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General E46 Forum
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Old 08-18-2013, 07:08 AM   #41
dmax
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You seem to have more than one thing going on. First, this mechanic with 30 years' experience might have told you about the risk of poly mounts anywhere causing you to feel more. Second, as mentioned, having poly trans. mounts and original rubber motor mounts...you've changed things considerably. You have hard in the rear of engine and soft in the front. I am of the opinion based on lots of reading here that bmw got it right when it put the mounts it did on the car. You thought poly was better, last longer, whatever, and now, given all the poly you have, I hope you also got firmer motor mounts. If you got OE mounts, I suspect you'll still have an issue given the difference in stability between the front and rear of engine.

I don't have the codes memorized, but given that the opinion seems to be vac leak, that's very possible...whether coincidental to all the work you had done or not, I don't know.

If the codes are lean, then vac leak, clogged FF/failing FP, I don't know. Your mechanic should have felt what you felt and it sounds like he's doing what I'd expect most mechanics would do...say it's not anything he did/didn't do and hope you get used to it...but usually it's 'find another part to replace.'

Anyway, on the motor mounts, I think you need to have them as firm as your tranny mounts. Also, I do hope with his 30 years' experience, he mounted the Universal Joint properly (guibo)...one bolt off and he's off by a mile.

Have you been underneath the car to look at things? Maybe shoot some pics of the suspects like guibo and see what we see.

GL, OP...know this is frustrating!
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Old 08-18-2013, 09:06 AM   #42
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Re: mechanic vs forum the CHALLENGE

When the fuel pump fails, OP , it usually just fails, yeah you may see a difference after its changed in performance, but it's usually not going to be noticeable before it fails in there form of shaking unless you are a rarer case than everyone

I can tell you the day of failure, when it was struggling to stay started, it would start shaking bad then the revs would start shaking up and down like a earthquake then I would slow my press gas to floor and it would ever so slightly increase but bog like crazy then just die

Dmax and jfoj are smart and have experience

If it was my car I'd change fuel pump/filter, fuel pressure reg vacume hose, both intake boots, re-seal DISA, do OFHG, valve cover gasket/Vanos

Ofhg and vc/vanos being unlikely to cause issue.. but will be if it you greatly and show you engine condition

Sap hose going to back of engine (at this point you should just look at jfoj's Sig and do it all)

Knock out diff/trans pan drop / filter fluid change because it could only help

Buy some ramps and visually look for problems too

Then, to save money and rule things out, sell old poly mounts and install all new OEM rubber mounting for motor/ trans...considering you will keep the car and its worth saving

Make sure the trans isn't on its way out before the mount part or else you mindfully would be stupid as a swap with a used low mileage box would yield removing mounts anyways

It's was 100$ something bucks

BMA parts is cheapest/ best site using spec30 code

Don't quote me on code accuracy, read jfoj thread

BTW, as t 152k, my OE motor mounts don't vibrate as you describe but your Frankinish combo of mount type may?

No clue good luck

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Old 08-18-2013, 09:11 AM   #43
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Re: mechanic vs forum the CHALLENGE

Belts/pullys too. Made my engine really smooth

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Old 08-23-2013, 05:03 PM   #44
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So,

who won?
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Old 08-26-2013, 12:33 AM   #45
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Quote:
Originally Posted by dmax View Post
You seem to have more than one thing going on. First, this mechanic with 30 years' experience might have told you about the risk of poly mounts anywhere causing you to feel more. Second, as mentioned, having poly trans. mounts and original rubber motor mounts...you've changed things considerably. You have hard in the rear of engine and soft in the front. I am of the opinion based on lots of reading here that bmw got it right when it put the mounts it did on the car. You thought poly was better, last longer, whatever, and now, given all the poly you have, I hope you also got firmer motor mounts. If you got OE mounts, I suspect you'll still have an issue given the difference in stability between the front and rear of engine.

I don't have the codes memorized, but given that the opinion seems to be vac leak, that's very possible...whether coincidental to all the work you had done or not, I don't know.

If the codes are lean, then vac leak, clogged FF/failing FP, I don't know. Your mechanic should have felt what you felt and it sounds like he's doing what I'd expect most mechanics would do...say it's not anything he did/didn't do and hope you get used to it...but usually it's 'find another part to replace.'

Anyway, on the motor mounts, I think you need to have them as firm as your tranny mounts. Also, I do hope with his 30 years' experience, he mounted the Universal Joint properly (guibo)...one bolt off and he's off by a mile.

Have you been underneath the car to look at things? Maybe shoot some pics of the suspects like guibo and see what we see.

GL, OP...know this is frustrating!



UPDATE: SO i replaced the pump, and received the polys for the engine. also went ahead a bought new drive belts and pullys so all will be replaced.


i did the fuel pump my self (30 min job NBD) so i could get the car up and running. and wow what a difference. the first time i turned the car on it ran like ****, no power, slow acceleration, to say the least i was freaked out. so i said f*** it tomorrow is another day. fast forward to the next day. i had to drive to work so i allowed my self extra time incase i had to get towed back or something went wrong.

well to my surprise it ran like new again!!!!! let me clarify, there is still a massive vibration through out the rev band. but idle is smoother, and the slight lack of acceleration that i spoke about in the first post is now gone. the car also starts much better (I use to have to prime it once or twice.)

so now i have the motor mounts and i ordered the last pulley which should arrive tomorrow then on Wednesday i shall have my mechanic install all these parts.

back to the fuel pump. i cleared all my codes after putting the fuel pump and i have yet to have any of the codes i state previously (p4091,P4092, and P430) come back. did this solve those issues ? i was convinced that P4091 and P0492 were not related to this issue.
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Old 08-26-2013, 12:41 AM   #46
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well wednesday the challenge will finally have a winner. stay tuned.
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Old 09-05-2013, 01:33 PM   #47
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UPDATE: so i had the mounts and pullys put in yesterday and wow what a difference, i still feel vibration but it is 50 percent less and only when i am stationary once the clutch is engaged it feels smooth and like a new BMW!!!! very happy with the step up, not bad harsh at all. anyone considering polys all the way around i would go ahead and do it, i am very happy!
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