CK5
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Yank Tank Molotov/3+3, 454/magnum/Allison
- Thread starter SpeedlabDan
- Start date
'84 K30 Silverado "big Dooley"
your the noob you didnt use this in your question
so does the 8.1 have more power now also . 
Soon as I get the master cylinder replaced I'll see if it's even possible haha there's a lot of meat back there and new disc brakes...
Yes it's much better of the start in 1st haha it runs good has a miss and stutters at idle but no codes. Coils plugs and wires are new but I hope the plugs didn't foul with the vacuum leak.so does the 8.1 have more power now also .
acdlco or ngk only on plugs .
Why's that? I think I'm running autolite iridium
newer 1996 and up obd2 systems are super sensitive and gm tends to be the worst . and for the love of gad do NOT put in bosch plat plus 4 plugs . . . 
i fixed so many skips after new tune up with wrong brand of plugs people did them self just cause hey were on sale or cheaper . i even bet a guy if it didn't fix it he didn't owe me a thing . . . i got paid
i fixed so many skips after new tune up with wrong brand of plugs people did them self just cause hey were on sale or cheaper . i even bet a guy if it didn't fix it he didn't owe me a thing . . . i got paid
I agree plugs are one of the most common overlooked parts that can cause issues and that's even with classic carburated engines I guess it goes back to my dirt bike days that a bad plug meant no go lolnewer 1996 and up obd2 systems are super sensitive and gm tends to be the worst . and for the love of gad do NOT put in bosch plat plus 4 plugs . . .
i fixed so many skips after new tune up with wrong brand of plugs people did them self just cause hey were on sale or cheaper . i even bet a guy if it didn't fix it he didn't owe me a thing . . . i got paid
beags86
Eastbound and Down
I gots to agree with sweets on this one, all plugs are junk, but delcos, or ngk
Put AC Delco plugs in it. Probably want to get some Taylor 10mm wires for it sooner or later. We've found on the RV side the underhood heat kills stock 8.1 plug wires. No doubt once you get this thing going at full boil the underhood temps will nuke stock wires or stock aftermarket equivalent. Granted, the airflow through a Class A RV is pretty crappy, but a squarebody isn't much better. You'll loose cyl 5 and 7 first, then 6 and 8. Larry's keen spider sense on this picks up on it during low speed lugging in a higher gear in any one of his three 8.1 trucks. 3rd gear rolling around a corner usually makes it noticeable. He tried ceramic boot wires, still did it. The Raylar guys tipped Larry off to the Taylors. He can lug it around with the Taylors and not have it miss anymore. You would also notice the miss under a load accelerating up to speed.
I run Taylor's on my drag bike it makes sense. Too bad I already got the new plugs and wires
Do I need to post a poll about plugs? Nah its unanimous.
I figured you probably sprung for fresh parts. When the missfire starts to happen eventually, upgrade to the taylors. How long that takes depends. I had RV customer's in my workhorse days that could nuke the #5 and #7 plug wires in about 1500 miles of mountain driving. Others went 10k. Just depended on the terrain and the driver.
beags86
Eastbound and Down
No, you already been learned up.
Your welcome.
Your welcome.
I got a new set when I had the engine out I didn't know they had so much trouble.
I think Larry mentioned it in the 8.1 thread, or is polar bear burb thread. But even before that we both had to deal with the problem at Workhorse. The issue was bad enough due to improper grille opening sizing by the coach builders and other issues they built in we had to come up some extra cooling to get some air back there.
We ended up creating a kit mounting a scoop under the bumper on each side with 4" brake cooling ducts routed to force air right at the 5/7 and 6/8 plug wires. I had AZ in my region at the time and had them dropping like flies out there. Took the worst case that was killing them in 500 miles towing his bass boat with the RV to install a prototype kit (proof of concept) with home depot parts. Ended up using 4x10" floor vent registers for the scoops and 4" corrugated/segmented dryer ducts. Pre-install driving up I-17 out of Phoenix had the stock manifolds running over 1200 degrees on a 6% grade climbing. Post install had the temps down below 500 degrees for the same grade. We were pushing so much air back there it was causing the dog house cover on the floor to lift an inch off the floor at highways speed. We ended up installing two extra latches to keep it down.
