Have you seen camshaft adaptation "positive" +

[RPMtech147]

Have one with a 4096 (Cam/crank correlation) but this number is always negative when it's chain time.. I've never seen one go positive. Am I missing something? I suspect someone installed a timing set off 1 tooth.





The other 4 faults are misfires

[Smac770]

Yeah, off a tooth maybe. I forget what was worked out some really long time ago, likely buried in that timing chain thread. Maybe 15° per tooth?

[RPMtech147]

Yeah, off a tooth maybe. I forget what was worked out some really long time ago, likely buried in that timing chain thread. Maybe 15° per tooth?

I'll tear it down in the morning, at least the timing covers. I'm sure I'll find something strange.

[silver_tt]

7.82 degrees per tooth (360 / 46 teeth)

I would pay close attention to the reverse threaded VVT solenoid or the phaser itself (lock pin spring possibly came off etc)

[RPMtech147]

7.82 degrees per tooth (360 / 46 teeth)

I would pay close attention to the reverse threaded VVT solenoid or the phaser itself (lock pin spring possibly came off etc)

I just remembered I saw this a while back on a CC. Needs a cam. Timing was gtg.

[silver_tt]

ya exactly, unfortunately would need a whole new cam $$$

[mrg_B8TFSi]

Yeah I agree I’ve never seen an advanced cam/crank correlation.. it’s typically retarded (negative value) that would see to be VVT valve or the magnetic solenoid? Or the top chain guide is broken/missing, I’ve seen that before causing a positive value.. it does sound like a tooth has jumped.. you should park it and open up the upper case and look, not sure if you’re ready for the entire timing upgrade yet but first you should verify the intake phazer and pull the cam bridge set it to TDC and take measurements..


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[mtroxel]

Have one with a 4096 (Cam/crank correlation) but this number is always negative when it's chain time.. I've never seen one go positive.

Sounds like you know where you're headed now. But mine is positive...or at least it was when I did my timing chain about 90,000 miles ago. Not nearly as positive as that one. You would think I did something wrong, but that was 90K miles ago with no problems. I looked at the cam adaptation just a few weeks ago. Can't remember the number but it was negative now, but no where near the - 7˚ to -8˚ you would expect with a 90K mile chain. But it stayed positive for at least 20-30K miles.

[Theiceman]

This is a situation where the " interview" is extremely valuable...
did the customer do any previous work? history of the car ? did it come from another shop ? when did the reported problem start ? etc.

If it just a regular dude driving his car and never had chain work done, and all of a sudden came up, its unlikely that it is off a tooth or anything like that.

if its advancing on its own as stated it could be the 4/3 valve in the end of the cam stuck open , but usually when you see that the end pops out, is very obvious and it goes 20 -30 degree.. that look more like the retard locking pin is not engaging in the cam phaser. Could be the pin in the N205 solenoid jambing too i guess.

This is a good one and look forward to hearing what you find.

[RPMtech147]

This cam is now a maraca. Sounds a little reggaeton



Just for fun

[silver_tt]

you removed the post (which I thought was hilarious btw), does that mean it wasn't the maraca camshaft? :)

[mtroxel]

you removed the post (which I thought was hilarious btw), does that mean it wasn't the maraca camshaft? :)

I'm ashamed to admit, I watched his Maraca video all the way through...

..twice

[silver_tt]

same. Bring back the maracas!!! RPM this is your thread and you can post maracas videos if you want god damn it, no one can tell you to stay on topic :)

[RPMtech147]

you removed the post (which I thought was hilarious btw), does that mean it wasn't the maraca camshaft? :)

It was the cam, I goofed up the edit....will fix later; back at work.

[Theiceman]

It was the cam, I goofed up the edit....will fix later; back at work.

locking pin in phaser " f'ed up ?

damn now i feel i missed out .. lol

[RPMtech147]

locking pin in phaser " f'ed up ?

damn now i feel i missed out .. lol

The pin hole was hogged out, thats why so much jiggle, but every part of the phaser was just worn, scoring, the veins cut little cups in the corner of the housing, etc. Runs like a top now.

also fixed the maraca video = )

[Theiceman]

The pin hole was hogged out, thats why so much jiggle, but the every part of the phaser was just worn, scoring, the veins cut little cups in the corner of the housing, etc. Runs like a top now.

also fixed the maraca video = )

thought it might be that ... ok ill admit it , i clicked the maraca video first

well thats the second cam i think you have done in as many months ... tells me something is coming for all of us .

how much for a cam these days ?

yeah after watching your far less entertaining vid, i would say that's about 8 degrees of Maraca :)

[silver_tt]

Bout $800 for a OE cam... there's a decent possibility that person had an oil pressure issue or used the wrong viscosity oil at some point

[Theiceman]

Hey Maraca man i have a question related to another thread ....

cam replacement. whole front end has to come forward and essentially redo the timing job right ? so essentially a timing job with a new cam ?

did you find any short cuts with the ones you did to avoid this ?

i personally think the inspection port is more than that ... it is somehow used to compress the tensioner and hold it in place for cam servicing without pulling all the other gear. .

thoughts ?

[RPMtech147]

Hey Maraca man i have a question related to another thread ....

cam replacement. whole front end has to come forward and essentially redo the timing job right ? so essentially a timing job with a new cam ?

did you find any short cuts with the ones you did to avoid this ?

i personally think the inspection port is more than that ... it is somehow used to compress the tensioner and hold it in place for cam servicing without pulling all the other gear. .

thoughts ?

It's basically a timing job minus the balance shaft chain. I made a tool to try and push back the tensioner like in the service manual (Its a little plate you bolt to the head to make a fulcrum so you can use a prybar) but after multiple attempts to do it that way, it was just a waste of time. There isn't enough room to stick your head, a pair of tiny pliers and flashlight to grab the locking ring on the tensioner while prying, I tried. Maybe if you completely removed the front end it would be possible.

Just Pull the lower cover and take the chains off and re-time. I just do a normal service position, let the core support hang from two long ass bolts.

[Theiceman]

yeah thought so
guy on a another thread wants to replace a lifter at the front of the engine ..

so in for a penny.... in for a pound i guess


thanks ...