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Forum: General Q & A

11-11-2013, 10:59 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Quick update. It was the ICM. Changed it out...

Quick update. It was the ICM. Changed it out and all is well in 502 land!

Just got back from stealing one last boating trip from winter! Made a run from Parker to Needles at a fairly good clip,...

Forum: General Q & A

09-25-2013, 04:51 PM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Weird is an understatement... When the problem...

Weird is an understatement... When the problem occurs, I can snatch the throttle from where it has the hiccup to WFO and it will run WO all day. I thought it could be a tps, so I may end up...

Forum: General Q & A

09-24-2013, 11:58 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Still happening. Taking longer to manifest...

Still happening. Taking longer to manifest itself with the weather getting colder.

I am to the point of throwing parts at it. I have a new ignition control module coming, so we will see if...

Forum: General Q & A

07-08-2013, 04:08 PM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

I already checked the anti siphon valves, they...

I already checked the anti siphon valves, they move freely. I can pound out the stainless ball but why? If they haven't give me any problems I would like to keep them as they do serve a purpose.
...

Forum: General Q & A

07-05-2013, 11:29 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

I stopped the vapor lock problem by wiring a...

I stopped the vapor lock problem by wiring a Holley Blue Marine fuel pump prior to the fuel/water separator to force feed the high pressure pump at the cool fuel.

BUT, I still have the stumble...

Forum: General Q & A

07-03-2013, 02:27 PM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Excellent, I will find out what the filler tube...

Excellent, I will find out what the filler tube size is and pick one of those up.

Forum: General Q & A

07-03-2013, 10:46 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

There is an access port in the center of the boat...

There is an access port in the center of the boat (between the passenger and drive seats) that allows access to the fill location and vent. I will see about tapping into one of those lines.

Does...

Forum: General Q & A

07-01-2013, 05:21 PM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

I am certain that I have figured out my problem. ...

I am certain that I have figured out my problem. Vapor locking SOB!

After a hard run and shutdown the Starboard engine will start then die. No fuel pressure at the rail. I can release the...

Forum: General Q & A

06-26-2013, 11:56 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Did this problem happen right away? Or did it...

Did this problem happen right away? Or did it take a period of time for it to manifest itself?

Forum: General Q & A

06-26-2013, 11:53 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Ok, one thought. The previous moron replaced the...

Ok, one thought. The previous moron replaced the fuel pump and they broke the black shroud that covers the cool fuel. Could heat soak be affecting it?

Forum: General Q & A

06-26-2013, 11:49 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Located in West Jordan, Utah. Suburb of SLC. ...

Located in West Jordan, Utah. Suburb of SLC.

Has cool fuel, just replaced regulator, and the screen under the regulator. All fuel pressure was taken at the rail. 30-33 PSI at idle, 38-43 WFO...

Forum: General Q & A

06-25-2013, 04:15 PM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

Anyone? Buhler?

Anyone? Buhler?

Forum: General Q & A

06-21-2013, 09:48 AM

Replies: 21

1999 502 Mag Stumble and Back Fire After Long Run Time

Views: 2,980

Posted By justinp20012500

1999 502 Mag Stumble and Back Fire After Long Run Time

I need some help with my problem child...

I have a 502 Mag that will stumble and backfire ONLY when ran for long periods above 2300 RPMS. It usually takes 30-45 mins of run time (At any RPMS) to...

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