1984 318i Help - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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#1 (permalink) Old 04-07-2005, 06:29 PM
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Hello everyone.

1st time poster here found this forum while looking around for info about older bmw's. I recently was given a 1984 318i . the car cosmetically looks to be in very good condition with 90k miles on it. Only thing is it has been in storage inside an airconditioned building for about 10+ years. I have made quite a bit of head way with bringing her back to life but have kinda hit a slight wall with a problem I am having and am loking for some advice. This is my 1st european car ever mainly have worked on american cars, Mazdas and Hondas.
I did all the common "bring the engine back to life thing" changed the plugs turned the engine over manually with new oil before cranking. etc etc as of now the engine itself fires and runs for about 15 seconds actually it came to life relativily easy. The engine itself runs and sounds very strong with no out of place noises whatsoever. I guess from here I will explain what the problem is and what I have checked so far. I am kinda at a loss for what to do from this point and really dont have the money for dealerships and paying 50 an hour for mechanics.

Problem description:
As previously mentioned the engine itself sounds and runs very strong with no out of place noises as far as we can tell. one thing the firing order was all out of wack, and upon 1st attempts to start up it backfired like crazy. We corrected the firing order and she now fires right up.
Upon firing the engine is raced to between 2k-3k rpm's which I have no control over. runs for about ten seconds or so before trying to come down into a more tame idle for an additional 5 or so seconds and then cuts off completely. at the point where the engine is racing around 2k-3k rpm I have throttle response from the pedal. in the last 5 or so seconds when it enters an idle it seems I have no throttle response at all and therefore cant feather it to keep it running. At this stage we belive the adjustment on the distributer should be relativly close enuff to keep it running. but unfortunatly cannot get it running long or correct enuff to to fine tune the timing.

what we've checked replaced:

We have gone thru all the vaccume lines and replaced everything in that department, done normal tune up procdures (spark plugs cap, wires etc.) fuel pressure seems to be ok . fuses and relays check out ok. timing chain seems to be in good condition. injectors inlcuding cold start injector seem to be functioning but only checked via stehoscope. airflow meter flap seems to functioning correctly aswell as the idle air stabilizer....

i think that about sums up what we've gotten to so far. currently I have only had an hour or so a day for the past couple weeks to get started on this and think I am making good progress so far. Just reaching out and seeing if anyone of you may have some ideas or suggestions . seemed like there were some very knowledgable people hanging around here.

thankyou in advance for your time.

Paul USA-Tampabay FL
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#2 (permalink) Old 04-08-2005, 11:31 AM
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what were your fuel pressures? i would hook up a guage inline and watch it when she starts acting all wonky.......i am thinking possibly bad fuel pump relay kicking in and out.....also possibly bad fuel pump......ALSO your fuel filter could have some crap in it that after a bit of sucking by the pump it cloggs it up.......and you aren't trying to start this thing on 10 year old gas are you?....

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#3 (permalink) Old 04-08-2005, 11:43 AM
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oooooooo, good point. Old fuel bad for cars. Fuel filter also a good idea. I bow down to Professors Knowledge.

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#4 (permalink) Old 04-08-2005, 05:10 PM
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lol no put all new gas in it and everything, today I was messin around with it and noticed fuel in the vacume line side of the fuel pressure regulator line... replaced it after a bit of cranking the air intake tube on the throttle body was leaking gas, removied the tube and got soaked with gasoline. it went all the way into the air cleaner... so mesa thinkin the diaphram in the fuel pressure regulator is all shot and the fuel isnt passing thru back to the tank and flooding the intake. May have been the problem all along witht he surge and then shut of of the engine as previously mentioned....

anyone have any other thoughts? or am i on the right track?
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#5 (permalink) Old 04-09-2005, 09:03 AM
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mesa thinkin you on right track...but mesa could be wrong

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#6 (permalink) Old 04-09-2005, 03:44 PM
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Captains log stardate uhhh april 9th 05, fuel pressure regulator installed along with new fuel filter... all problems still remain except for fuel in air tube, vehicle still wont run... The crew is loosing their minds cant hold out much longer.......

no seriously now im at a loss, unless my fuel pump is weak and am not getting steady pressure.....

captains personal log.... I'm gonna go in my corner and cry now....
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#7 (permalink) Old 04-09-2005, 05:56 PM
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Quote:
Originally posted by grail@Apr 9 2005, 01:44 PM
Captains log stardate uhhh april 9th 05, fuel pressure regulator installed along with new fuel filter... all problems still remain except for fuel in air tube, vehicle still wont run... The crew is loosing their minds cant hold out much longer.......

no seriously now im at a loss, unless my fuel pump is weak and am not getting steady pressure.....

captains personal log.... I'm gonna go in my corner and cry now....
[snapback]329120[/snapback]
what do you mean fuel in air tube?

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#8 (permalink) Old 04-10-2005, 12:02 AM
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k... the tube coming from the air cleaner box to the bottem of the throttlebody/intake manifold got flooded with gas 2 days ago trying to start, the engine fired and ran for 10-20 secs about 5 times then wouldnt fire anymore at which time i noticed wetness around the clamps when i pull the aircleaner side of the tube i got drenched with gas... at which time i checked the fuel pressure regulator and it had gas in the vacume line part of it.. replaced it today (saturday here) and no more gas flowing into the intake.... but the car still wont stay running runs for 10-20 seconds then just shuts off, minimal to zero throttle response at all, just surges immedialty to 2k or so rpm runs for a bit and shuts off..... gonna go thru testing the fuel pressure again sunday mornin cos I really dont know whats left besides the fuel pump or the TPS and I dont think a bad TPS would do that right it just wouldnt run at all wouldnt it?

