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My 1998 V10 has a lot of misfires, am I doing the right thing.

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My 1998 V10 has a lot of misfires, am I doing the right thing.

 
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Old 04-17-2019, 01:01 PM
belome
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My 1998 V10 has a lot of misfires, am I doing the right thing.

So, the V10 in my 1998 Motorhome has been throwing random misfire codes for the last 500 miles or so. [I noticed it was running a little rough and finally threw my ODBD reader on it and found the codes.]

Mechanic says several cylinders had over 1,000 misfires. [can they even know this?]

He recommended 10 coil packs and 10 plugs. He wanted to spend about $50 per coil pack and I balked. I ended up reading on here that the Denso coil packs were a cheaper option that seemed to have great review. I also went with the motorcraft platinum plugs.

It only has 53k on it, he insisted on changing plugs due to the misfires, he said the plugs may not survive being wet from the misfires.

He wants to change all 10 coil packs, is that overkill, or is it one of those as long as you're doing them go ahead and do them all.

Lastly, what kind of labor charge is reasonable for replacing all 10 coil packs and plugs?

Oh and how bad is the plug extraction process in the 1998's? Should I be expecting him complaining about thread issues? I'm assuming with the low mileage everything is original.
 
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Old 04-17-2019, 08:25 PM
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I wouldnít bother with the coils. Itís extremely unlikely that all ten went bad. Or even a few. Or even one really.

Do the plugs (Motorcraft) and boots (any brand that isnít the cheapest). Youíre correct about the Denso. I personally verified.

Does it lack power also? Maybe your catalytic converter(s) bad. Itís something weíve all seen and talked about lately. Also known from my personal experience.

Plenty more in your post to reply; others will chime in.
 
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Old 04-18-2019, 03:30 AM
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Please list the codes you extracted--that's the first step.

You might also post these questions in the V10 engine sub-forum.

Without knowing more I'd highly suspect there is an issue with your crankshaft position sensor or its wiring circuit. You're also fighting against the issue of age---with your vehicle approaching 21 years old that could greatly contribute to problems such as you describe. What maintenance preventative or necessary repairs have been performed?

As a suggestion before you shell out a ton of money chasing this problem pause a short bit. I do agree the plugs are probably shot if you've continued driving this for 500 miles with misfiring cylinders. I'm not convinced the COP's are bad but we don't know what brand is currently installed.

BTW nearly any OBD-II scanner can indeed read the number of misfires with ease.

Add the requested information, post this in the V10 forums and you should receive usable answers.
 
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Old 04-18-2019, 07:31 AM
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Although I have a v-8 and not a v-10,I replaced all 8 plugs and coils at 200,000 mi when one went bad. Its not a job I want to do again. Oreillys sells Accell coils in an 8-pak for less than 4 coils. I have had them in 2- 5.4 vans with over 200,000 miles and still going strong.
 
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Old 04-18-2019, 09:20 AM
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Originally Posted by Rick1025 View Post
Although I have a v-8 and not a v-10,I replaced all 8 plugs and coils at 200,000 mi when one went bad. Its not a job I want to do again. Oreillys sells Accell coils in an 8-pak for less than 4 coils. I have had them in 2- 5.4 vans with over 200,000 miles and still going strong.
With all due respect consider yourself extremely lucky that brand hasn't failed yet. Repeatedly in the V10 & V8 Modular Motors forums we see problems where this brand and so many other off-brand names have immediate issues or shortly after installation. We also see Motorcraft or Denso brands as being the first choice, sometimes the next choice after the cheaper brands fail.

You and I might be able to do this DIY but I get the feeling Belome isn't interested or comfortable in that same role----he has a mechanic who might do this work. For that reason alone he's better advised using a good brand, the ideal situation being he could purchase the COP's (and new boots too) and have them installed.

I've used Accel and Granatelli's both of which failed so very quickly. I now run only Motorcraft I can buy online for less than $35 each (new boots included) which is a fair price for long term quality.

Saving money is great---going the cheapest route is never the best path, IMHO anyway.

Another point of interest is my 2000 E250 w/5.4 motor is still running strong at 285K miles on 5 of the factory original COP's. Boots and plugs were replaced a few years back, my firm mileage for changing plugs of 50K has not yet been reached.

And yet another point is we don't know the COP's are bad---there's no real upside to changing them "just because....". Plugs should be changed if they're original with the 53K miles and have been running on misfires for the 500 miles. Those should be Motorcraft SP-479's which were originally installed when the van was new.
 
 


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