OK running great at running temp but crappy cold

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Re: OK running great at running temp but crappy cold [Re: fasteddy] #992161 04/01/10 12:30 AM

Joined: Mar 2010

Posts: 136

shawnsdad

Wheeler

lol!!!!!!!!!! thanks

many thanks
loren

92 montero rs 3.0 locked rear

Re: OK running great at running temp but crappy cold [Re: shawnsdad] #992162 04/04/10 03:13 AM

Joined: Mar 2010

Posts: 136

shawnsdad

Wheeler

ok no codes!!! the volt meter just bounces so now where do I go?

many thanks
loren

92 montero rs 3.0 locked rear

Re: OK running great at running temp but crappy cold [Re: shawnsdad] #992163 04/04/10 04:27 PM

Joined: Dec 2007

Posts: 2,348

Orange Park, FL

Mudraider

Body Damage is Cool

As dumb as it sounds, my plugs have something to do with this. I change plugs and it starts and runs fine for around 500 miles. Then I have it running after 500 miles and it is cold and choppy in the morning. My 2 cents.

89 SWB, V-6 5SPD, OME Shocks, 16.5X37's, 2"BL, SR axle, Gen2 brakes, Lincoln w/Superwinch

Re: OK running great at running temp but crappy cold [Re: Mudraider] #992164 04/04/10 11:41 PM

Joined: Jan 2001

Posts: 13,649

Helen , GA

fasteddy

Web Wheeler

try reading the codes with a cheap 12v test light. Long blinks are the first number in the two digit code, short blinks are the second number. For example, long blink, long blink, short blink is 21. Some voltmeters (like a good digital or an undamped cheapie) bounce too much to get a good reading. The light works better.

Also check the accordion hose for any leaks. Air leaks there bypass the mass air sensor, and can lean out the mixture enough to make it run bad cold. Check the hose to the valve cover off the accordion hose, too, for leakies.

Not responsible for advice not taken...

Re: OK running great at running temp but crappy cold [Re: fasteddy] #992165 04/05/10 12:36 AM

Joined: Nov 2001

Posts: 3,272

Pebble Beach, CA

Oyaji_Jon

Roll Me Over

Your problem sounds a lot like the one I fought for a LONG time. It turned out I had two vacuum lines backwards.

When the engine is cold, start it up and go to the EGR valve. Pull on the diaphragm and see if it acts any differently. If it does, you have a vacuum line on wrong somewhere. Mine turned out to be on the back of the intake plenum. If you look at the vacuum hose diagram, you'll see two fittings up there. Once I corrected the vacuum connections, it immediately started running correctly and passed CA smog the first time with flying colors. I promise you that it's the simple things that get you, and you don't want to know how much time/trouble that little vacuum hose cost me.

EDIT: Here is the quote from my thread on the old Black Raider I had.

Quote

Just a quick note to say that I found the reason this damn thing has been giving me fits at cold idle while waiting for the oil to drain. I had the #@%@$%^&#$%^#@% fuel pressure regulator going to the thermo valve instead of the plenum. switched the two vacuum lines, and badda-boom, runs like a CHAMP! ^@^&&#$%@#%#%...

Anyway, I'll be fuel economy increases drastically now, too. Hopefully, I didn't kill the cat or carbon up the system during my bout with stupidity. Off to get a smog check I go. I think I'll let them do a "pre-test" first. I don't need Sacramento to see this thing as a POS with the possibility of a CA buyer...

HTH

Last edited by Oyaji_Jon; 04/05/10 12:43 AM.

73
-Jon
KJ6GVM

As seen on Expedition with TX plates: VEGETARIAN - An old Indian word for poor hunter

Grampa's Trooper
1974 FJ40
1987 FJ60