Print Page - Idling problem when cold ( '91 5.0)

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 01, 2009, 01:23:26 PM

I swapped a '91 cougar 5.0 into my CJ. It runs like a champ when it's warmed up.

The problem is it doesn't want to idle when it's first started. The idle seems to go up and down, then it will idle really low and die.

Any tips would be great.:D

Title: Idling problem when cold ( '91 5.0)
Post by: jcassity on March 01, 2009, 02:02:00 PM

Like it hunting?

I assume something is not connected which will prevent a decent list of codes to be listed. If everything is connected, pull codes.

I would first turn the key on and check the TPS green wire for less than one volt.
if it has more, remove TPS , file the holes oblong so that it can be installed and rotated either way to obtain the voltage.

next, I would fiddle with the idle a little bit.

The tps adjustment will improve this problem and you shouldnt have to bother the idle.

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 01, 2009, 02:07:38 PM

Thanks so much for the quick reply and info. I will check the tps for proper voltage.

It's my rock crawler/fun to cruise around in toy.:D

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 01, 2009, 02:10:49 PM

(http://im1.shutterfly.com/media/47b8d809b3127ccec42db8a0017e00000050O00IbM2zZo5bsQe3nww/cC/f%3D0/ps%3D50/r%3D0/rx%3D550/ry%3D400/)

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 01, 2009, 02:13:08 PM

(http://im1.shutterfly.com/media/47b7cc37b3127ccec2b57fccf96500000010O00IbM2zZo5bsQe3nww/cC/f%3D0/ps%3D50/r%3D0/rx%3D550/ry%3D400/)

A little something different for you guys to look at.;)

Title: Idling problem when cold ( '91 5.0)
Post by: massCougarxr7 on March 01, 2009, 02:52:27 PM

Different is right........cool yes, wow, its the only one ive seen with a 5.o, but then again im not much of a jeep fan....sorry :hick:

Title: Idling problem when cold ( '91 5.0)
Post by: Kitz Kat on March 01, 2009, 03:32:12 PM

I see your from Ca. and you have the egr, Is this still road runnable?
I got more ?'s than answers at this point. Nice ride .

Title: Idling problem when cold ( '91 5.0)
Post by: V8Demon on March 01, 2009, 05:31:10 PM

Why do the intake and throttle body look as if they are from an S.O 5.0?

Anyway -- What fuel pump/lines are you running?

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 02, 2009, 10:18:21 PM

I haven't got it reffed yet, but it will be streetable.

I'm not sure what the S.O 5.0 is?

The motor came out of a '91 Cougar.

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 02, 2009, 10:23:01 PM

The fuel pump is an electric I picked up at a napa store, using the ractory hard lines, with FI hoses to connect with.

Title: Idling problem when cold ( '91 5.0)
Post by: atariman on March 02, 2009, 10:37:48 PM

Thats a pretty cool cj7 you got there. The first I have seen with a ford engine in it. Everyone usually does the 350. Nice to see something different. Cool jeep.
Brian

Title: Idling problem when cold ( '91 5.0)
Post by: Haystack on March 03, 2009, 08:59:33 PM

that is a stock 86-88 cougar engine. look at all the brackets and what not. He has a stock 150hp engine, not the 200+ from a mn-12 cougar or mustang.

Title: Idling problem when cold ( '91 5.0)
Post by: rok_toy on March 03, 2009, 09:30:11 PM

Quote from: Haystack;259404

that is a stock 86-88 cougar engine. look at all the brackets and what not. He has a stock 150hp engine, not the 200+ from a mn-12 cougar or mustang.

Like I stated earlier, the engine was pulled out of a 1991 Cougar with an auto tranny. And I can tell you from driving it...it has more than 150hp.

My straight 6 had about 140hp, and this thing is way more powerful.

Oh, and thanks Brian.:D

Title: Idling problem when cold ( '91 5.0)
Post by: 20thanniver-ls on March 03, 2009, 09:47:32 PM

Have you checked fuel pressure? If its an aftermareket or in-line fuel pump it could not be putting out enough presseure.

Title: Idling problem when cold ( '91 5.0)
Post by: Sick88Tbird on March 04, 2009, 10:34:38 AM

Looks like 14lb fuel injectors too... ??? Sure it's from a '91? everything in that picture is '86-'88 correct.

Title: Idling problem when cold ( '91 5.0)
Post by: V8Demon on March 04, 2009, 11:24:08 AM

Quote from: Sick88Tbird;259470

Looks like 14lb fuel injectors too... ??? Sure it's from a '91? everything in that picture is '86-'88 correct.

'cept the aluminum valve covers ;)

Looking at some pics I have of MY engine, that one you posted APPEARS to have the old school 302/SO firing order as well.....

Differences between SO and HO: http://www.coolcats.net/tech/advanced/ho_conversion.html

If that engine came out of a '91 cat; than that aint the original engine from that car....Unless the block was in the car and someone pieced it together without knowing too much about the differences...

Quote

The fuel pump is an electric I picked up at a napa store

What type of vehicle is the pump specified for?

Title: Idling problem when cold ( '91 5.0)
Post by: 20thanniver-ls on March 04, 2009, 09:52:47 PM

[QUOTEthat one you posted APPEARS to have the old school 302/SO firing order ][/QUOTE]

Looks exactly like my '87. Didnt the HO motors from the mn-12's have an elbow on the upper? If i remember correctly my 93 Cougar HO had it.

Title: Idling problem when cold ( '91 5.0)
Post by: V8Demon on March 05, 2009, 06:29:08 AM

Yes, as well as the 94-95 Mustang H.O.'s.

Title: Idling problem when cold ( '91 5.0)
Post by: Kitz Kat on March 05, 2009, 04:30:57 PM

What did you use for a computer in it? I should say what comp?

Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: rok_toy on March 01, 2009, 01:23:26 PM