Spark Plugs?
#21
Replacing them at 100K miles as opposed to 30K. The issue to me is that I can replace the plugs 3x to get to the cost of the police iridium plugs. I'm also seeing that a lot of people think the Hemi doesn't like the iridium plugs (??). So...I'll likely just do the copper plugs and call it good. Changing them shouldn't be that big of a deal for the cost difference...
#22
I'd agree with going the original copper route. I've had customers use bosch platinum's and although the platinum material on the tips doesn't wear out as fast, the dwell time of the spark is not adequate and has lead to lumpier idles and easier fouling. Just from what I've seen on a few occasions.
#23
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Nope, Rod, not in a Cummins. Even way back in '89 when the old venerable ISB 5.9 went into a Dodge Ram they've used a grid heater. No glow plugs.
Last edited by HammerZ71; 07-10-2015 at 07:00 PM.
#24
platinum and iridium are two entirely different things when it comes to the HEMI. I also hear the HEMI does not like platinum. the higher resistance of the platinum plugs can wear out the coil packs from what I read.
you can buy the Police Package plugs cheaper (some) on online. I went the dealer route because I had the $150 certificate for parts.
possibly NGK iridium plugs would be the same. if you could match up the corresponding NGK part number. I tried for a while and was unsuccessful. you know the Mopar/NGK plugs have to be safe for the HEMI if they're standard issue in the Police package. I can tell you from my experience the HEMI runs great with the Mopar/NGK iridium. I've been running them for 3-4 months in daily driving on 89 octane.
for me, I'll pay the extra money and not change the plugs again. I've stripped the bolt on a coil pack before during a plug change and had to replace it. and at 16 plugs to change out??? one time was fine. I have better things to do with saturday mornings.
you can buy the Police Package plugs cheaper (some) on online. I went the dealer route because I had the $150 certificate for parts.
possibly NGK iridium plugs would be the same. if you could match up the corresponding NGK part number. I tried for a while and was unsuccessful. you know the Mopar/NGK plugs have to be safe for the HEMI if they're standard issue in the Police package. I can tell you from my experience the HEMI runs great with the Mopar/NGK iridium. I've been running them for 3-4 months in daily driving on 89 octane.
for me, I'll pay the extra money and not change the plugs again. I've stripped the bolt on a coil pack before during a plug change and had to replace it. and at 16 plugs to change out??? one time was fine. I have better things to do with saturday mornings.
#25
#26
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Not to hijack this thread, but basically there are two ways to heat the air for easier combustion during cold weather in diesel engines, glow plugs in each individual cylinder or a single grid heater in the intake manifold. Generally you'll find glow plugs in V engines and a grid heater in straight engines although either could be used in either type.
Cummings grid heater:
Cummings grid heater:
#27
Well, I replaced them last night and they didn't look bad at all to be honest. The ones in it were NGK-R's? I replaced them with the Champion Copper Plus since the general consensus is that platinum/iridium plugs don't get along with the Hemi very well and I wasn't about to spend the money on the police package plugs. The job itself is pretty simple and I had no issues. The tightest spot was the drivers side rear and that wasn't bad at all. Generally lots of room so pretty easy DIY on this vehicle...
#28
I lost the brakes on my D and had it in last week for a look-see. As it turns out, the brake booster went out. Fortunately, they fixed it under the brake recall that I had already had done. They said since there was a recall and I had it done that they would just lump the failure under it and didn't charge me a dime.
Anyways...while I was in there I asked them about the plugs. As it turns out, they suggest changing them every 30K miles. Needless to say, I am over double that, so need to do them. Here is the interesting part, they say 30K b/c they tend to get "stuck in the block". Has anyone heard of or encountered this. I am a DIY guy, but now I'm worried about trying it. Snapping off a plug would SUCK! The fact that there are 16 of them is bad enough, let alone the possibility of having one or more stuck. I'd like to hear from anyone who has changed the plugs in the 5.7...
Anyways...while I was in there I asked them about the plugs. As it turns out, they suggest changing them every 30K miles. Needless to say, I am over double that, so need to do them. Here is the interesting part, they say 30K b/c they tend to get "stuck in the block". Has anyone heard of or encountered this. I am a DIY guy, but now I'm worried about trying it. Snapping off a plug would SUCK! The fact that there are 16 of them is bad enough, let alone the possibility of having one or more stuck. I'd like to hear from anyone who has changed the plugs in the 5.7...