Timing chain in 2007 SRX4
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Timing chain in 2007 SRX4 in Cadillac SRX Forums; I just had the timing chain replaced in my 2007 SRX4 with 23,000 miles. At the same time, they called ...
  1. #1
    mjnucci is offline Cadillac Owners Member
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    Timing chain in 2007 SRX4

    I just had the timing chain replaced in my 2007 SRX4 with 23,000 miles. At the same time, they called to tell me they were replacing the heads as well. Pickep up the car and the next day, 50 miles or so, the check engine light went on. As suggested by astute posters to this forum, I immediately called Onstar and had them run a diagnostic, i.e. document the problem. After holding for a few minutes, we were connected to a "diagnostic specialist" who suggested we schedule an appointment at the dealer tomorrow! As a matter of fact, Onstar called the dealer and with a three way conversation, booked an appointment pronto! They,ve had the car for two days and they called today to say that they were having problems properly aligning the chains and that "maybe someone from Cadillac regional was going to come to look at it in the next day or so". I live in Florida and when this first showed up, I was in Massachusetts where the dealer told me "No problem, drive it back to Florida and have it looked at". Then, when the Florida dealer discovered he was gong to have to wait a couple weeks to get the timing chain, they said"no problem, you can drive it until the chain comes in". Then, when the code pops up after the repair, Onstar says, "get that puppy in there tomorrow".
    I'll post the results of the latest chapter as it progresses but I would suggest that anyone with this problem go immediately to the first dealer they can find and tell Caddy, fix it or give me a new car! Can you say, "Lemon Law?" My wife and I both love the car but are ready to bail on the V6 with the AWD. I'm thinking of trying to negotiate, i.e. intimidate Cadillac into giving me a very good trade in to avoid any negative publicity.
    Mike

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  3. #2
    91sonomast's Avatar
    91sonomast is offline Cadillac Owners Fanatic
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    Re: Timing chain in 2007 SRX4

    Yes the timing chains are a problem, but I haven't heard of having problems, sounds like either the Technician hasn't done one before, or there is a problem with the heads, or tensioners.

  4. #3
    NewCaddyFan's Avatar
    NewCaddyFan is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    I think you have a much longer way to go before negotiation. Give the dealership/tech at least three times to straighten out the problem. Document every conversation and who you speak to just in case it really is a lemon. Be honest and "professional" yourself........."intimidate" will most likely hurt you than help you imho. My 2004 N* had lots of build quality issues (It was a 1st year model early in the build cycle...though not trying to make excuses.) With a little patience and a bunch of days in a loaner all the bugs appear to have been worked out and I really enjoy my car even after almost four years of ownership. Best regards....

  5. #4
    trapssrx is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    i too have had many many problems with my 07 srx v6 awd.....timing chain in oct...car was down 16 days. got car back 2 weeks later same problems again...reduced power couldnt go over 15 mph. oops..they didnt have things programed right in the tranny....bs....then i got a really bad oil smell, kinda smelled like driving through philly near the refinery....rear pinion seal was the blame this time.....week later smell is back, solution...go thorugh car wash....didnt fix...alled cadillac customer service they set me up with an emergency apt, power steering hose was leaking this time and they replaced both pinion seals as per recall...car down 10 days this time. called customer care again stating this is my 3rd caddy, and 14th gm between personal and business use includung a corvette , the girl said maybe they could work out a deal to purchase the remainder of my lease give her 2 days...she called back on a wed and said sorry cant help u out take the car back to dealer and have them go over car again..down again for 2 days...at this point i am down 34 days in under a year.. so i call 1800lemonlaw. as it sits now, my settlement is for 3800 bux but i gotta keep the car...if i dont accept offer i can sue,wait 12 months to see a judge in philly, then wait up to 6 months for a verdict....at that point i got 3 months left in my lease so to me its not worth it....this is the last caddy i buy, because they are treating me like i bought an aveo....another thing the girl from caddy said is that the dealer said i was beating on the car...the car got 8000 miles on it come on....and the dealer also told my attorney i was an ungrateful kid....i am 30 and own my own plumbing and heating business so i work for what i got.,.....mike

