:help Guys need some help.:help

I replaced the head gasket on my car. Everything went back on without a problem but now I'm having problems getting the car running again.

I set the timing IAW the Bentleys manual and used the required tools but I keep getting very loud pops from the engine. It almost sounds like its coming from the intake manifold. Does anyone have any ideas what these sounds could be. :eyecrazy

I checked the exaust manifold for proper fits but that wasn't it.

Thanks

check all of your fluids.if your coolant or your oil isnt the right color it could be tell tale signs of a leak but since you said you head gasket is brand new it coul be your block.the knocking could be a number of things.it could be the piston slaping on the wall due to excessive oil clearance.a bad bearing.could be a number of things depending on what kind of popping noise (metal to metal,or ticking to name a couple).

Check the firing order. If you have a wire or two swapped, it'll spit into the manifold.

Check the firing order. If you have a wire or two swapped, it'll spit into the manifold.

oooooh that too haha good call.

check all of your fluids.if your coolant or your oil isnt the right color it could be tell tale signs of a leak but since you said you head gasket is brand new it coul be your block.the knocking could be a number of things.it could be the piston slaping on the wall due to excessive oil clearance.a bad bearing.could be a number of things depending on what kind of popping noise (metal to metal,or ticking to name a couple).

Can you elaborate on the pistion slapping the wall due to excessive oil clearence.

I think the noise is being produce by combustion. It doesn't sound mechanical. My car doesn't have wires but rather ingnition coils, there's no way to mix them.

piaton slap is caused by excessive oil clearance or piston wall taper wear or bad rings.if it's bad piston rings or excessive oil clearances then you should be burning a blueish smoke out of the exhaust. the reason being that the oil is slipping past the oil rings and the combustion rings into the combustion chamber.it could also be simply that you put to much oil in the car.piston slap is the piston skirt (being the bottom of the piston , the widest part of the piston) is comming down crooked causing it to hit the cylinder wall.the bad ring theory will cause excessive blow by to go past the rings due to bad sealing and the blow by to end up in the crank case. (haha sorry if im kinda being repeatetive, im a student at a private automotive school and it's kinda how we're taught).excessive oil clearance can also be in the bearing between the crank and the block since the crank rides on a thin layer of oil. all of this shit makes your oil pump work harder to keep oil pressure up.do you have any oil consumption problems ? oil pumps are known to fail too so it could be that.just look around your car bro.im always here on these forums despite the fact that im young (21) i have an obsession with this whole car thing hahha.good luck buddy.

mine was making that noise.. knock sensors and intake manifold gaskets (including maf sensor gasket)

that's a good one too. but so far i have been lucky and not have any problems other than getting my gas mony raped so 94530 is probably right.just run process of elimination

These are backfires it happens when the intake charge ignite too early, before the intake valve is closed.
+1 on having cross coil packs wires. And it could also be cam timing beeing late or totally reversed on one bank.
Are some cylinders firing at all like a full bank ?

Im about 95% sure my MAF sensor is shot. Tried cleaning it but if I use it the engine shuts down. Could a bad MAF cause the miss fire problem??

Maybe a massive air leak, I have to admit that I dont know what the DME do when the MAF is unpluged. If you plug it and hold the throttle any luck ??

Maybe a massive air leak, I have to admit that I dont know what the DME do when the MAF is unpluged. If you plug it and hold the throttle any luck ??

im kinda new to bimmers so i dont know how the DME works but usually when you unplug a maf the air cant be monitored so the car would just shut down.is the m50 throttle by wire (off topic i know ,sorry)

He have a M60 V8, it may happen to have a idle fuel map that dont use MAF if he gets no signal, like an injector duration default value at idle. I think the MAF is a 0-5 volts signal, you should have a 5 v reference that goes to it and a return signal to the DME, maybe a few more wire like a 12 volts and a ground.
So many stupid troubles are coming out when you unplug everything specially when the car get old.
I personally have to tear my oil pan because I lost 5 times today my oil pressure, bolts are prolly laynig donw the pan.

so the DME is kinda like a normal ecu ? nothing special ?

Not really, bosh motronic 3.3 no more no less

hmmmmm.nice thanks for the info bud, im kinda new to the deutschland thing

Check the firing order. If you have a wire or two swapped, it'll spit into the manifold.
Not likely on the m60, unless he totally took his wiring harnesses apart there is no way you can mess up the firing order. Trust me.

Dunno about the M60, but I can tell you what happens when you unplug the AFM on the M30 - the car idles but sumbles really badly when you try to accelerate. A dirty MAF doesn't cause noises at constant RPM, however.

There are very, very few things that can cause early detonation to the point of it spitting into the manifold... One is a cracked valve, two is a frozen lifter keeping the valve open during the compression/ignition cycle, three is an incorrect firing order which can happen from swapping wires (not possible, I guess...) or a bad pulse from the computer, lastly - the cam(s) was/were incorrectly installed. That's about it.

Thanks for all the input. I ordered a new MAF last night:eyecrazy so hopefully that will resolve the problem. Not getting my hopes up. I'll keep you guys posted.

it is very possible to miswire a knock sensor.

it is very possible to miswire a knock sensor.


Thats extremely hard if not imposible to do because, in order to reach the wiring harness, the the knock sensor wires can only wrap in specific directions around the intake manifold.

Sometimes the answer to a problem is so stupid, obvious and frustrating that its hard see. Turns out when I placed the intake manifold back over the engine, one of the gaskets slipped out enough prevent a proper seal but not so much that I could not tighten the manifold. When I pulled it off the gasket was mangled and hanging off to the side. Got a new gasket at the stealership and now she running smoothly. Guess I have to change my pic. Only cost me $350 for a MAF that I didn't need. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
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Awesome that it wasn't something huge!

Maybe you can sell that MAF on eBay or in the classifieds?

sure can get rid of it on this board or on e-bay. But congrats on bringing her back !!