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#1
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om602 idle too low
Hi all,
seeking your thoughts on my latest issue. 1992 300D 2.5 turbo om602 361,xxx miles. egr delete and pressure wastegate. headed home from work the other day everything is fine. Rolling on the highway 85mph, AC Blasting. Chillin' pull off the exit to go up the hill to my house and there's a problem. sitting in traffic waiting to get through a light and engine RPM are down at idle. right about 450rpms. I was immediately concerned so i pulled over real quick and just did a quick visual check under the hood. nothing obviously amiss. no smoke, fumes, leaks, sounds, smells out of the ordinary. continued on to the house and shut down. Came out later and checked some more. oil looks fine, coolant looks fine, fuel looks fine. fuel and air filters are recently changed. Apparently nothing wrong mechanically. I've looks all over the linkages and everywhere under the hood and have not found anything the looks out of the ordinary. just the low idle. each time i've started since then same thing with the low idle. Drove to work this morning no problems at all out on the road as long as i just kept my foot on the pedal to keep the idle up a little bit when i was stopped. any ideas?
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#2
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My understanding is that the idle on your car is controlled by the computer (in fact, that's all it does now that you've done the wastegate conversion). So that would be a possibility.
Here is the procedure for testing the computer (the EDS): http://www.w124performance.com/service/w124CD1/Program/Engine/602_603/07.1-1120.pdf
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 08-31-2018 at 01:14 PM. |
#3
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That is my understanding as well. I don’t know much about it. I’ve read a few threads on idle problems. “Hunting” idle seems to be a common failure mode
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#4
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Just edited my post to include link to test procedure.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#5
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Actually here's link to test idle speed in particular:
http://www.w124performance.com/service/w124CD1/Program/Engine/602_603/07.1-2006.pdf
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#6
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As mentioned above, idle speed is controlled by the EDS computer. Do you have other symptoms of problems, such as an ABS light or intermittent tach? If so, you probably have a bad or failing OVP relay.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#7
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no other symptoms that i have noticed. No lights on the dash. tachometer solid steady.
battery voltage good. charging 13.5ish volts at around 1200 rpms
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#8
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Im with Dieseal300 OVP
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#9
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Im with Dieseal300 OVP
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#10
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Check that the connector is firmly plugged into the ELR actuator, the round thing at the back end of the IP.
Sixto 98 E320s sedan and wagon 02 C320 wagon |
#11
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I have unplugged and plugged the wiring for the actuator a couple times. no change
can someone tell me where the resistance timing plug is located? i will be working through the test procedure to see if i can isolate the problem.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#12
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#13
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Where is the EDS located on our cars? How would one access it?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#14
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Should be in the cubby behind the battery. I don’t think the 2.5 turbo has idle speed adjustment. The ‘87 300D/TD has a trim knob by the brake booster, IIRC.
Sixto 98 E320s sedan and wagon 02 C320 wagon |
#15
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If it doesn't have the round trim resistor, it will have a single rectangular trim resistor. You can change idle speed by changing the resistor.
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