seems like its going to SLOW

[jjhjrcmh]

Good afternoon everyone. I am having a problem and i'm getting close to cussing. I wrote earlier about a fuel problem and got good answers. I cut the pick up tube off so about an inch above bottom i relocated the pump ball and it all seems to be better and actually boat got a little more rpms so that great. New problem is pump ball does not go flat and fuel is flowing no air bubbles but I will be going along and then it drops to 3500rpms and all the sudden jump back up then down and remain down. When I get back to the house and check all coils are firing and spark is good. I tried turning off wait a bit and turning back on hoping to clear SLOW to know avail. Compression is good 90+/-2 on all 6 cylinders. I thought just to change coils that possibly after running they may short out. I checked temp and its really good. I was having a fuel problem earlier and with the advise I got that part cleared up. Any Ideas. Motor is E200TXECM 1998.

I am open to all ideas.
Thanks for all the help. More information if needs

 

[1946Zephyr]

Re: seems like its going to SLOW

How is the fuel pump? Is it pumping to full potential?

 

[jjhjrcmh]

Re: seems like its going to SLOW

I was just thinking about fuel pump. I tested after reading your response and I will pressure test tomorrow but I did test a couple I have in garage and found 2 that work properly. Before changing though I will test. Yeah I have a couple orso of fuel pumps pick them up when I can for 30dollars or less. Gonna order some rebuilds this week. thanks for something to look at

 

[hidef]

Re: seems like its going to SLOW

When the RPMs drop if you squeeze the primer bulb and the RPMs pickup that will indicate an issue with the fuel pump. I would also check all of your electrical connections, a loose connection or one of the kill wires grounding out can also cause intermittent behavior that you describe.

 

[jjhjrcmh]

Re: seems like its going to SLOW

Bulb this time stayed pretty solid and when you could it made no change. Thanks. Did remove the coils and foun #3 and # 5 coil with the insulation on bottom cracked. Thinking as it heats up think that these 2 coils are grounding out.

 

[jjhjrcmh]

Re: seems like its going to SLOW

replaced the 3 coils and spark plug wires took it out yesderday and wow 4900rpms and ran 35 mph. thanks to all