TPS Fault. Part question.

J

JBFins22

New Member
May 14, 2013
48
Seekonk, MA
Boat Info
280 Sundancer 2004
Engines
4.3 MPI Mercruisers w/Alpha Drives
Had an alarm after a 2 hour trip. Fault TPS. This only happened after coming down to an idle, during docking on both legs or trip. I figured I would buy a new one and swap it out. Easy enough. I'm looking around and I'm seeing some on ebay for cars for $12. The quicksilver ones are about $100. In the item description it actually says "interchange" or "other part number" and lists the quicksilver number (853678T). Since this part has nothing to do with raw water flowing through it or near it, is this something anyone else would try? Both parts look absolutley identical. Thanks in advance!
 
I can't imagine why they would be any different from a chevy to a Mercruiser.

I found this an interesting read on a Chaparral site:

Warning: No proper spacing of words or paragraphs :)

Posted 30 April 2011 - 09:37 AM

Since last summer I was having idling problems on my stbd 350 mag MPI. So when our 330 Sig got wet last Tues I decided to fix the problem once and for all. I switched the throttle position sensor (TPI)from port engine to stbd engine and had no improvement in idling. The port engine was still stalling and "hunting". Then I changed the IAC valve from port engine to stbd. My stalling problem went to the port engine. Bad IAC valve. This is where it gets interesting. My first stop was Autozone with part in hand. They couldn't cross reference it but the guy at the counter said "That sure looks like a Ford IAC". huh?" I'm running a chevy sir." Next stop was a mercruiser dealer. They didn't have the part of course but did verify that mercruiser did indeed use a Ford IAC on there 350 mag mpi engines. He said this was because they had only 2 wires left on the ECM for the IAC and chevy IACs are 4 wire. Fords are 2 wire. Now I went to Advanced Auto. Found a guy who was fast on the computer search engine and started looking at every Ford IAC they had. Soon I found an exact match! My mercruiser 350 mag mpi uses an IAC made by Ford for their 2002 Ford Windstar! I purchased it and installed it last night. My 350 mag idles and runs perfectly. Also I might add that the price was less than half of the merc part.
 
Dieseljeff said:
I can't imagine why they would be any different from a chevy to a Mercruiser.

I found this an interesting read on a Chaparral site:

Warning: No proper spacing of words or paragraphs :)

Posted 30 April 2011 - 09:37 AM

Since last summer I was having idling problems on my stbd 350 mag MPI. So when our 330 Sig got wet last Tues I decided to fix the problem once and for all. I switched the throttle position sensor (TPI)from port engine to stbd engine and had no improvement in idling. The port engine was still stalling and "hunting". Then I changed the IAC valve from port engine to stbd. My stalling problem went to the port engine. Bad IAC valve. This is where it gets interesting. My first stop was Autozone with part in hand. They couldn't cross reference it but the guy at the counter said "That sure looks like a Ford IAC". huh?" I'm running a chevy sir." Next stop was a mercruiser dealer. They didn't have the part of course but did verify that mercruiser did indeed use a Ford IAC on there 350 mag mpi engines. He said this was because they had only 2 wires left on the ECM for the IAC and chevy IACs are 4 wire. Fords are 2 wire. Now I went to Advanced Auto. Found a guy who was fast on the computer search engine and started looking at every Ford IAC they had. Soon I found an exact match! My mercruiser 350 mag mpi uses an IAC made by Ford for their 2002 Ford Windstar! I purchased it and installed it last night. My 350 mag idles and runs perfectly. Also I might add that the price was less than half of the merc part.
Click to expand...


That pretty much sums it up for me. I just took it off and I cant see any difference at all. I'm going for the cheap on one ebay. If it doesn't work then I wasted $6 for shipping. Thanks for sharing that and for your help! Here's an eBay link for anyone else that might try this: http://www.ebay.com/itm/NEW-Throttl...Parts_Accessories&hash=item338fcd4d31&vxp=mtr
 
On a different note:

Before my Sea Ray I had a Larson 270 with the Volvo Penta injected 7.4 and Duo Prop.

My steering pump went out and I wasn't about to pay the $250-$300 that VP wanted so I took it to a local auto parts store
and it was match to, I believe, a 1977 AMC concord. All I had to do was swap the high pressure hose fitting from the old to the new one
and pay the $55.00 for the part. Otherwise it was an exact match.

Jeff
 
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