Adam P

iTrader: (19)

undefinedcanany one tell me why as soon as i put on a apexi bov my **** backfires??oh yea my car spits coolent like its kewl but its out of the over flow res why is that???

SonicRaT

iTrader: (6)

That would generally be a bad coolant seal or an air bubble in the coolant system. It backfires because you're open venting the air that has been metered by the stock injection system, thus, instead of it going to the engine, it goes to the air, and the injectors dump excess fuel into the engine, which then ignites in the exhaust.

KompressorLOgic

iTrader: (6)

backfires r cool= FIRE BALLZ!! most rx-7 backfire all the time anyway.

silverrotor

iTrader: (1)

Backfire and flames equal stained Muffler Tips and rear Bumper.

I am with SonicRaT on this one.

Adam P

iTrader: (19)

so is it a bad thing and should i be worried?

silverrotor

iTrader: (1)

Do the Coolant Seal check, its in the FAQ at the top of the page.

Adam P

iTrader: (19)

well the good news is that the seals are good(as of the faq)and ive replaced the rads. caps and now its driveable unless i race or get it sidewayz then it does the same ****

Adam P

iTrader: (19)

bad news found out to day .......apex seal blowen ive order a nu injin from the home land but it doesnt get here until a month

Project84

The coolant overflow is also caused by a small hole in the hose attached to the overflow bottle. Thermal expansion causes the fluid to build up in temp and pressure. When the pressure cap opens, the hot coolant flows into the overflow. If it didn't you'd be boiling water with the lid on the pot.

Once the engine cools off, the vacuum from where the coolant used to be will suck the required coolant back into the system. If there is a hole in the hose, it won't suck in the coolant. Next time the coolant heats up, it will keep filling the bottle.