Thick smoke from intake mani - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

inspire · 03-02-2014, 12:36 AM

Ive just swapped in a dohc into my coupe and when I crank itll turn over fine but will not idle. ECU threw maf and knock sensor codes but when I changed ecus it just says code 55. It will turn over and sound like a harley. running rich. wet plugs but spark is fine. Timing is right. Thick white smoke coming from intake mani. Any help appreciated.

heychris · 03-02-2014, 12:48 AM

Quote:

Originally Posted by inspire

Thick white smoke coming from intake mani. Any help appreciated.

As in out of the exhaust or backwards through the intake/throttle body/CAI?

Neither is good btw. Sounds like you're not running on all 4 cylinders? (Harley sound)...Does the smoke have a smell?

Unless one or more of the injectors are bad, I'm kinda leaning towards FUBAR-red engine..

Ch

Sent from my SM-N900V using Tapatalk

mechanicalmoron · 03-02-2014, 12:49 AM

from your INTAKE manifold?

Maybe you forgot shop towels or something that where used to block up head ports, or manifold ports, on either the intake and/or exhaust side?

What's it smell like?

Don't mess with it without a fire extinguisher handy. Vehicle fires go VERY fast, and destroy EVERYTHING, you wouldn't just lose the motor (which sounds like it may be totally screwed, if you didn't make some sort of silly mistake).

inspire · 03-02-2014, 01:38 AM

Backwards through the throttle body. It smells kind very faintly of fuel. Im thinkin it may be a vaccuum leak I messed up on after my egr delete. I had a fuel leak from an injector, and I changed the o ring but I think an injector might be screwed.

Ive read that it might be a vacuum problem with that white smoke having something to do with a bypass and that its just a vacuum problem but the car does start and has a crappy idle for a few seconds til it dies which I think is caused from it running too rich. FPR vacuum maybe? IACV? could these cause this problem

Thanks guys

heychris · 03-02-2014, 12:34 PM

I agree with mechanicalmoron....unless something is plugged you should not be getting smoke from the intake out, just based on basic engine principles...you can occasionally get some blowback/popping in the intake if your timing is super early. I don't at all think it's a vacuum leak..to reiterate. ...unless someone made a silly mistake I also think the motor's done..

Ch

Sent from my SM-N900V using Tapatalk

03-02-2014, 12:36 AM	#1
inspire Leaky Injector Join Date: Dec 2013 Location: Oahu, Hawaii Age: 28 Posts: 76 Trader Rating: (0) Feedback Score: 0 reviews	Thick smoke from intake mani Ive just swapped in a dohc into my coupe and when I crank itll turn over fine but will not idle. ECU threw maf and knock sensor codes but when I changed ecus it just says code 55. It will turn over and sound like a harley. running rich. wet plugs but spark is fine. Timing is right. Thick white smoke coming from intake mani. Any help appreciated.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

03-02-2014, 12:49 AM	#3
mechanicalmoron Zilvia FREAK! Join Date: Jul 2013 Location: tx Posts: 1,073 Trader Rating: (0) Feedback Score: 0 reviews	from your INTAKE manifold? Maybe you forgot shop towels or something that where used to block up head ports, or manifold ports, on either the intake and/or exhaust side? What's it smell like? Don't mess with it without a fire extinguisher handy. Vehicle fires go VERY fast, and destroy EVERYTHING, you wouldn't just lose the motor (which sounds like it may be totally screwed, if you didn't make some sort of silly mistake).

03-02-2014, 01:38 AM	#4
inspire Leaky Injector Join Date: Dec 2013 Location: Oahu, Hawaii Age: 28 Posts: 76 Trader Rating: (0) Feedback Score: 0 reviews	Backwards through the throttle body. It smells kind very faintly of fuel. Im thinkin it may be a vaccuum leak I messed up on after my egr delete. I had a fuel leak from an injector, and I changed the o ring but I think an injector might be screwed. Ive read that it might be a vacuum problem with that white smoke having something to do with a bypass and that its just a vacuum problem but the car does start and has a crappy idle for a few seconds til it dies which I think is caused from it running too rich. FPR vacuum maybe? IACV? could these cause this problem Thanks guys

03-02-2014, 12:34 PM	#5
heychris Zilvia Addict Join Date: Oct 2007 Location: SkiTown USA Posts: 754 Trader Rating: (20) Feedback Score: 20 reviews	I agree with mechanicalmoron....unless something is plugged you should not be getting smoke from the intake out, just based on basic engine principles...you can occasionally get some blowback/popping in the intake if your timing is super early. I don't at all think it's a vacuum leak..to reiterate. ...unless someone made a silly mistake I also think the motor's done.. Ch Sent from my SM-N900V using Tapatalk