Loud poping noise in engine

[tqmx1]

And by the way the FJ of any type NEVER had a CROSS PLANE CRANK!!!

Man You bot HOOK LINE AND SINKER

[SlowOldGuy]

Let me pile on here.

Yes, your coils are wired just fine.  Don't rewire your coils, just swap the spark plug wires between cylinders #2 and #4.

DavidR.

[Ralph]

 :dash2:You can lead a horse to drink but you can't make him water I have found after 65 years.

[Harvy]

.....wire it back up as the group has suggested left coil 1-4 right 2-3 or do it your way as you have the only fj on the planet with this weirdo wiring, and do the test. I would recommend new spark plugs to be sure they are good.

Irish, listen to Mark. Try it.  What do you have to lose?
However, if you do HAPPEN to have a rare crossplane crank Yamaha motor, you could do some serious damage to the valves if you followed Mark's advice....

OK, I'm going to take a wild guess here on the popping sound.
The plug wires are wrong and when you cranked it over there was an air/fuel in the cylinders that sparked out of time.....you heard this as the popping sound.........now its cleared the cylinders and you don't hear it any more.

You DO NOT have a cross plane engine, just mixed up plug wires. If it was a cross plane engine, the lobes on the cams would be phased differently too.

Take the plugs out and turn the engine over by hand........ you will find that pistons 1 and 4 are at the top at the same time, then 2 and 3 will rise together and 1 & 4 will descend. Just stick a screwdriver down the plug holes to confirm this.....its easy. BUT don't let the screwdriver bind on the plug threads or cock sideways or you'll break something.

Now that you have found that you do have a standard FJ engine, put the plugs back and wire them correctly.

Is the bolt on the end of the crank tight and are the screws that holds the ignition module tight? May be your ignition timing has slipped. You have check that you are getting a spark - correct?

These engines are not different to car engines mechanically, just electrically. A straight 6 car engine is usually 1-5-3-6-2-4, with pistons 1 & 6, 5 &2, and 3 & 4 working as pairs, one of the pair on the compression stroke and the other on the exhaust stroke. Same on the FJ - 1 @ 4 paired and 2 & 3 paired. The only difference is that a car will have a distributor and only fires 1 plug at a time, while the FJ fires 2 plugs at the same time - one plug for the cylinder on the compression stroke and the other plug for the cylinder on the exhaust stroke........ its called a lost spark ignition system.

Happy Easter everyone!

Harvy

[RichBaker]

look man I'm telling you my left coil is on cylinder 1 and 2 and my right on is on 3 and 4 and it ran perfectly fine, I know how cylinders fire. why the hell would i make that up. I'm trying to take back as much advice as I can get but when yea don't listen to how I know my bike is set-up then nothing gets accomplished here. Hell i can even plug the wires back up and start it and send you a picture and video, would that prove my point to yea that i know what I'm talking about

So your FJ is totally different from every other FJ out there?  Get a clue and quit arguing.....   

[andyb]

I know there's FJ's out there with crossplane cranks.  In fact, they occasionally develop multi-piece crossplane cranks.

And around the same time, they develop big jagged lightening holes in the cases, and proceed to not run very well afterwards.  New cases, crank, rods, pistons, and heads are often required to retune them to a running condition.   

[weymouth399]

I've had a few of those kinds of motors before, I didn't realize that they were so rare. 
I can show you pics of where a lot of them go to rest, it's a sad sight.
They ooze dollar bills out for a LONG time.

Bob W

[Harvy]

I know there's FJ's out there with crossplane cranks.  In fact, they occasionally develop multi-piece crossplane cranks.

And around the same time, they develop big jagged lightening holes in the cases, and proceed to not run very well afterwards.  New cases, crank, rods, pistons, and heads are often required to retune them to a running condition.   

Andy....... I've got one of them....its not an FJ, its a 2.5 diesel - and its buried under the concrete floor of my garage.......

Harvy

[Dan Filetti]

You said:

look man I'm telling you my left coil is on cylinder 1 and 2 and my right on is on 3 and 4 and it ran perfectly fine, I know how cylinders fire. why the hell would i make that up. I'm trying to take back as much advice as I can get but when yea don't listen to how I know my bike is set-up then nothing gets accomplished here. Hell i can even plug the wires back up and start it and send you a picture and video, would that prove my point to yea that i know what I'm talking about

and you also said:

...my coils are set up as 1 and 2 for the left and the right one is 3 and 4 and it ran perfectly fine before I tore it apart, I rode it for a week with no problems, no gas problems no popping problems nothing.

Hooked it all back up how it was when tore apart, started just fine, but after couple minutes shut off, switched plug wires, tried to start and it popped and now wont start....

