new replacement engine blows blue smoke

8

87 GT

New Member

May 6, 2005

19

0

1

Iowa

Aug 28, 2006

#1

• Aug 28, 2006

• #1

We installed a junk yard 5.0 HO engine out of a '91 Mustang with 30,000 miles on it into my son's '89 LX this weekend. While test driving it, after a good warm up, it blows blue smoke out both exhausts when accellerating hard. What could be causing this, and how do we test to narrow the problems down? Can the EGR system cause oil to be burnt? Rings? Valve seals? Do we have something hooked up wrong with wiring or vacuum? Help!

 

stang8urimport

Autozone Junkie

Founding Member

Jun 21, 2002

1,499

12

59

Daytona Beach, FL

Aug 28, 2006

#2

• Aug 28, 2006

• #2

If it happens when you get on it, more then likely it would be a ring problem... Do a leak down and compression test to narrow down which cylinder(s) are causing the problem.

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,016

1,613

194

NJ

Aug 28, 2006

#3

• Aug 28, 2006

• #3

Check all intake gaskets.

You sure the mileage is 30,000? and not 130,000?

 

s&k stangs

New Member

May 24, 2006

0

0

0

MOnroe, Nc

Aug 28, 2006

#4

• Aug 28, 2006

• #4

Mine blows smoke, I changed the plugs this weekend and found oil covering #4 from electrode to the threads, so you may want to pull the plugs and maybe that'll help pin it down?

 

P

PJB

New Member

Aug 22, 2006

131

0

0

Rotterdam, NY

Aug 28, 2006

#5

• Aug 28, 2006

• #5

Gotta love how junkyards lie. I bought a motor for a '96 Blazer at a junkyard and they told me it only had 86k on it.

I went back there for some other parts for the truck and looked at the Blazer the motor was from and it had 113k on it.

It burned oil too. Atleast the bearings were ok unlike the motor I replaced.