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Chevrolet r1500: 87 chevy pickup with a 350 tbi...I have injector…

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87 chevy pickup with a...
87 chevy pickup with a 350 tbi...I have injector pulse and food fuel pressure but no spark. Have replaced coil new wires rotor cap and plugs
Submitted: 3 years ago.Category: Chevy
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Customer reply replied 3 years ago
Hello??
Answered in 1 hour by:
5/23/2015
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19,452
Experience: ASE Master Certification. GM World Class Certification
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Hello and thank you for trusting me with your question. My name is ***** ***** I will do my best to help you with your Chevy problem.
Do you have voltage to the pink wire at the coil with the key in the on position?
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Customer reply replied 3 years ago
Yup
Customer reply replied 3 years ago
I assume with injector pulse that the new module is working and recieving the signal from pickup cool right?? My next guess would be pickup coil but I'm not convinced
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
So the ignition control module in the distributor has been replaced?
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Customer reply replied 3 years ago
Replaced the icm, coil, wires, rotor bug and cap
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
If you have injector pulse then the pickup coil and icm should be operational. Connect test light across pink and white wires at the coil and crank the engine. Light should flash, does it?
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Customer reply replied 3 years ago
Nope
Customer reply replied 3 years ago
Wait a sec. What do you mean connect test light across the white and pink wires? I know your talking about plug at coil but how do you lay test light??
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
Connect clip of test light to pink wire and probe of test light to white wire. Then crank the engine and look for the light to flash.
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Customer reply replied 3 years ago
And if we don't have the flash?
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
If you have power on the pink wire but no flash, this would indicate a faulty ICM.
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Customer reply replied 3 years ago
Ok thanks. I'll get back to you later
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
Thanks I will look forward to your reply.
Dave
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Customer reply replied 3 years ago
Ok I have confirmed 12 volt power to both the white an pink wires. When I prob the the wires as requested in either direction there is no flash. This is a brand new module also...
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
Does your truck have a tach?
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Customer reply replied 3 years ago
Nope. Just tested module at slow reillys and confirmed good....this one I'd gonna drive me nuts
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
With coil and module unplugged, do you have 12 volts on white wire?
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Customer reply replied 3 years ago
Does ground placement matter? The engine ground is on frame. Isn't it supposed to be a body ground??
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
Main ground cable should attach from battery to engine block. You should also have a ground strap from the engine to the body at firewall, a second ground strap from engine to frame.
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Customer reply replied 3 years ago
Module unplugged? You mean the 4 wire plug?
Customer reply replied 3 years ago
Ok with 2 wire unplugged from coil I have 12vlots on tach wire and power wire plug if that's what your asking. Replaced the 2 wire plug from coil to module and confirmed all grounds. with key on if I unplug the 2 wire plug from distributor from coil and hook it up it will trip injectors
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
If you unplug 4 wire connector and crank the engine, do you get spark?
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Customer reply replied 3 years ago
Nope. Tried it
Chevy Mechanic: Dave Nova, Chevrolet Technician replied 3 years ago
I am about out of options on this one. Likely something wrong with the wiring where the white wire is shorted to voltage, but the schematics for these older vehicles are hard to come by. I am going to opt out and allow other experts to chime in on this one. Perhaps one has some direct experience with this issue. Best of luck on your repairs.
Dave
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