Spark Plugs and Wires

[bdy0003]

I currently have Denso wires and Bosch plugs and they give me ~27mpg. When I switch to NGK wires, I get ~16mpg. Could it be the connectors of the bosch plugs don't connect to the NGK wires well?

[LynchburgCSI]

It's the BOSCH plugs. GET THEM OUT OF THERE! They make our cars run like crap. NGK or Denso please.

[bdy0003]

HAHA, duely noted, however, I've had Bosch plugs for 48k miles and I have had no problems so far. (I guess)

[LynchburgCSI]

^ it just tends to be the thought around here. BOSCH = . Are both sets of plug wires the same specs? Both new? I don't why that would cause such a large drop in MPG.

[hill8570]

Have you pulled a plug and compared the spark with the NGK and Denso wires?

That's a pretty huge drop in MPG -- maybe one of the NGK wires is really bad. Does the engine run really rough with the NGKs?

[Judge2]

Originally Posted by hill8570

Have you pulled a plug and compared the spark with the NGK and Denso wires?

That's a pretty huge drop in MPG -- maybe one of the NGK wires is really bad. Does the engine run really rough with the NGKs?

I was once convinv
ced to follow the rulr blindly, Japanese car Japanese P
plugs, that is such a magnitude change that one has to consider is something else going on.

[JohnGD]

Put the Denso ones back for a couple of tanks. See if you get 27mpg back.

Maybe the NGKs weren't fully seated, etc etc. The plugs haven't changed.

Sure, some say to use NGK or Denso plugs. I'd go with NGK Iridium-IX. Good stuff. But again, I think it's most likely the wires because that's what you changed.

Originally Posted by bdy0003

I currently have Denso wires and Bosch plugs and they give me ~27mpg. When I switch to NGK wires, I get ~16mpg. Could it be the connectors of the bosch plugs don't connect to the NGK wires well?

[bdy0003]

I'm sorry disregard DENSO. The wires with the 27mpg are STOCK (replacing them cause their old), however I don't recall the company name, maybe Montisoto? Part number on the NGKs are RC-TE62, checked the resistance and they are all fine. Engine doesn't ride rough on both set of wires.

I put the NGKs in and then the MPGs started dropping. As soon as I put my stock wires back in, my MPG went back up. I ordered 4 NGK platinum plugs. Maybe that will make a huge difference.

[10gxiong]

Originally Posted by bdy0003

I'm sorry disregard DENSO. The wires with the 27mpg are STOCK (replacing them cause their old), however I don't recall the company name, maybe Montisoto? Part number on the NGKs are RC-TE62, checked the resistance and they are all fine. Engine doesn't ride rough on both set of wires.

I put the NGKs in and then the MPGs started dropping. As soon as I put my stock wires back in, my MPG went back up. I ordered 4 NGK platinum plugs. Maybe that will make a huge difference.

I'm pretty sure your car will get a lot better mpg's after swapping in the NGK's. I don't think the Bosch brand should ever be used on any import. I've always used NGK/Denso ignition components in all my vehicles with no problems.

[bdy0003]

UPDATE: I got 26mpg using my Yazaki/ Sumitomo stock wires with my Bosch Platinum plugs. My plugs were covered in ash (compliments of Seafoam?). I replaced my wires with NGK wires and put NGK platinum plugs. We'll see what kind of mileage I'll get.

[JohnGD]

OEM wires are often Yazaki. The same company recently raided by law enforcement for suspected antitrust practices (that is, companies in bed with each other).

NGK should be a very good wire set. I wonder if you got a defective wire.

I'd also use their NGK Iridium-IX, not plats. Select from the NGK online catalog.

http://www.ngksparkplugs.com/part_fi...t.asp?mode=nml

Originally Posted by bdy0003

I'm sorry disregard DENSO. The wires with the 27mpg are STOCK (replacing them cause their old), however I don't recall the company name, maybe Montisoto? Part number on the NGKs are RC-TE62, checked the resistance and they are all fine. Engine doesn't ride rough on both set of wires.

I put the NGKs in and then the MPGs started dropping. As soon as I put my stock wires back in, my MPG went back up. I ordered 4 NGK platinum plugs. Maybe that will make a huge difference.

[JohnGD]

So the black coating is dry? That's too rich a mixture.

If it's wet then it's leaking oil.

Originally Posted by bdy0003

UPDATE: I got 26mpg using my Yazaki/ Sumitomo stock wires with my Bosch Platinum plugs. My plugs were covered in ash (compliments of Seafoam?). I replaced my wires with NGK wires and put NGK platinum plugs. We'll see what kind of mileage I'll get.

[bdy0003]

Its white.

Originally Posted by JohnGD

So the black coating is dry? That's too rich a mixture.

If it's wet then it's leaking oil.

[bdy0003]

I indeed might have defective wires, however the resistance across all the wires were lower what the manual said not to use.

Originally Posted by JohnGD

OEM wires are often Yazaki. The same company recently raided by law enforcement for suspected antitrust practices (that is, companies in bed with each other).

NGK should be a very good wire set. I wonder if you got a defective wire.

I'd also use their NGK Iridium-IX, not plats. Select from the NGK online catalog.

http://www.ngksparkplugs.com/part_fi...t.asp?mode=nml

[JohnGD]

Yeah, it may be all the stuff SeaFoam cleaned up. I guess Techron's ashless dispersant has its place.

Originally Posted by bdy0003

Its white.