This is I think the 3rd event over the last month or more. Or find a known good one and swap. Maybe they just cleaned it. Just had new plugs, oil, filter, cambelt, waterpump, not like they're related, but still. Anyhow, while I hope I'm wrong, I believe the error code will reappear however. Checked trim levels, functioning normal.
There are no nearby price competitive Chevron staitons so I'm back to using Shell mostly unless I want to fill up at a Chevron station on the way to work. This suggests a common failure mode at least in the case of my Boxster engine. I checked for leaks in the intake manifold, and did not get any indication of a problem there. I've been using it in the Boxster because I feel it's better for the car than ethanol. As i said white smoke during 5-10 seconds when i start the engine in the morning.
I would be a bit concerned about your using the non-oxygenated gasoline because it could be stale. Unless anyone got better suggestions? While off boost, it would also cause a lean condition. Ssen a good thread about the maf solving this issue so i have ordered that. I need to spend more time here. It seems odd, but I can't think of any other connection. Model: Boxster, Year:2000, Mileage:30000, Type of use:Street use only Replaced the two pre-cat 02 sensors with Bosch.
Not regularly, sometimes fine, sometimes not, even seconds after each other. A leak after the turbos would ofcourse result in metered air leaving the system and rich running, but only while the engine was on boost. Their explanation was that it was either that I didn't use the Porsche Brand O2 sensors or that I just wasn't driving it hard enough. Turns out, there is a gasket by the air filter box that was loose, once it was back in place, all was well. That should give you a clue as to whether or not the engine is running properly, and if there are any deviations from side to side. I replaced spark plugs this week and reran the durometric to see if this made a difference but no change to rkat.
You have 4 sensors, 2 on each side of the exhaust. Also, if you are using an aftermarket oiled air filter, it would be the cause of the P0171 code. But it sounds like the consensus is that the gas isn't the culprit. What motor is in it? The Shell gasoline helped in some way but the cure was to replace the bad loose brick converter. Goodrc- Where was your split fuel pipe? The check engine light went out after a few months.
I really appreciate all the help, you guys are awesome and I've learned a lot! I have had bad tank venting switches and line leaks even bad fuel caps that always set O2 sensor codes along with another code or an O2 code by itself. To satisfy your self, either replace - it is a very easy job. I would especially check the oil separator bellows for cracking, esp. Intake air temperature and coolant temperatures were reasonable and as I expected them to be. This site is 99 percent member supported less than 1 percent comes from advertising - so please consider an annual donation to keep this site running.
The difference is not striking but real. Start around the throttle body, then around the intake tee and it's rubber sleeves. However, the P0430 error didn't go away entirely. The codes indicate passenger side, I swapped the sides of the O2 sensors and codes tripped again saying passenger side, so clearly O2 sensors are fine. I have a detailed article on this here: -Wayne I'm guessing that the bypass pipes are causing this fault code.
I know when I switched from discount premium gasoline to Shell V-Power a P0430 error code appeared much less frequently even though everything else -- but the gasoline -- stayed the same. Not sure what else is likely to cause it? It had been about 400 miles since the light had went on for the second time. A Porsche tech found no intake air leaks but did find a couple of loose leaves in the filter air box and removed them, cleaned the throttle body, and while the engine ran better the P1128 would return. After a tank or two of Chevron Supreme my Boxster engine ran noticeably better after I switched from Shell V-Power to Chevron Supreme with Techron. Jul 07, 2009 I looked on alldata, and my Chrysler site, and there is no P1128 code listed. But it sounds like the consensus is that the gas isn't the culprit. Always use Optimax or Tesco 99, no misfire codes etc showing, new plugs 1 heat range colder than stock fitted but no difference from changing them.
Robbie gasoline discount gasoline to Shell V-Power an intermittent P0430 appeared less frequently. Also tomorrow, I'll take Pedro's advice and check the fuel pressure, although historically, the fuel trim levels have checked out fine. Seemed a little strange but not sure if this is abnormal pattern. Check to make sure all your airfilter elements are in place there is a plastic piece that holds the filter up inside the holder. It did not look damaged and before I got a replacement I added some White Lithium Grease on the old oil cap O ring to help it seal. Why do you suspect the O2 sensors? My engine's coolant temperature was 205F, but I don't think the difference significant.