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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 04-28-2013, 10:04 PM
scharf1 scharf1 is offline
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Idle has gotten worse

so i put new plugs, wires, cap and rotor on. (old plugs where covered in black carbon, don't know how they where firing in the first place) well it has gotten much worse. I have noticed it gets worse when it gets to normal opp temp. since i have gotten the car i haven't drivin it due to this issue. I was trying to time it so i let it idle for about 10m to get it warmed up. once it was warmed and i tried to give it any throttle after words it just died. it wouldn't rev at all. once its cold it will rev up but have to feather the throttle a bit to get it past 3k rpm. I am going to text TPS, clean MAS and going to replace FPR. anyone input would be great.
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  #2  
Old 04-29-2013, 12:22 PM
Wolfy Wolfy is offline
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How about the oxygen sensor?
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  #3  
Old 04-29-2013, 02:02 PM
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Newman271 Newman271 is offline
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Compression test? Im almost leaning to a headgasket going out.
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  #4  
Old 04-29-2013, 06:54 PM
scharf1 scharf1 is offline
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ill have to do a compression test. i haven't checked o2 sensor yet it could be bad. mas is VERY dirty with a VERY dirty air filter.
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  #5  
Old 04-30-2013, 03:43 AM
Wolfy Wolfy is offline
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Replace the air filter, as well as the temperature sensor
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  #6  
Old 04-30-2013, 08:29 PM
scharf1 scharf1 is offline
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I'm starting to think it's electrical. When I started the car it was running on only 3 cylinders ( which has just started doing ) and when I got out I felt an electrical tick when I grounds myself to the body. Which means my motor and or my coil isn't grounded properly. Which can explain the rough almost non existent idle. I had just replaced my plugs, wires, cap, rotor, cleaned mas, cleans the terminals to mas, tested tps and cleaned it, also cleaned intake manifold. The bummer at this point won't even rev anymore. It will idle on 3 cylinders. Once you give it any throttle it will just die. Tomorrow I am going to pull the plugs and see what cylinder isn't firing. Also try to do a compression test on all cylinders.
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Old 04-30-2013, 08:34 PM
scharf1 scharf1 is offline
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One more thing.the motor seems to warm up fast. Which it's 80 degrees out so I would imagine it would warm up fast. But the gauge says cold but the more is pretty warm to the touch. Oil is clean and violent is clean. I don't think it's a blown head gasket. Nor is there smoke out the tail pipe. T burners clean. So. Think I mainly have a bad sensor. My question is which one. I see 2non the rad and 2 on the motor. I could be looking at it wrong.
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Old 05-02-2013, 07:15 PM
woodenbmw woodenbmw is offline
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Re: Idle has gotten worse

The 2 switches on the rad are thermostatic switches for the high and low speed aux electric fan. I have four switches/sensors on my thermostat housing. I think these are what you are referring to, but without a photo, I can't be certain. My e30 has two temp sending units, but you have a different set up on your car. Post a pic or look on some other threads for more info. Getting your hands on a Bentley manual should be a priority
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  #9  
Old 05-03-2013, 09:05 PM
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BigBoy740il BigBoy740il is offline
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Sounds to me like you have a vacuum leak. When you start the car, the ECU runs on set values (close loop) until the oxygen sensors warms up. A vacuum leak allows unmetered air into the system and prevent the car from developing sufficient vacuum to close the diaphragm in the FPR. Hence the carbon coated plugs.
You should also check the thermo time sensor. It's purpose is to fire the cold start valve for a few seconds until the car warms up. This same valve, located on the passenger side of the intake manifold, could also be leaking.
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Last edited by BigBoy740il; 05-03-2013 at 09:11 PM.
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  #10  
Old 05-20-2013, 06:44 PM
scharf1 scharf1 is offline
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i will be getting a manual. i will also replace all my vacuum lines just be be sure we take that out of the equation. thank you for all the help
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  #11  
Old 05-20-2013, 07:35 PM
woodenbmw woodenbmw is offline
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Re: Idle has gotten worse

It's not just the vacuum lines you should look at, I have found vacuum leaks around fuel injectors and those plastic t's. I used a can of carb cleaner on a cold engine, sprayed around the places I thought might leak until I heard a change in idle. I must add that you be very careful while doing this as you can potentially catch your car on fire. I suggest short sprays on a cold engine. There is youtube video of this process. I hope it helps and good luck.

1987 325e automatic sedan
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  #12  
Old 05-21-2013, 12:59 AM
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Nick323 Nick323 is offline
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Mein Auto: 323i E30 2-door
Post Safety should be considered before the house burns down

I have even used small pieces of rag soaked in fuel to search for an airleak
Let's face it, working on running engines is dangerous & you should take precautions
a fellow mechanic lost an eye & got brain damage by a flex-fan exploding as he revved a motor
Fire can & given time, will happen. I always have a 10L can of water (such as used for watering plants) nearby.
I am not going into a safety diatribe here, but the least should be reachable in your workplace:
Headcvover such as a cap or Beanie
Eye protection
Ear protection
Fire extinguisher
Can of H2O
Another person to help you get out of the dwang

I have cupboards with doors to keep my delicate equipment and spares in, as well as a seperate one for all the chemicals I use daily; such as carb & contact cleaner, acetone etc.

a little Poof in your engine bay or under your car can cause a huge unwanted chain reaction.
Been there, experienced that
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  #13  
Old 05-21-2013, 05:03 AM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Safety all good - Back to mechanics: Change the fuel filter? Check injector pressure?
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  #14  
Old 05-21-2013, 08:11 AM
scharf1 scharf1 is offline
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I have not replaced filter. How do you check injector pressure?
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