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Old 01-30-2013, 03:51 PM   #1
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Join Date: Apr 2012
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Location: Battle Creek, MI
What I Drive: 2004 Twilight Blue ZTS, 2.3L PZEV

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[SOLVED] Help me diagnose this engine problem?

2004 ZTS Sedan, 2.3L PZEV, auto-trans

A couple weeks ago I did the Stealth CAI mod based on BlazingCopper's writeup here:

It has been great!

However just today I fired up the car and it was sputtering & puttering - and the Check Engine light started BLINKING. I had not left the driveway, so I pulled it into the garage, shut it off, and looked up the blinking. A misfire condition... great. :(

I checked when I last changed the spark plugs - over 40k miles ago. I had a box of Autolite XP103s on hand, so I checked the gaps at .050~.055-ish, disconnected my battery, and installed the new plugs.

I reconnected the battery, fired it up - no Check Engine light at all - not solid, not blinking. I let it idle for a few minutes, then drove it to my nearest Advance Autoparts. It still had the sputter during the drive, but no Check Engine light, there & back round trip about 8 miles.

The guy at Advance plugged into my diagnostic port - no static codes (I had cleared them evidently when I disconnected the battery) and the live data all checked OK with the car sitting, at idle and held at 3k rpm for a minute or so.

He asked me to pop the hood with it running, and he stated it sounded like something was sucking air where it shouldn't - a vacuum line, intake manifold, etc. I noticed the hissing too - it seems to be coming from the passenger side of the engine compartment, so I guess it's not the sound of air moving thru the new Stealth CAI setup.

I took these three videos when I returned home, idling in my driveway.

Inside the car watching the tach:

At the tailpipe - oh yah sputtering!

Hood up, engine compartment:

Any ideas on what I should do next?



Last edited by JakeTheSnake; 02-02-2013 at 01:44 PM. Reason: Changed title to indicate problem solved
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