W124 E420 Bogging - PeachParts Mercedes-Benz Forum

jkazzoun · #1 12-14-2009, 06:20 PM

So, the mechanic called back again this afternoon and says it runs fine now, though he has no idea why. He did fix some leaks around the fuels pumps, though he said fuel pressure was fine.

One guy there thinks it's bad fuel from the station across the street and that several people have had problems because of that. However, I don't buy it. It's been going on a while and we've gotten gas at several places.

No guarantee this thing won't come back all of a sudden (I think it will). Maybe it is the eta and they just bumped it. Who knows...

I'll report back if it returns and we actually learn something. I promised the mechanic the same...

jkazzoun · #2 12-14-2009, 06:26 PM

@jhodg5ck

Thanks. I think they did. They asked me about the main harness while I was there and seemed to be inspecting all.

I think they were quite thorough. They've put about 10 hours into this thing (they billed me for three, replacing brittle vacuum tubes that cracked, the fuel leaks, etc.).

jhodg5ck · #3 12-14-2009, 06:33 PM

Quote:

Originally Posted by jkazzoun

@jhodg5ck

Thanks. I think they did. They asked me about the main harness while I was there and seemed to be inspecting all.

I think they were quite thorough. They've put about 10 hours into this thing (they billed me for three, replacing brittle vacuum tubes that cracked, the fuel leaks, etc.).

That's good.. Sometimes MAF's on these cars Won't throw codes even though they are acting up.. Pays to have good used to swap.

I'd ask if they did an injector test (in SDS)...I'm guessing they checked the fuel pressure reg..

Sometimes it pays just to unplug and reconnect everything, ie wires/modules/relays etc.. A bit of corrosion can cause Strange things to happen!

Jonathan

----------------
Now playing: Dave Matthews Band - Let You Down
via FoxyTunes

simonshearer · #4 12-14-2009, 06:48 PM

"bog"

73Elsinore · #5 12-14-2009, 07:27 PM

Quote:

Originally Posted by jkazzoun

replacing brittle vacuum tubes that cracked

Were those the 6L6GC's or KT66's? Every 400E has (6) KT66's in the output stage. You need those for maximum distortion

Sorry, couldn't resist!! I saw 'vacuum tubes' in your post and my pea brain just switched gears on me... crawling back under my rock now...

hanno · #6 12-14-2009, 06:27 PM

For what it's worth, I was playing parts swap trying to pin down an ABS issue on the 87 (solved!). To get to the ABS module, the ECU had to be removed/installed. When all was done and car restarted, it idled low, would bog upon giving it throttle, but clear up and run at high RPM. I had installed the electrical connector on the ECU but not all the way (some pins connected, some not). Another 1/4" and latched down and all was well.