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Old 09-29-2007, 11:24 AM   #1
NateoriouS
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Question question about rpm's for e36..? please help?

hey guys,

quick question!!

i've got a 94 e36 325ic, and when i had my 95 e36 318i i had this same problem...!!

when i'm driving and coming to a stop.. if i don't down shift and just put my car in neutral letting the rpm's drop from about 3500 sometimes my rpms will dip below to around 0 and then above 1000 and start to "bob" up and down feels like an unsteady idle..

i'm sure this isn't normal, and i can avoid it by gearing down and breaking, or slowing down in gear and clutching in at around 1500 rpm. but if i just let it drop it sometimes starts to bob..

any idea what this is, anyone encounter this...?

i think i had the same problem on an 88 325i e30, 95 318i e36, and now my 94 325ic e36.... does anyone have an explanation???

Inspire me

thanks
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'88 E30 325i sold
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'95 E36 318i sold
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'96 E36 328i Cabriolet - sold
'92 Mazda Miata Black Nardi Edition sold
'98 E36 M3 Cabriolet -

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Old 09-29-2007, 11:57 AM   #2
Mystikal
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Sounds like a vaccuum leak to me. It's not "supposed" to do that, in any of those cars.

Jay
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Old 09-29-2007, 11:59 AM   #3
NateoriouS
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^^^ i figured that,

but, it only happens when i let the rpm's drop..!

weird!
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'88 E30 325i sold
'88 E30 325i 2.7 stroker sold
'95 E36 318i sold
'94 E36 325ic Cabriolet sold
'87 Mazda RX-7 Turbo II sold
'96 E36 328i Cabriolet - sold
'92 Mazda Miata Black Nardi Edition sold
'98 E36 M3 Cabriolet -

"Float like a Cadillac, Sting like a BEAMER" ... ... Lightning McQueen
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Old 09-29-2007, 12:02 PM   #4
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Yep. The ECU is compensating, keeping the engine running. If it's a slower RPM drop it can do this transparently, but when it's quick you'll notice it.

Jay
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Old 09-29-2007, 12:13 PM   #5
NateoriouS
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aaahhh..!! I see..

so possible vacuum leak?
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'88 E30 325i sold
'88 E30 325i 2.7 stroker sold
'95 E36 318i sold
'94 E36 325ic Cabriolet sold
'87 Mazda RX-7 Turbo II sold
'96 E36 328i Cabriolet - sold
'92 Mazda Miata Black Nardi Edition sold
'98 E36 M3 Cabriolet -

"Float like a Cadillac, Sting like a BEAMER" ... ... Lightning McQueen
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Old 09-29-2007, 12:16 PM   #6
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It's a likely culprit.

Jay
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Old 09-29-2007, 01:27 PM   #7
propr'one
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Bro, let your car idle with the hood up. Take the oil cap off. Does the idle change?

if not, you have a vaccum leak.
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Old 09-29-2007, 06:14 PM   #8
NateoriouS
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^^^ thanks...!! i'll do that..!


i suppose i do this when the car is cold??
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'88 E30 325i sold
'88 E30 325i 2.7 stroker sold
'95 E36 318i sold
'94 E36 325ic Cabriolet sold
'87 Mazda RX-7 Turbo II sold
'96 E36 328i Cabriolet - sold
'92 Mazda Miata Black Nardi Edition sold
'98 E36 M3 Cabriolet -

"Float like a Cadillac, Sting like a BEAMER" ... ... Lightning McQueen
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Old 09-29-2007, 09:51 PM   #9
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nate, i just found that culprit was my ICV hoses. check yours..
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Old 09-29-2007, 09:53 PM   #10
NateoriouS
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really?? thanks Ian..!

how'd you fix it?
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'88 E30 325i sold
'88 E30 325i 2.7 stroker sold
'95 E36 318i sold
'94 E36 325ic Cabriolet sold
'87 Mazda RX-7 Turbo II sold
'96 E36 328i Cabriolet - sold
'92 Mazda Miata Black Nardi Edition sold
'98 E36 M3 Cabriolet -

"Float like a Cadillac, Sting like a BEAMER" ... ... Lightning McQueen
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Old 10-01-2007, 01:20 AM   #11
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well, I just took em off, placed new ones that's been sitting here for a while...

if you're going to do this anytime soon, let me know if you need help, as im willing to.
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