Heres a challenge for you all! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86SILVERADO · 08-20-2003, 09:29 PM

O.K. I installed a new 350 in my truck about three months back. Ran O.K. but not the power gain I was expecting from going from my 305 to a 350. Motor went in and fired up without any real hangups except the fact that the throttle was stuck wide open (that story was in another post). Any way it ran real hot and real fast for a bit and I had to lean the carb way way out to make it run right which seemed strange but it worked so I went with it. The no power thing was killing me though. I had replaced all but like two vacuum lines I admit so I replaced the other two which seemed O.K. seemed to make a difference, not sure though. I have been having problems with my truck cutting out though especially on accerleration. choke is adjusted properly though and all vacuum hoses tight (brand new) new EGR and everything and I mean everything that should go along with a new motor. The truck would die anywhere and every where for no apparent reason and then it would be fine for a day or two and then all of a sudden it would choke again. This was really driving me crazy! To the point where I almost gave up on the truck! I even replaced the tranny with a good 350 that I had from another truck that I wrecked a while back but no go. still running one day and then not the next and then power and then none and on and on it went...until today! Any guesses?

**old Rusty C10** · 08-20-2003, 09:39 PM

distributor? pickup coil? pinched wire somewhere/

86SILVERADO · 08-20-2003, 09:59 PM

All wiring was checked and re-checked. Distributor was not kitted but cleaned and inspected scrupulously with new coil installed. Timing set at 10 btdc. BY the way after all this rigamarole I am really looking forward to cruising in my new 67 dually with two feet of vacuum hose as opposed to two hundred, MANUAL choke! Four speed STANDARD trans! No AC! No computer! No TPS, EGR, TCV, PCV, TCM, ESC, ETC!!! Incidentally the problem was due to none of the above!

But I hate em all anyway!

86SILVERADO · 08-24-2003, 09:45 PM

Geeeeez, thumbs up to Bob for being the only one who was not afraid to be wrong! I thought this would be fun. Apparently not.

Anyway, for anyone who cares, when I put the motor back in I didn't find the giant mouse nest that had been built inside the accordian duct attached to the air cleaner housing! If you can believe it, an entire family of mice had been living in there and they would re-build the nest at night after I had sucked a hole through it after driving around each day. This was why the the truck had been sometimes rough running and sometimes cutting out and sometines running fine. Afier the mouse nest tumbled out the other day when I actually took off the housing to dump out a rather large clump of grass it ran fine (after I re-adjusted the carb so it could actually get some fuel now that it was finally getting some air) I had actually been finding little bits of grass in the housing now and then and kept cleaning them out but didn't really think anything of it because I live down a long dirt road and there are alot of hay fields on the property. Live and learn. So next time any of you guys are having trouble with a fresh re-build. After you have pulled your hair out and torn down the motor for the second or third time, remember to remove the mouse nest so your new engine can actually breath, and all will be well.

By the way, now I do notice the difference between my 350 and the 305 and I like it!

87 STEPPER · 08-24-2003, 10:02 PM

Hummmm!

May be you should check the airfilter inlet tube for a mouse or bird nest or some other sort of obstruction.

That's all i can think of

86SILVERADO · 09-04-2003, 08:37 PM

O.K. so it wasn't the mouse nest after all. Truck has still been cutting out at will. So....... I tried the ESC bypass trick today and it seems to have made a difference but we will have to give it a few more days to be sure. Wish me luck... And thanks to Mike and 86 Scottsdale for the helpful info.

Russell · 09-05-2003, 12:16 AM

86 -- Do a compression check, and clean off your plugs...

I did that to my truck tonight which was experiencing similar symptoms, and now it runs like a real V8, you shoulda hear me giggle like a little school girl at the roar that truck makes now, lol

86SILVERADO · 09-05-2003, 06:02 PM

Hey Russel, Thats funny....Before I spliced the esc wires I did a compression check and put new plugs in it as well. 150 to 160 on all cylinders and plugs were a little carboned up from the break in but nothing out of the ordinary. I was gonna put a new set in for the hell of it and maybe now I will since you mentioned it...LOL
Thanks and I am posting some pics of my "new" 67 dually on the pics section if any one is interested.

Later..

