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Old 04-29-2014, 09:23 AM
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1994+ T-stats - inline fuel pums TBI/MPI - warm hard start

I had a great conversation with Vince from SKIDIM regarding the 142/143 and 160 T-stats.

There have been a number of threads discussing hard warm restarts after installing a 160 t-stat. I also had the same problem.

What I did find out is the when run is that the inline pump fuel system would suffer from vapor lock when an engine would heat soak to 175-180. And yes it's a vapor lock - the inline pumps can't push vapor. There was no way to send mach vapor back to tank on the inline TBI pumps even thought the bottom of pump had nipples on bottom of pump. Top of pump only has one nipple.

PCM came up with a patented solution prior to USCG allowed boat manufacturers to put fuel pumps in the gas tank. PCM made an extrernal fuel filter with a high pressure pump inside it.

MC was the first to gain approval to get the in tank fuel pumps which had a vapor return to tank which solved the problem. (In tank fuel problem - another thread)

The ECT was / is not the problem - hence why the motors started cold and ran well with 160 degree t-stats. I asked if a bad ECT could cause this - Vince said so since PCM engines also the same symptoms and developed another solution prior to in tank pumps.

I run on the Illinois and never want to be in the way in any of the barges that travel the river..

It's too bad because the motors do run better with the 160 t-stat.

SKIDIM will no longer be recommending the 160 t-stat for motors for TBI with inline pumps for Indmar.

My MCOCD would not let me put this away - so I called and asked Vince.. I hope this this helps.
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Old 04-29-2014, 04:30 PM
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Very interresting,Thanks!
So i should use a 143 on my 94 TBI?
Any crossover from NAPA?
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Old 04-29-2014, 05:56 PM
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I have what some refer to as ADDMCOCD in that I can't remember what t-stat I currently run. I know at one time I had the 160, but I think I switched to the 143.........I think!! Is there a way to tell???
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Old 04-29-2014, 05:59 PM
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Quote:
Originally Posted by André View Post
Very interresting,Thanks!
So i should use a 143 on my 94 TBI?
Any crossover from NAPA?
Not sure the cross reference - but it needs to be drilled for bypass flow.
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Old 04-29-2014, 06:02 PM
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Quote:
Originally Posted by supturb89 View Post
I have what some refer to as ADDMCOCD in that I can't remember what t-stat I currently run. I know at one time I had the 160, but I think I switched to the 143.........I think!! Is there a way to tell???
ADDMCOCD - lol that's stage 2 MCOCD lol... the temp should stamped into.

I recommend buying the stat from SKIDIM - or someone needs to tell me where to drill the hole in the t-stat.
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Old 04-29-2014, 06:19 PM
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What temp t-stat went in originally? Was there a change later in 94 production; reason I ask is my boat hardly EVER runs over 140, mostly in the 130 range. Went out the other day and it didn't make over 125, of course the water is 65. Just curious
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Old 04-29-2014, 06:26 PM
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Quote:
Originally Posted by bret View Post
What temp t-stat went in originally? Was there a change later in 94 production; reason I ask is my boat hardly EVER runs over 140, mostly in the 130 range. Went out the other day and it didn't make over 125, of course the water is 65. Just curious

Manual says 142 for TBI. 142 and 160 on LT-1
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Old 04-29-2014, 06:37 PM
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I spoke to Indmar about what the original T-stat was in my '97 TBI. As stated above 142 is what it came with and what they recommend.
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Old 04-29-2014, 07:04 PM
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Quote:
Originally Posted by mikeg205 View Post
ADDMCOCD - lol that's stage 2 MCOCD lol... the temp should stamped into.

I recommend buying the stat from SKIDIM - or someone needs to tell me where to drill the hole in the t-stat.
The 1/16" hole would be drilled at the 12 o clock position.
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Old 04-29-2014, 07:06 PM
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
The 1/16" hole would be drilled at the 12 o clock position.
got a picture?
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