air boxed replaced and developed a major missed but solved.

[47silver]

Hmmm:

The old air box gave up the ghost, so i replaced it.
Major miss in the car, could not tune it properly.
Checked pressures, adjusted timing, replaced spark plugs (2 times), installled new spark plug wires (beru with stainless very nice), adjusted point gap, adjusted the mixture to 2% but still missing and backfiring untill the engine went to 3000 and ran ok not great but ok.

At wits end, I read a thread here about a pop-off valve not sealing, the one I bought had one installed and the glue looked old so i pried it off.

Damn,, that was dumb I thought as i had to put it into the garage so I decided to put the pop-off valve in and sealed it with a new zip lock sandwich bag the kind that seal with pressure.

Started the car and the heard a back fire and the pop-off valve blew out.

I could not find the baggy though, but at the time i did not give it any thought.

#4 cylinder was always colder than the other cylinders so just for fun, I pulled the injector from #4 and looked down with a flashlight. and what did i see? The picture is not actual we put the baggy in to show how it sat for effect.





After i felt in the injector with a long thin screw driver we pulled #4 intake manifold out and found this (my son is holding it)






Note that this baggy is not a pressure sealed type of bag and it is 4 times bigger than a sandwich bag and there is grease all over it. I cleaned everything when i had air box and runners apart to replace the air box so the grease had to be on this baggy from another project or source or before i cleaned it. So that meant that the sealed type of baggy was still in the intake of the car.

So thinking the worst case, i took all of the intake runners off but I did not find any other baggies.

Started the car after i put it together and it runs perfectly better than ever actually as all of the air leaks are completely fixed.

i dont know how it got into the intake as i used paper towels to plug the holes when i had it out. I may have dropped it into the air box somehow or it fell in when it was on the ground.

Point: Clean air box before installing, i did not even look into it, so my dumb mistake.

I did learn a lot about the CIS system though, air sensor, mixture, injector tubes, seals injectors, timing and so on..and the engine has never been cleaner and i did adjust the valves twice, . so all in all a good experience.

I really recommend that you take the CIS system off to evaluate you vacuum lines, replace the seals, gaskets, and hoses that need renewing,, but dont leave any plastic near the air box.....

[Paulporsche]

Glad to hear you found it. Does this mean the other baggie is in the engine?

[47silver]

the other bag has been found,,, but in the meantime i took the entire cis apart and searched each intake and also checked each cylinder at top dead center with a long piece of 1/4 copper tubing just to make sure..
found the bag near the lift the wind blew it into the garage.....the round marks were on it from the pop off valve...