new ford taurus fan issue

[overkill-lt1]

ok guys  last year i put a new motor in my ford taurus fan and then sent it to the paint shop. so this pasty week i had it out and when the fan comes on, my car starts  hunting for and idle and will eventually stall out. could this new motor be backfeeding somehow or should i loom elsewhere. i unhook the fan car gets to temp and it idles  jsut fine and steady. plug the fan, start it up and like clockwork it starts to hunt.  thanks

[scuter83]

Is your intake right behind your fan?  Any chance you are messing up the airflow into your MAF?

[digitalsolo]

Low amp output from alternator?

[cool]

Check your battery too.

[overkill-lt1]

Is your intake right behind your fan?  Any chance you are messing up the airflow into your MAF?

i have it wrapped. i will log and see if it spiking or not
thanks

[overkill-lt1]

Low amp output from alternator?

i will check both of these out

[Ey8s]

I'm currently running a two speed tbird 4.6 fan, before that it was a single speed mark vii fan.
they take A TON of amps to get going.  my single speed mk vii had an 80 amp surge when it came on.
I can see where that type of draw could mess with your ecm, especially if you don't have a high amp alternator (120 or better) and/or have your fan wired as a single speed/high setup.

this is the relay setup I'm running now (just food for thought):
http://www.hollisterroad.com/proddetail.asp?prod=MarkVIII

[clocker]

I've run all my fans (Taurus, Volvo and currently, 18" Lincoln) through a Volvo fan relay and a 30A fuse.
Never blown the fuse, fans work great in both speeds.

I keep hearing about the massive starting current draw of these fans and wonder why it's not tripping my (theoretically) undersized fuse.

[largeorangefont]

The starting amps get higher as the fan motor wears out.

[clocker]

The op said he installed a new motor recently.

[largeorangefont]

Yes that's true. I have no experience directly but I have read that some aftermarket replacement fan motors are "sub par" and suck a lot of amps on start up as well.

80 amps is a lot to get a fan going.. Too much in my opinion and requires some investigation.

Here is some info on typical AMP draw from Taurus and Mark VIII fans.
http://www.thehollisterroadcompany.com/TaurusMarkVIIIrelay.html

I have 2 SPAL 11 inch fans, each on a 30 amp fuse with no problems.

[Ey8s]

the mark viii fan was pulled from a JY so there is probably merit to the idea of increased resistance with age/use.

[Supe]

My Firebird had a new Mark VIII fan, and with no fan controller, it would pull between 80-86 amps on startup, and about half of that continuous.