just replaced my m42. issues! can anybody lend me some advice?

[grantlacey11]

So i just replaced my m42, with another m42. got everything bolted in and what not, but there are some wierd things that happen when i turn the key.

it kind of sounds...and feels like the spark plug wires have been mixed up, but there might be a bigger issue.

she fires and starts up, but backfires and fires herself out of rotation quite suddenly and dies. she runs really rough for about a second and then dies.

any ideas?

thanks!!

Grant

[KenC]

Either the timing of the cams is off or your spark plug wires are out of order.

[grantlacey11]

well. i figured it out. the missing part is: hydraulic timing chain tensioner. how bad is that!?!?

[Vethen]

Well, im guessing that is something you need to go find :)

[KenC]

If it was backfiring that much and stuttering, I'm guessing you'll need to pull your head and check the valves.

[grantlacey11]

correct! probably will pick it up tomorrow and that will sove the starting up problems!

[KenC]

If you're missing the chain tensioner and it was running like that and dying, your valves are toasted. You're past the point of needing a tensioner.

[grantlacey11]

hmmmm. thats NOT good.

[KenC]

hmmmm. thats NOT good.

pull the head and inspect itbefore you crank it again.

[3bvert]

toast
maybe between the 2 you can build a good one, if you still have the other motor

[Hick]

throw a tensinon there in it an see what it does. you cant hurt the valves any more

[grantlacey11]

yeah so i got the tensioner,,,she runs, wayyy better than she did before. idle is rough...but still pretty rocky. i was messing around with the spark plugs and pulled plugs 3&4 out just to see what would happen...nothing changed...so apparently its not firing on cylinder 3&4? what the hell does this mean?? could it be as simple as the spark plugs are shot?

[StereoInstaller1]

Or your valves are bent...

Do a compression test

[KenC]

Your valves are bent. No seal = no compression.

[Hick]

heres what the M42 does when the tensioner lets the chain jump teeth...