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Author Topic:   Problem
mustangmadness
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Jan 2005

posted 01-23-2005 09:35 AM     Click Here to See the Profile for mustangmadness   Click Here to Email mustangmadness     Edit/Delete Message   Reply w/Quote
My first problem is that when i strat my mustang when its cold i have to unplug the MAP sensor. then after it warms up i can plug it back in. My old ecu died so i got a new one and the codes that where on after installation where 41 and 91 basicly saying the car is running lean. please help me figure out this one. I'm new on the board but still would like help. thankyou

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mustangmadness
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Jan 2005

posted 01-23-2005 09:56 AM     Click Here to See the Profile for mustangmadness   Click Here to Email mustangmadness     Edit/Delete Message   Reply w/Quote
just to add more to the problem i already gave you it smokes white really bad and leaves black marks on the ground where the exhaust hit the ground. 2 big black spots on ground and it also seem like something is getting in the oil

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Russ3747
Journeyman

Posts: 52
From: Raleigh, NC
Registered: Jan 2004

posted 01-23-2005 01:06 PM     Click Here to See the Profile for Russ3747   Click Here to Email Russ3747     Edit/Delete Message   Reply w/Quote
white smoke is burning water, any car will do this as the water is cleared out of the muffles but once it gets warm it should stop. if does it all the time you might gave a blown head gasket, cracked head, or block. check the radiator for oil and bubbles, check oil for water. it will look milkie if mixed.

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mustangmadness
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Jan 2005

posted 01-23-2005 06:10 PM     Click Here to See the Profile for mustangmadness   Click Here to Email mustangmadness     Edit/Delete Message   Reply w/Quote
It also weants to back fire. but only once in a while. Could the O2 sensor cause my pain in the butt problem

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ddenton749
Gearhead

Posts: 487
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 01-25-2005 08:52 AM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
You have both left and right sensors reading lean. This probably means you have a vacuum leak somewhere. Unmetered air is getting in somewhere and the computer is trying to richen up the mixture as far as it can go, but the O2 sensors are still seeing a lean condition.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

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mustangmadness
Journeyman

Posts: 4
From: Fort Bragg NC USA
Registered: Jan 2005

posted 01-28-2005 09:00 PM     Click Here to See the Profile for mustangmadness   Click Here to Email mustangmadness     Edit/Delete Message   Reply w/Quote
it smokes when it starts up but when it warms up it stops. But everyonce in a while it wants to back fire and it has great compression. 150 psi. in every cylinder. if air is leaking in or out of the upper intake manifold gasket will that cause my problem. please help

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ddenton749
Gearhead

Posts: 487
From: Kennett Square, PA, USA
Registered: Apr 2004

posted 01-31-2005 08:30 AM     Click Here to See the Profile for ddenton749   Click Here to Email ddenton749     Edit/Delete Message   Reply w/Quote
I suspect that the smoke on start-up is s seperate problem.

You have a vacuum leak somewhere which is causing the "lean" condition trouble code. I had the exact same problem with my Explorer. It turned out to be the gasket between the intake manifold and the fuel rail.

------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"Tank, I need an exit."
"I may not have gone where I intended to go, but I think I have ended up where I needed to be."
AIM, YM: topdnmustang

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