Norris

08-20-2003, 09:29 PM	#1
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	Heres a challenge for you all! O.K. I installed a new 350 in my truck about three months back. Ran O.K. but not the power gain I was expecting from going from my 305 to a 350. Motor went in and fired up without any real hangups except the fact that the throttle was stuck wide open (that story was in another post). Any way it ran real hot and real fast for a bit and I had to lean the carb way way out to make it run right which seemed strange but it worked so I went with it. The no power thing was killing me though. I had replaced all but like two vacuum lines I admit so I replaced the other two which seemed O.K. seemed to make a difference, not sure though. I have been having problems with my truck cutting out though especially on accerleration. choke is adjusted properly though and all vacuum hoses tight (brand new) new EGR and everything and I mean everything that should go along with a new motor. The truck would die anywhere and every where for no apparent reason and then it would be fine for a day or two and then all of a sudden it would choke again. This was really driving me crazy! To the point where I almost gave up on the truck! I even replaced the tranny with a good 350 that I had from another truck that I wrecked a while back but no go. still running one day and then not the next and then power and then none and on and on it went...until today! Any guesses?

08-20-2003, 09:39 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	distributor? pickup coil? pinched wire somewhere/ __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

08-20-2003, 09:59 PM	#3
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	All wiring was checked and re-checked. Distributor was not kitted but cleaned and inspected scrupulously with new coil installed. Timing set at 10 btdc. BY the way after all this rigamarole I am really looking forward to cruising in my new 67 dually with two feet of vacuum hose as opposed to two hundred, MANUAL choke! Four speed STANDARD trans! No AC! No computer! No TPS, EGR, TCV, PCV, TCM, ESC, ETC!!! Incidentally the problem was due to none of the above! But I hate em all anyway! __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

08-24-2003, 10:02 PM	#5
87 STEPPER STILL PLAYS WITH TRUX Join Date: Nov 2002 Location: Melbourne, Fla. Posts: 2,764	Hummmm! May be you should check the airfilter inlet tube for a mouse or bird nest or some other sort of obstruction. That's all i can think of __________________ ~~Bruce~~ MY 87 STEPPER MY 99 2D/WD TAHOE

09-05-2003, 12:16 AM	#7
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	86 -- Do a compression check, and clean off your plugs... I did that to my truck tonight which was experiencing similar symptoms, and now it runs like a real V8, you shoulda hear me giggle like a little school girl at the roar that truck makes now, lol __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

08-24-2003, 09:45 PM	#4
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	Geeeeez, thumbs up to Bob for being the only one who was not afraid to be wrong! I thought this would be fun. Apparently not. Anyway, for anyone who cares, when I put the motor back in I didn't find the giant mouse nest that had been built inside the accordian duct attached to the air cleaner housing! If you can believe it, an entire family of mice had been living in there and they would re-build the nest at night after I had sucked a hole through it after driving around each day. This was why the the truck had been sometimes rough running and sometimes cutting out and sometines running fine. Afier the mouse nest tumbled out the other day when I actually took off the housing to dump out a rather large clump of grass it ran fine (after I re-adjusted the carb so it could actually get some fuel now that it was finally getting some air) I had actually been finding little bits of grass in the housing now and then and kept cleaning them out but didn't really think anything of it because I live down a long dirt road and there are alot of hay fields on the property. Live and learn. So next time any of you guys are having trouble with a fresh re-build. After you have pulled your hair out and torn down the motor for the second or third time, remember to remove the mouse nest so your new engine can actually breath, and all will be well. By the way, now I do notice the difference between my 350 and the 305 and I like it!

09-04-2003, 08:37 PM	#6
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	O.K. so it wasn't the mouse nest after all. Truck has still been cutting out at will. So....... I tried the ESC bypass trick today and it seems to have made a difference but we will have to give it a few more days to be sure. Wish me luck... And thanks to Mike and 86 Scottsdale for the helpful info.

09-05-2003, 06:02 PM	#8
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	Hey Russel, Thats funny....Before I spliced the esc wires I did a compression check and put new plugs in it as well. 150 to 160 on all cylinders and plugs were a little carboned up from the break in but nothing out of the ordinary. I was gonna put a new set in for the hell of it and maybe now I will since you mentioned it...LOL Thanks and I am posting some pics of my "new" 67 dually on the pics section if any one is interested. Later.. Norris __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

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