Quote:
Originally Posted by bmwe91974
hey I've got be adjusted my valves so my 3.5 sounds super nice.
But idling is the very up and down. it will say that it's hard to keep the engine idling. When I give it gas so there is no problem. Does anyone know what i should look for:???:
You did not provide much information about the subject vehicle and since your heading mentions "adjustment" something may be lost in translation.
Did this problem exist before you adjusted the valves?
You describe a wandering or erratic idle. This can indicate a fuel mixture that is either too rich or too lean. It can be caused, as has been suggested, by a vacuum leak or leaks, especially if you inadvertently removed or disconnected a vacuum hose. However, that type of vacuum leak usually results in an increased idle speed.
If you were using carburetors, my first inclination would be to check the mixture settings or insure that all idle circuits/jets are clean. But, since you have a 3.5 L engine, I would guess you are probably running fuel injection and possibly a more modern "L" Jetronic system with an oxygen sensor fitted to the exhaust. If this is the case, I would check to make sure all of the electrical connections are clean (corrosion free) and tight and this includes all sensors and the air flow meter. Of course, checking similar connections with the DJet is always a good idea too, since a bad connection could also affect the idle.
Naturally, the above suggestions presuppose your ignition system is in working order with properly adjusted timing and that you have not overlooked something obvious like disconnected or mis-connected plug wires or improperly gapped plugs. There are a lot of basics, check them all.
Good luck.
Tuborg hof.
To be on the safe side, assuming your engine is stock, with a stock camshaft, hopefully you adjusted the valves to the recommended clearance when the engine was cold? http://www.bmwe34.net/E34main/Maintenance/Engine/valve_adjust.htm
Adjustments are different for a Djet system versus an LJet system. The DJet will have a pressure sending unit also known as a map sensor. (*See first picture) It is ordinarily found bolted behind the brake booster and below the coolant reservoir tank. This device is connected by a vacuum hose to the vacuum manifold.
If you have an LJet setup, it will likely have a big air flow meter (big silver object in center of picture) between the manifold and the air cleaner. The above DJet system doesn't have this, but the picture below does. If in doubt, post a picture of your engine.
If you have the DJet system (middle picture) I would not only check for vacuum leaks, but I would want to eliminate the possibility that you have a stuck or leaky cold start valve. If that valve leaks or does not shut off completely, it will cause a rich mixture symptomatic of your issue. It is at the very top and middle of the intake manifold log. You can try disconnecting the wires and see if you notice a difference, or even better, remove and plug the fuel line connected to it.
If the cold start valve is a non-issue, the simplest idle adjustment might be the potentiometer (round knob) found on the ECU (computer) found under the right rear passenger seat. In simple terms, turning the knob can alter the idle mixture. This assumes that other fuel injection equipment, e.g., throttle position sensor, is functioning and adjusted properly. Caution: before making any changes, it is a good idea to mark your starting point. If this adjustment produces no change, you really should find someone with hands on experience or consult the shop manual.
If you have an LJet system, you would be better off consulting an E12 or E24 forum for guidance. (For example, search LJet FAQ here: http://www.firstfives.org/
It would also be a good idea for you to consult the reference works here: http://www.cscoupe.org/tech/autobooks/autobooks.html http://www.cscoupe.org/tech/handbook/gallery.htm http://www.cscoupe.org/tech/dljet/dljet.html.
Hope this helps and held og lykke. :wink:
67? 327? 350? http://www.firstgencamaro.com/1967.html
I took a picture of the engine and it must be Djet system. Is there a big difference Djet and Ljet, and which of the two systems are the best! here is a little video of me running in the hall who can see how the momentum running up and down.
and to [/ QUOTE] I have a 383 cov.67 Camaro Amerikan muscles:twisted:
ps I dont konw wher the potentiometer is.
se my video on youtube bmw e9 driving indoor
many thanks to you all.http://www.youtube.com/watch?v=bspyr9F_o0s
It looks like you have a very clean car. But it is not easy to tell much about your idling issue from the video. Idle speed seems a little slow, but it is hard to say without seeing things in person. Does the engine come close to stalling if you have the lights and other accessories on?
From the video, it may be that the only thing you need to adjust is the idle speed. This can be accomplished by turning the fat screw (at the lower part of the throttle body) counter clockwise. If you can locate the throttle position switch and pretend you are sitting in the car looking at the switch, the screw is at 7'o'clock position. The picture below may help. The potentiometer is the knob on the box containing the computer. Lift the right rear seat and you should see it on the floor. If you have a knob on the computer, you have a DJet.
LJet system is far more modern than the DJet. When the DJet works well, it is more than adequate for the engine. However, the LJEt is probably considered far superior, because it is more modern and far more precise at delivering fuel. As to which system is the preferred system, it depends on who you ask. The E9's were originally equipped with DJets not LJets.