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post #1 of (permalink) Old 12-15-2001, 06:29 PM
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Spark Plugs

I have a miss under load (low RPM, trying to accelerate...especially up hill or with the A/C on). I've read some previous posts about this and the first place I want to check is the plugs (old Bosch platinums) and the timing. My engine is the 351W/E40D combo. I use a MSD Blaster coil with Accel cap and rotor(just changed) and Taylor Spiral Core wires. Seems like it came on a while after making the change to the MSD/Bosch/Taylor combo a couple or years back. Any thoughts as to what might cause the miss and what kind of plugs to get??? I've heard that Bosch aren't the best for Fords and that Motorcraft or Autolite are the best. Any imput would be great. Thanks

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post #2 of (permalink) Old 12-15-2001, 06:49 PM
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Re: Spark Plugs

Get the boschs out. I had tried a set of those and after a month, the platinum tips were disintegrating. Although i currently have a problem similiar to yours(missing at low rpms at cruise up a hill), mine i know is my fordracing 9mm wire set. I am currently using AC Delco Rapid-fires but im told by Ford performance experts to only use Motorcraft or Autolites as you said, and not to waste your money on any of those fancy plugs. My last set of wires were arcing through the boot to the exh. manifold causing a miss and i know this warranty replacement set is now doing the same thing, but i haven`t pinned down which wire is malfunctioning yet.
Im also wondering if theres any *truth* to that plasma formation under my accel cap since their not vented like stock ford ones as mustangs and fastfords magazine tech article pointed out.[img]/wwwthreads_images/icons/crazy.gif[/img] Maybe i will try a stock cap and see.

But pull out some of those Bosch`s and with a good light and a magnifying glass, inspect that little platinum tip and im sure you`ll find them burn`t up just like i did.
Im running a Crane ignition system w/high output Fireball coil, but my wires were malfunctioning even with the ign. system bypassed.

Good-luck...

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post #3 of (permalink) Old 12-16-2001, 02:06 PM
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Re: Spark Plugs

The first place to look is the plug wires when they take a dump that is how they act thew will miss under load but work ok at cruse had fits once had new wires and that prob.and i used a set of used wires and tryed it and worked fine took the new ones back and got good wires.good luck Bill

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post #4 of (permalink) Old 12-16-2001, 04:59 PM
 
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Re: Spark Plugs

I tried the Bosch Platinums too. They worked great in the Dodge Caravan, but in the 89 351W, not so good. It runs like crap until it warms up, but always idles like crap. It ran fine with the Motorcrafts.

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post #5 of (permalink) Old 12-17-2001, 01:04 PM
 
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Re: Spark Plugs

I 2nd the AC Delcos and motorsport wires. Worked great for me so far.


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post #6 of (permalink) Old 12-17-2001, 02:49 PM
 
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Re: Spark Plugs

I'm running the Accel header plugs,coil and, Ignition System. Once I figured out the correct plug gap and the Correct timing, Every thing is good- I idle at 675 and real smooth. It also gave me better throttle response.

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post #7 of (permalink) Old 12-18-2001, 12:24 AM
 
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Re: Spark Plugs

One more vote for ditching the Bosch Platnums

They haven't run well on anything I own. Currently running A/C Delco plugs, gapped out to .060 to take advantage of the MSD-6 and TFI style MSD blaster coil. Like others I'm running those sale priced Crane wires someone(think it was Steve) tipped us off to last Spring. I've pulled three off the plugs leaving the boot and end on the plug, but crimped them back on no problem.

You can take the wires in to get them tested for resistance value, most places will do that free for you. I'll probably spring for a new set of Jacobs wires and one of their super thick (well insulated), real brass terminaled caps and rotors next Spring.

Sixlitre

p.s./
What are the Bosch gapped out to ?

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post #8 of (permalink) Old 12-20-2001, 06:17 AM
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Wires

Nope - I can't take credit for that tip. But I got 2 sets of wires.[img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img]


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post #9 of (permalink) Old 12-20-2001, 03:47 PM
 
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Re: Spark Plugs

Sixlitre is the one who gets the credit for the Crane Wire sale back in March!

Havack!

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post #10 of (permalink) Old 12-20-2001, 11:14 PM
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Re: Spark Plugs

Oh that's funny. Sixlitre gave props to steve, but he was the one who actually dug up the deal for everybody! If i dont bust my budget on the axle swap i should be able to get a MSD coil, new wires, and new plugs at .060. Hopefully that will kick me up 1 mpg or so... wishful thinking. I just replaced my check valve on the crossover tube and WOW it's like somebody took my truck and turned the treble all the way down and the bass all the way up! I can actually hear my exhaust rumbling at idle now and i get a loud drone inside with the windows up on the highway, but that's a good sign! I can still hear the cat pumping out exhaust though. What kind of hose can i use to connect the air tube to the cat? It's only ~6" but it needs to be high temp of some kind i would think. And i had a good first experience at Advance, but they didn't have 1/8" rubber hose for vac lines, just 7/64 or something that was WAY too small. But it doesn't feel very heat resistant. Havack, what was that line you got at FORD by the foot? I think that might work better because it's not as big on the outside... even this small tubing (i got a 2 inch sample) is kinda big on the outside, despite being too small I.D. I think i'm gonna pull my PS pump this weekend and do a drive-by... I'm not sure if i want to get a free replacement or spend more $$ and get another one at advance or napa. Are there any GOOD ones at these stores, and/or does ford carry a NEW one that's not 500 bucks? Maybe I should order an AGR and be done with it???


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