Hi all.Iam back with another problem. I dont know if i should call it rough ideling or something else, but while ideling,i can smell gas from inside the car and there is a shake in the engine, when engine is cold, it starts OK without any probs. But when not cold, on starting, it seems that the engine is struggling to bring the idle 2 normal, it stays like that 4 bout 4-5 seconds and becomes normal, but then it starts shaking,when i start driving, engine performs perfectly ok. I showed it 2 a mercedes expert, he checked it out and told me that one of the injectors in the fuel distributor, or dont know technical name 4 those, is running rich on gas,thats what causes the shake in the engine.He told me that it dosent look that bad so what he's gonna do is 1st do the tune-up, 2ndly adjust the fuel-air mixture.He said even after doing that he does not guarantee that the shake is gonna go away. He said i might get lucky. He is asking $500 for the job. Now i just need some expert opinions about the situation. Should i go 4 it and risk my $500 or do the tune-up my self without the mixture setting offcourse? Could it really be the fuel distributor? is it a common problem? Thanx in advance guys.
I doubt very much that it is the fuel distributor.
It could be a bad fuel injector, but there are no injectors in the fuel distributor.
It sounds to me like an electrical problem. I would replace my spark plugs first and then the leads (wires). Check the distributor cap and rotor arm for cracks.
My reasons for this are:
When the car is cold there is no problem. Because the mixture is richer, the spark does not need to be as powerfull.
When it is warm you can smell fuel. Because there is a misfire on one cylinder and the fuel is not getting burnt so it is passing through the exhaust unburnt.
Another option would be to take it to a Bosch diagnostic agent, after all the system was made by them.
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Running rich could indicate a fault in the Bosch CIS, including an inactive O2 sensor, especially since you notice that the car starts and idles fine, but after awhile (when the O2 sensor would have gotten up to temperature) it appears to run rich and could be fouling the plugs. Likewise, a clogged or restricted fuel injector could also be a problem too. As for the shake . . in addition to all the above, what kind of condition are pnuematic motor mounts in?
Thanx guys 4 the input. MTI, whats a Bosch CIS? Yes u r right, one of the injectors or the O2 sensor could b bad.So what u guys suggest that i should do 1st then? well i think change the plugs, wires, cap and rotor 1st and then see if does any good.If it remains the same, problem is not electrical then.And by pnuematic motor mounts, u meant engine mounts? I dont know how 2 check those.Thanx again guys.
The Bosch CIS is the fuel injection system, which on the W201 is primarily mechanical with fuel/air mixture modified by the Electronic Control Unit (ECU). The mechanical system's sole benefit is that it will default into "limp home" mode if the electronics stop working, compared to more modern Electronic Fuel Injection (EFI). This is also why there isn't really a "chip tunning" solution for our cars. Replacing the fuel injector is pretty cheap if you shop around for the injector, under $25 each. You can test the motor mounts by visually checking how far the engine is sitting on the mount and then trying to rock the motor on the mounts to see if there's much play.
Sorry guys to get back 2 this topic after so long. It was so cold that i couldnt do anything on the car back then. Anyways as spanners suggested to do the tuneup, i did that, i changed the cap, roter, plugs and wires but the problem is still there.I still get the shakes and smell fuel. So electrical problem is out of question now i guess. As MTI suggested about the O2 sensor going bad, dont u think i should get some kinda indication 4 that? Anyways, what do u guys suggest i should do now, replace the 02 sensor, check the injecters, how can i check them?Is mixture setting important?Can it do any good? I was also thinkng of getting the car checked at a MB dealer, but my brother says i'll just end up spending lot of money and they wont b able to figure out the actual problem. Last time i had it checked at a MB expert, not a MB dealer and he told me that the fuel distributor is running rich on 1 cylender,he was asking $500 4 the job and without guarentees. I dont know if he is right or not. Any suggestions.
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