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Author Topic: engine issues  (Read 8932 times)

Offline screamin86

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engine issues
« on: September 10, 2009, 05:23:59 pm »
Alright well i believe the silvys ol 305 is finaly on its way out!i wanted to get some others opinions beforehand though.its never been a high oil psi monster always held 45 at most and 15-20 at lowest once warm idle in gear.past few days the psi hasnt been holding very high at idle like 5-8 but still climbs like normal at 25-30 cruise. Today going to work it felt very slugish. Got to moms and picked up some parts for one of my fbodys and came back out at started it up and im getting.a offbeat rattle like a pushrod not a consistant knock and im holing 10psi or so of preasure. I drove to work and it doesnt seem to get faster or lounder with rpm but i can still hear it. Any one got any sugestions other than its gone. If so that sucks but i i was planing on a build but not this soon! I really would like to have two 4x4s come winter time.
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline Captkaos

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Re: engine issues
« Reply #1 on: September 10, 2009, 05:29:24 pm »
5-8 at idle is normal, can you pinpoint where the noise is coming from?
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Offline DFAA

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Re: engine issues
« Reply #2 on: September 10, 2009, 05:34:26 pm »
Only need 10psi per 1000 RPM, but 5-8 at idle sounds pretty low. Could just be the oil pump. Check oil level also.
Get a length of hose and narrow down the location of the knock.
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Offline screamin86

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Re: engine issues
« Reply #3 on: September 10, 2009, 05:57:23 pm »
Im gona do more diagnostic tonight after work and see if i can narrow it down a little better! I had thought about changing the timing chain and oilpump for awhile but was waiting. My 82 ta with a stock crank turned stock rods and 030 flat tops and a stock replacemet melling pump not hv holds at minimum 25-30 hot idle and 55-60 cruise and 60+ wot.idk just worrys me since the truck seems to have lost power also. Im gona check it over tonight and tomarrow and see whats going on i supose.ive broken/bent pushrods on my fbodys b4 and it was similar but the oil preasure never droped at idle.
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline Marc

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Re: engine issues
« Reply #4 on: September 10, 2009, 07:33:27 pm »
IIRC if you be careful and disconnect one plug wire at a time, if the noise goes away when you pull a particular wire off you have isolated the problem to that cylinder, and it could be a rod bearing or wrist pin as it takes the strain off of it...I could be wrong though...the fact you lost lots of oil pressure at the same time as a knock came makes me think a rod bearing could be the issue...you could put a mechanical gauge on there to verify the dash gauge, and / or drain the oil and check for metal debris. 
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Offline screamin86

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Re: engine issues
« Reply #5 on: September 10, 2009, 07:43:23 pm »
Im using a mechanical gauge now! That was one of the first things i added when i bought the truck! I mean i didnt loose alot of psi but 5lbs or so.
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline VileZambonie

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Re: engine issues
« Reply #6 on: September 10, 2009, 08:02:01 pm »
Check your fluid levels, Pinpoint your noise and check your distributor/timing. Make sure the flexplate isn't loose or cracked.
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Offline screamin86

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Re: engine issues
« Reply #7 on: September 10, 2009, 08:34:30 pm »
It needs tuned bad i know that! I put a used 1406 carb on it and the timing hasnt been quite right and been getting around 8mpg but a freind from work that has had some bad family issues lately has my vac gauge and timming light and i wouldnt feel right asking for them back right now since he has been off work!
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline screamin86

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Re: engine issues
« Reply #8 on: September 11, 2009, 12:36:20 am »
alright i did what i could tonight in a local foodlion parking lot with my cousins assist. lol cold startup im getting about 40psi oil psi and then goes down to around 20 but i still got that godawful racket. pulled the pass side valvecover and everything is fine which i kinda asumed.it seems to drive fine like normal. i got to thinking that i am running open ypipe at the moment and i had retarded the timing a few days ago to run regular hehe so that could be my prob with lost power....but doesnt explain my drop of oil psi. anyway on the way home it never went below 22ish doin 55-60. took a right to go towards the house and oil psi droped to 0 then bck up so im thinking it could be either the pickup fell off or just low level. i know i konw i should have checked the level first tonight but i didnt think about it till after i already had it running. so im hoping/thinking that maybe its just low oil level or the pickup fell off causing the sudden drop or low oil preasure since come to think of it most of the time it read very low was on a incline or decline. the knock well im gona check my converter bolts and flexplate tomarrow before i tear into this thing. hopefully i dont gotta rebuild yet im still building my 383 for my car!
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline screamin86

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Re: engine issues
« Reply #9 on: September 11, 2009, 01:11:36 pm »
well i tried to inspect the flywheel and converter bolts and i dont see any cracks or have any converter to flywheel bolts and watching it idle nothing wobbles so idk  im lost. seems to be holding good oil psi for the most part though. never went below 25 and climbed with revs. i didnt let it warm up to its full heat but i let it run for about 5mins. im trying to upload a video but having problems.
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline VileZambonie

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Re: engine issues
« Reply #10 on: September 11, 2009, 10:45:16 pm »
So after all of this you still haven't even checked the oil level?  ???
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                         /  _ _ _\_
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              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline screamin86

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Re: engine issues
« Reply #11 on: September 12, 2009, 01:00:45 am »
I have and its where it should be!
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline screamin86

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Re: engine issues
« Reply #12 on: September 12, 2009, 01:43:34 am »
here is a video of the knock/rattle.

http://www.youtube.com/watch?v=3YbJ4j3xXao
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons

Offline joesgarage71

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Re: engine issues
« Reply #13 on: September 12, 2009, 02:46:14 am »
does this engine have a air pump on it?
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Offline screamin86

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Re: engine issues
« Reply #14 on: September 12, 2009, 10:14:04 am »
no it did at one time though. the previous owner removed all the emissions stuff and wiring. when i got it i swaped the carb to a non cc carb and had to redo the exhaust since ti wouldnt pass inspection around here with true duals and no cats.
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86 k10 lwb 4x4:350 .040 214/224 444/466 112lsa performer rpm 1406 lt's summit racing th350 2800stall
03 yukon xl:tint debadge full boltons
86 ta:lm7 hot cam boltons
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