Replace all ignition coils and spark plugs simultaneously? (2 Viewers)

[starclassic]

I have a '99 2UZ-FE with 170k miles. Driver's side ignition coils (1,3,5,7) and plugs were replaced OEM (Denso) about a year ago by the PO. The passenger's side cylinders (2,4,6,8) were replaced 6 months ago with non-OEM aftermarkets. Today I just had the 3rd of 4 non-OEM coils fail.

I clearly need to get OEM spec plugs and coils on both sides of the engine. My question is, should I bite the bullet and replace plugs and coils on ALL 8 cylinders, or am I okay to just do the passenger's side? I've never had any misfires on the driver's side cylinders.

How important is it to replace ALL the plugs/coils at the same time?

 

[TXSunDevil]

If it were me I would replace the non-OEM side and save one as a spare. They are easy to change and if you have a scanner to diagnose it can be done in a parking lot in 15 minutes.

 

[nissanh]

Denso is a subsidiary of toyota. A part made by denso and part toyota tells denso to make for them are very different. I always get oem whenever possible. If you can get oem toyota denso coils, that is the best. I installed 5 oem toyota coils removed from a sequoia and those run great and cost was $25!

 

[2001LC]

I'd only replace the non OEM/Denso since others are new(er). Just make sure part numbers match. Denso gives us one PN # for 98-07, but Toyota give several PN#. IDK what the difference is, just best to keep balanced.
When to replace Ignition coils.
Make sure all plugs match is best as well. Check gap but do not adjust on used plugs.
Spark plugs Alert Alert Alert!

 

[Battleship]

If it were me I would replace the non-OEM side and save one as a spare.

x2

 

[suprarx7nut]

I'd replace the non-OEM coils and buy one extra to keep on hand as a spare.

I'm a fan of Denso parts, unless you've got cash to burn on the genuine Toyota parts. The price difference was significant when I bought my Denso coils, so I didn't go with Toyota. I think Denso was ~$60 per coil and Toyota was around $90 through discounted online retailers. Probably closer to $120-150 at my local dealer.

I would definitely not replace all at once as a preventative measure unless you're about to embark on a cross-continent overland trip outside the US.

https://amzn.to/2FjXm65

 

[apdxyk]

Repeating this time and time again: change the boots with every spark plug change and you will never have to replace coils (aside from accidents like plug spitting, etc). I have been running a mix of OE, Denso and Flamma 107F (made in Japan) for years

 

[Torontolaggars]

I have a -99 LC100, V8.
I am replacing one ignition coil tomorrow. I bought Magneti Marelli since I can´t find Denso in Europe (live in Sweden). Hope that will work.

Which Denso and NGK spark plugs do you guys recommend? I searched in the search section and found many solutions...
Thanks!

 

[starclassic]

Thanks everyone, this has been illuminating. My plan is to purchase 5 Denso ignition coils, installing 4 on the passenger's side cylinders and keeping one as a spare. I am going to remove/check one of the Denso coils on the driver's side to ensure the P/Ns match. Was initially looking at ordering through Rockauto.com.

That leaves me with spark plugs. Are the OEM plugs on my 2UZ-FE also made by Denso? Do I need to worry about the plugs at all at this time? Does anyone have a P/N handy for those? I am at work and don't have my FSM accessible.

 

[2001LC]

I have a -99 LC100, V8.
I am replacing one ignition coil tomorrow. I bought Magneti Marelli since I can´t find Denso in Europe (live in Sweden). Hope that will work.

Which Denso and NGK spark plugs do you guys recommend? I searched in the search section and found many solutions...
Thanks!

Thanks everyone, this has been illuminating. My plan is to purchase 5 Denso ignition coils, installing 4 on the passenger's side cylinders and keeping one as a spare. I am going to remove/check one of the Denso coils on the driver's side to ensure the P/Ns match. Was initially looking at ordering through Rockauto.com.

That leaves me with spark plugs. Are the OEM plugs on my 2UZ-FE also made by Denso? Do I need to worry about the plugs at all at this time? Does anyone have a P/N handy for those? I am at work and don't have my FSM accessible.

Look at post #4. Picture is from FSM and has plug PN#

 

[starclassic]

Look at post #4. Picture is from FSM and has plug PN#

Duh ... thank you. Denso it is!

 

[Empty room]

Denso is a subsidiary of toyota. A part made by denso and part toyota tells denso to make for them are very different. I always get oem whenever possible. If you can get oem toyota denso coils, that is the best. I installed 5 oem toyota coils removed from a sequoia and those run great and cost was $25!

Wow, didn’t think about the sequoia! What a steal! Great idea

 

[ed94r]

PSA: Denso 673-1303 on sale at JEGS for $50.03. Ordered 8.

673-1303 | JEGS

Ed

 

[2001LC]

Thanks for the heads up. Try promo code SAVENOW, you may get $30 more off.

 

[Kofoed]

deleted

 

[2001LC]

Denso uses the same PN # for all the 4.7L 2UZfe to my knowledge. This engine is in 100 series (LC/LX), 4runners, GX470, Tundra and Sequoia. Why Toyota/Lexus has so many PN #'s on OEM IDK. But I've used these Denso 673-1303 with good results, at least short term (not had very long). They appear legit.

They appear to have Toyota wording ground off.

Also the 673-1303 sticker peals off the top, revealing another PN #. Or at least in set I got June 2018.

The hidden sticker seems to be fixed more permanently than the cover sticker. I've ask Jegs about this, and they said "it comes that way"

 

[poinlaw]

My 2002 2UZFE had plugs replaced (the dealer called it a "tuneup") about 175K just as preventive maint. Ten years later at about 330K the engine started running rough on the highway, which I could tell was misfiring on one or more cylinders, so I throttled back to 50 and nursed it home. I had all the plugs and coils replaced and it returned to running its normal self. I swear until that time I had no idea that the 2 UZFE used a multiple coil ignition system. This from a guy who still has his Craftsman timing light and multimeter for adjusting points and timing. Guess I ought to sell them on e-Bay.

 

[nissanh]

My 2002 2UZFE had plugs replaced (the dealer called it a "tuneup") about 175K just as preventive maint. Ten years later at about 330K the engine started running rough on the highway, which I could tell was misfiring on one or more cylinders, so I throttled back to 50 and nursed it home. I had all the plugs and coils replaced and it returned to running its normal self. I swear until that time I had no idea that the 2 UZFE used a multiple coil ignition system. This from a guy who still has his Craftsman timing light and multimeter for adjusting points and timing. Guess I ought to sell them on e-Bay.

I am waiting for my OEM 8 coil packs to show up today! $650 shipped from toyota dealer.

 

[Trapper50cal]

Get Denso coils for the pass. side and get 8 Denso Iridium TT plugs (RockAuto). My 2 cents. (and a Denso coil as a backup, so 5X) Rockauto Denso coils are fine.
NO ANTI-SEIZE on plug threads. Dielectric grease for plug to coil junction.

 

[nissanh]

Done installing all OEM coils. Checked the tighteness of spark plugs and all are tight! 2 are kept as spare and rest are still good, only 1 had a crack on the stalk! I am running denso platinum twintip plugs.