Fuel Leak From Exhaust Housing

[Landy]

Ok guys, heres the story. Been working on my 33 last few months while it was getting painted. done things like replace all the vaccum lines and little bits around the engine bay.. last month or so my turbo has started coming to bits ie sounds like the bearings are stuffed. went to start my car today and it was running really bad so i drove my other car. got home tonight and discovered when the car was running fuel was slowly dripping from the join between exhaust and turbo.. . cant figure out whats going on here.

[GeeTR]

Sure it wasn't hot runny oil? Did it smell like fuel?

[Landy]

positive it fuel. stinks like fuel as soon as car start and i smelt the leak. pretty sure it fuel.

[Landy]

I was thinking it might be either injector sticking open or maybe a faulty coil pack and unburnt fuel going through exhaust housing. anyone know how to test for this

[skylinekid]

check ur oil level if its way over full then drop ur oil and that could be ur issue. but if ur injectors are gettin stuck open u have other issues to sort out aswell

Edited July 9, 2008 by skylinekid

[**RB2530**]

I would expect that if it is unburnt fuel it would almost certainly ignite as soon as it hits the exhaust manifold...I am sure you would notice this straight away...

Try getting a sample of it (only small) and igniting it with a lighter...obviously be very careful...alternatively check its SG but to do this at home you would need either a big sample or fairly precise scales...SG of fuel is about 0.7g/cc...Also see if it mixes with water...

[nizmonut]

put your key in the on position, undo the CAS and then listen very carfully while you turn the cas you will hear the injectors "clicking" as they open and shut. all six injectors should "click" with four complete turns of the cas keyway.

3 injectors squirt fuel per revolution of a 6 cylinder engine, the cams are a reduction to 50 %, thats why you need to turn the cas four times to fire all six coils and injectors.

[Landy]

Oil Check Ok.

ill try get a little bit of the leak and see if it light tomorrow in the light

As for CAS. not technicaly minded enough to go pullin stuff like that off so ill have to let that one go.

Any futher input would be much appreciated

[QWK32]

probably not a good idea to drive it around if you think its fuel. does the engine sound like its missing, then it could point to a dodge coil? or it could be just overfueling, what ecu are you running? if you have you been cranking the engine lots without running it, you could have fuel in the oil. dump some of the oil and check it out.

btw. one complete turn of the cas fires all cylinders. one turn of the cam is two turns of crank. all cylinders have fired after one cycle of the cam or two cycles of the crank.

[blind_elk]

Checked the coolant? It could be coolant coming out through a weeping welsh plug.

I'm positive it isn't going to be fuel. Considering the fuel lines are all on the opposite side of the engine. And any fuel coming in contact with the hot exhaust headers would either ignite (worst case) or simply vapourise.

[Landy]

Ok guys so i got home from work and tried to start it and it turned over and stopped. so i thought instead of damaging internals it was time to start to take things off the car. stripped pipes back to turbo to check out the comp wheel to see if it was stuffed. was ok. took of the coils and checked them for visual damage.. ok.. so i took out the plugs. Then i disconnected the fuse to fuel pump to lower fuel pressure and turned the car over(probably not a good idea considering there was no compression)didn't think of that till after.. but in the process of turning it over i had a nice big spray of fuel come out of the 6th cylinder. tried it again and happened again..

So what you guys reckon, faulty injector. im leaning that way. by the way im running a SAFC could that be the prob?

Also while i got the coil packs off i was thinking i might test them. i know you have to test resistance but across what points? and what sort of reading am i suppose to get..

Cheers guys

Edited July 10, 2008 by Landy

[GeeTR]

LoL, wouldn't it be funny if it was a stuck injector pintel, filling your cyls with fuel - dang Strange it didn't evaporate on the hot manifold.

Hopefully you didn't bend a rod.

[QWK32]

yeah, injector 6 may be stuck open, or coil/plug for number 6 isn't firing. it sounds like there was that much fuel in the cylinder you got hydraulic lock, thats why it turned over once and stopped. and no, the safc wont be the problem as its only happening to one cylinder.

[Duncan]

will be very interested to see what your mechanic comes up with. even stuck open an injector shouldnt be able to leave that much liquid fuel in the exhaust manifold

[jeffworld2]

perhaps safc could be sending the wrong output to that injector? its easy enough to disable the safc and do same again.

weird problem tho. cant beleive it was fuel my bet was on water lol

[QWK32]

safc doesnt interact with the injectors, well not directly anyway. it plays with the MAF signal to trick the ecu into adjusting the fuel mixtures. if it was a problem with the safc you would see overfueling/underfueling on all the cylinders, not just one.