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MY2000 C2 Tiptronic Cabriolet, stock intake, around 70k miles.
I changed out the coolant tank about two weeks ago. During the tank install, I broke the oil filler tube. I wrapped it tightly with Gorilla tape as a few people had mentioned that as a temporary fix. I've driven the car about 250 miles since then with no issues. I detect a bit of gasoline smell in the exhaust but I'm not sure if it's my imagination since I had to disconnect the fuel lines during the tank R&R and I'm a bit paranoid after I work on my car. There are no black deposits on or near the tailpipes. Yesterday I was driving and was very low on fuel. I noticed a slight shudder every 15 or 20 seconds while I was idling at a traffic light. I filled it up as I thought maybe that was causing the shudder.
When I got home, I cleaned the MAF with MAF Cleaner. I started the car briefly and it seemed fine.
Today I pulled the car out and it was running rough immediately . Within about a minute I got a CEL P0301 - Cylinder 1 Misfire. It didn't rain yesterday but the humidity was close to 90%
I had changed out the spark plugs about 20,000 miles ago but didn't replace the coils at that time, which I assume were original. I just ordered new plugs and coils and will install them when they arrive.
Would a bad MAF or leaking oil filler tube trigger a misfire on just one cylinder?
I was planning on delaying the oil filler tube replacement to next year when I'll have my Indy replace the 7 year old LNE IMS and the AOS.
Is there anything I can check in the meantime?
I am having an intermittent misfire issue with my 996. It started a few months ago, when the battery ran down after not driving it for a few weeks, and I had to jump the car to get it going. After a few miles, I got a CEL and the car started to misfire. Upon arriving at my location, which was just a short distance away, I turned off the engine and went about my business. Upon returning to the car, it ran fine. No CEL and did 65mph all the way home, which was about 20 miles away.
All was good, until a couple of weeks ago, when on a slow drive, I got a misfire and the CEL came back on. I made it to a gas station to fill up, expecting it to clear again. This time it did not, and I limped it on home. After a couple of days, I went out to diagnose and checked codes. They were:
P0300- PFC 507 – Misfire detected
P0301 – PFC 508 – Misfire Cylinder 1
P0305 – PFC 513 – Misfire Cylinder 5
P0303 – PFC 512 – Misfire Cylinder 3
P0304 – PFC 511 – Misfire Cylinder 4
These are on both banks.
After a couple of days, I went out, cleared the codes, and the car ran just fine. No CEL and smooth running. I drove it a couple of times, without incident.
However, today, I went out to drive the car. Went a short distance…all was fine. When I got back into the car, I once again had misfires and the CEL came on. Checked codes and all I have is:
P0300- PFC 507 – Misfire detected
P0301 – PFC 508 – Misfire Cylinder 1
The only thing I can think of is that it must either be related to a low voltage battery messing with the computer or somehow related to moisture, since both incidences occurred around having just completed a rain storm. The car was not driven in the rain. This would possibly point to bad coils.
I have checked the MAF, but disconnecting the plug, when it was misfiring. No change in idle.
Seems strange to have multiple Coils fail at once? But possible. Same with spark plugs.
One item of note. This is a replacement engine, replaced by Porsche, due to an engine failure while the PO owned it. The current engine has about 30K miles on it. I am not sure if all the maintenance parts were replaced, such as AOS, coils, plugs, and so on.
Any thoughts on what to check to help narrow down the issue, other than just replacing everything or taking it to the repair shop?
By hugo kohl
1999, 996, 117k miles
Due to leaking I recently changed my coolant reservoir tank, which involved disconnecting and re connecting 2 fuel lines.. Upon restarting the car I had a rough idle and CEL. I purchased a $100b code reader, read a bunch of stuff online and decided to clean the MAF sensor, change the air filter, spark plugs, plug tubes and coils.
upon today's startup I get an erratic/rough/low rpm idle, flashing CEL and the following codes:
P0102 mass air flow circuit low
P1319 misfire emission related
P1318 misfire cylinder 6 emission related
P1315 misfire cylinder 3 emission related
P1313 misfire cylinder 1 emission related
Somehow I went from a leaky tank to some bad stuff based on a do-it-myself moment.
I wonder if the coil packs might not be perfectly seated?
I'm thinking a new mass air flow sensor and all four O2 sensors need replacing??
Rough idle + Code P0301after tensioner pad / camshaft work and what is correct " Actual angle for camshaft " spec?By Los996
This is a continuing repair to what started as a camshaft deviation out of spec leading to the replacement of the chain tensioner pads / brake pads / chain ramps on my 2000 911 - 996 5-Chain engine. Seen here:
That odyssey has since been resolved but I now have a new issue.
Removed camshafts, readjusted the camshaft chain timing "marker" positions, replaced tensioner pads, reassembled everything per factory specs.
On first start up got very rough idle and bad misfires. At first I thought it may have been my timing was off but went back and visually inspected all and all looked correct (visually). Upon further inspection realized parts guy had given me Bosch 7403 plugs instead of Bosch 7413 (2000 Porsche 911).
Switched out and installed the correct spark plugs and no more continuous misfires / backfires. Did the initial reset (wait 1 min with ignition on / turn ignition off / wait 10 sec) On the first start up it did misfired / back fired once but I assumed that was left over fuel.
Car now runs but very rough and threw 2 codes:
- P0300 : Porsche Fault code 62 - Misfire damaging cat. converter
- P0301 : Porsche fault code Cylinder 1 misfire damaging to cat. converter
Also, took these readings:
Actual angle for camshaft bank 1: -12.53
Actual angle for camshaft bank 2: 3.05
On positive note the main reason for doing all this work was the original problem / issue of tensioner / brake pad wear which was giving me a -10 / -2.92 reading is now:
Camshaft position 1 deviation: 0.00
Camshaft position 2 deviation: 0.00
So the question is now are the Actual angle for camshaft readings within specs and could incorrect timing be attributed to these new issues?
And... Do I have to give the DME time to "relearn"?