User Tag List
Thanks: 0
Likes: 0
Results 1 to 2 of 2
-
08-13-2020, 08:37 PM #1
Trying to help a buddy {{2.5 EFI 200 Miss Firing and Rough Running Until !!!!!!}}
He says boat runs rough seems to be midd firing until he hits the trim then it wakes up. Almost seems like a drop in voltage makes it run right. Almost totally opposite from what I've ever experienced. I've seen them run fine until voltage drop THEN run rough (Like weak battery and insufficient charging)
Anybody else experienced anything of sorts?
Thanks
100+mph in 800' STV River Rocket w/modified 260 SOLD
100+mph GPS'd TRIAD V-21 w/stock 2.5 260 SS (85mph wid da 200EFI so far!!!!!) SOLD
22' SmokerCraft Deck Boat wid a 200EFI(not GPS'd Yet)
ALLISON XB2002-Gotta rig it now
-
08-14-2020, 07:15 PM #25000 RPM
- Join Date
- Feb 2013
- Location
- Northern Cal
- Posts
- 190
- Thanks (Given)
- 0
- Thanks (Received)
- 18
- Likes (Given)
- 8
- Likes (Received)
- 37
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
He should monitor the battery voltage with the engine running then hit the trim in both directions and look at the effect on the battery voltage . Could be a bad diode in the rectifier circuit is letting the AC current through causing noisy DC to the ECU wreaking havoc with the injection system . If you have a good multimeter that is capable of reading DC volts / hertz you can spot a bad diode (or with a fully charged battery you can disconnect and tape the rectifier wires , run the engine and see if the problem stops ). Perhaps the additional load from the trim motor is lessoning any noise ? Another possibility is a poor connection some where in the harness wiring is coming thru the trim wiring when energized forming a sneak circuit coming around the bad connection ?
Last edited by H2Okie; 08-15-2020 at 10:59 AM.
Similar Threads
-
OMC Tech: 3.0 running rough at idle
By Gorilla0178 in forum Technical DiscussionReplies: 18Last Post: 01-14-2019, 06:29 PM -
Mercury Tech: Merc 200 XRi Rough Idle/Miss after new powerhead
By eswilderson in forum Technical DiscussionReplies: 7Last Post: 01-09-2018, 11:26 PM -
rough idle/miss, help me diagnose it please.
By simplyorange in forum Technical DiscussionReplies: 2Last Post: 09-05-2012, 03:17 PM -
2004 Evinrude 225HO D.I. - Running rough, miss...
By mride460 in forum Four Stroke and Direct Injected Two Stroke EnginesReplies: 4Last Post: 06-06-2012, 02:25 AM -
Miss firing
By boatracer36 in forum Technical DiscussionReplies: 2Last Post: 05-07-2010, 12:19 AM