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Thread: 2005 zx3 2.0 Duratec stutter/shudder Reply to Thread
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Topic Review (Newest First)
02-22-2013 08:29 PM
moonlitdriver Update. Pcv hose fine. Turns out was bad axle and passenger engine mount. Runs like new now. Thanks for suggestions!
01-30-2013 01:46 AM
moonlitdriver New boots and ap104 gapped at .55 seemed to help mpg but not the stutter under load. Seems worse when car warms up. Almost nonexistent when first started this morning. Haven't gotten around to look further into the pcv yet due to busy schedule (and home repairs)
Thanks for the tips
01-22-2013 11:07 AM
moonlitdriver After I get the new coil boots on I was going to replace serpentine belt. Alternator could be part of issues, at times car does "dim down" at low rpm, and didn't used to. I thought I checked PCV hose, but I may have been grabbing on the wrong one. I'll check again tonight. Thanks for the suggestions.
01-22-2013 05:56 AM
whynotthinkwhynot Before you go tearing into the internals of the engine, why not pull the serpentine belt and check the rotation of the pulleys. You can also consider the alternator. Those tend to go out around 100k -120k.

You can also check the PCV line. Some FF's have reported it to be split causing idle and running problems. It is not easy to reach. It is located between the intake manifold and the engine block. The PCV valve itself is up above where the oil filter is in a black box. Follow the short, 6" tube from that black box to the intake manifold. That's the PCV line. You should be able to grab it and tell if it is split.

Tumble flaps are the cause of the "valve noise" sound, and probably not much else. Mine have been bad since around 100k, and I now have 150k.

You should really consider the KISS theory before you end up either taking apart a perfectly good engine and screwing it up, or spending a lot of money on something you don't need.
01-21-2013 09:53 PM
moonlitdriver Also the noise comes from passenger side of the engine. Could the timing chain or tensioner be so worn/slack that its hitting something? (Had an old toyota that had that happen, but it had 295k miles on it!)
Hopefully picking up a truck soon to use as winter vehicle and daily driver to be able to work on possibly dropping the pan and having a look in there too.
01-21-2013 09:40 PM
moonlitdriver I did look into tumble flaps. Mine have some noise, but still unsure its the real cause of my problem. The car continues to run like total s*&! I did notice one of the plug boots was a little melted where it meets the coil. New boots on the way. also...here is a link to the odd noise under load. I still think it could be a bearing.
https://www.youtube.com/watch?v=wzSn...e_gdata_player
Any other suggestions?
01-18-2013 06:11 PM
whynotthinkwhynot Rod bearings aren't affected by bumps in the road.

The valve noise you are hearing is most likely not valve noise. Use a mechanic's stethoscope to listen to the valve cover, and it will most likely be quiet. Listen to the intake manifold, and you'll hear the noise. That's the tumble flaps. If you do this diagnostic, and find what I wrote, then start a thread asking about tumble flaps.

CV axles don't typically cause stuttering or stumbling like you referred to. Vibrations can be caused, but it's doubtful that those would be severe enough to seem like the engine is being affected.
01-17-2013 06:45 PM
moonlitdriver Don't know it makes a difference but took back road to work today...bumps in the road seem to increase the problem. Could this be related to a cv or drive shaft issue...or even a rod bearing?
01-16-2013 11:58 PM
moonlitdriver The boots seem fine. No cracks or anything. But I'll look into that on payday.
01-16-2013 10:33 PM
whynotthinkwhynot Change your coil boots. Those aren't designed to last more than 100k miles. I replaced mine at 80k. It had a "stutter".
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