5.8 HO PCM Engine ????????

(kcross) · (kcross) **Join Date: May 2005** 05-24-2005, 5:04 AM

94 Carburated Engine. New carburator,fuelpump,spark plugs & wires,alternator. Engine will from time to time
cut off while running. It sounds like it is back-
firing thru the caburator. Other times it runs
great. I am at my wit's end.

(sbt3) · (sbt3) **Join Date: Jun 2002** 05-24-2005, 5:44 AM

Trying to help over the net is a little tough but I can give you a few other things to try. I had problems with mine not wanting to start correctly when it was hot, once it started it ran ok. It turned out to be the coil. The coil is a pretty cheap and may be worth a try. Also have you checked the timing? This probably wouldn't cause what you are describing but it is worth checking. I would start with the coil. Does it have electronic ignition or points. My guess would be electronic but if not check the points.

(mikeski) · (mikeski) **Join Date: Aug 2003** 05-24-2005, 1:19 PM

New carb... my guess is that the float is set too low and it is running out of fuel in the bowl, adjust the float.

Backfiring through the carb = lean condition

powerstroke 05-24-2005, 1:26 PM

1st thoughts are coil.. cracked where the wire goes on sometimes emitting spark from there. not sending the spark to your plugs(ask me how i know). and then i would check your point gap if you have em... your timing may also be off. especially if you are running at high altitude and the boat came from low altitude or vice versa. then i would check your low speed adjustments on your carb. is it cutting out when you are going from idle to pulling someone up, at full speed or what?

leonfokker 06-02-2005, 8:28 AM

hello can somebody please help me to find a owners manual and workshop book for my motor pcm 5.8 ho 295 hp I have some problems It sounds like a harley looks like one cyclinder is not fireing
thanks leon

supraboarder 06-02-2005, 10:38 AM

Ryan, I've seen Kim's boat die while he was in the middle of pulling a wakeboarder. I know it's happened to him a few times, but that was the only time I had seen it, so the conditions may have been different each time.

Damn Kim, I didn't know that you had replaced all that and it's still happening! I bet Kyle's just itching to make this the perfect opportunity to get a new boat :-)

(phatboypimp) · (phatboypimp) **Join Date: Apr 2005** 06-02-2005, 11:58 AM

These are great suggestions. My first thought would be coil and points, 1994 I imagine that is standard ingnition. If it truly is backfiring through the carb you know it is an ignition problem. If you are unable to properly time it (I can provide more detail) your timing chain/belt might have jumped or you have worn lobes on your distributor. With a 1994, the chain/belt could be worn. Since it is intermittent in nature, I doubt it is a chain/belt issue.(obviously thinking as I type)

I would replace coil, points and reset the timing, run it and see if the timing advances if it does you have a chain/belt/lobe issue.

(salty87) · (salty87) **Join Date: Jul 2002** 06-03-2005, 10:51 AM

holley carb? you might want to check the power valve, they don't like backfires.

coil, points, and timing....sounds like a really good start to isolating the problem.

(ridehartwell) · (ridehartwell) **Join Date: Jun 2004** 06-03-2005, 8:24 PM

Shawn - Since he lives right next door to you and Gordy knows how to get into Mini-me's mentors home, he's gonna get your keys to the Launch and be done with it.

On a serious note, thanks for all the post help. Coil is first on the list.

Tim for Kim

powerstroke 06-04-2005, 4:14 AM

another thought comes to mind for the cutting out.....faulty ignition switch.