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FAQ / REFERENCE => How-To's => Topic started by: firehawk318is on April 25, 2010, 07:54:04 AM

Title: e30 m42 problem
Post by: firehawk318is on April 25, 2010, 07:54:04 AM

hi

I have a problem
My engine runs cold 750 rpm idle and 1000 rpm when it is hot.
and if he is cold he misses power and when he turns warmer it better

maybe someone knows what the problem might be.
engine runs smoothly

grt Hilbert harm

Title: e30 m42 problem
Post by: PumpItUp on April 25, 2010, 06:18:58 PM

tell him you're going to the zoo but instead blindside him with a vasectomy. :confused:

http://m42club.com/forums/showthread.php?t=2742
http://m42club.com/forums/showthread.php?t=3621

Title: e30 m42 problem
Post by: firehawk318is on April 26, 2010, 11:06:49 AM

i replaced all the hoses and i cleaned everything.
and i have this throttle house
(http://static.bmwfans.info/images/epc/MTk1N19w.png)
could number 7 be the trouble or can it be something else

Title: e30 m42 problem
Post by: Jorgeconrico on April 26, 2010, 03:02:58 PM

You said you cleaned everything....What about your ICV??

Title: e30 m42 problem
Post by: firehawk318is on April 27, 2010, 03:32:47 PM

i cleaned that to

Title: e30 m42 problem
Post by: BlueBMW on April 27, 2010, 04:01:59 PM

My car idles lower when its cold and then usually a little higher when its hot.  As far as I'm concerned, it seems normal. :D

Title: e30 m42 problem
Post by: PumpItUp on April 28, 2010, 05:46:59 AM

since your car works fine, but just has some small kinks, before you bother tearing stuff apart & buying new parts.. why not do the easy thing and get

-seafoam
and afterwards
-lubro moly fuel injector cleaner
that's like $17 total and doesn't require any labor

bad idle = good chance its dirty injectors
but that doesn't explain change under weather
clogged cat? (which works better when warm). seafoam cleans your cat
ofcourse you probably dont have a cat in the netherlands but it helps with throttle response

also low battery = bad idle. and cold is bad for batteries. sometimes in neutral you have to keep it up with accelerator or it will stall.

you're probably not some idiot with a bad battery but seriously if you make a lot of short trips, it will get low on juice and give you shit idle

theres always coil on plug kit! http://m42club.com/forums/showthread.php?t=9122&highlight=coil+on+plug coil on plug solves everything :confused:

Title: e30 m42 problem
Post by: firehawk318is on May 03, 2010, 11:52:24 AM

thanks for the tip.
my battery is oke and my alternator is good to so i will try other injectors.
my brother still has some m5 3.6 injectors will it be a good idea to try them or is it a bad idea.

Title: e30 m42 problem
Post by: PumpItUp on May 08, 2010, 04:04:51 PM

http://m42club.com/forums/showthread.php?t=233&highlight=injectors

mustang in america, some vaxuall in europe
or just buy brand new from bosch. i think those are the options.
everyone says how awesome 4 pintle injectors are but i have yet to try them.
just read that thread, its only 10 pages

Title: e30 m42 problem
Post by: firehawk318is on June 01, 2010, 02:38:49 PM

i replaced the injectors with ones from a s38.
it drives a little bit smoother but i did not solve the problem but when i replaced the injectors i have noticed that the injectors where going in the inlet manifold to easy and it make a sound if it  is leaking by the injectors in the manifold so i will go and get new seals and hope the problem will be solved.

i made a movie of the motor running
http://www.youtube.com/watch?v=5TSzTQyB2OI (http://www.youtube.com/watch?v=5TSzTQyB2OI)