Q: 86 GMC 305 quits firing occasionally

asked by on

I have an '86 GMC 305. It quits firing from time to time. I replaced the coil, control module, rotor and pick-up coil. Do you have any thoughts what could cause this?

This car is very old. Personally, I’d just go and get a rebuilt distributor. Most companies sell the rebuilt distributors with the lifetime warranty. They don’t cost that much. Replace your entire distributor assembly.

If that doesn’t fix it, then you’re going to have to trace the wiring all through and see where the wiring short is. You changed that control module and the coil, but I would change the entire distributor assembly. There’s so many tiny wires there that can short out and they are so cheap. Just change the entire distributor assembly with a rebuilt unit to have this issue taken care of.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. 86 GMC 305 quits firing occasionally

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My transmission won't go in reverse. Our mechanic said the ECM is bad. Would that cause that?

Hello. No, the ECM by itself should not cause a transmission failure. I suspect the low/reverse band has gone out on your transmission. The newer electronic transmissions have the ability to adjust to wear in the various clutches and bands...

Q: Reduced engine power message is on the dash.

The reduced power light is on for either the catalytic converter is overheating or the transmission is malfunctioning. If the vehicle is able to shift through all of the gears, then check the engine to see if there is a...

Q: Car will start and not start

I have seen may of these engines distributors get oil inside of them from leaking seals and this will cause failure of the crankshaft and camshaft sensors inside of the distributor. The distributor should be inspected to check if there...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...