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1997 E300 CODES P0400/P0120
I just changed all my GP and cleaned the intake manifold EGR and related flaps on the IM. After clearing the codes from that problem I am now getting P0400 AND P0120 with my check light on. It says P0400 is an EGR flow malfunction and P0120 is a throttle position sensor A circuit malfunction. The car starts and idles well BUT upon accelerating it HESITATES with the RPM going up and down by a few hundred. It seems to clear up after 10 minutes or so of driving. But goes back to its old ways once left for awhile and restarted. Anything I should be looking for. Thanks in advance.
Rod |
#2
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Look for loose or disconnected vacuum connections. Start at the EGR.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
#3
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Quote:
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96 E300d |
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Pull a vac on EGR and make sure it moves. If it does then work your way back from there looking for blockages.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#5
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THANKS guys when I am off this weekend will check all that you mentioned.
Rod |
#6
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It's Something Simple for Sure
If my memory serves me right, the first time I took the intake manifold off I had the same problem and it was simply I forgot to reattach the short small vaccum hose that connects the intake manifold to the MAP sensor which is attached to the "sound wall" by the master cylinder. If the vacuum hose is connected properly I'd still check to make sure the hose or the fitting isn't blocked with muck from your cleaning of the intake manifold or alternatively cracked and leaking.
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#7
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Hit my issuse dead on the head
Quote:
I just had been monkeying with the EGR and Res Flap transducers and vacuum tubing. I could not get rid of my P0400. Then I read this, and popped the hood to find the vacuum tube for the intake pressure sensor rotted. Installed a new tubing and blisssss |
#8
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did you ever resolve this issue? If so, what was it?
Thanks in advance!!
__________________
1987 560SL - 95K 1996 E300D - 183K 1997 E300D - 162K 1982 240D - 160K |
#9
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Just to close this thread....it was one of the vacuum lines off of the intake manifold that was not connected. Upon checking the vacuum lines that were accessible some were brittle so all were changed as well....Codes went away.
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#10
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I wanted to add my recent p0400 code reading. About a month ago I did a complete Biodiesel Submerge with my entire intake. Upon reassembly and start up, a new check engine code P0400 appeared. I took the intake apart 4 times since trying to get this thing to clear. Cleaned all the parts associated with the EGR system. I noticed that on the cross over tube that the mechanism that controls the flapper had a sudden pause in movement. This was caused by the biodiesel somewhat drying out the plastic and not letting it move smoothly, or even buildup. Check both flappers on the cross over tube and underside of the intake body that they move smoothly. If they don't, in my case it'll pop the code. I also cleaned out all the electronic connections with cleaner. All codes are now gone.
There's some simple tests that can determine basic EGR functioning. I found that collapsing the EGR would cause the engine to slow in speed, signifying proper functioning. There's a number of things that can cause this. Just keep checking and rechecking. Good Luck to anyone in the future that like me found this thread useful. |
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