Motorhome engine starting Issues

In summary, motorhome engine starting issues can arise from various factors, including battery problems, fuel delivery issues, ignition system faults, and starter motor failures. Common symptoms include slow cranking, clicking sounds, or complete failure to start. Regular maintenance, such as checking battery health, ensuring proper fuel levels, and inspecting electrical connections, can help prevent these problems. Troubleshooting may involve testing components like the battery, fuses, and starter system to identify the root cause.
  • #1
JimmyThe9
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My 1979 Dodge Fireball D450 5.9l Motorhome. It has recently stopped running after having a starter issue.
My 1979 Dodge Fireball D450 5.9l Motorhome. It has recently stopped running after having a starter issue. I replaced the starter, starter relay, starter solenoid, spark plugs, distributor and router, battery, and cables, and it still won't start. The fuel pump and filter are good. Also, I have replaced the pin that holds the gear shifter on the steering column in place could that have set off a sensor or burned a fuse in the ignition?
 
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  • #2
Welcome to PF.

What do you mean by "it won't start"? Does it crank and not fire? Does it crank and try to fire but won't run steady? Does it not crank at all (no starter solenoid "click")? What does the battery voltage read when you try to start the engine (before, during cranking, after)?
 
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  • #3
In a case like this the first thing to do is ask yourself what you could have reassembled wrong.
 
  • #4
Partition the problem.
It needs a spark, air, fuel and a sense of timing.

Starter motor.
Does the engine turn at normal speed, and in the right direction?

Fuel.
Does the fuel cut solenoid operate?
Is there an engine immobiliser?
Is the fuel tank and pump full of water?
How long was it sitting. Is the fuel old and stale?
Are plugs dry, or wet with unburned fuel?
If you spray an ether-based engine-starting-fluid into the air inlet, does it fire and run momentarily?

Spark.
Does the coil spark, and the spark get to the distributor?
Does the spark get from the distributor to the spark plug?

Air.
Is the air filter completely blocked or soaked in oil?

Mechanical.
Does the engine have compression?
Has the timing belt or chain failed?
 
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  • #5
Welcome, Jimmy!

I believe that truck does not have any safety switch killing the ignition based on the position of the gear shifter on the steering column, but just in case, you could easily test how alive one of the eight spark plugs is while cranking.

https://www.harborfreight.com/in-li...SW86CCqe_Urin2Vq0TM2mobs_paa2EQxoCtNAQAvD_BwE
63590_W3.jpg
 
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  • #6
Neutral safety switch will prevent the starter from cranking. No sense to allow cranking while disabling the ignition. Some unsuspecting person would run the battery down attempting to start if that were the case.
 
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FAQ: Motorhome engine starting Issues

What are common reasons for a motorhome engine not starting?

Common reasons for a motorhome engine not starting include a dead battery, faulty ignition switch, fuel system issues, starter motor problems, and electrical system malfunctions. It's important to systematically check each component to identify the root cause.

How can I tell if the battery is the problem?

You can determine if the battery is the issue by checking for dim lights, a clicking sound when turning the key, or if the engine cranks slowly. If you have a multimeter, measure the battery voltage; a healthy battery should read around 12.6 volts or higher.

What should I do if my motorhome engine clicks but doesn’t start?

If your motorhome engine clicks but doesn’t start, it may indicate a weak battery or a faulty starter motor. First, check the battery connections for corrosion and ensure they are tight. If the battery is fine, you may need to inspect or replace the starter motor.

How can I troubleshoot fuel system issues?

To troubleshoot fuel system issues, start by checking the fuel level in the tank. Then, inspect the fuel pump for proper operation, make sure the fuel filter is not clogged, and check for any leaks in the fuel lines. Listening for the fuel pump to activate when the ignition is turned on can also provide clues.

When should I seek professional help for starting issues?

You should seek professional help if you have checked the battery, starter, and fuel system but still cannot identify the issue. Additionally, if you notice smoke, burning smells, or if the engine makes unusual noises, it's best to consult a mechanic to avoid further damage.

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