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-   -   500EFI Whipple idle problems (https://www.offshoreonly.com/forums/general-q/255480-500efi-whipple-idle-problems.html)

skydog 06-16-2011 04:57 PM

Hahahah yea my wife told me that many times hahahah

spyderconv1999 06-18-2011 06:43 AM

Ok hooked the scanner up lastnite and showed a map sensor low code, also checked the iac position and it was at 0, tried to adjust it to 40 and the motor just revs to the moon and iac position goes to like 120+. The weird thing is with it revving high like 1300 with the throttle closed the tps said 1.75 volts till I shut the motor down

skydog 06-18-2011 07:13 AM

Sounds like vacuum leak, low map. Make sure map is not pluged with crap. Or intake not pluged and look at all plugs in to sensors make sure one of the little male prongs are not getting bend to the side and not going in female part of the plug.

skydog 06-18-2011 07:20 AM

Look real close at wires on tps too. U are close to it buddy.

skydog 06-18-2011 07:25 AM

One other thing.... U said after u rev it up it stays high right. If u get the idle down manually is the idle smooth and right or does it want to stall until u turn key off and restart?

skydog 06-18-2011 07:34 AM

That tps volts is not right buddy. U need to check to see if the tps is going all the way back or its in the tps. What does motor do if u Unhook tps from intake I mean unscrew the tps.(keep it pluged in) start motor and rev up does it idle back down right if u don't show the ecu any tps volts over idle?

spyderconv1999 06-18-2011 08:59 AM


Originally Posted by skydog (Post 3432132)
One other thing.... U said after u rev it up it stays high right. If u get the idle down manually is the idle smooth and right or does it want to stall until u turn key off and restart?

yes it just stays high, yes it wants to stall until i turn off and restart

skydog 06-18-2011 09:02 AM

Ok so I don't think its a vacuum problem if it was it would do it on start up and all the time.

spyderconv1999 06-18-2011 09:07 AM

when i shut the key off with it revving high and the tps v at 1.75 it goes back to .5-.6 volts at the tps, im thinking a vacuum leak and the computer trying to make up for it, ive check the volts and position of the tps a few times with the key on and the motor not running and its at .6v closed and very smooth to 4.75v

skydog 06-18-2011 09:10 AM

Well buddy u know anyone with a smoke machine? They are sweet u will find if u have a leak. Why better than just spray with carb cleaner.


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