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Forum: General Q & A

08-14-2020, 11:39 AM

Replies: 10

Water in oil after rebuild

Views: 2,300

Posted By snowman51789

Water in oil after rebuild

I have a 98 454 mag mpi gen 6 motor that i had rebuilt in june. The motor har about 650 hours and they did a full rebulid. I got the motor back, installed it myself and i was taking it out a couple...

Forum: General Q & A

06-28-2020, 10:04 AM

Replies: 1

Knock Sensor

Views: 773

Posted By snowman51789

Knock Sensor

i have a 98 454 mag mpi Gen 6 Serial #0L014516. i have been chasing a few issues over the past year, steam coming out of 1 exhaust and running rich at idle. i have a ridna scanner and every time i...

Forum: General Q & A

08-26-2019, 10:34 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

I had a bad experience one time while I was...

I had a bad experience one time while I was trying to shut off a snowmobile that started dieseling, it was late at night but that shock gave me the energy to power on for another couple hours until I...

Forum: General Q & A

08-26-2019, 06:40 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

im starting to lean towards replacing the IAC...

im starting to lean towards replacing the IAC also since everything else seems to be checking out fine. I think im going to remove it, clean it and try it and if there is no change, then replace it....

Forum: General Q & A

08-26-2019, 06:21 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

Yes you were, dose the needle bouncing indicate...

Yes you were, dose the needle bouncing indicate an issue with the fuel pressure? I guess I assumed it was from the vibration of the motor and it was normal, but that is the first time ive ever had to...

Forum: General Q & A

08-25-2019, 08:00 PM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

i was able to get the boat out today and run it...

i was able to get the boat out today and run it (on muffs). I did not notice a difference pulling the spark plug boots off one at a time. I did shut it off and re-start it.

I installed all new...

Forum: General Q & A

08-25-2019, 06:10 PM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

ok I see what your getting at. how much should...

ok I see what your getting at. how much should the timing be changing under normal condition's (ever second or couple seconds?) I will pull them individually next time I pull it out of my garage,...

Forum: General Q & A

08-24-2019, 11:26 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

I did not try unplugging the spark plugs to see...

I did not try unplugging the spark plugs to see if it stumbles but I did plug a spark plug light in-line and all checked out good.

a few months ago when this issue first started, my neighbor...

Forum: General Q & A

08-24-2019, 11:10 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

It is cool fuel. When I was researching, I found...

It is cool fuel. When I was researching, I found some posts describing symptoms of of a bad VST (I didn't know what a VST was) I got real excited. Then i researched what a vst was and realized I...

Forum: General Q & A

08-23-2019, 08:24 PM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

The compression readings were between 150 and...

The compression readings were between 150 and 160, (that made me happy). The timing numbers are constantly changing but not by very much, I believe that's because the 454 mag mpi some how use timing...

Forum: General Q & A

08-23-2019, 10:40 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

https://cimg0.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg0.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/980x2000/20190822_192509_a77453bbaf4013983a298974dcb691779a88f49a.jpg

Engine running

...

Forum: General Q & A

08-23-2019, 10:37 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1156/20190821_180102_36ec0f8d727629fbe3b11983eeb57f019ff2a6be.jpg...

Forum: General Q & A

08-23-2019, 10:18 AM

Replies: 25

Engine loading up at idle MPI

Views: 8,681

Posted By snowman51789

Engine loading up at idle MPI

I have a 257 mirage with a 98 454 mag MPI GEN 6. it runs great except for at idle. when its been idling the motor acts like it is loading up on fuel. it will run good at idle for about 3 mins or so...

Forum: General Q & A

06-17-2018, 04:27 PM

Replies: 7

Getting water in boat

Views: 925

Posted By snowman51789

I suppose if the hoses are below the water line,...

I suppose if the hoses are below the water line, there is nothing to stop the water from coming in. I think I answered my own question. Haha. Heading out to do some more investigating.

Forum: General Q & A

06-17-2018, 04:24 PM

Replies: 7

Getting water in boat

Views: 925

Posted By snowman51789

I did wounder if one of the engine hoses...

I did wounder if one of the engine hoses could be an issue. I both times that I saw the bilge pump kick on, we had been anchored for 30+ minutes. If I had an issue with one pic the engine hoses,...

Forum: General Q & A

06-17-2018, 12:39 PM

Replies: 7

Getting water in boat

Views: 925

Posted By snowman51789

Getting water in boat

98 mirage 454 mag mpi with a bravo 1 outdrive
Yesterday I pulled my out drive off to inspect my u-joints and bellows. Everything was normal so I re installed the drive with a new seal kit and went...

Forum: General Q & A

05-02-2018, 08:53 AM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

I replaced the IAC valve with the part number...

I replaced the IAC valve with the part number that 92 suggested and everything is working great.

I will save the info for testing the TPS incase I need out in the future. Thanks

I may have...

Forum: General Q & A

05-01-2018, 07:23 AM

Replies: 16

502 MPI Idle Issue...

Views: 8,477

Posted By snowman51789

+1

+1

Forum: General Q & A

05-01-2018, 06:04 AM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

Thanks for the alternative part numbers. I did...

Thanks for the alternative part numbers. I did the "check" for the IAC that is called out in the merc manual and I determined that the IAC is bad.

My neighbor is a very good auto mechanic and he...

Forum: General Q & A

04-29-2018, 07:05 PM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

the serial number is 0l014516. the number for the...

the serial number is 0l014516. the number for the IAC is 805224A 1

Forum: General Q & A

04-29-2018, 04:42 PM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

from looking at exploded views. it appears that...

from looking at exploded views. it appears that the IAC is in the throttle body. yes the plug is difficult to get to. if im unable to get to the plug, could I just remove the throttle body and unplug...

Forum: General Q & A

04-29-2018, 04:24 PM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

I put a new cap, rotor, spark plugs and spark...

I put a new cap, rotor, spark plugs and spark plug wires on it. everything looked good but it was time for all of that to be replaced anyway. I am going out right now to change the fuel water filter....

Forum: General Q & A

04-27-2018, 08:50 PM

Replies: 19

454 mpi hard cold start

Views: 9,416

Posted By snowman51789

454 mpi hard cold start

I have a 26 ft mirage with a 98 gen 6 454 mag mpi. Ive had the boat out about 5 times this year and it ran great. But the last time I had it out, it had a hard time starting (cold start) I had to...

Forum: General Q & A

04-11-2018, 11:18 AM

Replies: 2

fuel line/rail leak

Views: 520

Posted By snowman51789

Haha. It's definitely the were the fuel line...

Haha. It's definitely the were the fuel line enters the fuel rail. I couldn't get any o-rings I had in my kit to work.

I ended up using a valve seal, it sealed up perfect. I'm not thrilled with...

Forum: General Q & A

04-10-2018, 06:18 PM

Replies: 2

fuel line/rail leak

Views: 520

Posted By snowman51789

fuel line/rail leak

im putting my 98 454 gen 6 mpi mag back together after having the heads rebuilt. I have a fuel leak were the fuel line goes into the fuel rail. I lost the original O-ring so I put a normal 1/2" o...

Showing results 1 to 25 of 31