Car back firing thru intake
06-21-2007, 12:13 AM
#11
3rd Gear Member
Join Date: Apr 2005
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Posts: 585
RE: Car back firing thru intake
u can adjust out 1 tooth off. More than likely timing. Does it do it only when u rev it? if so advance the timing and see if it still does it. It could be a misadjusted valve or a dead cylinder.
06-21-2007, 12:36 AM
#12
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Join Date: Feb 2007
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Posts: 531
RE: Car back firing thru intake
normally one tooth off just makes the car run like crap, not backfire..is this SD or MAF? might have somethin to do with that.....and what do you mean you dont have roller rockers?
06-21-2007, 01:19 AM
#14
4th Gear Member
Join Date: Feb 2007
Location: Long Island, NY
Posts: 1,222
RE: Car back firing thru intake
I had the same problem....loose rocker.
In other words...the exhaust valve would not open.....therefore it would backfire out the top
.....and WHOA, that was aHORRIBLE sound [:@]
In other words...the exhaust valve would not open.....therefore it would backfire out the top
.....and WHOA, that was aHORRIBLE sound [:@]
06-21-2007, 09:35 AM
#16
2nd Gear Member
Thread Starter
Join Date: Mar 2006
Posts: 164
RE: Car back firing thru intake
Thanks guys i really appreciate all the feedback so far and 2 answer some of the questions its a maf car know it was speed density though and when we put together i really didnt have alot of money i just had a son and bought a new house so i kinda didnt buy things that i thought were a necessity like roller rockers but heres something else i thought about last nite when i was hitting my head against the wall maybe the timing chain is off
06-21-2007, 11:37 AM
#19
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: Car back firing thru intake
ORIGINAL: disdicbig1
Ok heres the deal the car is back firing thru the intake i got a stock block gt40x303 aluminum heads gt40 tubular intake msd ignition wires and distrubtor b cam supercharged with 9 psi of boost 255 fuel pump 30lbs injectors alright no matter what ive done the car is backfiring thru the intake ive changed the distrubtor went back 2 the stock ignition set the timing like thrity times changed the module just about everything u can think of and no matter what ive done the car is still backfiring so i was wondering if anybody had any suggestions
Ok heres the deal the car is back firing thru the intake i got a stock block gt40x303 aluminum heads gt40 tubular intake msd ignition wires and distrubtor b cam supercharged with 9 psi of boost 255 fuel pump 30lbs injectors alright no matter what ive done the car is backfiring thru the intake ive changed the distrubtor went back 2 the stock ignition set the timing like thrity times changed the module just about everything u can think of and no matter what ive done the car is still backfiring so i was wondering if anybody had any suggestions
From what is occuring, if you are running the appropiate MAF, your valves are misadjusted.
You have a radical setup, take your time, and id have my timing at 6-8 degrees max .
A tune withing 6 months.
06-21-2007, 11:45 AM
#20
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: Car back firing thru intake
The old school method has always worked for me.ONE CYL AT A TIME. Turning the crank with a socket and 1/2 inch torque wrench.
When the intake valve begins to move, adjust the exhaust valve, by twisting its pushrod and tightening its adjusting nut unitl slight drag resistance is felt.STOP
Put a white out mark and turn the nut another 1/2 -3/4 of a turn.
When the exhaust valve is almost closed, do the same for the intake valve's pushrod.
Using a breaker bar takes to long. Using the multiple cylinder method, has failed a few times.
When the intake valve begins to move, adjust the exhaust valve, by twisting its pushrod and tightening its adjusting nut unitl slight drag resistance is felt.STOP
Put a white out mark and turn the nut another 1/2 -3/4 of a turn.
When the exhaust valve is almost closed, do the same for the intake valve's pushrod.
Using a breaker bar takes to long. Using the multiple cylinder method, has failed a few times.