87 sputtering acceleration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wlf89 · 02-05-2015, 09:40 AM

bought a 87 truck with 305 that has been sitting for several years, so far i have put a new fuel pump and tank, and a tune up. it will sit there and idle good but when you start to take off and pushing gas 1/8to1/4 it has a sputter and sometimes will die, but when you push gas further it will smooth out and take gas good.

bhuffstutter · 02-05-2015, 06:46 PM

Have you rebuilt the carb?

RUN GMC · 02-05-2015, 08:41 PM

If it is fuel injected.....i would check the fuel lines if rubber to see if they are mushy the insides will choke off fuel at times after sitting for a long time.....also did you change out the fuel sock they can get weak and choke off the suction.........

greg64 · 02-05-2015, 08:51 PM

How about the fuel filter being bunged up? I'd think an 87 would be TBI. If so, check to see if any codes are set on the computer. Could possibly be the throttle position sensor that's bad (akin to a defective accelerate pump on a carb).

wlf89 · 02-05-2015, 09:56 PM

Quote:

Originally Posted by greg64

How about the fuel filter being bunged up? I'd think an 87 would be TBI. If so, check to see if any codes are set on the computer. Could possibly be the throttle position sensor that's bad (akin to a defective accelerate pump on a carb).

yes, it is tbi.
i have changed the fuel filter, hoses, and the pump sock.

**old Rusty C10** · 02-06-2015, 09:01 AM

clean out the tbi good probably some junk in there

badchevy · 02-06-2015, 10:28 AM

My 87 also sat for a couple of years and does the same thing as yours. I have done the same things you have to yours and it still sputters upon acceleration. Mine got a little better after I blocked off the vacuum line going to the cruise control. I also got a "check engine" light come on and a 33 code showed up. It's for the IAC but every test I performed shows it's good. Might still replace mine just to see if that fixes it.

ZacharyDouglas1992 · 02-09-2015, 04:59 PM

1)Throttle body base Gasket

2)EGR (you can test this by removing the vacuum line and plugging it. If the sputtering stops, there was your issue. may cause your light to come on.

3)Idle Air Control Valve- as someone above posted, I tested my original one and it checked out, but on a whim replaced it anyways and it made a huge difference.

badchevy · 02-15-2015, 08:14 PM

Just an update for you. I got a used IAC and installed it on my truck. Although I have only taken it out once, the truck seems to be driving a lot better and not cutting out like it used to. I will need to take it out for a good long drive to see if it really fixed the problem or not. Will keep you posted.

wlf89 · 03-07-2015, 09:50 AM

i replaced the tps because mine checked to be bad, and it was throwing a 13 oxygen sensor code and that also said check the tps sensor, but it didnt change the way it ran one bit that i could tell.

02-05-2015, 09:40 AM	#1
wlf89 69 c/10 lwb fleetside Join Date: Jul 2004 Location: saint joseph TN Posts: 195	87 sputtering acceleration bought a 87 truck with 305 that has been sitting for several years, so far i have put a new fuel pump and tank, and a tune up. it will sit there and idle good but when you start to take off and pushing gas 1/8to1/4 it has a sputter and sometimes will die, but when you push gas further it will smooth out and take gas good. __________________ 69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed

02-05-2015, 06:46 PM	#2
bhuffstutter Registered User Join Date: Dec 2014 Location: Olympia Wa Posts: 2	Re: 87 sputtering acceleration Have you rebuilt the carb?

02-05-2015, 08:41 PM	#3
RUN GMC Registered User Join Date: May 2014 Location: North AL Posts: 363	Re: 87 sputtering acceleration If it is fuel injected.....i would check the fuel lines if rubber to see if they are mushy the insides will choke off fuel at times after sitting for a long time.....also did you change out the fuel sock they can get weak and choke off the suction......... __________________ http://i204.photobucket.com/albums/b...baae5d9a7e.jpg

02-05-2015, 08:51 PM	#4
greg64 Registered User Join Date: Dec 2007 Location: Kimberley, BC, Canada Posts: 799	Re: 87 sputtering acceleration How about the fuel filter being bunged up? I'd think an 87 would be TBI. If so, check to see if any codes are set on the computer. Could possibly be the throttle position sensor that's bad (akin to a defective accelerate pump on a carb). __________________ Greg 64 GMC Suburban - 283, NV3500, 14 bolt 77 C10 swb - 292, SM465, 12 bolt

02-06-2015, 09:01 AM	#6
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: 87 sputtering acceleration clean out the tbi good probably some junk in there __________________ 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!!

02-06-2015, 10:28 AM	#7
badchevy Registered User Join Date: May 2010 Location: San Antonio, TX Posts: 102	Re: 87 sputtering acceleration My 87 also sat for a couple of years and does the same thing as yours. I have done the same things you have to yours and it still sputters upon acceleration. Mine got a little better after I blocked off the vacuum line going to the cruise control. I also got a "check engine" light come on and a 33 code showed up. It's for the IAC but every test I performed shows it's good. Might still replace mine just to see if that fixes it.

02-09-2015, 04:59 PM	#8
ZacharyDouglas1992 Registered User Join Date: Nov 2013 Location: Fowler California Posts: 140	Re: 87 sputtering acceleration 1)Throttle body base Gasket 2)EGR (you can test this by removing the vacuum line and plugging it. If the sputtering stops, there was your issue. may cause your light to come on. 3)Idle Air Control Valve- as someone above posted, I tested my original one and it checked out, but on a whim replaced it anyways and it made a huge difference. __________________ 1967 CHEVELLE MALIBU 427/700R4 1971 CHEYENNE 10 350/350 1983 GMC K3500 454/400/205 1987 R10 TBI 350/700R4 2014 CRUZE 2.0 TURBO DIESEL

02-15-2015, 08:14 PM	#9
badchevy Registered User Join Date: May 2010 Location: San Antonio, TX Posts: 102	Re: 87 sputtering acceleration Just an update for you. I got a used IAC and installed it on my truck. Although I have only taken it out once, the truck seems to be driving a lot better and not cutting out like it used to. I will need to take it out for a good long drive to see if it really fixed the problem or not. Will keep you posted.

03-07-2015, 09:50 AM	#10
wlf89 69 c/10 lwb fleetside Join Date: Jul 2004 Location: saint joseph TN Posts: 195	Re: 87 sputtering acceleration i replaced the tps because mine checked to be bad, and it was throwing a 13 oxygen sensor code and that also said check the tps sensor, but it didnt change the way it ran one bit that i could tell. __________________ 69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed

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