Spark Plugs Driving me Crazy!!!

[LB4Runner05]

At 108K miles I have changed the plugs twice using the denso/Iridum split and so far have had no issues. The plug wiring might need to be changed next swap for me. The plugs are a straight forward job and it seems the problem you are having is elsewhere. I do know that when resetting the ECU it requires the computer to relearn the system and it takes some time. I believe more info is posted somewhere on the site.

 

[t4rnit]

2 Days later. This morning went to the Toyota Dealer to get a scan.

While driving there. Guess what?! The 4runner decides that it wanted to start idling correctly again 2 blocks before I get to the dealer!!! Car started to idle as it should on 600.

So I got to the dealer since I might as well scan, since they agreed to do it for free. Just wanted to see if any issues would pop up. Got the car scanned. NOTHING! :thumb3:

Guess it's time to get the Iridiums now! :redbrick:

At least the Stock Denso's only cost 20 bucks. What do you all think though? Now that the new Denso's are in, should I wait 30k before I swap out for the Iridium. Or are the Iridiums that much of an improvement that I might as well change them out now???

 

[t4rnit]

At 108K miles I have changed the plugs twice using the denso/Iridum split and so far have had no issues. The plug wiring might need to be changed next swap for me. The plugs are a straight forward job and it seems the problem you are having is elsewhere. I do know that when resetting the ECU it requires the computer to relearn the system and it takes some time. I believe more info is posted somewhere on the site.

Didn't think it would take so long to reset! When I put the stocks back in to avoid the Platinums the first time. The stock plugs reset after turning the car off once, and turning it back on again.

Thanks for everyone's 411 btw

 

[ronsta]

Didn't think it would take so long to reset! When I put the stocks back in to avoid the Platinums the first time. The stock plugs reset after turning the car off once, and turning it back on again.

Thanks for everyone's 411 btw

So what was the verdict? i changed mine to IKH20 recently and still getting bad MPG

 

[BlackWorksInc]

I installed the original not the iridiums.

If it was a bad coil. Wouldn't my car do the same when the old spark plugs are installed?

For some reason, when I install the old half NGK and half Denso, There are no issues! and the car runs fine?

that is not necessarily true, your engine, like all modern Toyota engines is a coil on plug design, you could be causing your problem simply by removing and installing the coil. Though it doesn't sound like this may be the case.

what are you using to measure and adjust the spark plugs, and where are you getting your specifications?

 

[BlackWorksInc]

Last Modified: 3-1-2011 6.4 F From: 200707
Model Year: 2008 Model: 4Runner Doc ID: RM000002EFA002X
Title: SERVICE SPECIFICATIONS: 1GR-FE IGNITION: SERVICE DATA (2008 4Runner)

SERVICE DATA
Spark plug

Recommended spark plug
DENSO made
K20HR-U11

NGK made
LFR6C-11

Electrode gap
1.0 to 1.1 mm (0.039 to 0.043 in.)

Maximum electrode gap
1.41 mm (0.056 in.)

This is what Toyota is specifying for the spark plugs and the gap.

 

[KB084RUNNER]

At least the Stock Denso's only cost 20 bucks. What do you all think though? Now that the new Denso's are in, should I wait 30k before I swap out for the Iridium. Or are the Iridiums that much of an improvement that I might as well change them out now???

Since it is running fine with new stock plugs...I would keep fixing it until it's broke again..... Put in some really different plugs that are also not recommended like maybe from a 1967 Evinrude outboard motor and let us know what happens. I'm boring and just use what those guys at the factory tell you...(WTF do they know?) but I really enjoy reading about trying different parts out for a spin and making a 30 minute project into a 3 day experiement.