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2008 Mercury 90 EFI - intermittent loss of power but then runs great
swist	#21  Posted on 09/17/13 - 9:28 AM
Member Posts: 38 Comments: 0 Joined: 09/04/13	So it does the same thing as if you suddenly pulled back the throttle (puts engine at idle) and the suddenly advance it back to where you had it. Have you looked into the electrical parts of the throttle linkage - throttle position sensor, or whereever the throttle input goes into the EFI system. Even if that's not it, I still like electrical - too sudden for fuel system, I think. Loose wire somewhere, maybe even a bad ECU (intermittent connection on a printed circuit board)
oldnstoked	#22  Posted on 09/28/13 - 2:23 PM
Member Posts: 16 Comments: 0 Joined: 08/31/13	Have similar problem. I'm installing a primer bulb. I believe that the fuel lift pump is bad. I will let you know how it works out. Don't know why there wasn't a primmer bulb.It was explained to me if there isn't any fuel like from running out of gas or bad hose connection that the lift pump an wear out by lack of cooling and lubrication.
waco72	#23  Posted on 09/29/13 - 7:03 AM
Member Posts: 42 Comments: 0 Joined: 10/25/08	Hi Oldnstoked, Does yours do this all the time or just within the first few minutes of operation? Thanks for the info, let me know.
oldnstoked	#24  Posted on 09/29/13 - 10:57 AM
Member Posts: 16 Comments: 0 Joined: 08/31/13	waco72 wrote: Hi Oldnstoked, Does yours do this all the time or just within the first few minutes of operation? Thanks for the info, let me know. Hey Waco72 Mine just started a couple of days ago. Ran fine at cruising speed. Went o fishing spot. Anchored for 1/2 hour. Started to leave and it acted up at idle. Heard a blower sound coming from fuel module. After trying to start it and changing tanks it cleared up. Coming in I have a 10 minute 5mph zone it started again. Thought it might be my bad tach sending a signal so I disconnected it and notice the foam on the air filter was 1/3 missing so I cleared the rest of the foam off. Started the engine and it ran fine at idle for a while. went for a cruise and it started acting up again. Called my mechanic. Put a diagnostic computer on it and nothing came up. Installed a primer bulb and went for a cruise and didn't act up. My luck when the mechanic is there it wont act up. He's thinking that the lift pump might be or is going bad. Installing the primer bulb so if it is bad I wont get stuck
oldnstoked	#25  Posted on 09/29/13 - 3:26 PM
Member Posts: 16 Comments: 0 Joined: 08/31/13	Update Installed primmer bulb and new connector. Ran it without an issue until I stopped to talk to a friend for about 20 minutes. When I restarted an issue developed. Was idling rough and was stating to stall. Pumped the primmer bulb and issue disappeared. My mechanic is going to change the lift pump and I will keep you posted.
waco72	#26  Posted on 09/30/13 - 3:07 AM
Member Posts: 42 Comments: 0 Joined: 10/25/08	Thanks, My engine also sucked in a 2 pieces of my air filter last year, the alarm went off and it bogged down for a second. I replaced air filter and was fine after that. There have been other threads about it happening to others as well. Edited by waco72 on 09/30/13 - 3:07 AM
oldnstoked	#27  Posted on 09/30/13 - 3:58 AM
Member Posts: 16 Comments: 0 Joined: 08/31/13	waco72 wrote: Thanks, My engine also sucked in a 2 pieces of my air filter last year, the alarm went off and it bogged down for a second. I replaced air filter and was fine after that. There have been other threads about it happening to others as well. Why do you think it happens? Also why didn't it happen again?
waco72	#28  Posted on 09/30/13 - 12:06 PM
Member Posts: 42 Comments: 0 Joined: 10/25/08	I was told that it happens when the filter breaks down. It seemed mine became very tacky to the touch and pulled apart easily when it happened. I researched it and found out it was not that uncommon. I will just keep an eye on it now and replace it every few years. This one was 4 years old when it happened it it was two perfectly circular holes in the filter material on each side about the size of the intake. Do a search on this site and you will find others that have had the same issue
oldnstoked	#29  Posted on 09/30/13 - 6:47 PM
Member Posts: 16 Comments: 0 Joined: 08/31/13	Every few years? The one on my engine fell apart with only 90 hours on it.
oldnstoked	#30  Posted on 10/06/13 - 5:45 AM
Member Posts: 16 Comments: 0 Joined: 08/31/13	Update Changed lift pimp and still had problem. Test and found a faulty float. Changed it and will test it. Took it out for 1/2 hour run and seems to be ok. Oldy
waco72	#31  Posted on 10/06/13 - 6:59 AM
Member Posts: 42 Comments: 0 Joined: 10/25/08	oldnstoked wrote: Update Changed lift pimp and still had problem. Test and found a faulty float. Changed it and will test it. Took it out for 1/2 hour run and seems to be ok. Oldy Great thank you, after all of the replies and things I have tried the problem seems to be getting narrowed down to just a few things. What kind of test did they do and was it an expensive job? In mine it almost seems like some type of float is getting stuck and then once it releases it is fine for few days. I appreciate the input
oldnstoked	#32  Posted on 10/06/13 - 7:53 AM
Member Posts: 16 Comments: 0 Joined: 08/31/13	The parts were about 400.00. If your doing the float you should do the lift pump. The bad float might have burnt out the lift pump. I did air filter and installed a primer bulb and a new connection to tank too. I need to put some hours on it but I think I addressed the problem.