420A 2gNT popping from tail pipe at idle

[safirenside]

Ok so I have stage 2 Crower cams Crower springs and retainers, JE 8:5 compression pistons eagle rods ect. Non turbo at the moment stock ecu. I'm hearing a popping from the tail pipe at Idel and it's not constant goes and comes as it idles. Timing is dead on changed spark plug wires new spark plugs checked coil. While driving everything is fine a/f ratio is good .

 

[renovatdkitchen]

I'm no professional, but my GSC S2 cams will also cause a misfire sometimes.

Does it pop a bunch of times in a row or just a bit every now and then?

 

[safirenside]

I'm no professional, but my GSC S2 cams will also cause a misfire sometimes.

Does it pop a bunch of times in a row or just a bit every now and then?

Just a but every now and then at idel. Not constant popping.

 

[necrotopsy]

do you have a cat? i noticed that not having a cat makes it so you can hear little pops in the exhaust.

 

[safirenside]

Your probably running rich and with the overlap you have it's not burning the fuel off and that's what you hear at idle. I've never seen anyone go the way you did with your set up. Your afr has to be off or it wouldn't pop at idle it's a misfire your having.

So is there anyway to fix it 0r is it common? A/f ratio at idel and driving is 14-15.

do you have a cat? i noticed that not having a cat makes it so you can hear little pops in the exhaust.

No cat but I think a test pipe it's hollow inside I got the exhaust from Ebay headers back.

Also the motor only has about 400 miles on it. I did a wot pull and it back fired when i shifted in to 2nd.

 

[safirenside]

Google it and read on backfires learn why they happen.

Unburnt fuel entering the exhaust I know that but should it be .doing that on a stock fuel system? The major changes is lower compression pistons and bigger cams.

 

[Sebba]

What did your friend Idel say about it?

 

[DSM1G90]

Why you hear Formula cars pop and pop at idle before the green light on the "christmas tree" comes on - got them big ol' hi rise, full race cams with huge overlaps.

With old cars it was fun to make an exhaust pop by revving up the motor, suddenly shutting the key off while keepin the gas pedal down, and as the motor revs down, hit the key and "BOOM!" out the tailpipe.

 

[safirenside]

The stock fuel system doesn't matter it's the overlap you have with bigger cams and the stock ecu can't correct it. If your afr is on then it should be ok but I wouldn't try to run it hard till your motor breaks in. Usually takes about 1500 miles to break in rings on forged pistons.[/QU

Ok thanks guys for the input its my first built motor I just wanted to make sure I wasnt gonna ruin it right off the bat. I have been take it easy on the motor no more than 3500 rpm.