Im really runnin out of ideas... Trying to avoid having to take it to someone cos that gets rather pricey quick.. All i've been able to find documentation wise on the car is a haynes manual and we all know how helpful those can be its a really sweet lookin car, cosmetically cherry.. even the enigne sounds quiet and strong when it comes on.. just cant keep it running.. its really getting rather discouraging.
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#9 (permalink) Old 04-10-2005, 03:14 AM
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Quote:
Originally posted by grail@Apr 9 2005, 11:02 PM
k... the tube coming from the air cleaner box to the bottem of the throttlebody/intake manifold got flooded with gas 2 days ago trying to start, the engine fired and ran for 10-20 secs about 5 times then wouldnt fire anymore at which time i noticed wetness around the clamps when i pull the aircleaner side of the tube i got drenched with gas... at which time i checked the fuel pressure regulator and it had gas in the vacume line part of it.. replaced it today (saturday here) and no more gas flowing into the intake.... but the car still wont stay running runs for 10-20 seconds then just shuts off, minimal to zero throttle response at all, just surges immedialty to 2k or so rpm runs for a bit and shuts off..... gonna go thru testing the fuel pressure again sunday mornin cos I really dont know whats left besides the fuel pump or the TPS and I dont think a bad TPS would do that right it just wouldnt run at all wouldnt it?

Im really runnin out of ideas... Trying to avoid having to take it to someone cos that gets rather pricey quick.. All i've been able to find documentation wise on the car is a haynes manual and we all know how helpful those can be its a really sweet lookin car, cosmetically cherry.. even the enigne sounds quiet and strong when it comes on.. just cant keep it running.. its really getting rather discouraging.
[snapback]329281[/snapback]
Have you checked that the fuel relay is functioning properly? My car usually gives a short buzz of the fuel pump (auto function of the relay) when turning the ignition on (to pressurise the system for startup) and then I start it.

Have you installed a new fuel filter?

There are also quite a few tech articles on www.BMWE30.net, that you can read up regarding your problem.
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#10 (permalink) Old 04-10-2005, 03:20 AM
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[quote=Daredevil,Apr 10 2005, 02:14 AM]
[quote=grail,Apr 9 2005, 11:02 PM]k... the tube coming from the air cleaner box to the bottem of the throttlebody/intake manifold got flooded with gas 2 days ago trying to start, the engine fired and ran for 10-20 secs about 5 times then wouldnt fire anymore at which time i noticed wetness around the clamps when i pull the aircleaner side of the tube i got drenched with gas... at which time i checked the fuel pressure regulator and it had gas in the vacume line part of it.. replaced it today (saturday here) and no more gas flowing into the intake.... but the car still wont stay running runs for 10-20 seconds then just shuts off, minimal to zero throttle* response at all, just surges immedialty to 2k or so rpm runs for a bit and shuts off..... gonna go thru testing the fuel pressure again sunday mornin cos I really dont know whats left besides the fuel pump or the TPS and I dont think a bad TPS would do that right it just wouldnt run at all wouldnt it?

Im really runnin out of ideas... Trying to avoid having to take it to someone cos that gets rather pricey quick.. All i've been able to find documentation wise on the car is a haynes manual and we all know how helpful those can be * its a really sweet lookin car, cosmetically cherry.. even the enigne sounds quiet and strong when it comes on.. just cant keep it running.. its really getting rather discouraging.
[snapback]329281[/snapback]

Also, have you checked the intake boot for leaks, if it leaks the car won't run.

A common problem with our cars which can exhibit the same symptoms is that the cold start sensor is messed up, giving faulty readings to the ECU causing the cold start injector to malfunction.
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#11 (permalink) Old 04-11-2005, 11:11 AM
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what do the plugs look like? if the FPR was bad, you could have been fouling out your plugs.......pull em' and have a looksee and clean them if needs be.......then go give it the italian tune up

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#12 (permalink) Old 04-13-2005, 02:06 AM
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I have the same problem on my 1985 318i. I Have been trying to figure out the problem for over 3 weeks now ghead . I have an adjustable fuel pressure regulator and can keep the engine running if I set the pressure on the regulator at 90psi but this is way to rich of a mixture. Could the injectors be pluged? Or, is it as simple as a bad reading from a sensor?
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#13 (permalink) Old 04-14-2005, 02:39 AM
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Has anyone figured out this problem yet??
Rich
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#14 (permalink) Old 04-14-2005, 10:17 AM
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I had this problem with my 325e. Now, I'm not as familliar with the sensory equipment on the 318i, but do you have a coolant sensor? This is going to cause the engine to rev up real good when it first starts up because the fuel injection system cannot get an accurate idea of the temperature of the engine, so it just dumps in fuel.

The reason it's stalling is beyond me though. Maybe too much fuel all at once when the engine is cold (because the sensor is fubar) is causing it to stall?

My car wouldn't stall, but it would run real rough. Assuming the 318i has a coolant temp sensor, thats what I'd try next.

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#15 (permalink) Old 04-14-2005, 10:33 AM
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uhm, nevermind. just re-read your thing about the fuses being okay. :P

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