W210 M112 Fuel Injector Power
Thread Starter
Newbie
Joined: Apr 2012
Posts: 5
Likes: 2
w124 w210
W210 M112 Fuel Injector Power
My 2002 W210 M112 has a misfire on cylinder 3 which seems to be caused by a lack of pulse.
When starting all is good, but after a few seconds, cylinder 3 shuts off. I have tried with a test light to the injector plug, it blinks as it should for a few seconds, but then goes off. I have also tried to connect a fuel injector to the plug, clicks fine for a few seconds, then shuts down.
Connection to ECU is checked and good.
DTCs found:
P0203 (Y62y3 cylinder 3 fuel injector) - MIL on & current
P0300-80 (Misfire cylinder 4) - MIL on & stored & current
P0304-82 (Misfire cylinder 4) - MIL on & current
P0303-83 (misfire cylinder 3) - MIL on & stored & current
P0303-67 (Misfire cylinder 3) - current
P0304-69 (Misfire cylinder 4) - current
When starting all is good, but after a few seconds, cylinder 3 shuts off. I have tried with a test light to the injector plug, it blinks as it should for a few seconds, but then goes off. I have also tried to connect a fuel injector to the plug, clicks fine for a few seconds, then shuts down.
Connection to ECU is checked and good.
DTCs found:
P0203 (Y62y3 cylinder 3 fuel injector) - MIL on & current
P0300-80 (Misfire cylinder 4) - MIL on & stored & current
P0304-82 (Misfire cylinder 4) - MIL on & current
P0303-83 (misfire cylinder 3) - MIL on & stored & current
P0303-67 (Misfire cylinder 3) - current
P0304-69 (Misfire cylinder 4) - current
Last edited by Hougaard; Apr 17, 2021 at 02:05 AM. Reason: Adding DTCs
Newbie
Joined: Apr 2021
Posts: 12
Likes: 1
From: Los Angeles
2000 W220 S500 1999 W210 E320 (Retired to State)
Might seem like a silly question, but did you check the spark plugs?
There Are a few issues I learned about M112 era engines. 1) change the crank sensor at the rear of the motor. 2) change your voltage regulator on the alternator.
I am not advocating checkbook diagnosis. But, these two items will cause erratic duty cycle issues.
My plugs were eight years old and were 100% fouled. Plus, for some reason, the right side injectors fail open. My motor exploded because 1.5 quarts of gasoline were in the oil pan.
There Are a few issues I learned about M112 era engines. 1) change the crank sensor at the rear of the motor. 2) change your voltage regulator on the alternator.
I am not advocating checkbook diagnosis. But, these two items will cause erratic duty cycle issues.
My plugs were eight years old and were 100% fouled. Plus, for some reason, the right side injectors fail open. My motor exploded because 1.5 quarts of gasoline were in the oil pan.
Newbie
Joined: Apr 2021
Posts: 12
Likes: 1
From: Los Angeles
2000 W220 S500 1999 W210 E320 (Retired to State)
Oh, good. Do you get a particular OBDII error code? The driver transistor for cyl #3 may be faulty. I have in the past reflowed solder joints in Motronic ECUs.
Member
Joined: Jul 2012
Posts: 91
Likes: 3
From: Charlotte, NC
10 C63/p31, 84 190/5.8L, 14 Audi Q5 TDI, 03 Suburban /8.1, 87 Porsche 944/358" 77 Ferrari 308 Dino
Replace my ECU or what to do for reliability now??
My 2010 C63 eats injectors like no tomorrow. It has been to the dealer to find out why and noting can be found. Right now it runs fine but scared to drive out of town unknown when another injector goes bad! In the last 6000 miles, I have replaced 14 injectors, once it was hydrolocked filling #7 with gas! I read on a Bosch site that said "Thermal damage to the solenoids as a result of incorrect triggering currents" That appears to show maybe a defective ECU ! So I sent the ECU to a shop that repairs electronic equipment and was told the main driver on the ECU mother board can not be replaced as it is in the middle of the board and suggested finding a used good board and have it programmed to replace my bad ECU. Is this price the same as a new OEM unit from MB and as reliable? My car only has 18,764 miles on it.
Where is there a terrific MB dealer to buy a new ECU (ECM) from to have programmed to my car??
Anyone else heard of this problem?? My injectors are NOT Chinese, just the typical Bosch #62421units!
Thank guys and Gals
Where is there a terrific MB dealer to buy a new ECU (ECM) from to have programmed to my car??
Anyone else heard of this problem?? My injectors are NOT Chinese, just the typical Bosch #62421units!
Thank guys and Gals
Newbie
Joined: Apr 2021
Posts: 12
Likes: 1
From: Los Angeles
2000 W220 S500 1999 W210 E320 (Retired to State)
I see things in wrecking yards that verify there is a pattern. Like another M112 that exploded!
I bought a replacement motor on Ebah for $524.00... It had near perfect dry compression! I used the three left side injectors from my old engine. Open the valve covers on the received motor and, damn! the right side head is showing signs of being cooked! These generations of Bosch ECUs are nearly identical across BMW and MBZ. I am unaware of BMWs having this same issue of injectors causing hydrolock. It literally just may be the Bosch injector for MBZ is flawed.
I bought a replacement motor on Ebah for $524.00... It had near perfect dry compression! I used the three left side injectors from my old engine. Open the valve covers on the received motor and, damn! the right side head is showing signs of being cooked! These generations of Bosch ECUs are nearly identical across BMW and MBZ. I am unaware of BMWs having this same issue of injectors causing hydrolock. It literally just may be the Bosch injector for MBZ is flawed.
