I feel like I just cheated on her

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+1 on not using Bosch plugs. I have personally seen and heard way too many stories about platinum tips falling off, short lifespans, misfire issues, and mismatched recommended plugs for the application. Never had any issues using NGKs, Densos, Autolites, or ACDelcos. Probably the best luck I had (personal opinion here, not a technical assessment) was with ACDelco double platinum plugs. Gap was perfect on all 8 of them after 115,000 miles. Bosch platinums in the same car failed at 23,000 miles after two of the platinum tips came off, widening the gap beyond what would run and the car was misfiring off the line at every stoplight. The Bosches are cheaper for a reason.

As far as the oil, your choice is more than fine.
 
I have had horrible experiences with Bosch plugs on my old Cavalier. In fact, the jbody forum is littered with people who had terrible experiences with them.

Though they work fine in my wife's SUV. So...
 
My neighbor is a pilot for a major airline and has a jeep . It must be a pilot thing
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I just put bosch plugs in my century, the double platinum ones. It had ac delco in probably from factory and there is a little round tab on the electrode that looks like a point. 2 or 3 of those little tabs broke off, hope it didn't do any damage!

So far the bosch plugs are working good but only 1500 miles on them.
 
What is the point of the +2 or +4? Electricity will only make one spark, the place of least resistance. I have seen many late model cars run like [censored] on boschs, but as soon as OEM plugs re reinstalled, they run perfect.
 
Originally Posted By: beast3300
Platinum or Iridium are designed for longevity. Best performing plugs in heat dissapation are copper. All the supercharged 3800 guys run copper because they work the best.

platinum is bad for boost, on the other hand, iridiums are great for boost.
 
Originally Posted By: countryboy9799
I just put bosch plugs in my century, the double platinum ones. It had ac delco in probably from factory and there is a little round tab on the electrode that looks like a point. 2 or 3 of those little tabs broke off, hope it didn't do any damage!

So far the bosch plugs are working good but only 1500 miles on them.


This is common the original AC Delco double platinums used. The gap will go from .060 to .080 when the platinum pad falls off. This might be why GM went to NGK to supply most of the AC Delco branded plugs now.

FYI: There used to be a disclaimer on Bosch's website that says not to use Bosch platinums in DIS equipped cars. (DIS: distributor-less ignition system, i.e. 3100/3400/3800 and the like).

So when comparing personal stories of how well the platinums worked for you please compare apples to apples. A General Motors with DIS will eat Bosch platinums (fact).

Alternately, a COP set up (coil on plug) that fires all the spark plugs in one direction (polarity; similar to a old school distributor) will wear plugs differently.

Sorry not trying to be a you know what, just want apples to apples comparison.
 
Originally Posted By: beast3300
Originally Posted By: countryboy9799
I just put bosch plugs in my century, the double platinum ones. It had ac delco in probably from factory and there is a little round tab on the electrode that looks like a point. 2 or 3 of those little tabs broke off, hope it didn't do any damage!

So far the bosch plugs are working good but only 1500 miles on them.


This is common the original AC Delco double platinums used. The gap will go from .060 to .080 when the platinum pad falls off. This might be why GM went to NGK to supply most of the AC Delco branded plugs now.

FYI: There used to be a disclaimer on Bosch's website that says not to use Bosch platinums in DIS equipped cars. (DIS: distributor-less ignition system, i.e. 3100/3400/3800 and the like).

So when comparing personal stories of how well the platinums worked for you please compare apples to apples. A General Motors with DIS will eat Bosch platinums (fact).

Alternately, a COP set up (coil on plug) that fires all the spark plugs in one direction (polarity; similar to a old school distributor) will wear plugs differently.

Sorry not trying to be a you know what, just want apples to apples comparison.


I will have to look into that, will bosch refund my money if I tell them I wasnt happy with them?

How come so many places, even bosch's website recommends them for my engine?
 
+100000000000000000000000 on the getting rid of the Bosch plugs.

Go with the Autolite Platinum(AP5224) or Double Platinum(APP5224) plugs. I'm using the double platinums in my KJ. She loves them.

P.S. Don't forget to use anti-seize on the threads and dielectric grease on the porlecain.
 
What kind of plugs should I put in my 3100?

Just got off the phone with bosch and they were very nice to deal with at this point, going to email me a form to fill out and mail back with plugs to refund my money.

Why dielectric grease on the porlecain?
 
It all depends on your application. Many cars hate Bosch plugs, but they do have their uses.

Example - I had a '94 GMC 4.3 with a bad valve guide on the #5 cylinder... it leaked oil into the cylinder and would build up lots of soot on the spark plug's ground electrode... I used Bosch Platinums in that applicaiton because the side of the electrode was completely shielded by the porcelain... in that case, the Bosch Platinum proved to be the best plug for my application. With any other plug, the soot would have fouled out the plug within 10,000 to 15,000 miles, but the Bosch platinums were good for twice that.

My guess is the Bosch plugs might work OK in a jeep, but Champion or NGK will work better. OEM-style plugs are probably your best bet unless said OEM-style plugs are copper-electrode and you want something that will last longer. In that case, NGK Iridiums are hard to beat.


Quote:
What is the point of the +2 or +4? Electricity will only make one spark, the place of least resistance.

+1
2 ground electrodes won't give you 2 sparks, 4 ground electrodes won't give you 4 sparks. IMHO those extra ground electrodes are a liability, since they are probably impeding flame kernel development.
 
Last edited:
Countryboy: Get the most current spark plug application in the AC Delco Iridium for your 3100. The reason that part's stores say to use Bosch is because a note pops up saying "original equipment is platinum." So naturally recommending Bosch platinum's occurs at many part's stores.

I bypass the parts counter jockeys and walk straight into commercial if/when I walk into Autozone. So when I say give me Autolite 104s, they don't say what kind of car do you have. No, I didn't ask you what plug my car takes, I said give me Autolite 104s. But I digress........

Dielectric grease on the porcelain (or put it in the spark plug boots) is so the plug wires don't stick to the porcelain. It may still happen but that is all you can do.
 
Originally Posted By: countryboy9799
Why dielectric grease on the porlecain?
It reduces the chance of arcing along the inside of the boot.
 
I meant porcelain btw
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It's to prevent moisture from getting between the boot and the spark plug. Prevents rust as well and makes for easier install/reinstall of the boot. For the 3.7 EGK, it's a coil pack, not a boot.

The anti-seize on the threads is highly recommended. This will protect the threads and make removal of the plugs later on much easier.
 
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