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Tractor Talk Discussion Forum

O/T 87 chevy pickup

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Angle Iron

11-08-2005 13:06:05




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My sons 87 chevy 4x4 350 throttle body injection is giving us a fit. It starts cold and runs and pulls great. If he shuts it off for a couple minutes and restarts it its fine. Let it set 15 to 30 minutes and it spins over fine but won't start. If we give it a drink of gas it starts right up and dies as soon as the little gas we poured in is gone. If he gives it a drink then does a dance on the accelerator to slowly build some rpms it will stay running after a try or two. It's still running kinda lean for a minute or so then runs and pulls like nothing was ever wrong. I would think that the computer is not sending gas when this happens and that it is a bad sensor. The problem is we don't know which one or how to check to determine whats wrong. I don't know anything about these kinds of cpu controls.
Thanks for any help you can give.
Angle Iron

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Angle Iron

11-10-2005 03:51:29




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
Thanks for all the help. We will try to get it fixed in the next few weeks.
Angle Iron



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deanop

11-09-2005 17:15:04




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
fuel pump..... ..... ..... ..... ..... .....



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Cosmo

11-09-2005 14:59:11




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
I posted this a few days ago during another discussion. Hope it helps. "After two independent mechanics gave up trying to find out why my 88 Chev. pickumup was so cold natured, I tucked my tail between my legs and went to the dealer. He replaced all sensors he could think of. Replaced fuel pump. (all these he pulled back off/out). Finally, after keeping it for several weeks, he checked the running fuel pressure. Found regulator spring broke. $300 plus for a two dollar spring. This from a man with 20 years GM experience."

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Jeff IA

11-09-2005 13:08:15




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
Try fuel filter first, then the fuel pump. Marginal but still in-spec fuel pressure can give you trouble. Common problem for that vintage Chevy.



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Bob

11-08-2005 22:11:52




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
It is likely a fuel pressure problem, or an ignition/ECM problem that is agravated by heat, but start with the simple things first...

Check the distibutor cap and rotor for a bunch of white/green deposits, and also check the continuity of the coil wire, and verify that it is attached securely at both ends.



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DRL

11-08-2005 18:25:29




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
Then there is the throttle position sensor, the map sensor, etc. Might pay to get a repair manual for your truck to find how to check each of these and the sequence in which to check them. Had a 91 S10 that acted like it was starving for fuel. Would start and idle just fine, but RPM's would slow down and die. Wouldn'd run at all under load. Found that the fuel pressure was non existent. Wasn't the fuel pump, but the short piece of rubber hose split that connects the fuel pump to the fuel line. Since I had the fuel tank pulled off and opened up, I replaced the fuel pump anyway.

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Fern(Mi)

11-08-2005 16:59:57




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
Got some your same problems with same truck. I have two gas tanks one with new fuel pump last Winter. Been suggested I check out for clicking sound a oil pressure bypassing relay on engine room firewall. If no sound replace. If none functioning engine wont staart until oil presure reaches 11#'s.
Good luck too both of us.
Fernan

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RusselAZ

11-08-2005 17:34:46




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 Re: O/T 87 chevy pickup in reply to Fern(Mi), 11-08-2005 16:59:57  
Not so. The oil pressure switch is a redundent back up. These are in the system to keep the vehicle running until shut down if the main relay fails. It does not need oil pressure to turn on the fuel pump.

There is a tap wire in the loom to use for checking fuel pressure and delivery. Put 12 volt on this from the battery and listen for the pump.

Fuel injected systems that do what the poster related his is doing probably have a bad pump. When the pump doesn't put out enough pressure to bypass the regulator to the tank they do the same thing as vapor lock.

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Fern(Mi)

11-09-2005 16:30:28




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 Re: O/T 87 chevy pickup in reply to RusselAZ, 11-08-2005 17:34:46  
I never said relay turned on fuel pump. I was told relay has something to do with momentarily operating fuel injector until oil preasure comes up. That"s as I understood oit. I figure a simple check here would save me a lot of grief.

Something else might be checked are grounds. Have had ground failers with other vehicles I have driven to death.
Fernan



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Mike in Ind.

11-08-2005 16:23:38




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 Re: O/T 87 chevy pickup in reply to Angle Iron, 11-08-2005 13:06:05  
Sounds to me like the fuel pump itself is giving out. Had several cars and trucks at the shop I used to work at act like that and the pump was going bad. Mike.



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Hoosier JD

11-08-2005 17:35:01




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 Re: O/T 87 chevy pickup in reply to Mike in Ind., 11-08-2005 16:23:38  
We had injectors go bad that caused similar problems. We changed them and the problem went away. They do fit down in there a certain way...learned the hard way. Good luck. Mike



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tompepper

11-08-2005 17:45:00




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 Re: O/T 87 chevy pickup in reply to Hoosier JD, 11-08-2005 17:35:01  
I believe it"s on the right side of the block below the exh manifold .it kind of looks like an oil pressure swithch.they call it an anti knock sensor.this sensor controls fuel flow by monitoring the engige for wrist pin noise.when you give it fuel and it senses a clatter it adjust the fuel .this will cause problems like you are having.



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Bob

11-08-2005 22:06:36




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 Re: O/T 87 chevy pickup in reply to tompepper, 11-08-2005 17:45:00  
The knock sensor affects the ignition TIMING, not the fuel rate.



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