Fmscell

@oatmealadam did you check the crankcase vacuum, sometimes PCV valves these motors over vacuum & can cause lean misfires.

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Your misfire may be due to carbon build up or a vacuum leak & not actually plug/coil related. Smoke test for vacuum leaks first, make sure the PCV isn't over vacuuming & remove the intake & look at the valves. You may need to walnut blast the carbon off the valves.

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As crazy as this sounds, you most likely have a vacuum leak at the back (bottom) of intake manifold causing the lift control code. I had this same issue on mine. Basically it was a vacuum leak causing the lift control code (bank 2)

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I too would love to know the cost and man hours on this one. My CTT has the same issue, I am getting quotes for 30+ hours labor plus lots of parts, close to $10k total

Hey Cterry77,

I've been waiting to post this, I just got my Cayenne S back from the shop (same year as yours). My issues were a cam code (bank 2) which came back immediately after clearing....caused a weird starting issue (crank/stop...crank/start) & a slight reduction in power. The shop traced the faults to the timing chain being out of sync. They took the intake manifold & valve covers off & re-timed the engine using special fixtures to lock the camshafts in place. Both banks were out of sync, since the intake manifold was out they carbon blasted the intake valves. Got it back and WOW, what a difference. Loads of power, transmission shifts better, no more starting issues. I forgot just how beautiful this engine really is.... I'm not saying that you're problem is the same as mine but my issues were solved :)

Hi all,

Sorry for the late response, as for the work I described above, not too many parts here (intake + valve cover gasket sets, misc parts etc) probably totaling $250-300ish? Labor is roughly 8-12 hrs worth. The teardown is pretty much taking out the fuel injectors, intake manifold & valve covers, there are access holes to adjust the chain & while you're there carbon blast the intake ports (a must!). 30+ hours to do that work on a 4.8L sounds like much, IMO......Make sure the mechanic or garage you take it to has the fixtures to lock the cams on this type of engine, you want someone who's done this type of work before. These engines are like swiss watches, very precise & sensitive.

Hope that helps?!

Curious, how many miles are on the Pig, oil change intervals, what oil are you using? First I have heard about it on the 4.8 but I guess some of them are starting to get up there in mileage now too.

The pig has 200km, I bought it from a friend with the CEL cam code on (I'm the 2nd owner). Mobil 0w40 services every 10-15K, I just changed it to Liquid Moly 10w60 RaceTech (runs better, doesn't burn). The crazy thing is he said this light was on since almost the beginning when he had it serviced at the dealer for something, which made me believe that it was a bent reluctor ring on the cam, but it looked good? I don't know.... this is why I asked if anyone has had any similar experiences with this. I have almost 20k in receipts since the beginning so I don't think it's been neglected.

UPDATE :

I recently got my Cayenne back from the shop & I want to report that my issues have been solved. The tech confirmed that problem was with the cam timing (both banks off) & proceeded to re-time the engine by locking the cams using a special fixture& re-adjusting the cam sprockets back to factory spec. While the intake manifold was off he carbon blasted the intake & replaced the plugs. The result.....no more engine light, smooth start up, quick snappy response & smoother transmission shift. Happy customer!

So I've searched and searched and haven't seem to find the answer I'm looking for. A few weeks ago I got an O2 bank 2 sensor 1 code. Figured it was bad gas or dirty injectors. Ran some cleaner through it and a few fresh tanks. Last week it started idling rough and surging in park and drive at a stop. Acceleration was good but could still feel a rumble so I pulled the codes again. Had a misfire on cylinders 4-6, random misfire code, O2 still cam timing and such. Changed the plugs and coils and air filter. Still having the same issue. I've checked the plugs and check the coils and all are good and seated. Checked the connectors and they are all pressed in firmly. As I've seen some talk about the battery I have checked it. Voltage was a little low so I had it tested and found it was bad and replaced that. This all started about the same time the temps out here started to drop. Also checked the gas cap and that looks fine as well. Cleaned off the seal on it and made sure it was tight. I've built plenty of cars in my life and tuned as well but this has me stumped. Any suggestions are welcome. Here are the codes it was throwing before I did that work.

