Why is my motor bogging down? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mrtn15 · 11-16-2010, 07:21 PM

I have a 1986 chevy silverado 305 or 350 motor with turbo350 tranny! And when I'm going about 65 down the highway and gas on it. It seems like it sputters or bogs down very fast and many times. And it makes my truck speed up slow down speed up slow down
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hugger6933 · 11-16-2010, 09:14 PM

First check the state of tune plugs, wires, cap, rotor. then check for clogged fuel filter then check for fuel pressure if you have'nt found after all that try a known good carb, to rule out clogged jets or intermedite curcuits. Also put a vac gauge on it run it to duplicate the problem and watch the vac to see if it drops that would indicate a clog in your exhaust system. Jim

77shortstep · 11-16-2010, 09:23 PM

I would start with the fuel filter, then plugs cap and rotor which never hurts unless you have recently replaced them. Also if you know where a good reliable carb is it would be easy enough to switch and test.
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rollinhard · 11-17-2010, 09:19 AM

Poor some menthal hydrate in the tank. Might be water in the gas aswell. My 86 305 would bog and sputter and be screwy untill I poored some in then its was good after that. Its had sat for quite a while before I got it and the cat was rotted inside aswell cut that out and made big diff aswell. Couple suggestions to try also.
Curtis
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willett · 11-17-2010, 09:58 AM

i agree with checking yout fuel filter fuel filter first, its cheap and easy to do.

Mrtn15 · 11-23-2010, 05:16 PM

Thanks to all of you! I will try them, I replaced cap and rotor this weekend
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RED-85-Z51 · 11-23-2010, 05:19 PM

A failing EGR valve on a carbed engine can do weird things

11-16-2010, 07:21 PM	#1
Mrtn15 Registered User Join Date: Oct 2010 Location: Edgewood Texas Posts: 272	Why is my motor bogging down? I have a 1986 chevy silverado 305 or 350 motor with turbo350 tranny! And when I'm going about 65 down the highway and gas on it. It seems like it sputters or bogs down very fast and many times. And it makes my truck speed up slow down speed up slow down Posted via Mobile Device

11-16-2010, 09:14 PM	#2
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,280	Re: Why is my motor bogging down? First check the state of tune plugs, wires, cap, rotor. then check for clogged fuel filter then check for fuel pressure if you have'nt found after all that try a known good carb, to rule out clogged jets or intermedite curcuits. Also put a vac gauge on it run it to duplicate the problem and watch the vac to see if it drops that would indicate a clog in your exhaust system. Jim

11-16-2010, 09:23 PM	#3
77shortstep Registered User Join Date: Nov 2009 Location: Lebanon, MO Posts: 215	Re: Why is my motor bogging down? I would start with the fuel filter, then plugs cap and rotor which never hurts unless you have recently replaced them. Also if you know where a good reliable carb is it would be easy enough to switch and test. Posted via Mobile Device __________________ 77 CHEVY - SHORT BED STEP SIDE 2WD 02 CHEVY - EXT CAB SHORT BED Z71 7 INCHES OF LIFT

11-17-2010, 09:19 AM	#4
rollinhard Registered User Join Date: Jun 2010 Location: British Columbia Posts: 192	Re: Why is my motor bogging down? Poor some menthal hydrate in the tank. Might be water in the gas aswell. My 86 305 would bog and sputter and be screwy untill I poored some in then its was good after that. Its had sat for quite a while before I got it and the cat was rotted inside aswell cut that out and made big diff aswell. Couple suggestions to try also. Curtis Posted via Mobile Device __________________ If you can't impress them with your inteligence, dazzle'm with your stupidity 1969 GMC lwb 2wheel drive can you say big stroker motor to come hehe

11-17-2010, 09:58 AM	#5
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: Why is my motor bogging down? i agree with checking yout fuel filter fuel filter first, its cheap and easy to do. __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"

11-23-2010, 05:16 PM	#6
Mrtn15 Registered User Join Date: Oct 2010 Location: Edgewood Texas Posts: 272	Re: Why is my motor bogging down? Thanks to all of you! I will try them, I replaced cap and rotor this weekend Posted via Mobile Device

11-23-2010, 05:19 PM	#7
RED-85-Z51 Registered User Join Date: Nov 2010 Location: Pensacola, FL Posts: 15	Re: Why is my motor bogging down? A failing EGR valve on a carbed engine can do weird things



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