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MustangLover1993
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Jun 20, 2011, 11:09 PM
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1989 Chevy help
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Hi I have an 89 chevy silverado 5.7 half ton pickup with 350 engine and It has over 210,000 miles. I have replaced the fuel pump,o2 sensor,throttle position sensor, catalytic converter, replaced gasket between manifold and carb.Ran sea foam through and it idles perfect but at first when I'm driving it it will be fine but when it starts getting to operating temp. it starts to putter and want to die when I give it any gas???
(This post was edited by MustangLover1993 on Jun 20, 2011, 11:25 PM)
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Mojoman
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Jun 23, 2011, 12:51 AM
Post #2 of 7
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Re: 1989 Chevy help
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Sounds like you might be dealing with an electrical problem with the spark ignition. Are your plugs in good shape? if so does you coil (i take it it might be using a coil for it age) get extremely hot? If it does, you might need to add a resistor to it. Try to replace the capacitor that sits right by the distributor and connects to your points. Try that, if fails, send me an email: Personal info deleted i'll try to help you the best i can
(This post was edited by Hammer Time on Jun 23, 2011, 3:51 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 23, 2011, 3:37 AM
Post #3 of 7
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Re: 1989 Chevy help
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Mustanglover1993: At the age and miles all vacuum items, valve timing, compression should be checked out. This should be TBI = throttle body fuel injected not a carb.
In that it runs ok cold and not warmed up the injectors may not be getting the right signals as to what the engine temp is thru the CTS = coolant temp sensor or need cleaning/replacement.
It's open to a lot of possibilities.
Correct me if wrong but I couldn't find the nameplate "Silverado" used in 1989 nor a carburetor? Is there a typo there with the model year?
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 23, 2011, 3:57 AM
Post #4 of 7
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Re: 1989 Chevy help
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Sounds like you might be dealing with an electrical problem with the spark ignition. Are your plugs in good shape? if so does you coil (i take it it might be using a coil for it age) get extremely hot? If it does, you might need to add a resistor to it. Try to replace the capacitor that sits right by the distributor and connects to your points. Try that, if fails, send me an email: Personal info deleted i'll try to help you the best i can
Mojoman, Please refrain from giving advice on subjects that you are not experienced in at all.
This is a fuel injected, computer controlled engine and it certainly doesn't have any points, resisters or capacitors.
Also, all contact and advice has to be posted in the open forum. Do not post any personal contact info.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MustangLover1993
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Jun 24, 2011, 12:38 AM
Post #5 of 7
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Re: 1989 Chevy help
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Sorry its a typo on it being carb its throttle body and its definitely a silverado. So would it be an electrical problem or a mechanical?
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Tom Greenleaf
Ultimate Carjunky
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Jun 24, 2011, 7:44 AM
Post #6 of 7
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Re: 1989 Chevy help
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210,000 miles on a 1989 truck could be lots of possible things. Vacuum issues sending wrong info as to how much fuel to deliver could be one of many causes. It runs well cold as you said so I'd be chasing down temp sensing items first.
Then I'd check for manifold actual vacuum which should be close to 18Hg or so and steady,
T
(This post was edited by Tom Greenleaf on Jun 24, 2011, 7:46 AM)
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John Dep
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Sep 1, 2011, 8:55 PM
Post #7 of 7
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Re: 1989 Chevy help
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Check out your EGR valve or vacuum lines leading to your EGR valve. If you have never replaced the EGR or the vacuum lines. It would be a good idea to do it any how.
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