  6. #5
    trapssrx is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    i did fail to mention...there is also a hesitation when entering an on ramp, the ultraview leaks water and the 3rd row sometimes wont open..all of which were "condition not duplicated " by motorworld service in wilkes barre pa...the nav screen also goes blank for a day or so in cold weather even though the car is normally in a heated garage....go figure

  7. #6
    MortnCyn's Avatar
    MortnCyn is offline Cadillac Owners Enthusiast
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    Wink Re: Timing chain in 2007 SRX4

    Quote Originally Posted by trapssrx View Post
    i did fail to mention...there is also a hesitation when entering an on ramp, the ultraview leaks water and the 3rd row sometimes wont open..all of which were "condition not duplicated " by motorworld service in wilkes barre pa...the nav screen also goes blank for a day or so in cold weather even though the car is normally in a heated garage....go figure
    Just for grins and giggles, why not power the system down by disconnecting the battery. This should at least boot the NAV and who knows it might cure the hesitation. Doubt it will help any leaks though. Look at his post http://www.cadillacforums.com/forums...ad-reboot.html

  8. #7
    trapssrx is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    2 fridays ago my battery went dead so i replaced it under warranty cause it has died 4 times so the caddy dealer in scranton gave me a new one...still the screen went blank...all sound worked just couldnt change stations via the screen.

  9. #8
    mjnucci is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    I didn't mention that this was the fourth attempt at a fix. I don't have any problem with the dealer or Cadillac as they seem to be trying to fix the problem. However, I'm beginning to think it's a design flaw. They've replaced the heads in this last go around and that makes me suspect there are some design corrections. I jokingly told the service manager when I first brought it in to " order a crate motor, just in case".
    I'm supposed to get the car back tomorrow. I'll let you know!

  10. #9
    mjnucci is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    Got the SRX back and an explanation that there was a bad tooth(gear) on the timing chain sprocket. On the way home, passed a couple of cars, flogging it pretty well. Performed great. Hopefully, it's fixed. As a "thank you for being patient" (they had the car for 8 days) they did a complete detail. Really nice work. I'm pleased for now!

  11. #10
    caddycruiser's Avatar
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    Re: Timing chain in 2007 SRX4

    Well, that's a good sign!

    Now hopefully that, and maybe the other issues, will all be resolved soon...and not cause you anymore grief.

  12. #11
    robhersch is offline Cadillac Owners Enthusiast
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    Re: Timing chain in 2007 SRX4

    Quote Originally Posted by mjnucci View Post
    Got the SRX back and an explanation that there was a bad tooth(gear) on the timing chain sprocket. On the way home, passed a couple of cars, flogging it pretty well. Performed great. Hopefully, it's fixed. As a "thank you for being patient" (they had the car for 8 days) they did a complete detail. Really nice work. I'm pleased for now!
    Glad to hear that your problem(s) are corrected! Also glad to hear something good about GM/Cad service; most of these problems identified herein do not seem to end up as satisfactory as yours, or maybe we don't get the final word.
    Was the real problem related to just a bad tooth on a timing sprocket? And were the heads replaced? Did they need to be replaced as a result of improper valve timing? If so, was it necessary or done to ensure a proper repair??
    Thanks for the information, and good luck with your SRX!!

  13. #12
    trapssrx is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    is it normal to replace the ehads after a timing chain went bad? since mine were not replaced, could that be affecting my mpg? i am averaging 11.8 on highway,

  14. #13
    akdj1055 is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    I don't think it's normal to replace the heads. Mine weren't replaced when my timing chain was replaced last summer.

    My question is, why are there still so many problems with these timing chains? I can somewhat understand there being a problem early in a production run (like on my early '05), but shouldn't some of these major problems be engineered out by now? I'd be extremely upset, as an '07 owner, to be seeing the same problems that GM has known about for years now.

