out the seals visually and I think I even put some grease on them when I put them back in to accommodate the seal..
Thanks Kurt I will have a go after work and see if they're OK. I bet they are. Any holy water for sale because that's what this car needs.
To start, it might be good to agree upon the meaning of P1154. Here my interpretation; feel free to correct: The lower, bank 2 sensor is feeding data to the ECU; the ECU is interpreting a lean condition. The ECU responds by triming in more fuel (on a continual basis) to correct the situation. The engine isn't actually running lean, due to the trim. P.S. I just happen to have several liters of Holy Water for sale; PM me if interested.
Let me check out the import regulations re the holy water. I will need to wear a flame proof asbestos suit to collect it, for when I explode into flames. Your interpretation sounds perfect, but what would your fix be? Just out of interest. All sensors have been replaced as well. Thanks
I did not try the big daddies and can't imagine they will help you. The CEL didn't worry me as I knew the cause and just read and erased it every so often. Have hi-flow cats now. Certainly sounds like a vacuum leak. Maybe try the old can of ether trick around the intake manifold!
There are a lot of reasons LTFT can be off. A vacuum leak and fuel pressure problems are just 2. Did anyone reset the parameters and run it with the upstream O2 disconnected? A little hard to see what it is doing without that step. That should be step one in diagnosis.
Brian, excuse my ignorance , but not exactly sure what to look for by doing this. Please educate me. Sent from my iPhone using Tapatalk
Gaskets were done by Forza. Plus Conti did all the checks using a smoke machine and 425 cans of ether or whatever it is they use. Not the gaskets. Cheers
The effect of DTC P1154 is high short/long term fuel trims. The cause of the DTC is what you are after. The fix would have brought the fuel trims down to normal on their own. They sent you on your way w/o confirming that fuel trims were normal. If you have a scan tool that has basic live OBD II data, read us short term fuel trim @idle and under load @ 3000 rpm, and that should give direction on where to proceed. Only the engine computer confirms the repair by not setting a DTC . Fuel trim just tells you if your engine is running rich (less than 90%, taking fuel away), or lean (more than 110%, adding fuel).
Buggar, my OBD scanner is too basic and reads no data. All it does is read the codes, and clear them. Maybe I will look for a better scanner and see if I can get any more info out of her.. Thanks
The DTC suggests the computer is trying to compensate for a problem. Erase the computer compensation, disconnect the ability to perform the compensation and look for the root cause. It is THE first correct step in diagnosing the problem. You have to get the computers corrective measures out of the loop. Until then the best that can be done is to guess and throw parts at it. What is being done here is to diagnose a blood pressure problem while on blood pressure meds.
> To determine a fix, I'd run a diagnostic on the downstream O2 sensors. > The ECU is expecting to see specific voltages from the O2 sensor, for given operating conditions. > Unexpected flow near the sensor, due to leaks (or other things) can result in unexpected voltage sent to the ECU, triggering an error code. > If your aftermarket exhaust is causing altered flow near the O2 sensor, the ECU may not see the expected voltage. > Did the shop that serviced your car check the numbers from the downstream O2 sensors?
Exactly. You can't diagnose a feedback system without breaking the feedback loop. Most don't understand this little nuance and spend countless hours chasing ghosts.
