Hit 2nd instead of 4th plez HELP!!! - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 08-09-2008, 02:39 AM
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Hit 2nd instead of 4th plez HELP!!!

hello i am new to this site, and have a few problems with my 1992 325is. About a week ago i opened her up on the freeway at about 1:30 am. i ran 3rd to about 6900 then accidently hit 2nd instead of 4th. no warning lights just a moderately loud ticking noise comming from the engine. i believe its comming from the valve train, and know ill probably have to be pulling the cover to fix it, just wondering what i should be looking for when i do.

I also bought the car with the srs light on was wonderin if anyone knows how to reset it without taking it to the stealership.

Thanks alot, T.J.
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#2 (permalink) Old 08-09-2008, 08:25 AM
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moderately loud ticking from the valvetrain? Sounds like you'll be doing a valve job cause you've most likely got a bent valve in there somewhere
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#3 (permalink) Old 08-09-2008, 08:52 AM
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Originally Posted by Ironwolf365 View Post
hello i am new to this site, and have a few problems with my 1992 325is. About a week ago i opened her up on the freeway at about 1:30 am. i ran 3rd to about 6900 then accidently hit 2nd instead of 4th. no warning lights just a moderately loud ticking noise comming from the engine. i believe its comming from the valve train, and know ill probably have to be pulling the cover to fix it, just wondering what i should be looking for when i do.

I also bought the car with the srs light on was wonderin if anyone knows how to reset it without taking it to the stealership.

Thanks alot, T.J.
any change in the quality of idle from before it started ticking?

ticking noise, does it increase with RPM? or is it a constant ticking irregardless of RPM?

high-pitched tick or low-pitched ticking? ...coming from the upper-end or lower end?

by comparison, would you say the ticking sounds like a diesel engine... or is the ticking just running in the background against the hum of the engine?

if u'll answer the above, i can diagnose your problem better
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#4 (permalink) Old 08-09-2008, 12:17 PM
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come to think of it i did notice a slight shudder in the idle every once and a while at a red light.

the noise does increase in correspondence to the rpm

it sounds medium pitched and is definately comming from the upper end

the ticking does not sound like a diesel, more of an addition to the regular running engine

thank you soo much for your help im more of a body work guy and dont know much about engine internals
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#5 (permalink) Old 08-09-2008, 12:57 PM
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moderately loud ticking from the valvetrain? Sounds like you'll be doing a valve job cause you've most likely got a bent valve in there somewhere
+1 this is almost a guarantee, i'd invest some money into some stiffer tranny mounts and start back handing 4th no matter what

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#6 (permalink) Old 08-09-2008, 01:18 PM
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+1 this is almost a guarantee, i'd invest some money into some stiffer tranny mounts and start back handing 4th no matter what
Forgive my ignorance Shahab but exactly what do you mean by backhanding?



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#7 (permalink) Old 08-09-2008, 01:44 PM
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Forgive my ignorance Shahab but exactly what do you mean by backhanding?
Manual transmissions default to spring loading toward the 3 - 4 (and 1 - 2) upshift. If you palm (back hand) on the front of the shifter, it will naturally click to 4th.

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#8 (permalink) Old 08-09-2008, 02:35 PM
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Manual transmissions default to spring loading toward the 3 - 4 (and 1 - 2) upshift. If you palm (back hand) on the front of the shifter, it will naturally click to 4th.
Aha.

This is what I always do. yay.



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#9 (permalink) Old 08-09-2008, 03:33 PM
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the noise does increase in correspondence to the rpm

it sounds medium pitched and is definately comming from the upper end

the ticking does not sound like a diesel, more of an addition to the regular running engine

<<< i am still not convinced it is a valve prob. even if you shift to 2nd gear at 6900rpm... the most that will happen will be to tax the wheels and diff. you can look at it this way- 6900rpm is 6900rpm whether u are in 2ndgear or 4th gear.

you can try this(just to convince you & me that the prob is indeed an internal engine prob). take out the belts and start the engine... let's see if u hear the same sounds you complain of.

then maybe... push in the clutch. hear any difference??

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#10 (permalink) Old 08-09-2008, 07:22 PM
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i am still not convinced it is a valve prob. even if you shift to 2nd gear at 6900rpm... the most that will happen will be to tax the wheels and diff. you can look at it this way- 6900rpm is 6900rpm whether u are in 2ndgear or 4th gear.
But when you go from 6900 in 3rd to 2nd gear, the engine will over-rev to 10,350. And THAT is plenty high enough to bend a valve.



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Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i


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#11 (permalink) Old 08-09-2008, 08:44 PM
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^^^ +1

Once you're off the clutch, the engine rpm's will try & match where the drivetrain is spinning at; and then you are way higher than 6,900 rpm's.
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#12 (permalink) Old 08-09-2008, 09:33 PM
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yup. bent valves. pretty common situation in e36's and manual rwd older cars with worn out tranny/engine mounts.

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#13 (permalink) Old 08-09-2008, 10:25 PM
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yup. bent valves. pretty common situation in e36's and manual rwd older cars with worn out tranny/engine mounts.
Ah, you're saying he missed the shift due to play in the mounts. Interesting.

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#14 (permalink) Old 08-10-2008, 12:00 AM
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your insights are well taken, but for the guy's sake i hope not

if you observe the way a car reacts to drastic downshifts, the generated torque is usually 'wasted" in a spinoff in the tires causing them to chirp. While i do not entirely discount the possibilty of bent valves from overrev; i would be more inclined to believe that the torque/energy generated from the sudden downshift will release in the wheels instead of back up on the engine...

but then again... if nukeduster's experience with E36 valves is accurate, then *goodness...
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#15 (permalink) Old 08-10-2008, 12:28 AM
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I do recognize that my mathematics assumes no energy lost due to that required to make the engine spin up, but even if the revs only go 1/3 the way between 6900 and 10300, that's enough to bend a valve.



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