I just love my truck (NOT!)

[myclone]

Simple task...install new plugs/wires to replace the pieces that have been in there since the nats at chitown umteenzillion years ago .

No big hurry in doing it since Ive had the parts laying around for months and I took my time so that I could tidy up some wiring and vacuum hoses while I was at it. Get everything done and fire it up...idles a little better...nice..lets go for a spin :tup: . Roll into the throttle and at 12psi the truck noses over...WTF? I monkey with things to make sure I didnt muck anything up or knock something loose. Nope...scratch head...check fuel pressure...its good (scratch head somemore/cuss) so I fire up datamaster and take a look at things while doing another 35-50mph 3/4 throttle run...everything looks fine but it still falls on its face at 12psi and now Im getting 14+ degrees of KR. WTF? Back to the garage for more head scratching/cussing.

Plugs/wires are a bitch to swap and its midnight so I tackle the easiest piece first..the dist cap. I pull the new one off and go to install a new spare I thought I had on the shelf...no go since I gave the spare to a bud a while back for use on his S10. Damn.... I pull a cap off of a junk 4.3 that has 150k+ mils on it and throw it on just for the hell of it. That fixes the nosing over/breaking up at 12psi but Ive managed to pick up an extra 12-13 degrees of KR somewhere (UGH!) so I head back to the garage for more cussing/head scratching. I monkey with it for about an hour without finding anything obvious so I throw some 116 octane in the tank to see if the KR is real or immaginary....no improvement :roll: . Sitting in the garage I whack the throttle to see if I get any KR with no load...yep, 14 deg of KR at 5500 in park. I figure I'll cut the neighbors some slack and quit for the night even though they woke me up with their weed whacker at 7am the other morning so I say the hell with it and go to bed.

I love my truck :roll: and it obviously loves me :rotf:

 

[GM TURBO]

Re: I just love my truck (NOT!)

Did you end up using NGKs or Delco (I remember you talking about going NGK). The only reason I ask is I had better luck with the Delco plugs from a KR standpoint.

 

[Flyin Ryan]

Re: I just love my truck (NOT!)

left a tool in the engine bay ??

 

[GM TURBO]

Re: I just love my truck (NOT!)

I think the tool was behind the wheel

 

[Don W.]

Re: I just love my truck (NOT!)

Double check timing. Maybe the dist got moved while you were futzing with the cap. I say that because I actually found my dist loose because the fork thingy had come off the dist.

 

[Six-is-Enough]

Re: I just love my truck (NOT!)

fork thingy /QUOTE]


Is that what those things are called....I 'll be damn.

 

[myclone]

Re: I just love my truck (NOT!)

Did you end up using NGKs or Delco (I remember you talking about going NGK). The only reason I ask is I had better luck with the Delco plugs from a KR standpoint.

I used Delcos since I had them on the shelf. I bought 24 of em when the local chain store had them in stock when I asked on a whim. Shoulda seen the look on the guys face when I asked "how many you got?" and when he told me 24 I said "I'll take em all" :lol: .

Double check timing. Maybe the dist got moved while you were futzing with the cap. I say that because I actually found my dist loose because the fork thingy had come off the dist.

Nahhh..my dist hold down is tight enough you couldnt turn the distributor with the pipe wrench and a 2 foot cheater bar. If you can move a dist any amount with just your hands the hold down isnt tight enough.

Guys,
Think really hard about what I wrote to begin with...."revved it up in park" which means no load on the motor. With our motors it wouldnt detonate on 20 let alone 116 octane with no load/free revving so the KR isnt actual detonation its mechanical in nature. When I swapped in the 80E I had to do some messing with the fuel lines at the bellhousing and fabbing brackets so Im thinking the fuel lines are mushed and/or vibrating against the bellhousing or floor board causing it. Previously I could run 17psi on 93 with an occassional 2 deg of KR of shifts which is ok (IMO) so Im pretty sure everything is ok ignition/fuel wise.

When I get finished replacing the leaking pinion seal in the rear diff :roll: I'll tackle the false KR issue.

 

[bezerk]

Re: I just love my truck (NOT!)

could it be that you bent one of the stock heatshields on the exhaust manifolds, while getting to the plugs?.

 

[Don W.]

Re: I just love my truck (NOT!)

Nahhh..my dist hold down is tight enough you couldnt turn the distributor with the pipe wrench and a 2 foot cheater bar. If you can move a dist any amount with just your hands the hold down isnt tight enough.

Ya I can imagine. I brought it up only because I was just amazed when I finally got around to actually checking my timing after I bought the truck to discover the dist was just sittin' there with the hold down loose. I couldn't believe it.:roll:

 

[Stangbeater]

Re: I just love my truck (NOT!)

Did you check you chip? Mine had 18 deg. of KR in park also, my chip was about to fall out of the ECM. I reseated the chip and it went away.

Peace,

I used Delcos since I had them on the shelf. I bought 24 of em when the local chain store had them in stock when I asked on a whim. Shoulda seen the look on the guys face when I asked "how many you got?" and when he told me 24 I said "I'll take em all" :lol: .



Nahhh..my dist hold down is tight enough you couldnt turn the distributor with the pipe wrench and a 2 foot cheater bar. If you can move a dist any amount with just your hands the hold down isnt tight enough.

Guys,
Think really hard about what I wrote to begin with...."revved it up in park" which means no load on the motor. With our motors it wouldnt detonate on 20 let alone 116 octane with no load/free revving so the KR isnt actual detonation its mechanical in nature. When I swapped in the 80E I had to do some messing with the fuel lines at the bellhousing and fabbing brackets so Im thinking the fuel lines are mushed and/or vibrating against the bellhousing or floor board causing it. Previously I could run 17psi on 93 with an occassional 2 deg of KR of shifts which is ok (IMO) so Im pretty sure everything is ok ignition/fuel wise.

When I get finished replacing the leaking pinion seal in the rear diff :roll: I'll tackle the false KR issue.

 

[mattw]

Re: I just love my truck (NOT!)

At one point I had tried to use a metal chain as an engine tie down.. It was causing the exact same problem.. It would rattle as I reved my engine and cause a full 12 degrees of knock.

Good luck chasing down the problem..


-Matt