PlatinumCarioca

I have 70,000 miles on my truck and swapped out the plugs for the new SP534s about 2 weeks ago. Although I've noticed a smoother idle and overall drive, my mileage has taken a considerable drop. I was averaging around 16.5 city+hwy, now I'm seeing low 14s.

Has anyone noticed this too? I'm wondering if maybe it's just that I've been doing more local city driving in the past two weeks, but it's quite a drop in fuel mileage...

Resetting the PCM may help? Any thoughts?

johnt2_2002

Local city driving doesn't help the fuel economy much. I would suggest resetting the PCM and while your at it, check/replace the air filter if needed. I replaced mine a couple of weeks ago. It gets dirty quick I find....

itguy08

That's about the best price. Nobody locally stocked them other than the dealer at around $6.50 per plug. Buying 12 of them offset the shipping cost a bit from RockAuto. As did a 5% coupon code.

pprior

If I unhook my battery to reset the engine computer will I lose all my navigation information /address book?

Lizardking419

Bought them from Rockauto. Used the 5% discount code too. Ended up coming out just a little bit above $28 with shipping. I went to Pep Boys and they did not stock them either.

jknight

I got mine from Rockauto also. The air filter was dirty at 23800 miles.

SkiSmuggs

Based on how fast that gap opens up, .030 is the max new plugs should be set to. .028 may be even better, unless you re-gap every 15K and replace every 30K if you tow or run hard. You can extend the air filter to 30K by knocking dust/dirt out of it and running a vacuum over the down side, plus in the airbox. I saw dried mud in the snorkel.

stagalv

I just bought a set of the SP-534 plugs. The box says "Spark plug gap is not adjustable". It doesn't say what the current gap is. Are they preset at .030? Gotta find in feeler gauge.

PlatinumCarioca

My understanding is that the new SP-534s are pre-set to 0.30. When I picked mine up at O'Reilly we pulled all of them out of the box and measured. Every single one exactly at 0.30.

PlatinumCarioca

Ordered an AEM dry flow off Amazon and it just got here yesterday. It's going in today - hopefully that will help out. Curious to see what the old filter looks like when I pull it...