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9

98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Sounds good. I plan to drain the oil when I get back to it and check for water. Then I'll start engine disassembly. Might be a week...

Wednesday at 6:29 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Well folks, I think we've identified a major problem here. Did a compression test today and the results are as follows. Cylinder numbers...

Wednesday at 5:49 PM
9

98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

They were put in last year by a shop. I'd say maybe 10 hours idle, 10 hours cruise, couple hours WOT, knowing that WOT is only hitting...

Tuesday at 5:26 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Spark plugs. Delco #MR43LTS Aligned in the photo how they came out of the engine. Closest plugs near the belt. A few electrodes...
Tuesday at 3:10 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Starboard side, same deal. Did notice where there must have been a small water leak...unsure if this is an issue or just needed more...
Tuesday at 3:08 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

First, Port side elbow, riser, and exhaust flappers. I noticed nothing out of the ordinary, except maybe some carbon deposits.
Tuesday at 3:04 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Alright, went through a few things today. Here's my findings. Pulled elbows and inspected risers and exhaust flappers. Risers look good...

Tuesday at 2:53 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Well, thanks everyone for the warnings about my large tub of water idea. Looks like I'll have to ask a friend to borrow their driveway...

Tuesday at 9:22 AM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

I apologize for the abrupt ending there...had some connection issues with the website. The post was supposed to continue as follows...

Monday at 9:08 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Actually, the engine and drive oil were changed twice within a month...once at the shop who 'checked' the distributor and again at the...

Monday at 8:58 PM
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98BaronMag replied to the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power.

Absolutely, I'm ready and prepared to do some serious troubleshooting. I know the engine and drive oils have been changed as I had a...

Monday at 7:37 PM
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98BaronMag posted the thread 1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power in Mercury MerCruiser Sterndrives & Engines.

Hello all, I've been pouring over dozens of old threads the last few weeks trying to sort out some issues I'm having, but was mostly...

Monday at 6:21 PM