  15. #14
    The Wrench is offline Cadillac Owners Enthusiast
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    Re: Timing chain in 2007 SRX4

    Hmm, this has gotten my mechanical juices flowing.

    To examine the chain issue from a mechanical standpoint (just my thoughts, I have zero practical experience with this particular engine):
    - I read herein that GM admitted to a run of "improperly spec'd" chains sometime in the '07 build. The problem eventually manifested itself as a "loose" chain that the tensioner could not correct.
    This would seemingly mean that the chain was:
    - improperly hardened, and wore (stretched).
    - manufactured with wrong dimensions: link pitch or width (seems unlikely), or maybe one-too-many links? (I like that last one, a true "Murphy's Law").

    Whatever, the results would all be similar, chain gets too long for the tensioner to compensate for, and bad things begin to happen.
    1. Chain loosens to the point that it begins to flop and oscillate, and the crank position sensor and cam position sensor don't correlate. Check engine light comes on. Sprockets, tensioner, guides, and even cam bearings see unusual forces and wear.
    2. Chain oscillates so badly it strikes castings on the head and block, and chews them up, diffusing metal particles into the engine.
    3. Chain actually jumps a tooth. In my experience, the engine will still run, but pretty badly, and should set a host of codes and lights. Of course the sprockets are disfigured, and all associated bearings are highly stressed.
    On this motor, I don't know if a valve might actually strike a piston under this condition.
    4. Chain breaks - Hasta la Vista, baby.

    So, to postulate further, it seems that phase 1 is the most commen extent of the failure, as the check-engine light gets the owner's attention.
    - by this time, the chain has been oscillating pretty wildly between the sprockets, and probably caused some trauma on the tensioner, sprockets, guides, and maybe the cam bearings. it may also have diffused some metal wear shavings into the oil supply. If the car is still driven, it can only get worse for all these components, it would seem.

    So, we bring the car in for the fix.
    - If the dealer replaces only the chain, all may be fine forever.
    Or, the other components (sprockets, bearings, guides, tensioner) might be subject to later (or sooner) failure.
    - I "assume", they always replace all the sprockets, guides and the tensioner on principal (am I assuming too much).
    - Maybe, in the above post, they replaced the heads due to cam bearing damage, or grinding damage on the casting from the chain (ouch).
    Maybe it jumped a tooth and nicked a valve on a piston (double ouch).

    So, it would seem to me, If you own an '07 V6, you might do the following, depending on your level of anal-retentiveness:
    1. Always check your oil filter for any signs of metal residue (use a magnet).
    It's really easy, since the filter is the open cartridge type.
    2. Listen to your engine; if you hear anything unusual, especially when cold, take it in and get it checked for chain issues. Dealers have the easy ability to check for "stretch" and proper cam timing.
    3, If you get any symptoms or a light, take it in an get it fixed right now, regardless if they tell you it's fine to drive for awhile.
    4. Ask what they replaced and why. Question it if they only replace the chain.

    Sorry to be so apocalyptic, but bad chains can be serious stuff.

    DG

  16. #15
    donhenry@aeiwireless is offline Cadillac Owners Member
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    Re: Timing chain in 2007 SRX4

    TSB J0820. We had our 07 SRX V6 AWD (12000 m) at dealer for 6 weeks last fall to get the defective timing chains replaced. The new chains were not available as several cars were getting repaired nationwide. Our paper work shows that TSB J0820 was accomplished which included installing (2) 12589011 chains, (2) 12616608 chains and (1) 12616609 chain. Car runs good after replacement. Servicing Dealer Frank Kent provided 08 DTS for us for the 6 weeks and GM provided other monetary considerations
    We were told that some chains in early 2007 models were not heat-treated by vendor. GM had several redesigns. The chains stretch and car runs dangerously slow as timing is changing. My dealer had good mechanics who knew what and how to fix - engine was stripped down. We have had no oil leaks or other issues.

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