Ka24de intake backfire.. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

thelrgkid · 03-22-2010, 06:52 AM

So here's the thing, I'm running a completly stock ka24de and ti was running fine besides noises of the loose timing chain. So I redid the upper and lower chains and started it up and timed it with the light it runs smooth now. But when I give it gas it backfires through the intake. And if you put your hand infront of the hole on the air box when giving it gas, it sucks super hard like it's getting lots of air. Any suggestions on how I can six this?

murda-c · 03-22-2010, 07:00 AM

You must have timed it wrong. Intake backfire is caused by the plugs firing before the intake valve is closed, so your ignition or cam timing are probably off.

thelrgkid · 03-22-2010, 09:07 AM

Before posting this I pulled covers twice. I just pulled the top cover and cams and it was perfect I re did it anyways and put it all back properly. It still backfires. Any more ideas?? Thanks

kujacks · 03-22-2010, 03:01 PM

take it to a shop

thelrgkid · 03-22-2010, 03:55 PM

Quote:

Originally Posted by kujacks

take it to a shop

I would if I had the money to.. That's why I'm asking for help on a forum!!! Your comment was no help...

modulation · 03-22-2010, 10:08 PM

Quote:

Originally Posted by thelrgkid

I would if I had the money to.. That's why I'm asking for help on a forum!!! Your comment was no help...

Double check you got your cams right, if that's it then you are probably a tooth off on the distributor. Have you pulled your TPS harness and verified your timing with a timing gun?

thelrgkid · 03-23-2010, 12:53 AM

Quote:

Originally Posted by modulation

Double check you got your cams right, if that's it then you are probably a tooth off on the distributor. Have you pulled your TPS harness and verified your timing with a timing gun?

Thanks. I pulled the tps before and timed it but I was just on the wring mark. After fixing it it runs like new!! Thanks

03-22-2010, 06:52 AM	#1
thelrgkid Zilvia Member Join Date: Aug 2009 Location: Sacramento CA Age: 34 Posts: 207 Trader Rating: (2) Feedback Score: 2 reviews	Ka24de intake backfire.. So here's the thing, I'm running a completly stock ka24de and ti was running fine besides noises of the loose timing chain. So I redid the upper and lower chains and started it up and timed it with the light it runs smooth now. But when I give it gas it backfires through the intake. And if you put your hand infront of the hole on the air box when giving it gas, it sucks super hard like it's getting lots of air. Any suggestions on how I can six this?

03-22-2010, 07:00 AM	#2
murda-c Post Whore! Join Date: Jan 2007 Location: Montgomery County, MD Age: 35 Posts: 3,197 Trader Rating: (1) Feedback Score: 1 reviews	You must have timed it wrong. Intake backfire is caused by the plugs firing before the intake valve is closed, so your ignition or cam timing are probably off. __________________

03-22-2010, 09:07 AM	#3
thelrgkid Zilvia Member Join Date: Aug 2009 Location: Sacramento CA Age: 34 Posts: 207 Trader Rating: (2) Feedback Score: 2 reviews	Before posting this I pulled covers twice. I just pulled the top cover and cams and it was perfect I re did it anyways and put it all back properly. It still backfires. Any more ideas?? Thanks

03-22-2010, 03:01 PM	#4
kujacks Join Date: Jan 2010 Location: S.G.V Ca Age: 41 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	take it to a shop