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Shakey Cold Start

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OllieVRS:
This is my old cam follower with 10,000 miles on it. Replaced it at the time (5000 miles ago).





And this is my cam. A bit scary looking but was running completely fine.

pudding:
That cam has had it. The peaks are worn down and is why your follower looks like that after 10K. It's not critical at the moment but I would look into getting a new cam.

Is it an AXX engine? They're known for having chocolate intake cams.

OllieVRS:

--- Quote from: pudding on November 24, 2023, 10:06:53 pm ---That cam has had it. The peaks are worn down and is why your follower looks like that after 10K. It's not critical at the moment but I would look into getting a new cam.

Is it an AXX engine? They're known for having chocolate intake cams.

--- End quote ---

Feared you'd say that. It's an BWA with 132k miles, but shoddy service history as well as a history of low oil pressure. If the cam goes then I might as well start looking at a full rebuild or replacement as the rest of the engine is pretty worn from previous owners neglect.

Does it explain the weirdness that it's only flooring it at mid RPMS in a high gear? Doing a normal 'pull' with high RPMs in each gear is no problem whatsoever, she's still running sweet.

On a side note, friend said if I give him a grand discount on the car when I sell it to him or a year or so he'll promise to rebuild the engine  :grin: so she needs to survive till then.

pudding:
I usually am the bearer of bad news aren't I?  I do try to be positive as no one wants a big bill, but in this case the cam is unhappy I'm afraid! Take him out and buy him a drink to cheer him up, poor thing, he's had a hard life!

Yeah if it's holding back with heavy throttle inputs in the mid rpms, it's lean. That's when the engine demands the most fuel. You only need to wear the cam down 0.5mm to start screwing with the fuelling. With all that wear on the follower and cam, it could be as much as 1mm short in pump lift. I think the pump lift is only about 5mm or so with a healthy cam, so it's a pretty tight margin.

Neglect definitely doesn't help unfortunately!

You could pop a used S3 intake cam in there in the meantime which has a touch more pump lift than the GTI/ED30 cam.

OllieVRS:
Yep, looks like I'll be going back to my factory map then at least until winter ends.

Have missed being able to do 40mpg  :grin:

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