6.2 mpi timing issue mercruiser om670840

[MikDee]

That's not running on all 8 cylinders! I've heard tractors that sound better then that! :facepalm: Put the keys down, move away from the ignition, and fix that engine first! :nono:
If the firing order checks out ok, check for spark on each spark plug with a cheap spark tester. Then check your plugs for fouling, or anything unusual? Personally if all else checks out OK, I think your valves maybe adjusted wrong, check that out also.

 

[henry1357]

thanks mike dee thought id adjust the valves as you said

if the video uploads please have a listen

regards henry

 

[henry1357]

if you go to other videos on my youtube channel you can see it can't seem to upload here

 

[henry1357]

thanks mike dee thought id adjust the valves as you said

if the video uploads please have a listen

regards henry

 

[henry1357]

can't upload vid

go to my other vid and find it from there if you want to listen after i have adjusted valves
i think its sorted now

 

[MikDee]

Can't get to the video's? Blank reply on this end? I know I saw the original video before!,,, but even that's not coming up now???

 

[MikDee]

Were the valves out of adjustment? If so, do you think you got it right now?

 

[henry1357]

yes i think so have a listen if it uploads

 

[MikDee]

yes i think so have a listen if it uploads

It sounds much Better to me! Now, that it's running better, recheck your timing,,, Good Luck heading out for the day, I maybe back on later tonight?

 

[achris]

Sounds right now... Don't bother checking the timing, you can't adjust it anyway.. If you can afford the coin, invest in the Diacom software for a laptop.. I have it, and it's worth it's weight in the shiny yellow stuff....

Chris.......

 

[henry1357]

hi guys
it sounds so much better now thanks for all your advice, hopefully i am somewhere near right now.

i have ordered the mercruiser scan tool as advised by rinda guy, he said it would be better for the single user as i can monitor the engine while out

 

[MikDee]

The next thing to do, is check to see if any damage was done as the engine was run without a proper valve adjustment? If the valves were too tight, they might hang open when running, causing loss of compression, & possible engine damage. You should do a compression test now to see what they read, and check or replace any questionable spark plugs.

 

[MikDee]

So, what's new Henry? I hope you sealed the valve covers good, I burnt out an engine after setting solid lifters on one of my cars, I drove it to the city, & back, only to find I had a small oil leak afterward, it was too late then :blue: