Ripping the 5.0 tonight

[Justshootme84]

Adam, have you checked the timing? Just curious if yo might be getting some pre-detonation, or perhaps have some carbon build-ip in the cylinders. My 98 Z-71 used to have that problem. Now and then, a piece of carbon would flake off, and knock about on top of the piston until it burned off. I started using techron injector cleaner and quit buying gas from certain stations (Texaco being one of them), and haven't had that problem in a few years now. JSM84

 

[AdamDude04]

Havnt checked timing, but that is however, on my list. I didn't know anything at all, other than how to check oil and tire pressure until about 4yrs ago. At that point, I think I've learned a lot, but only from experince, or problems I read about on the forums. Needless to say, I think I know quite a bit, however I still have a lot to learn (hence why I'm on a forum and doing the work myself, vs paying a mechanic to do it for me!!)

I'll have to run the truck for a couple hundred miles if nothing breaks, and hope it may be carbon build up. In December, my girlfriend and I put nearly 5k miles on the Bronco. I always run Safeway fuel in my truck, and thankfully in CA there was Safeway fuel there..but on the drive out to CA and WA it was Cheveron. Perhaps four different days of constant driving (20+hrs) and 5k miles on the motor in 30 days, that was a lot of stress on a motor that already had 311k.

How about this one guys,

"Spark knock".. I don't have the spark plug wire separtors.. and I know about the two wires on each side must be ran away from eachother (2&4, 5&7 or something like that) or you'll get an arch.. I've heard the term "spark knock" before.. think this applies to me? About to head out into the garage to put the intake back on the motor and fix the plastic vaccume hose I broke, ugh. I'll be back on later tonight in hopes for some thoughts from ya'll!

 

[Justshootme84]

If two plug wires are arcing, you'll see it at night when you run the motor. Look for a blue spark, just like when you check for fire with a plug out. Not sure about your area, but the Chevron stations here in TX have the Techron added to the gas already, before you even pump it into your tank.

 

[89BRONCOXLT.H.O5.0]

Yeah everything under the cover seems to be in place. I tried hitting all of them with a rubber hammer to see if I could notice anything abnormal, but everything sounded fine.

I'll be putting it back together in an hour or so..

But here's the problem.. the knocking noise is VERY random. You don't hear it upon startup.. usually takes a couple minutes until it starts. But like I said, problem is, it's very random. Sometimes it'll go 20-30 minutes without knocking (knocking only lasts 3-50 seconds) or sometimes it'll knock every 2 minutes.

So how long can I run the motor without the belt?

Also, I assume if the knocking is comming from lets say the alternator pulley.. with the belt off, if it was going out, would there be any grinding or resistance when turning the pulley by hand?

Hey adamdude you could probably run the truck without the belt till the battery dies, i know one thing about broncos, they deffinitly are nothing like chevys. oh, im just learning how to use this site thats why i had to say something, I can tell you if for some reason that motor should choke and die, you can do what i did, my 89xlt 5.0 oil pump went out and well being out close to nowhere with a broken leg i drove it about a mile to the closes phone. well about 600bucks later and my bronco ran like crap. no smoking overheating or nothing, it just ran rough, well i figured time for tune up, so took it to shop where family takes company trucks, also had him put on my new flowmaster muffler, well after he did the muffler he checked out my truck before tune up because of how i said it was running, come to find out num 5 cyl half comp and num 6 none, no need for that tune up found a 5.0 for 300 in a 66 ranchero still able to hear it run so i did. it was carbed and it ran smooth no rattles taps or whatever, i got it. well drove from phx to cali so my pops could work his magic. come to find out he tells me it he's impressed what i got for 300 was the H.O 5.0 mustang motor. the H.o mustangs have the same firing order as the broncos. the reg mustang 5.0 have different firing order. my truck is more responsive and gets better gas milage.

 

[83 bronc]

if It's not spun main bearing..wich would ****!! you might check that their is sufficiant power to the coil and distributer you know check all connections to be tight especially if you loose power when driving while its knock, knock, knocking..

 

[AdamDude04]

Well I ripped the upper intake off the truck to find a knock problem. Got everything put back together, turned it on, and it runs like crap! Very ruogh, and if your hand up to the exhaust, there isnt a constant exhaust flow like normal. I think I got two spark wires mixed up.. because when I took the intake off, two plug wires came off with it. I put them back in place, thinking that was the correct area..

So either two wires are mixed up, making it run like crap.. or something else is major wrong. Anyone have a distrubtor cap diagram on which plug goes to which wire and where it connects to on the cap??

Thanks

 

[92broncomann]

b-( Oh. Well maybe you go buy a Haynes or Chiltons manual?????

