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-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 06-14-2007, 01:23 PM
Registered User
Join Date: Sep 2006
Posts: 10
1987 190E Hard Start when warm

Anyone have suggestions for my 190E 2.3 that has a hard start problem after getting warm? It will start fine after sitting for 30 minutes or more but if I stop for just a few minutes and try to start immediately it takes many revolutions for it to kickoff. Otherwise runs great!


Reply With Quote
Old 06-14-2007, 06:03 PM
Registered User
Join Date: Aug 2006
Posts: 141
Hard start

Sounds like the pressure accumulator may be leaking internally!
After the engine has been off for 20 mins. loosen the fuel supply hose to the fuel dist. and see if any pressure exists, if not replace accumulator.
Reply With Quote
Old 06-14-2007, 06:59 PM
Registered User
Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
As mentioned by the previous message, there could be a leak somewhere in the fuel system causing the pressure to drop rapidly after the car is turned off. You will need a fuel pressure gauge to test this.

Also check the fuel injection temperature sensor, also called the coolant temperature sensor. It is the last sensor on the engine, closest to the windshield. Remove the connector, measure the resitance across the sensor terminals - it should be 2.5 to 3.5 Kiloohm at 20 deg-C and should go down to about 250-350 ohm at 80 deg-C. If the resistance does nto change by a factor of about 8 to 10 when engine temp changes from 20 deg-c to 80 deg-c, change the sensor.

The other possibility is the zero position of the airflow sensor plate. But I am assuming that you have not touched this.
Saumil S. Patel
Reply With Quote
Old 07-05-2007, 03:25 PM
Registered User
Join Date: Apr 2007
Posts: 8
Where is the air flow sensor located at? At zero position, what is it indicating? My '85 190E will not start cold or warm. Good sparks and fuel pressure. How does EHA tied into starting? Thanks!
Reply With Quote
Old 07-05-2007, 04:02 PM
Registered User
Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
The air flow sensor plate is under the air filter box. EHA helps provide the fuel as soon as the ignition key is turned on. When you turn on the ignition key, 40 to 60 ma of current should flow through its coil. Check the coil resitance, it should be between 15 and 20 ohms. If you have not touched this plate and the car was working with the current plate setting, I would not mess with it.

Cold start problem could be related to a faulty cold start valve, though there has now been some doubt as to when this valve should function, some say it works only in extreme cold weather, but as far as I can recall, my valve works in Houston, and I have not rechecked it yet, but will do soon. Infact, when you crank and you get close to 12V on the cold start valve terminals, the computer is trying to use it, and when this occurs and no fuel comes out, I would think that it needs to be replaced.

Saumil S. Patel
Reply With Quote


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 11:37 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page