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Recent work done on engine

Tiny
1990MAZDA
  • MEMBER
  • 1990 MAZDA 626
  • 159,000 MILES
About a month ago, my car started blowing blue and gray smoke with oil out of the tailpipe. Went on the internet and bought the following: an engine rebuild kit, new turbo, downpipe, changed the timing belt and water pump, changed the thermostat and the head gasket together with the valve seals. After all that, the car still blows blue and gray smoke out of the muffler, the smoke has an odor, not rotten eggs but different. The new headers turn red cherry hot and it almost overheated. Any advice would so much be appreciated. Thank you.
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Sunday, May 26th, 2013 AT 8:53 AM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Did you replace the valve seals, and red converters sounds of running lean so check for vacuum leak or low fule pressure.
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Sunday, May 26th, 2013 AT 9:09 AM
Tiny
1990MAZDA
  • MEMBER
  • 5 POSTS
Yes, the valve seals were replaced. Could the catalytic converter be clogged? Can the timing being off also cause this? Also it takes me 7 tries for the engine to start. (I have a brand new starter). Is it the timing being off? Thanks so much.
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Sunday, May 26th, 2013 AT 9:13 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the timing belt were off i'm sure this would have bent valves in engine. Check for a vacuum leak and fuel pressure like I stated earlier.
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Sunday, May 26th, 2013 AT 9:25 AM
Tiny
1990MAZDA
  • MEMBER
  • 5 POSTS
If indeed it is the two that you mentioned, which parts do I need to buy to fix the issue? Do I buy a new fuel pump or fuel pressure regulator? And what about the vacuum leak part? Would it be wise to buy a new catalytic converter since I have never replaced it since 1990? Thanks.
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Sunday, May 26th, 2013 AT 9:32 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You'll need to check your fuel with a gauge they can be rented at auto parts. Choke spray to check for vacuum leaks and put a vacuum gauge on the intake and see what it is I wouldn't replace the converter yet. If your vacuum is 15" or below the converter may be plugged but it won't cause smoke.
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Sunday, May 26th, 2013 AT 9:36 AM
Tiny
1990MAZDA
  • MEMBER
  • 5 POSTS
One last question please. Why are my headers running red hot right after I start the engine? And the smoke out of the muffler even after I replaced the head gasket? And after 10 or more minutes, the car wants to overheat. Thank you again.
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Sunday, May 26th, 2013 AT 10:06 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
My advice to you is to take this to apro as you have screwed something up doing your gasket replacement thing. I have no idea what you have done and if you would do what I've told you a lot of thistuff would be solved but obviously you don't want to do it. So take it to a pro I have no further suggestions.
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Sunday, May 26th, 2013 AT 10:48 AM
Tiny
1990MAZDA
  • MEMBER
  • 5 POSTS
I never touched the car myself. I had a pro (Mechanic) do it since I do not own any tools. When he was done with the car all he said to me was that he is out of options on why the car smokes.
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Sunday, May 26th, 2013 AT 10:51 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then tak it back and tell h im what it's doing, something has been done with it that isn't right. If the mechanic that did it screwed it up take to another and tell the one that screwed it up he's goin gto pay for it if not there are always the courts.
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Sunday, May 26th, 2013 AT 10:56 AM

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