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All great comments and thanks for posting them. I agree that that the injector shop probably only used low pressure testing since most nondirect-inject systems use lower fuel pressures. And they didn’t operate the injectors at engine temps. So they could have missed the potential issue. I guess...

(long post sorry,, I tried to be concise) I thought I would pass on some recent experience regarding diagnosing a rough cold start and misfire situation. I noticed that the engine was a bit rougher starting than normal (or so I thought), and started throwing a P0302 (misfire cyl #2) error code...

I actually already did. This was kind of a side issue (potentially). And since it was dead-on what I was looking for I figured would ping shiverring directly to see if he found a solution. I have Enki helping me out on the other post.

I am trying to troubleshoot a misfire during cold startup, ( the LTFT jumps to 15, and the vacuum is like 12, until about 30 seconds after start and them it magically drops). The misfire trips the CEL with a Misfire on Cyl #2 code, or general misfire. I posted on here for some help, and Enki is...

I did a smoke test on the intake system, and the only smoke came from the EGR valve at the location indicated. I nabbed the picture from member shivverring; the had the same question: is it normal? or does it need to be replaced?. I asked him in his post, which was a bit dated, whether he...

I know this is an old post, but not sure how to contact shivvering directly (noob). I am trying to track down a crappy idle and high LTFT (perhaps indicating an air leak). I hav the same (smoke) leak that shiverring describes and am wondering if that is normal, or an indication that it needs...

I'm a bit confused about your comment regarding voltage range. The LTFT jumps to a pretty constant, high value (like 14.85) when I take the RPM off of idle. Does than indicate a "voltage range"? I always thought LTFT was an idle-only thing (where the O2 sensors are in closed loop). Is the...

Got it. I'll try to investigate. BTW the cold start bypass trick worked like a charm. I didn't think to take log it to see what's happening, but I'll try to do that in a bit. One thing I noticed is that the LTFT seems to be commanded to max out, and then within one data cycle drops from 15...

That's a very detailed and informative post, thanks for taking the time. I'll recheck for an air leak. If I get ambitious maybe I'll try a smoke test. The new coils should be here on Monday so I'll install them and see if that helps (I am dubious). It seems to always come up with a misfire...

Okay here is a datalog from this mornings cold start up. I did notice a few things (but don't quite understand why it's doing it). -The Fuel Rail Pressure is high and steady @ ~1600 psi, then drops like a rock -The vacuum is crap during that time (9-10 inHg) and then rises up to 20 inHg as...

Thanks for the thoughts. I was hoping someone could check their HPFP pressure; or know off-hand if 1600 psi is normal for the first 20 seconds after a cold-start; so I can check that off my list of weird symptoms. I agree the misfire is not normal. I kinda recall some misfire prior to the...

Recently installed Autotech HPFP upgrade when doing a timing chain on my MS6 (no real mods yet, just running an Accessport Stage-1 pre-canned tune). Dissembled and cleaned everything that the instructions called for during the installation. Now upon cold start the pressure surges to 1600 psi...

Thanks for the feedback. I never heard the TDC tip but I’ll give it a try. I may try to see if I can feel for grooves in the valve cover thru the oil filler, or maybe using an inspection mirror. And in my defense, I was not suggesting an e-Bay upgrade kit. I was referring to a kit that uses...

I replaced the VVT with a full OEM kit @ 49K miles due to noise at start up, and the TSB recommending the updated VVT actuator. I now have 110K and I am now getting a lot on noise when the engine heats up that I believe it is the timing chain (It sounds like a diesel engine at idle). I can...

Just wondering if you install the cables, and how the 60" length worked out. I believe the stock cables are 57" (per prior post), so was wondering if the extra 3" was an issue. Thanks