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97205LT1
07-17-2013, 11:25 AM
Have a 1997 Prostar with LT1 at cold start engine idle hunts - fluctuates revs up and down. Reading some posts sounds like it might be IAC? Is it worth trying to clean and if so best method. If replacement is recommended does anyone have a part number? Thanks

toolz
07-17-2013, 11:13 PM
I've had a TPS do the same thing. It was caused by moisture getting in it (on a boat? imagine that). New ones are pretty cheap, but you can put it in an oven at around 300 degrees for a while to dry it out, and give it a try.

97205LT1
07-18-2013, 06:51 PM
Thanks for info

JimN
07-18-2013, 08:24 PM
Have a 1997 Prostar with LT1 at cold start engine idle hunts - fluctuates revs up and down. Reading some posts sounds like it might be IAC? Is it worth trying to clean and if so best method. If replacement is recommended does anyone have a part number? Thanks

Scan for codes. If you want to see if the TPS is the problem, unplug the harness from it. If won't necessarily idle perfectly, but it will be stable. You can also unplug the IAC to see if it eliminates the hunting.

97205LT1
07-19-2013, 07:55 AM
Don't have a scan tool will try the unplug method on both to isolate which one is causing issue. Only hunts on cold engine start up for 5-15 seconds then good for rest of day. Thanks

JimN
07-19-2013, 08:12 AM
Don't have a scan tool will try the unplug method on both to isolate which one is causing issue. Only hunts on cold engine start up for 5-15 seconds then good for rest of day. Thanks

Do a search here or google for code scanning and look for references to using a paper clip.

97205LT1
07-19-2013, 09:37 PM
Will do thanks.

97205LT1
07-20-2013, 02:15 PM
Checked on code scanning appears 95 and newer paper clip does not work. Has anyone done a 97 lt1 with a paper clip for code scanning? Thanks

JimN
07-20-2013, 06:10 PM
Checked on code scanning appears 95 and newer paper clip does not work. Has anyone done a 97 lt1 with a paper clip for code scanning? Thanks

The paper clip DOES work on your boat but your check engine light may not be working properly. According to a PM from EngineNut (a member here, who works for Indmar), "That abiity went away with the advent of CAN communication which started in 2005 model year.".