It's not that big of a deal dude, or just unplug the two wires you removed and switch them around......

92BM

 

[green streak]

I stole this from Miesk5 last month.

http://www.supermotors.net/clubs/superford/registry/media/470416

 

[AdamDude04]

b-( Oh. Well maybe you go buy a Haynes or Chiltons manual?????

It's not that big of a deal dude, or just unplug the two wires you removed and switch them around......

92BM

I have one actually.. it just tells me how to remove the thing. Not hwo the wires are setup on the cap

Before I go unpluging wires.. I'd rather just know the answer and do it right the first time. I forgot what two wires were unpluged..so 8 wires, that's a lot of choices and combos...

 

[AdamDude04]

I stole this from Miesk5 last month.

http://www.supermotors.net/clubs/superford/registry/media/470416

Thank you..that's what I was looking for but couldnt find it while searching

 

[Justshootme84]

Mark the firing order on you intake, cowl or somwhere where you can easily see it with a magic marker. that's what I like about VW engines, they have the fiting otder stamped on the engine right there where you need it. Couner-clocklwise, for your 89 5.0L:

1-5-4-2-6-3-7-8

And it is listed on page 2B-2 in the Haynes manual.

 

[50joe]

Running the truck without the belt untill the battery dies is not only a terrible rookie idea, but could be a costly one as well. Not only does the water pump circulate the coolant to keep the engine at a required temp, it also helps keep the block and heads at the same temp. An engine block running at 210 with heads running at 160 can cause not only gasket failure, but also warpage, AND IS NOT RECCOMENDED BY ANY PROFESSIONAL!!!!!!

 

[AdamDude04]

Running the truck without the belt untill the battery dies is not only a terrible rookie idea, but could be a costly one as well. Not only does the water pump circulate the coolant to keep the engine at a required temp, it also helps keep the block and heads at the same temp. An engine block running at 210 with heads running at 160 can cause not only gasket failure, but also warpage, AND IS NOT RECCOMENDED BY ANY PROFESSIONAL!!!!!!

Yeah I figured as much..I know running the truck for a minute or so is fine as finding the source of certain problems.. and I'd figured running it until it dies is a pretty bad idea but never done it, or heard of it before, there for I'd never try it first hand LOL

Also.. the photo with how the cap/wire/plugs are setup in the shop manual.. mine isn't set up like that at all!! But I got it running to where it purrs like before.

IIRC, pin 1 goes to cyl 1, pin 2 goes to cly 8 (or 4..but its on the other side of the motor!)...

 

[AdamDude04]

So last night I drove the bronco to my buddies house.. (about 20 miles one way). The knocking noise didn't like it one bit. It was a heck of a lot more constant than before, tho still random on when it would knock, but made it easier to look for the source..

So I put my hand (in the dark, don't recomend it!) on the alternator..didn't really feel anything. Put it on the Belt Tensioner and I could feel quite a bit of banging around..not the peice itself moving but more like vibrations in it. So I think I may have found my problem..the pulley.

Anywho, going to replace the pulley today and see if that fixes the issue. I don't think I need a new belt tensioner itself, as when I replaced the belt less than a month ago, it was stong as all heck and requires a lot of pressure to get the belt off.

Anyway, we'll see!

 

[89BRONCOXLT.H.O5.0]

So last night I drove the bronco to my buddies house.. (about 20 miles one way). The knocking noise didn't like it one bit. It was a heck of a lot more constant than before, tho still random on when it would knock, but made it easier to look for the source..

So I put my hand (in the dark, don't recomend it!) on the alternator..didn't really feel anything. Put it on the Belt Tensioner and I could feel quite a bit of banging around..not the peice itself moving but more like vibrations in it. So I think I may have found my problem..the pulley.

Anywho, going to replace the pulley today and see if that fixes the issue. I don't think I need a new belt tensioner itself, as when I replaced the belt less than a month ago, it was stong as all heck and requires a lot of pressure to get the belt off.

Anyway, we'll see!

Hey Brother I was being a little stupid the other night when I said run it till it dies, first time trying this internet chat thing and didnt know what to say, I didnt think anybody would run there ride till it shut down. **** I really hope you solve your problem, I need to find away to bypass the RABS deal on my 89 Bronco, after a few stop lights and I can feel the dragging, like a vw is holding on to my bumper and has flat tires, park for 10 or 15 mins and its good again, If somebody knows how please let me know. there was a site a few days ago and a guy said he used somethings from pepboys to conect the brake lines after disconnecting them from the RABS deal under the truck attatched to the framerail i think, if I new for sure what and how he did it. that would be my next project this weekend. No more none sense, and once again I apoligize for bumpin gums before. Thanks, BIG DOG