3.6 Running Rough
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V6: 3.0, 3.2 LA3, 3.6 LY7, 3.6 DI LLT Discussion, 3.6 Running Rough in Cadillac Engine Technical Discussion; Need your guys help. I'll give you a background so that you guys have the whole picture. About 6 months ...
  1. #1
    juanssilva is offline Cadillac Owners Member
    Join Date
    Apr 2014
    Posts
    2

    3.6 Running Rough

    Need your guys help. I'll give you a background so that you guys have the whole picture. About 6 months ago my 2007 Cadi CTS flagged a P0017 - Crank/Cam correlation code. No driveability issues just a solid light. I swapped crank sensors but didnt fix the light. Code still present. 3 weeks ago the car started making a loud tap/knock at bank 1 and then the following codes popped up. P300 - Random mis, P301 - Cyl 1, P303 - Cyl 3, P305 - Cyl 5 and then these two code P0016 - Crank/Cam correlation Bank 1 Sensor A & P0018 - Crank/Cam correlation Bank 1 Sensor B. Since the car had a loud knock I knew the issue was mechanical. I tore down the front cover and found secondary chain tensioner on bank 1 took a shit. I replaced all tensioners, guides and chains. With the help of AllData I was very careful I followed the steps and put it all in timing. Put the car all back together and fired it up. At first it had a no/hard start but eventually fired up. However it idles very rough and now I have the following codes. P300 - Random mis, P301 - Cyl 1, P303 - Cyl 3 and P101 - MAF. I swapped coils around hoping the mis would jump so that I can identify the bad coils but no luck. Same two cylinders are misfiring. I also wanted to see if the car would bog down if I through into drive. I lowered the car back onto the floor and took it for a spin around the block misfire and all. Got back home and now I have the following codes. P700 - Trans Control Module, P300 - Random mis, P301 - Cyl 1, P303 - Cyl 3, P302 - Cyl 2, P304 - Cyl 4 and now P0073 - Ambient air temp. However there aren't any crank/cam correlation codes and the MAF code is also gone. Due to no correlation codes I dont think my timing is off but I could be wrong. The trans code is strange but I didnt experience any shifting problems on my road test. As for the misfires why are only the 4 front cylinders affected and not the rear 2. I really need your guys help.

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  3. #2
    DaddysCaddy13 is offline Cadillac Owners Member
    Automobile(s): cts
    Join Date
    Oct 2013
    Age
    40
    Posts
    43

    Re: 3.6 Running Rough

    I'm having a similar problem only I changed my plugs and two weeks later my check engine light comes on?? scanned it put no codes are coming up and it shakes (engine) to boot, so I'm going nuts trying to figure out what's going on with this car??

    Sent from AutoGuide.com Free App

  4. #3
    EBSuspension is offline Cadillac Owners Member
    Automobile(s): 2005 CTS
    Join Date
    May 2013
    Age
    34
    Posts
    3
    Quote Originally Posted by DaddysCaddy13
    I'm having a similar problem only I changed my plugs and two weeks later my check engine light comes on?? scanned it put no codes are coming up and it shakes (engine) to boot, so I'm going nuts trying to figure out what's going on with this car?? Sent from AutoGuide.com Free App
    The cure for mine was new timing chains and tensioners. The tensioners get carboned up and weak and the the lower chain gets stretched throwing it out of time.

  5. #4
    Theduck is offline Cadillac Owners Member
    Automobile(s): 2007 sts
    Join Date
    Feb 2014
    Age
    62
    Posts
    3

    Re: 3.6 Running Rough

    Check compression on cylinders.

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