P2254

P2a03

P0442

P0014

P0300

P0305

P0304

P0306

Still throwing the P2254 code, P2a03, P0442 and a P0017. I doubt the cam sensor is bad and with the surge in idle I'm sure the computer is trying to correct the timing the best it can do. I haven't changed the O2 sensor yet because after seeing the plugs and coils I don't think the O2 is bad just been reading a bad mix coming from those 3 cylinders. Spoke with someone today that thinks it might be a bad hydraulic tensioner for the timing chain. Any helpful insight would be great.

Thanks

Hey Cterry77,

I've been waiting to post this, I just got my Cayenne S back from the shop (same year as yours). My issues were a cam code (bank 2) which came back immediately after clearing....caused a weird starting issue (crank/stop...crank/start) & a slight reduction in power. The shop traced the faults to the timing chain being out of sync. They took the intake manifold & valve covers off & re-timed the engine using special fixtures to lock the camshafts in place. Both banks were out of sync, since the intake manifold was out they carbon blasted the intake valves. Got it back and WOW, what a difference. Loads of power, transmission shifts better, no more starting issues. I forgot just how beautiful this engine really is.... I'm not saying that you're problem is the same as mine but my issues were solved :)

Engine mount (s)?

Curious, how many miles are on the Pig, oil change intervals, what oil are you using? First I have heard about it on the 4.8 but I guess some of them are starting to get up there in mileage now too.

The pig has 200km, I bought it from a friend with the CEL cam code on (I'm the 2nd owner). Mobil 0w40 services every 10-15K, I just changed it to Liquid Moly 10w60 RaceTech (runs better, doesn't burn). The crazy thing is he said this light was on since almost the beginning when he had it serviced at the dealer for something, which made me believe that it was a bent reluctor ring on the cam, but it looked good? I don't know.... this is why I asked if anyone has had any similar experiences with this. I have almost 20k in receipts since the beginning so I don't think it's been neglected.

Happy New Year! just to update, VVT actuator + cam sensor did nada... code came back right away. I was looking at the camshaft signals with the scan tool & it shows bank 1 having a 2 degree "out of target" reading (should be 130deg, reading 132deg). Looks like the bank 1 cam timing chain has stretched. Time to save up, lol!

Hi everyone,

I'm a happy owner of a 2008 Cayenne S. I have been living with a chronic CEL for a while, codes P0016 + P0344 (P0016 comes back immediately after clearing). It's related to intake cam position timing on bank 1. I'm hoping (more like praying) that it's not a stretched timing chain, I haven't read up on anyone doing many timing chains on the 4.8L, so I'm going to "reluctantly" throw a Cam Position Sensor & Variable Valve Timing Actuator at it & hope for the best. While the cam sensor is removed I will inspect the hall effect ring on the camshaft that many believe bend, causing erratic cam signal codes. I also have an intermittent starting issue I hope is related to this (computer not seeing cam position on bank 1??).

Any Cayenne owners out there that have had these issues before & could share any info would be greatly appreciated.

Thank you!

Hi everyone,

I own a 2008 Cayenne S, been living with a chronic CEL for a while, codes P0016 + P0344(P0016 comes back immediately after clearing). It's related to intake cam position timing on bank 1. I'm hoping (more like praying) that it's not a stretched timing chain, I haven't read up on anyone doing a timing chain on the

Please read below:

Hi Guys,

Just wondering if anyone on the forum has a Denison or M0bridge setup on their PCM. I own a 2008 Cayenne S & I am looking (mainly) to have bluetooth cell phone & AUX capabilities. Not sure if you would recommend one over the other or if there is anything I should be looking for? Any info would be greatly appreciated.

Cheers!

Efficiency or mixture codes are usually the cause of something other than Oxygen Sensors (degraded Cat, engine misfire etc). I would agree that the O2 sensor is not at fault..

Sounds like you verified the problem when you boosted it. I'd say it's a battery, but you'll need a multimeter to measure the voltage drop when cranking

Take the battery out.

Blow air from a hairdryer across the fob on low heat for five minutes.

Reassemble fob.

Good Luck.

+1

water & moisture will conduct electricity across a circuit board but once dried out completely should be restored.

Usually cat efficiency codes signal a bad cat converter. Slightly less miles & I think that would have been covered under warranty (80,000kms or 7 years?)