P30 Chassis Mis-fires 1988 Holiday

[arthur.jeck]

Have had problem with mis-fires when heated and still no cause found (3+ years).

is it possible the a poor charging system could cause weak spark???

Have changed plug wires, etc .

Ignition module coil.

Thanks

Any help world be great.

Art

[kaypsmith]

I owned an 87 model Southwind (P30) chassis several years ago that had similar problem. The only remedy that I found was to go to a racing store, and replace the plug and coil wires with a high performance set of wires, cost over a hundred dollars. Yes a poor charging system could cause a problem, a slight leak in the intake manifold can have an ill effect, also a cracked plug. or a crack in the distributer can also. Hope you find the culprit soon, Kay

[dickandlois]

Art, Have you tested the vacuum advance hoses and that the vacuum advance module works with vacuum applied?

The mechanical advance under the rotor, replaced the rotor and cap?

Kay mentioned the wires.

I owned a P-30 chassis and put 130,000 miles on it. Replaced the wires and the insulating material under the metal plug sleeves once.


Rich.

[luvtheus]

Arthur what engine is in your coach, Ford 460 or a Chevy 454?

Yes a poor charging alternator could cause an ignition problem but you would also have problems with your headlights being dim, etc. Your alternator should be putting out around 13.4 volts to the battery when the engine is running. If it is not then you need the charging system checked out by someone who knows what they are doing.

If the system is good then your problem is either in the ignition system or the fuel system.

What all have you done or replaced?

[bm02tj]

With factory type plug wires when they run parallel you can get induction and fire a plug to a cylinder with the intake valve open.

Back when propane conversions where common a few air boxes blew off from cross fire from induction, so try to separate your wires and if crossing another one try for 90 degrees to prevent induction.