E280 a misfire when a/c is ON

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Igorniko
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Joined: Thu 14 Dec, 2017 10:38 pm
Model you own: w124
Location: Adelaide

E280 a misfire when a/c is ON

Post by Igorniko » Thu 14 Dec, 2017 11:02 pm

Hi! Has anybody dealt with this problem? During wintertime engine worked well but now it is not... At idle when I switch off a/c the angine works without any problem but once I push EC button and activate aircon the engine starts jiggleing. Also sometimes I see that there is a loss of power when accelerate at 2500rpm approx. What can it be??
'94 W124 E280, 235000km
Previously: '92 W124 200E (saved my life in an accident)

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Tony From West Oz
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Re: E280 a misfire when a/c is ON

Post by Tony From West Oz » Fri 15 Dec, 2017 12:24 am

With the EC button out and the A/C on do you still get the misfire?
Most likely cause is a vacuum hose perished causing poor vacuum to one or more devices.
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (occasional tourer)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

Igorniko
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Joined: Thu 14 Dec, 2017 10:38 pm
Model you own: w124
Location: Adelaide

Re: E280 a misfire when a/c is ON

Post by Igorniko » Fri 15 Dec, 2017 7:21 pm

Tony From West Oz wrote:
Fri 15 Dec, 2017 12:24 am
With the EC button out and the A/C on do you still get the misfire?
Most likely cause is a vacuum hose perished causing poor vacuum to one or more devices.
I've noticed today that I got misfire (once every 20 sec) when the A/C was off (at the intescection while waiting for traffic light).. But when I switched on the A/C the misfire (jiggling) appeared every 3-5 seconds.

Vacuum hoses look good but I still cannot see the full picture... Maybe it is coils or spark plugs?
'94 W124 E280, 235000km
Previously: '92 W124 200E (saved my life in an accident)

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Ivanerrol
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Re: E280 a misfire when a/c is ON

Post by Ivanerrol » Fri 15 Dec, 2017 7:39 pm

This is you : :pray: :pray: :pray: :pray: The prayer man.

Hopefully it's not your wiring. You may have heard of the dreaded eco-wiring of the '92 - '96 model Benz's

Misfires are generally electrical - which includes coils, leads and plugs.

First step is to check your plugs. The plugs required are plain old copper $3.00 ones. Nothing fancy - no iridium, no platinum, no multi pronged or no resisitive types.
Second check your plug leads. make sure there are no cracks or any "hardness in the leads. Get a Multimeter - check the resistance end to end - it should be around 1100 ohms. The plug ends actually have the resistance value on them.
Thirdly - coils are generally sound. When they break down they give a constant misfire. One coil fires two cylinders. On your year E280 M104 you have 3 coils. They are mounted underneath the manifold.

Fourth do a goggle search of eco wiring '90's Benz's.

W124 series II M104's are great cars. I would have no hesitation on spending the dollars getting a repaired or new wiring harness as long as there are not too many other dollars required on other issues with the car.
W211 - E240
W204 - C280
W210 - E240
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

Igorniko
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Joined: Thu 14 Dec, 2017 10:38 pm
Model you own: w124
Location: Adelaide

Re: E280 a misfire when a/c is ON

Post by Igorniko » Fri 15 Dec, 2017 8:47 pm

Ivanerrol wrote:
Fri 15 Dec, 2017 7:39 pm
This is you : :pray: :pray: :pray: :pray: The prayer man.

Hopefully it's not your wiring. You may have heard of the dreaded eco-wiring of the '92 - '96 model Benz's

Misfires are generally electrical - which includes coils, leads and plugs.

First step is to check your plugs. The plugs required are plain old copper $3.00 ones. Nothing fancy - no iridium, no platinum, no multi pronged or no resisitive types.
Second check your plug leads. make sure there are no cracks or any "hardness in the leads. Get a Multimeter - check the resistance end to end - it should be around 1100 ohms. The plug ends actually have the resistance value on them.
Thirdly - coils are generally sound. When they break down they give a constant misfire. One coil fires two cylinders. On your year E280 M104 you have 3 coils. They are mounted underneath the manifold.

Fourth do a goggle search of eco wiring '90's Benz's.

W124 series II M104's are great cars. I would have no hesitation on spending the dollars getting a repaired or new wiring harness as long as there are not too many other dollars required on other issues with the car.

Thanks a lot!!!

The engine harness was replaced 4 years ago (previous owner spent $4000 on it). So I believe that this is ok..

I've also read the fault codes - there is 085 code still in place (Model 124, 129 and 140: AIR pump switchover valve (Y32) and/or electromagnetic AIR pump clutch (Y33)) - I have NO air pump and NO air pump clutch on my car so this is also not the issue (I believe :pray: ).

I suspected plugs / high voltage wires or coils but was unsure.

Now I will start from step 1 - buy new plugs (the last change was 7 years (45K) ago). You've noticed that there should be basic ones.
Are these good ones: Bosch Super Spark Plug F8DC4??
'94 W124 E280, 235000km
Previously: '92 W124 200E (saved my life in an accident)

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Ivanerrol
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Re: E280 a misfire when a/c is ON

Post by Ivanerrol » Fri 15 Dec, 2017 9:04 pm

Igorniko wrote:
Fri 15 Dec, 2017 8:47 pm

The engine harness was replaced 4 years ago (previous owner spent $4000 on it). So I believe that this is ok..

I've also read the fault codes - there is 085 code still in place (Model 124, 129 and 140: AIR pump switchover valve (Y32) and/or electromagnetic AIR pump clutch (Y33)) - I have NO air pump and NO air pump clutch on my car so this is also not the issue (I believe :pray: ).

I suspected plugs / high voltage wires or coils but was unsure.

Now I will start from step 1 - buy new plugs (the last change was 7 years (45K) ago). You've noticed that there should be basic ones.
Are these good ones: Bosch Super Spark Plug F8DC4??
They are the OK plugs. The NGK equivalent is BCP5ES - it might be hard to find those Bosch plugs now.
45K's and 7 years is getting up there for plain old $3.00 plugs. This "maybe" your issue.

Wring harness done :occasion5:
W211 - E240
W204 - C280
W210 - E240
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

Igorniko
Posts: 4
Joined: Thu 14 Dec, 2017 10:38 pm
Model you own: w124
Location: Adelaide

Re: E280 a misfire when a/c is ON

Post by Igorniko » Fri 15 Dec, 2017 9:42 pm

Thanks again! Will change them and then report on the result!!
'94 W124 E280, 235000km
Previously: '92 W124 200E (saved my life in an accident)

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