Back-fire 1988

Hi, my 1988 Nissan v6 backfires a lot around 1500 rpms! I check for any intake leaks, and I can't find any, and I have no clue were the "air diverter valve" is located. It isn't a loud backfire, just a pop noise that is noticeable. I have an oversized K&N in it as well. Please help!

Alex

It's more an annoyance than a performance issue (imagine a viper driving down the road, and it back fires. It's humiliating)

Hi Alex,

Check under the emissions for the air induction value for the truck. Check the operation of the AB (anti-backfire) valve. Check the air induction filter, a badly clogged valve can cause the same issue.

Tom