Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-29-2003, 06:12 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Unhappy My last cry for help on my 300E

Hello Board, my 300E has this frustrating hesitating problem:


During the first start of the day, the car idles seamless and throttle response is great. Well after about 10 minutes of driving, the car will develop a slight hesitation. After about 20 minutes of driving, the car will SEVERLY hesitate and idle becomes rough. When I press on the gas, the car will NOT respond for about 2 seconds, and then shoot off like a rocket. This is very dangerous when I an trying to merge into traffic.

I have a feeling that it might be fuel pressure related, because it is as if the fuel pressure builds up overnight, and then after driving the fuel pressure will fall and that is when the car starts to hesitate.

Any opinions on what could be the culprit??

Electrical?
Fuel pressure?

Ohh I have changed so many parts
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #2  
Old 11-29-2003, 06:15 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
The list of parts:

-OVP Relay
-Voltage Regulator
-new fuel filter
-New Cap
-New Rotor
-New plugs
-New wires
-new vacuum lines
-injector seals
-new injectors
-new radiator
-new thermostat
-new vacuum sensor on top of engine(has 2 vacuum lines coming out of it)
-New coolant temp sensor
-new aux fan temp sensor
-new gas cap
-New fuel sending unit
-Cleaned idle control valve
-new 02 sensor
-fuel mixture was corrected to spec
-cleaned all electrical connections
-new air filter
-cleaned throttle plate
-new aux fan
-spent lots of $$$ on Techron
-Spent lots of $$$ on diagnostics
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #3  
Old 11-29-2003, 06:32 PM
michael cole's Avatar
Registered User
 
Join Date: Apr 2002
Location: waterloo ontario
Posts: 730
fuel pump relay.known to develop poor solder connections
Reply With Quote
  #4  
Old 11-29-2003, 07:35 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Is there any way to open the relay and check the soldering joints without damaging the relay (any further)?
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #5  
Old 11-29-2003, 08:06 PM
Registered User
 
Join Date: May 2003
Posts: 62
Could be a crank shaft position sensor or a bad fuel pump. The pump building pressure is impossible over night it only looses it. See how much fuel pressure you have and check volume of fuel too then if everything checks out i would change the csps.
__________________
1982 300D Turbo (Mom's)
1993 BMW 525I (Dad's)
2001 Vw Golf (Brothers)
2002 Nissan Ser SpecV (Im the Black sheep lol)
Reply With Quote
  #6  
Old 11-29-2003, 08:41 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
What is the price of a crank shaft position sensor???
Where is it located??
Can it be tested?

I know that fuel pumps are pricey, so I hope that mine are good.
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #7  
Old 11-29-2003, 08:51 PM
haasman's Avatar
Registered User
 
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097
This might be a long-shot, but someone had posted that they also had a weird hesitation problem, went through a long list of parts and repairs, time and money, but it turned out to be the ceramic insulator behind the rotor, under the distributor cap.

Now how anyone would ever know to check this, amazes me. My guess is that it was cracked and allowed the coil spark to ground out to the head.

Since your problem is worse as the engine gets warmer, it may follow that a tiny hair line crack expands as it gets warmer.

May be worth it to check it out. Only takes a few minutes.

Haasman
__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
Reply With Quote
  #8  
Old 11-29-2003, 08:56 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
I have heard of that problem before, but I never thought it might be the problem to my cars hesitation.


What is that ceramic insulator called?
Is that an expensive part?
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #9  
Old 11-29-2003, 09:09 PM
haasman's Avatar
Registered User
 
Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097
It is called a Suppressor Cover, made by Bosch, lists for $63.00, but our friends at FastLane (this site) sell it for only $20.51.

It is found online in the Engine Electrical section, just below Starter drive in the list on the right.

Haasman
__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
Reply With Quote
  #10  
Old 11-29-2003, 09:10 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Thanks a lot!! Tomorrow I will check mine and see if it is cracked.


Any more suggestions?
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #11  
Old 11-30-2003, 12:46 AM
Registered User
 
Join Date: Mar 2003
Location: Milwaukee Wisconsin
Posts: 1,149
If the engine runs good when cold, but runs poorly when hot, check the EGR valve and the vacuum hose leading to it. The diaphram should not be cracked and it should be free to move the "plunger" in and out. The EGR valve is closed when the car is cold, but is modulated as needed when the engine is up to temperature. If it sticks open, the engine will run poorly at idle or low speed. Carbon build up is the culprit for sticking most of the time, but it can be cleaned off. Also look at the gasket.
__________________
Resistance is Futile.
Reply With Quote
  #12  
Old 11-30-2003, 01:29 PM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
Try this, and it will set a check engine light if your equipped. Pop up the passenger carpet and unplug the O2 sensor, if the hesitation goes away, check the base lambda adjustment (after plugging the O2 back in) if it is in line (35-55%) check for vauum leaks including the vacuum switch on the head for the EZL. Check the throttle plate for sticking and clean it up a bit while your at it. I had one of these doing something similar that had a rusted out freeze plug at the rear of the intake, due to roller noise, you never heard the leak, it had been covered up to a point by way of a overly rich CO adjustment.



Joe
__________________
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
Reply With Quote
  #13  
Old 11-30-2003, 10:48 PM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
Today was a good day

Hello Board,

Well today, I checked the supressor cover. It had a few small cracks on it, but I had trouble removing it because the plate in which the rotor was attached to, would not budge. There was an allen screw in the center that I removed, but it still would not move. Does anyone have directions on how to remove the "rotor plate" so I can examine the supressor cover better???
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #14  
Old 12-01-2003, 11:50 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Quote:
Originally posted by joe p
I had one of these doing something similar that had a rusted out freeze plug at the rear of the intake, due to roller noise, you never heard the leak, it had been covered up to a point by way of a overly rich CO adjustment.
Joe
Just curious, how did a rusted freeze plug cause a vacuum leak??
Reply With Quote
  #15  
Old 12-01-2003, 12:31 PM
Registered User
 
Join Date: Sep 2003
Location: France
Posts: 487
Have you checked the fuel pump relay? some soldering may broken.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 09:39 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page