2.5 Merc TPS NLA?

**4JawChuck** · 06-30-2018, 01:22 PM

Have 2.5L 1991/1992 200HP Merc with a TPS sensor thats got a bad spot in its range, engine is low hours fresh water engine and runs great, excellent compression, oil injection removed and timing retard modules removed which was done by myself to improve reliability.

Since I want to maintain this engine in good shape I was checking all the electronic components and setting the timing correctly at 23 degrees I found a bad spot in the TPS right at part throttle...obviously its worn out.

The replacement is no longer being made and the Merc dealer has an alternative part number which adapts to the older engines for $400 CDN where the old style TPS was $90CDN!!!

I managed to find old stock in the US at various dealers but either they are unwilling to ship or simply don't return my calls, not too many left out there and their stock level on the dealer network may not be accurate so I could be SOL anyway.

Now I don't mind making the investment in a $400 TPS if it truly was superior component that might last longer than the original but there is nearly no info on these simple devices that only vary resistance with throttle movement.

I am very handy when it comes to electronics and fabricating so for $400 I could make a pretty fancy TPS sensor using industrial POTs that would never wear out, heck at dollar value I could do optical sensing with a small control board.

My question is are there alternative old school TPS sensors available from the aftermarket or is it possible to disassemble the old sensor and restore/clean it (essentially have you done it with success). If the new style sensor is a different design and much longer lasting and worth the upgrade I could swallow the cost but if its the same design and just a money grab I'll come up with my own solution.

Pics attached of the boat/motor combination.

**Dave Strong** · 06-30-2018, 01:46 PM

You can't service them. Have to buy new or get a Brucatto ACU. They don't use the TPS.

Dave

**FUJIMO** · 06-30-2018, 02:40 PM

whats the mercury part number, for the mercury tps you need?

**Schramer** · 06-30-2018, 10:03 PM

Ace is selling one in Misc as we type......not positive if it will work with your set up but I would look into it bud

**Capt.Insane-o** · 06-30-2018, 10:44 PM

The money spent on a brucato ecu is well spent.

**4JawChuck** · 06-30-2018, 11:17 PM

Originally Posted by FUJIMO

whats the mercury part number, for the mercury tps you need?

Item #9 in this link: Part #14857, 14851003, 14857T03

http://www.marineengine.com/parts/me...0413MD/573_150

Sorry got the price of the new TPS wrong...its $650 USD!!!

**Dave Strong** · 06-30-2018, 11:17 PM

My TPS ever screws up, I will have a Brucato.

Dave

**Dave Strong** · 07-01-2018, 11:13 AM

There is one for sale in miss parts on here for $110 best jump on it.

Dave

**BUZZIN' DOZEN** · 07-01-2018, 11:23 AM

https://www.ebay.com/itm/New-Mercury...wAAOSwImRYOAya

**Ajskennels** · 07-01-2018, 11:56 AM

its the same part thats on any 2.5 liter laser injected motor, you shouldn't have any problem at all finding a good used 1

**4JawChuck** · 07-01-2018, 06:44 PM

Sure looks like a Brucato SVS is a better spend of the money, I've never looked into them before this.

I assume there is a performance advantage as well, need to justify another mod to the wife...haha.

**Dave S** · 07-01-2018, 08:21 PM

I have it if you still need it.

**Capt.Insane-o** · 07-01-2018, 08:26 PM

Ugh, I totally misread the application I apologize for that. And holy sh*t that price. I can't imagine the 3 liter sensor is any different other than the connector?

**Dave Strong** · 07-01-2018, 08:30 PM

Originally Posted by Capt.Insane-o

Ugh, I totally misread the application I apologize for that. And holy sh*t that price. I can't imagine the 3 liter sensor is any different other than the connector?

Pretty nuts, if my Pro Max GPS fails I will just do the Brucatto thing.

Dave