Intake Cam Timing advanced 20 Degrees at IDLE

[GsxrMe]

Hey Kris, yes those bad boys are controlled via oil pressure. Is this always stuck at a static 20 or do you see it swing occasionally negative or even zero at times?

When I was testing some bigger injectors that were leaking a little, my cams we're going crazy trying to compensate for the extra fuel. I was freaking out like something is physically wrong with the motor during the tune but after installing the original full-blown Motorsports injectors the cams corrected themselves after a few miles on the road.

Again this was a terrifying experience. I'm so happy I tried the original injectors that I know that work perfectly fine do something completely unrelated.

[Kris86]

Originally Posted by GsxrMe

Hey Kris, yes those bad boys are controlled via oil pressure. Is this always stuck at a static 20 or do you see it swing occasionally negative or even zero at times?

When I was testing some bigger injectors that were leaking a little, my cams we're going crazy trying to compensate for the extra fuel. I was freaking out like something is physically wrong with the motor during the tune but after installing the original full-blown Motorsports injectors the cams corrected themselves after a few miles on the road.

Again this was a terrifying experience. I'm so happy I tried the original injectors that I know that work perfectly fine do something completely unrelated.

I see the cam timing jump up and down when I am applying throttle to ty and get it to idle, but always in the region of 20. Never as low as zero or near zero tho

We're u having a issue with all the cams acting up? Cause my situation is just one single cam

[GsxrMe]

Mine was passenger side only, and I thought I lost a rocker or something. Did you install anything new like bigger injectors?

After programming Ecutek with the original injectors and driving it around for about five miles in first gear in the neighborhoods the cam came back online. The car did not want to idle either and would stall. I never once got a check engine light or a code

I was also 3 hours from home thinking my car is fucked and may need to be towed.

[GsxrMe]

Never mind I see you purchased DW900cc in your build. Id really start with the old injectors and update your tune. Again It took a very nerve racking 5 miles to get it to come back online.

But yet again you may also be 1 tooth off.

[Kris86]

Originally Posted by GsxrMe

Never mind I see you purchased DW900cc in your build. Id really start with the old injectors and update your tune. Again It took a very nerve racking 5 miles to get it to come back online.

But yet again you may also be 1 tooth off.

Thank you very very much for this advice, I will definitely look into this

[Kris86]

Could it be possible that something went wrong with my Ecu?

[Ragin Gti]

It's most likely mechanical. I've had these that have faults for AVCS but they run fine. Fuji bond stuck in an oil passage, timing chain off, cam sprockets not on right etc.


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[Kris86]

Originally Posted by Ragin Gti

It's most likely mechanical. I've had these that have faults for AVCS but they run fine. Fuji bond stuck in an oil passage, timing chain off, cam sprockets not on right etc.


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I'm wondering if maybe some silicone is blocking the oil return passage and causing that particular sprocket to advance, not giving it a chance to relieve pressure

[Lantana frs]

Sounds like a tooth off to me.

[Scrappydoo]

Originally Posted by Lantana frs

Sounds like a tooth off to me.

Ditto

[Kris86]

Originally Posted by Lantana frs

Sounds like a tooth off to me.

When we back checked this, trying to adjust one tooth over in any direction, the cam sprockets timing marks would not be able to align

[Kris86]

I notice this image here in the service manual with the section with timing the left head.

I see a mention with the sub image at the top it's showing something with a 25degree adjustment, could this be related ? :-S I'm not a mechanic so I'm just looking explanations, shouldn't it be that once the timing marks are pointing to eachother then it's correct? Or is there some kind of 25degree adjustment to be made. ( my left head Intake cam is advanced around 20 degrees at idle but jumps around to as high as 25 I think I've seen)

[Lantana frs]

I've done a lot of belts and chains but not on these cars. I know that the first attempt at replacing my short block failed because of improper cam phasing. Poor mechanic was scratching his head.

[Ragin Gti]

With the front cover off and the crank in the proper position do the triangle arrows on the cam sprockets line up perfectly?


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