'05 Ford Taurus - Vulcan V6 Misfire

Check for vacuum leaks, particularly in the PCV and its hoses and intake manifold gaskets on Bank 2. Take out those platinum plugs and replace them with the plugs that the mfg. calls for. Good luck and keep us posted.

The Vulcan is a solid engine. I've got one with 305,000 kms on it. Had a few misfire codes, when plugs have been found to be worn or loose. With this engine & EDIS lost spark ignition, the type of plugs are very important. Put in either Motorcraft or Autolites double plats. The PO174 is not very common on this engine, however you may have an air leak or a fuel restriction. There are a huge list of things to check for this code. Yours is only detected on bank 2 though. (Driver side). Check LTFT2 it should be close to 0...... +-4%. If air leaks it will read in excess of this, like +10% or so. Fuel System * Leaking/contaminated fuel injectors. * Low fuel pressure or running out of fuel. * Fuel supply rail restricted. * Fuel rail pressure sensor (incorrect reading). Air Induction System * Air leaks after the MAF. * Vacuum Leaks. * PCV system (leak, valve stuck open, etc.) * Improperly seated engine oil dipstick. Exhaust System * Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).. EGR System * EGR valve tube/gasket leak * EVR solenoid vacuum leak Secondary Air Injection * Damaged/malfunctioning secondary air injection system (mechanically stuck valve). Not the easiest problem to find! Happy troubleshooting, Aeroman.

05Vulcan, I am in a very similar situation. I just purchased a 05 Taurus. It has 115k on it. I got a CEL the other day after a misfire on a cold start. I live in New England and it was 5f that morning. The engine "stumbled" slightly but recovered after about 2 seconds. There are no drivability issues. The engine otherwise runs smooth. The CEL went away after 2 days. I scanned the PCM and came up with P0300 (misfire during startup) and P0316 (random misfire). I cleared the codes. This morning (very cold again... about 15f) It "stumbled" again on initial start followed by a CEL. The one very common issue with the Vulcan and misfires on a google search is the Cam Position Sensor. It is a common fault and can cause P0300/P0316. It is a cheap part (about $35) and is easy to swap out. The only thing that doesn't make sense to me is that this only happens to me on a cold start. Logic tells me that it is more likely to be a EGR or vacuum issue that causing a momentary lean condition on start up. This would also cause a P0300/P316. My plan of action is to swap out the Cam Sensor and start the process of elimination. I will let you know what happens.

I was able to figure out my problem this weekend, Thanks to another forum member from the Taurus forum. I purchased that Bosch oil filter and used the gasket (o-ring in this application ) and wiped some Mobil 1 synthetic grease that I have to lube the entire gasket and installed it on the "transducer" type assembly. The transducer, (I call it this as I have similar assemblies on my diesel MB that control the air flow in the take manifold in relation to RPM), came out easily when both screws were removed, practically fell out. When re-installing with the new lubed gasket you could feel that there was a "seal" in the making as it was approaching it's final resting position. *NOTES* When comparing the old gasket with the replacement, the replacement had a slightly smaller diameter, but not too big of an issue as it slightly stretched and fell into place perfectly. The original gasket is rounded, while as the oil filter gasket is square. When we put the car back together and fired it started nicely but was still the noise of vacuum somewhere. I re-sprayed this transducer mating point again and no change in engine response, so I knew it was not that. After the car warmed up the vacuum noise ended up dissipating drastically and it didn't appear to return in full force. So we carried on. The engine upon re-firing did not stumble, miss or vary in RPM's as it was doing previously. We took a ride to see how the engine performed and it is NOTICEABLY smoother, more linear engine response. Keep in mind, that to gain access to that transducer, you need to remove the passenger side cowl, top and bottom. Very easy! And if you haven't replaced your cabin air filter, now is the perfect time. Hope this helped. Try this befrore you play with the Camshaft Position Sensor. On to some PIX!

05Vulcan, Can you point me to the thread in the Taurus forum that solved your problem? I have read your last post, but I'm slightly confused as to what part you replaced.

http://taurusclub.com/forum/index.php?s ... t&p=703964

05Vulcan, Did you figure it out?

05Vulcan, Thanks for the link. The pics are very good. Glad to hear this clears up your problem. I visited the dealer today for the gasket. It is not sold seperately. The entire assembly is $61 and they woud need to order it. I'll get the O-ring from the Bosch filter. I sprayed brake cleaner while the engine was running, but did not get any response in rpm. I'm not ruling it out yet though. Your symptoms where too similar to mine to be just a coinsidence. The O-ring you used was snug enough even though it doesn't have a rounded profile?

05Taurus wrote: 05Vulcan, Thanks for the link. The pics are very good. Glad to hear this clears up your problem. I visited the dealer today for the gasket. It is not sold seperately. The entire assembly is $61 and they woud need to order it. I'll get the O-ring from the Bosch filter. I sprayed brake cleaner while the engine was running, but did not get any response in rpm. I'm not ruling it out yet though. Your symptoms where too similar to mine to be just a coinsidence. The O-ring you used was snug enough even though it doesn't have a rounded profile? I bet if you put the o-ring dimensions on McMaster Carr you could find a replacement for that OEM o-ring. I made sure to lube the oil filter gasket with grease (I used some Mobil 1 synthetic grease I had laying around, good general purpose grease). When installing that oil filter gasket, you need to stretch it some, but it does fit snug. If it was to be perfect I wish it was 1-2mm thicker, but you could feel it sealing as I was re-installing the assembly into the intake manifold. You can spray any vacuum fitting going into the plenum to check for leaks. On mine it was clear that my gasket was leaking as the RPM's dropped instantly after spraying the starter fluid. Good Luck! Don't rule out the plenum gaskets. They seal the upper intake manifold with the lower intake manifold. They are circular and I purchased a set on RockAuto.com

Hey guys I have a 2003 DOHC taurus and it has 222K miles I am proud to say. What I am trying to figure out is where is that part on my car. I have the same P316 code and have change plugs and wires. Also, what is the part called thanks for the quick response.

*UPDATE* The replacement seal IS available from the stealer. I bought one and installed it as the seal with the "temp" fix was starting to leak again and not throw codes, but similar syptoms. Part #: 87072 S91 It's referred to as a "seal"

05Vulcan wrote: *UPDATE* The replacement seal IS available from the stealer. I bought one and installed it as the seal with the "temp" fix was starting to leak again and not throw codes, but similar syptoms. Part #: 87072 S91 It's referred to as a "seal" I understand about the seal, but what is the part that you a pointing to in the second picture. I am referring to the part that is big and looks round. The reason I am having a tough time, I have a DOHC motor and the setup is different Thanks in advance

Jamaica1997 wrote: I understand about the seal, but what is the part that you a pointing to in the second picture. I am referring to the part that is big and looks round. The reason I am having a tough time, I have a DOHC motor and the setup is different Thanks in advance The part I am pointing to you do not have on the DOHC engine. This topic is discussed on TCCA.com