Just last night my car started to pop a little under hard acceleration in 1st and 2nd gear. It sounds like a backfiring, and it pops like 2 to 3 times under hard acceleration between the rpm range of 4-7K rpm. the car idles like it always has before (weird) and it boosts fine, and the power band feels great. what else should i check. I am going to check the plugs today. Just fyi i have denso iridium IW24. i have had these plugs for about 4 months now and you tuned the car with these plugs in.

any ideas, because i am starting to bug out a little

thanks

PS. your inbox is full

 

maybe some bad gas??? but I would start with the plugs first.

 

the gas might be an issue, because i just had filled it with a new tank of gas

but i just want to make sure

i will pull the plugs probably on my lunch break

 

Try a fresh set of NGK BR7ES and see what that does - sounds like plugs to me

 

Al,

You dont suggest using the Iridium plugs?

I was going to order these plugs today

Until I get them, I should take it easy on the throttle huh?

 

What I posted above is what I suggest

I use the BR8ES in ny 667 whp evo

 

is the gap on the platinum's the same as the iridium's. i went and got a set of the ones you suggested. I am going to install them tonight and do some datalogging and check the timing

i will let you know how it goes

thanks

ed

 

Those ones I told you are not plat - they are cheapo copper - I gap them to .26

 

ok...changed the plugs...the old ones looked good, but after installing the new plugs there was no problem. did some data logging and the lowest the timing got was 11 degrees and not popping

here is some of the info from the data log

"Engine RPM (RPM)","4621.00","4621.00","3488.00","3488.00","34 88.00","2976.00","2976.00","2976.00","1792.00","17 92.00","1792.00","1082.00","1082.00","1082.00","10 82.00","1082.00","1625.00","1625.00","1625.00","47 65.00","4765.00","4765.00","7308.00","7308.00","73 08.00","7308.00","4718.00","4718.00","4718.00"

"Vehicle Speed (MPH)","27.00","27.00","41.00","41.00","41.00","37 .00","37.00","37.00","29.00","29.00","29.00","11.0 0","11.00","11.00","11.00","11.00","0.00","0.00"," 0.00","15.00","15.00","15.00","15.00","52.00","52. 00","52.00","78.00","78.00","78.00"

"Ignition Timing Adv
(°)","39.00","39.00","22.00","22.00","22.00","21.0 0","21.00","21.00","18.00","18.00","18.00","18.00" ,"13.00","13.00","13.00","13.00","16.00","16.00"," 16.00","16.00","11.00","11.00","11.00","36.00","36 .00","36.00","37.00","37.00","37.00"

thanks for the help Al