So, if you're so damn SURE it ran FINE with 1-2-3-4 wiring... wait for it... then why did you, by your own admission "switched plug wires"??!!  Maybe, just maybe, because you were not sure?

Dude, I'm not really one for piling on or flaming but you are just sooo out of line it's not even funny.  You're asking for help, in the most belligerent way I've seen in quite a while.  Worse, you are not even listening to the good advice you're being given.

There are lots of forums out there that roll like that, all ignorant and rude, maybe that's where you should go?

Just a thought,

Dan

[Dan Filetti]

...my coils are set up as 1 and 2 for the left and the right one is 3 and 4 and it ran perfectly fine before I tore it apart, I rode it for a week with no problems, no gas problems no popping problems nothing.

If it "ran perfectly fine" then why did you "[tear] it apart"

This sure seems like you're contradicting yourself [again].

Marsh, are you SURE this is not actually Klavdy?

Dan

[rktmanfj]

       


Too much popcorn!         


Randy T
Indy

[weymouth399]

look i wire it ur guys way and see what happens and let ya all know tonight around 8
[/quote]

What time is it , is it 8 yet

[irishluck]

...my coils are set up as 1 and 2 for the left and the right one is 3 and 4 and it ran perfectly fine before I tore it apart, I rode it for a week with no problems, no gas problems no popping problems nothing.

If it "ran perfectly fine" then why did you "[tear] it apart"

This sure seems like you're contradicting yourself [again].

Marsh, are you SURE this is not actually Klavdy?

Dan

as stated before dan, i tore it apart to replace bearing and seals, i never tore the engine part. read.

.....wire it back up as the group has suggested left coil 1-4 right 2-3 or do it your way as you have the only fj on the planet with this weirdo wiring, and do the test. I would recommend new spark plugs to be sure they are good.

Irish, listen to Mark. Try it.  What do you have to lose?
However, if you do HAPPEN to have a rare crossplane crank Yamaha motor, you could do some serious damage to the valves if you followed Mark's advice....

OK, I'm going to take a wild guess here on the popping sound.
The plug wires are wrong and when you cranked it over there was an air/fuel in the cylinders that sparked out of time.....you heard this as the popping sound.........now its cleared the cylinders and you don't hear it any more.

You DO NOT have a cross plane engine, just mixed up plug wires. If it was a cross plane engine, the lobes on the cams would be phased differently too.

Take the plugs out and turn the engine over by hand........ you will find that pistons 1 and 4 are at the top at the same time, then 2 and 3 will rise together and 1 & 4 will descend. Just stick a screwdriver down the plug holes to confirm this.....its easy. BUT don't let the screwdriver bind on the plug threads or cock sideways or you'll break something.

Now that you have found that you do have a standard FJ engine, put the plugs back and wire them correctly.

Is the bolt on the end of the crank tight and are the screws that holds the ignition module tight? May be your ignition timing has slipped. You have check that you are getting a spark - correct?

These engines are not different to car engines mechanically, just electrically. A straight 6 car engine is usually 1-5-3-6-2-4, with pistons 1 & 6, 5 &2, and 3 & 4 working as pairs, one of the pair on the compression stroke and the other on the exhaust stroke. Same on the FJ - 1 @ 4 paired and 2 & 3 paired. The only difference is that a car will have a distributor and only fires 1 plug at a time, while the FJ fires 2 plugs at the same time - one plug for the cylinder on the compression stroke and the other plug for the cylinder on the exhaust stroke........ its called a lost spark ignition system.

Happy Easter everyone!

Harvy

i never said i had a crossplane, someone else stated i did so i said ok then i have one.

look man I'm telling you my left coil is on cylinder 1 and 2 and my right on is on 3 and 4 and it ran perfectly fine, I know how cylinders fire. why the hell would i make that up. I'm trying to take back as much advice as I can get but when yea don't listen to how I know my bike is set-up then nothing gets accomplished here. Hell i can even plug the wires back up and start it and send you a picture and video, would that prove my point to yea that i know what I'm talking about

So your FJ is totally different from every other FJ out there?  Get a clue and quit arguing.....  

yes rich, my Fj is SOOOO different cause thats exactly what i stated,  you get a clue

And by the way the FJ of any type NEVER had a CROSS PLANE CRANK!!!

Man You bot HOOK LINE AND SINKER

well sounds a little differnt than what others are saying

[racerman_27410]

i smell troll ....... the OP is way more interested in arguing than in repairing a motorcycle.


time to nip it.

[irishluck]

well just for your info, i already have the whole bike switched over to the 91 and running, so its already repaired mr racer