I changed my plugs from NGK to Bosch Platinumn today and now shes running really rough almost like misfiring, i re-checked all plugs, wires, and connections, all looks ok. any ideas? PLEASE HELP.

Thanks

 

Bosch is crap in the first place. go and buy the ngk

 

 

Are you sure they are gapped properly?

 

Since this is your first post, you probably haven't seen all the threads about sparkplugs.

NGK is the only way to go on the VQ engine, nothing else works as well as the motor seems to be very sensitive. Return the Bosch plugs and get some NGK's.

 

I wouldn't say that the stock-type NGK platinums are the ONLY way to go...I have used NGK copper plugs before with good success (they just need to be changed every 30K miles are less), and I am currently using Nippon Denso platinums that frankly look and perform exactly like the stock Pt NGKs. Nice thing about the Densos is they're only ~$5-6 per plug, about half the stock NGK Pt cost.

 

I never said anything about the platinum's, I only said NGK

Some people do seem to have good luck with other brands on the VQ (I think I've even seen people mention Champion!), but it seems a lot of driveability complaints can be traced to the brand of plugs.

 

I had the same problem, I went the cheap way and spent 3 buck per plug instead of 11. That sent me to the deale for the original ngk platinum. Stick with the original. These maximas are very tempermental...

 

i have no problems with the bosch platinums
when i replaced them i bent a pin on one of the coils
make sure thats not the problem

 

it sounds like you using boch platinum 4. just go return them and get the NGK.

 

Thats what it was, i bent a pin, car is running ok now nut i left and right O2 sensors, bad, knock sensor is bad, and Ignition Signal Circuit is bad, any ideas on that last one?

 

ignition signal circuit is most likely from the coil pack...reset your ecu and check them again in a day or 2

 

You can get 6 NGk Laser Double Platinum plugs on EBay for $35 shipped. With respect why pay the same price for a single platinum plug albeit Denso makes a a quality product? At 1 time I bought 30 NGK Double platinums on eBay for $11.00 total shipped!

 

Try replacing new plugs 1 at a time with old plugs until car doesn't run rough anymore!

 

I just changed mine from bosch plats after 3k and now have NGK coppers, gaped to .041. And the engine runs like new now. Very smooth.