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Forum: Tech Help

12-01-2017, 07:55 PM

Replies: 17

M103 300E hot drooping idle; cold OK

Views: 2,261

Posted By BnObob

EHA checks ca 19 ohms. And voltage on pins. ...

EHA checks ca 19 ohms. And voltage on pins. Need to check the current.

Any idea how to test the OVR relay? Like the zener diode in it?
Or just call it a replace and eat the cost?

I did pull...

Forum: Tech Help

11-21-2017, 07:41 PM

Replies: 17

M103 300E hot drooping idle; cold OK

Views: 2,261

Posted By BnObob

I replaced the 2-wire T-stat today. Will test...

I replaced the 2-wire T-stat today. Will test run Wednesday.
I did check the air flow meter. Pins 1-2 read 5K....15K...10k (at max depression of plate.
But the ohmmeter needle jumped around, like...

Forum: Tech Help

11-20-2017, 07:23 PM

Replies: 17

M103 300E hot drooping idle; cold OK

Views: 2,261

Posted By BnObob

Oops my bad. I used the word "vacuum"; meant...

Oops my bad. I used the word "vacuum"; meant crankcase/valve cover vacuum as it is pulled by the throttle body into the air intake/filter. And that is pulled from the FPR via that tiny 'picollo'...

Forum: Tech Help

11-19-2017, 07:34 PM

Replies: 17

M103 300E hot drooping idle; cold OK

Views: 2,261

Posted By BnObob

Thanks everyone! I had considered the 2 fuel...

Thanks everyone! I had considered the 2 fuel pumps. Did change the check valves about 5 years ago. So, pull on wire to one pump. If nothing changes, then the other pump OK. Then reconnect & try...

Forum: Tech Help

11-18-2017, 07:50 PM

Replies: 17

M103 300E hot drooping idle; cold OK

Views: 2,261

Posted By BnObob

M103 300E hot drooping idle; cold OK

OK, I have read many of the M103 posts on 'rough idle'. And done many tests or inspected components. Problem: Cold start OK. Idle at 800 rpm. Then engine heats up to 80C. Then I drive, back off...

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