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Wayne Woodward
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Wayne Woodward

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Wayne Woodward

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Wayne Woodward

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Hello Scotty,

First, thank you for this wonderful service you provide the world.  It is a blessing to have someone to ask complicated car questions.  My wife and I love your videos!

My problem vehicle is a 2007 Jeep Commander 4.7 SFI (Non Flex Fuel) w/120k mi.  I was getting some codes (P0300,P0204) that led me to replace the TPS, IAC, and EGR.  The TPS is a problem on this model engine.  I had an intake backfire occurring, so I replaced the aftermarket spark plugs with the manufacturer recommended plug (Alldata says manufacturer requires factory plugs due to the chance of pre-ignition).  I checked pressure at the fuel rail which was right at 60PSI.  I checked cylinder pressures, the highest at 185PSI, the lowest at 160PSI.  Alldata says these are in spec (<25%).  I drove it and it drove smooth.  I checked fuel trims.  At 1500 & 2500, LTFT is close to 0.  At idle, LTFT was showing 9.6 for bank 1, which seemed high.  A little less for bank 2.  I probably need to get some more warmups before those are more accurate?

At idle, I noticed 2 intake backfires in about 2 minutes of idling.  I did not test the injectors (I don't have a noid set), so I don't know if I have a lean condition causing an intake backfire.  No codes set yet.  I probably need to get that nifty probe you show on your test injector video.  Another mechanic stated that the heads were shot and a valve was intermittently sticking due to carbon, causing the backfire.  His recommendation was to do a head job for $4,500 or a new long block for $7,900.  I thought it would throw a more cylinder specific code if that was the case.  I was thinking I have some sort of pre-ignition/lean situation.  I have filled the tank and added a bottle of Techron cleaner, hoping that will clean the injectors.  I figured if the  '#4 injector was bad, it would rethrow the code. 

Just thinking while I am typing, I run straight 87 and the trouble typically happens when it is hot, like now.  I wonder if I have an octane problem and need to move up the grade during the summer, with the summer gasoline formula and all...

Would you have any troubleshooting recommendations?

As an aside, I am borrowing my friends Innova 3160b ODB II scanner.  Would you have a recommendation for a scanner for domestic vehicles, that can also command the PCM for testing, like raising idle rpm, etc, and has the ABS & SRS modules like the 3160b, but without spending a whole lot of money?

Thank you!
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Scotty Kilmer's profile photoWayne Woodward's profile photo
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Good Morning Scotty,

A quick follow on question regarding possible sticking valves due to carbon.  Could running a fuel system cleaner (or lacquer thinner) regularly (how regularly?), performing a pressurized injector cleaning on the rail with thinner (how often?), or running Seafoam in the oil to help clean off the carbon on the valve stems?  Any suggestions as to how to attempt to clean the stems short of pulling the heads?  

Thank you again,
Wayne

PS-Do you have a PayPal Donate button anywhere?  Your advice is invaluable!
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