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  #1  
Old 04-23-2006, 10:41 AM
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190e 1.8 auto tick over

Hi i have a 93 k.reg 190e 1.8 auto this car was running a1 till last week when the tick over went up from 800-850 rpm to 1500rpm's and will not go down.
i have put new plugs oil and filters in this week but still the same.
it's a right pain round town..please help
if you need any more info just ask..
cheers all
karl

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  #2  
Old 04-23-2006, 12:09 PM
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Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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  #3  
Old 04-23-2006, 03:19 PM
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Quote:
Originally Posted by sbourg
Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve
cheers Steve
I will try this tomorrow and let you know how it went..
Regards karl
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  #4  
Old 04-25-2006, 03:00 AM
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Quote:
Originally Posted by sbourg
Take off the air cleaner and block the airflow meter inlet with something flat while the engine is idling. If the engine does NOT stall, you have an air leak, probably in one of the idle air hoses or a vacuum line.

Steve
I put a flat card over the airflow meter inlet and it stalls..
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  #5  
Old 04-25-2006, 03:47 AM
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Make sure all your throttle linkage is lubricated. Be sure it moves properly. Have someone push the accelerator pedal while you look at the linkage (take the air filter off) Watch for old and brittle rubber connecting tubes.

If brown telltale rust around the throttle linkage connectors, remove one at a time, clean and lube with something such as ATF. It provides lube but unlike a paste doesn't attract too much dirt.

You can pop the bell cap ends off by using a 10mm wrench end.

Keep us posted.

Haasman
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  #6  
Old 04-25-2006, 11:38 AM
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Remove the electrical connector from the idle control valve to see if idle drops. If so, you may be running too rich. If not, the ICV may be sticking open, and should be cleaned. It is also still possible you have a small air leak - check all air hoses for cracks or loose fitting at connectors, and for vacuum lines disconnected.

Steve
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  #7  
Old 04-26-2006, 03:26 PM
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Quote:
Originally Posted by haasman
Make sure all your throttle linkage is lubricated. Be sure it moves properly. Have someone push the accelerator pedal while you look at the linkage (take the air filter off) Watch for old and brittle rubber connecting tubes.

If brown telltale rust around the throttle linkage connectors, remove one at a time, clean and lube with something such as ATF. It provides lube but unlike a paste doesn't attract too much dirt.

You can pop the bell cap ends off by using a 10mm wrench end.

Keep us posted.

Haasman
Hi Hassman
Thanks for the info. I looked at all the linkage's today and it looks in very clean condition ie no rust i have lubed all the moving parts.
but still runs the same.
Cheers karl
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  #8  
Old 04-26-2006, 03:33 PM
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Red face

Quote:
Originally Posted by sbourg
Remove the electrical connector from the idle control valve to see if idle drops. If so, you may be running too rich. If not, the ICV may be sticking open, and should be cleaned. It is also still possible you have a small air leak - check all air hoses for cracks or loose fitting at connectors, and for vacuum lines disconnected.

Steve
Hi Steve
I went out to my car and disconnected the idle control valve and it drops to a 850rpm spot on.But when i put it back on the engine revs to 1500rpm again so may be running to rich. It was getting too dark to check all the air hoses.will check tomorrow..I have the car booked in at a mercedes main dealer on 29th i hope they fix it quick as they charge £80 per hour labour..(robbing gits)
Cheers Karl
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  #9  
Old 04-27-2006, 12:30 AM
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If the car is running rich, the ECU may increase the idle to compensate if the EHA is out of range. However, idle is still too high with the idle valve disconnected. This makes me suspect there is still an air leak.

Steve
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'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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  #10  
Old 04-29-2006, 12:01 PM
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Quote:
Originally Posted by sbourg
If the car is running rich, the ECU may increase the idle to compensate if the EHA is out of range. However, idle is still too high with the idle valve disconnected. This makes me suspect there is still an air leak.

Steve
Hi been to the garage today and had a new icv valve (old one not working to good) fitted and had all the vac and air lines checked all fine had the cold start valve checked all ok!
car still runs the same
they could put it on the computer they say it's to old. it's a 93.reg on a k.plate.....£178 later still the same I'm not a happy man....anyway got to go now and bash my head on a wall.....
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  #11  
Old 05-01-2006, 12:37 AM
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I would pull the electrical connectors off the EHA, and then the O2 sensor, and see what happens. If neither drops the idle, then check for air leaks on your own. see if the air hoses are soft and pliable when you pinch the gently. If they seem hard and don't give, then you probably have air leaks at all the interconnects, where they will fit loosely. Replace any such hoses.

Steve
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'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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  #12  
Old 05-01-2006, 04:39 PM
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Quote:
Originally Posted by sbourg
I would pull the electrical connectors off the EHA, and then the O2 sensor, and see what happens. If neither drops the idle, then check for air leaks on your own. see if the air hoses are soft and pliable when you pinch the gently. If they seem hard and don't give, then you probably have air leaks at all the interconnects, where they will fit loosely. Replace any such hoses.

Steve
Hi Steve whats Eha ? and where is the 02 sensor on my 1.8
cheers karl
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  #13  
Old 05-02-2006, 01:14 AM
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The Electro-Hydraulic Actuator is screwed to the firewall side of the fuel distributor, and the O2 sensor is screwed into the exhaust manifold (but not to be confused with the EGR valve, which has no electrical connector). This would be on my 2.3 - your 1.8 may be different.

Steve
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'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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  #14  
Old 05-03-2006, 02:12 PM
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Thumbs up

Quote:
Originally Posted by sbourg
The Electro-Hydraulic Actuator is screwed to the firewall side of the fuel distributor, and the O2 sensor is screwed into the exhaust manifold (but not to be confused with the EGR valve, which has no electrical connector). This would be on my 2.3 - your 1.8 may be different.

Steve
Hi Steve
Thanks for the info..it is eha that is dead.. I disconected this today and the revs go down to 500 rpm, then I rang mercedes main dealership and was quoted £348 + vat=$500 bucks for the part silly money !
am going to a breakers yard in london this weekend let you know how it goes and thanks again you've been a really big help
kind regards karl (from sunny London)

ps i think in the uk we call the 02 sensor the lambda sensor. and the eha is airflow sensor..
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  #15  
Old 05-06-2006, 05:12 PM
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Unhappy

Just got back from london with some s/h parts for my car. First i fitted the air-flow sensor on the side of the inj unit and still the same. Then fitted the 2nd air-flow sensor and still the same.....Just in case 1 was bad i got 2 sensors. Then i fitted a mircoswitch (I got 2 of these as well) to the fuel linkage but same again still ticks over at 1200/1500 rpm's...
so please i need help asap .....

any idea's Steve
regards Karl

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