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Forum: General Q & A

06-26-2021, 10:14 PM

Replies: 2

496 mag exhaust manifold over temp

Views: 920

Posted By Macman

It was fine last time I changed it. I think I am...

It was fine last time I changed it. I think I am going to go ahead and pull the pump and check it. It is just a total pain in the arse on this boat. No room and fuel pumps in the way.

Forum: General Q & A

06-26-2021, 09:31 PM

Replies: 2

496 mag exhaust manifold over temp

Views: 920

Posted By Macman

496 mag exhaust manifold over temp

My 496 sets an alarm for exhaust manifold over temp when idling for several minutes after I put the boat in the water. I can rev it a few times and the alarm goes away and it is fine for the rest of...

Forum: General Q & A

08-21-2020, 08:29 PM

Replies: 8

496 mag IAC valve came apart

Views: 2,720

Posted By Macman

I figured this out last night that there was no...

I figured this out last night that there was no spring in the OEM. This sent me on a wild goose chase because I thought my engine ate it. I crossed the Mercury part number to the Napa number. I'm at...

Forum: General Q & A

08-20-2020, 12:36 AM

Replies: 8

496 mag IAC valve came apart

Views: 2,720

Posted By Macman

496 mag IAC valve came apart

Last weekend I had an alarm go off on my 2007 Baja with a 496 mag and it would die at idle. I removed the IAC valve and found that it had mechanically failed. The brass shaft and spring were gone. I...

Forum: General Q & A

07-16-2016, 09:21 PM

Replies: 4

496Mag pinging/detonating

Views: 698

Posted By Macman

I will pull it apart and look for peeling paint...

I will pull it apart and look for peeling paint inside the housing as well.

Forum: General Q & A

07-16-2016, 08:42 PM

Replies: 4

496Mag pinging/detonating

Views: 698

Posted By Macman

I may have just found something. That previous...

I may have just found something. That previous reading was key on engine off due to the fact that didn't have a water source. Now testing it while running the pressure is about 37psi at idle and...

Forum: General Q & A

07-16-2016, 07:37 PM

Replies: 4

496Mag pinging/detonating

Views: 698

Posted By Macman

496Mag pinging/detonating

I have a 2007 Baja with the 496 mag. Last week on vacation it suddenly developed a bad misfire/detonating issue. The engine fires right up but sounds like it has a slight hiccup at idle. Once you...

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