major problems

[budget300zx]

So I had about given up on my z thinking it had rod knock, but today i decided i would take a good look and use a solid rod to isolate the noise since it still had plenty of oil pressure still. I had to pull the intake piping off and unplug the maf to get it to idle since it was only trying to idle at 200rpm.

now ive narrowed down the noise to the drivers head and now some noise from the passenger head as well i didnt notice before. It has quieted down probably due to a warmer day BUT>>>>

my new problem is the passenger side exhaust is literally sucking in air does not have any blow out. i can stick a full bottle of brake fluid in my tail pipe and it will hold the bottle in place. The header remains cold and it doesn't seem that any of the passenger side cylinders are firing.


anyone have any advice on how to proceed? I did solder new injector harnesses and clean all the connectors the same day this all happened and have checked all connections again.


also have done the smoke vacuum leak test prior to removing the intake piping and had no leaks

[z.Leinbach]

Have you done a compression leak down? Maybe dead coils? Maybe a cracked header??

[budget300zx]

no compression test yet, i need to rent a tester tmrw or monday for that. i honestly just don't know how my exhaust could go into suction mode full time. i know generally if there is some suction and then exhaust it could possibly be burnt cracked or bent valves, but thats not quite the case here. i may try an upload a video in a few mins

[nissanfreak12]

Your timing could be off, like you jumped the timing belt. Its very possible that one side is acting like a large vacuum instead of a pump and it is only affecting one side versus both. If it is sucking like you said

Are you still running the stock exhaust?

Make sure the CAs and PTU are plugged in all the way.

[budget300zx]

im running a custom dual exhaust each side is independent.

i know the CAS is plugged in properly but i will actually go check the PTU right now its out of sight so i did not think to check it.

the timing jumping would make sense but i have all new timing components including tension-er with about 500 miles.

[z.Leinbach]

The tensioner could of failed. But wouldn't there be pinging if there was a timing jump

[budget300zx]

video of my problem

http://vid55.photobucket.com/albums/g12 ... 155838.mp4


also ptu wiring is secure still

[nissanfreak12]

You definitely need to check the timing. Your exhaust valves are opening up at the wrong time creating a suction. The timing components could be new, that doesn't mean anything. I have seen bets break leaving the parking lot of a shop, bearings fail on start-up, etc. There will only be pinging if it was still creating combustion. Pinging is pre-detonation, is there is no detonation, nothing to ping and if the fuel is leaving the cylinders before it can detonate, well you get it.

Unless by an odd coincidence all the injectors failed on 1,3,5, you have a serious timing issue or a head problem. Still a head gasket normally blows between cylinders, not the whole side. I honestly have no idea how that engine is running though

[z.Leinbach]

Lol sounds like a 13b. But that is the weirdest thing I've ever seen an engine do

[budget300zx]

Well the engine had some kind of catastrophic failure. The cold engine compression test revealed divers side 150, 150, 150 pasenger side 0, 0, 0 (all in psi). gauge was from orileys. I lined up the timing marks by pulling the cover back slightly and the marks looked to be spot on. I'll double check this tmrw in better light.

[z.Leinbach]

Could be stuck valves, rings completely gone, or combination of both

[nissanfreak12]

Don't rely on the marks, count the cogs on the timing belt. Make sure the cams are rotating with the engine. Valves very rarely get stuck on ohc engines, unless they are bent to hell.

[budget300zx]

Well I pulled the upper plenum and looked down the runners and sure enough every intake valve is not anywhere near the seat. Everything timing related checks out still, and I definitely do not have a broken cam or broken cam gear pin as the cams still move with the turn of the engine. Not sure what happened to cause this, but I do know I will need new heads, bolts, and gaskets for a bare minimum Repair.

Has anyone else has ever experienced this?

[budget300zx]

I continued toying with the car and found that the intake cam did not move with the gear when introducing starter torque. By hand it continued to move. So I'm concluding the pin snapped, killed the 3 passenger cylinders which in turn created the knocking due to the extreme load put onto the drivers side during warm up.