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Re: 1988 mercedes 190 1.8 litre will not rev over 2000rpm
Hi, have you checked the cap and rotor arm, sometimes the spark will track back to the h/t instead of going to the lug in the cap hence a misfire also the rotor can have a hairline crack producing the same symptom check both for cracks, this may be the problem hope this helps
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What config motor? I'm confused is it a 4 litre straight 6 or a V configeration. If straight 6 spray aerostart around nr 1 intake manifold to head if idle picks up you need a new intake gasket this is very common. is it missing at idle, under load (up hill) or both. does it have coil overs (coil on each plug or old leads set up?
do you want to adjust the idle up or down? If your car has too high of an idle, you probably have a vacuum leak. buy a can of starting fluid. Start the car and lightly start spraying starter fluid all over the intake. You will hear the engine change RPMs. When it does, that is where you have a leak. If you want to idle your car up, you will need to adjust your throttle plate. Where your throttle hand moves when you rev your engine, it has a little screw that you can adjust to make the throttle arm stop sooner, allowing more airflow into the engine.
Faulty oxygen sensor or low fuel pressure can also cause these codes to be set. I'd go for a fuel pressure test when acting up if at all possible just to confirm I have pressure needed. Have heard of coil problems as well. Should be a good blue 1" min. spark from coil.
do a compression test ?? about 180lbs anything less and it could need a valve regrind ,if compression seems ok then plugs and leads and use the bosch plugs with the 3 electrodes (for voltswagon) champion are **** and missfire.if still persists change dist cap and leads
Ok there is a number of things that will stop it from revving past 3k from your description I would check the ignition timing for advance mechanical and vacuum .I don't know when you experience the fault or eg while driving or just free reviving in Neutral . BTW 190e does not have limp home mode so there is a real problem. Hope this helps
I have a similar problem which seems to stop ,if after 20 mins of driving or warmed up engine if you stop for 10 mins the revs die to a more normal 1500 revs! it is a spanish car now living in theUK I think the problem is choke related.