Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Search Auto Parts

No warm start


  Email This Post



gatliff
User

Dec 26, 2009, 3:38 PM

Post #1 of 7 (3069 views)
post icon No warm start Sign In

89 190E 2.6 mercedes after repairing a bad ovp wire and replaceing the ovp it self. The car would start and run fine it would idle to fast play with that and got the idle down but now it won't start when it warm it start good cold.
But after it warm up forget it, it turn over good can hear the fuel pumps What do I look for?


(This post was edited by Sidom on Dec 26, 2009, 4:01 PM)


Sidom
Veteran / Moderator
Sidom profile image

Dec 26, 2009, 4:03 PM

Post #2 of 7 (3063 views)
Re: No warm start Sign In

You should start with the basics and see what you're missing spark or fuel to see which direction that will lead you.

I'm assuming you replaced the over voltage protect relay with a new one & not used....


gatliff
User

Dec 26, 2009, 6:25 PM

Post #3 of 7 (3053 views)
Re: No warm start Sign In

The OVP is used the fuse is good and seem to be working. The car start and run good cold but warm it turn over but won't start it act like there no spark , I hear the fuel pumps working but it won't start there are no wires unplug or broke. The only other thing I did was adjust the accelerator cable it had a to fast a idle it was ok before that I don't know what to look for


steve01832
Veteran
steve01832 profile image

Dec 26, 2009, 6:38 PM

Post #4 of 7 (3047 views)
Re: No warm start Sign In

Like Sidom said earlier, while the car won't start, you need to check fuel pressure with a guage, check spark at plugs with a spark tester, check injector pulse with a noid light. Even though a fuel pump makes noise, it doesn't mean it's putting out the right fuel pressure or volume. These tests are standard in the industry for all no-starts that crank over fine.

Steve


gatliff
User

Dec 26, 2009, 8:20 PM

Post #5 of 7 (3039 views)
post icon Re: No warm start Sign In

What can I do at home ? let start with spark let say it has spark when cold but not when warm what would I look for ? I can check and see if it has spark but I has a feelingit not. what can be check with a VOM ? is there anything I could have done when adjusting the idle ? there just no way to take to a shop. I think it be somthing simple but need a starting point.


(This post was edited by gatliff on Dec 27, 2009, 6:51 AM)


steve01832
Veteran
steve01832 profile image

Dec 26, 2009, 8:28 PM

Post #6 of 7 (3034 views)
Re: No warm start Sign In

We need to know what system(s) are affected. If you have fuel pressure, injector pulse, and no spark, you would check the ignition circuit. Ignition module, coil, cap, rotor, plug wires, etc...
If you have fuel pressure, no injector pulse, and no spark, you would suspect a tach signal problem. Now, we would look at a pickup, or a crank sensor.
Depending on what you have and don't have determines what "diagnostic road" to go down. If all of the systems are not checked, the odds of misdiagnosis is high. This is when the wrong parts get installed causing a lot of wasted time and money.

Steve


Sidom
Veteran / Moderator
Sidom profile image

Dec 26, 2009, 11:02 PM

Post #7 of 7 (3024 views)
Re: No warm start Sign In


In Reply To
The car would start and run fine it would idle to fast play with that and got the idle down

I have to admit I missed that statement the 1st time around. This idle system is computer controlled and there is no adjustments you can make to it. It takes some special tools to even check the system. . . . Other than some basic stuff I don't get to deep into these systems just due the the equipment requirements to work on them. . . . . I'm not sure what you did to change the idle on this, but the best advise I can give you is try to undo what you did, only if you are positive you can get it back to the way it was and go from there.






  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap