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Why is car choking when accelerating?

Tiny
STELLAR
  • MEMBER
  • 2001 MAZDA PREMACY
  • 100,000 MILES
Auto 2000cc

Has had similar issue and had air filter changed but it barely accelerates now. Used to only do it in 3rd gears but gradually got worse an worse on a long trip I barely made it home its choking like power comes in and out and now it barely goes properly.
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Sunday, January 8th, 2012 AT 10:51 AM

22 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Remove the 02 sensor testdrive does the performance returns. Start with what fixitmr said first
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Sunday, January 8th, 2012 AT 6:14 PM
Tiny
VINNYPARRY
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  • 14 POSTS
Hi I ran it again tonight and its smoking as bad as ever I checked the pistons and there was oil on the top again I checked the compretion and its over 200 psi
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Saturday, October 20th, 2012 AT 10:17 PM
Tiny
CADIEMAN
  • MECHANIC
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Sounds like a valve stem seals. How many cylinders show oil?
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Sunday, October 21st, 2012 AT 1:19 AM
Tiny
VINNYPARRY
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  • 14 POSTS
Oil on all 4 cylinders the first head a changed all the stem seals it still smoked
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Sunday, October 21st, 2012 AT 8:29 AM
Tiny
VINNYPARRY
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  • 14 POSTS
If my oil control ring, s were knackerd would that explain oil on top of the pistons
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Monday, October 22nd, 2012 AT 8:58 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Are the plugs fouled and misfiring? What's the history on this problem? Seems like low mileage for ring failure unless you are not original owner and it was mistreated?
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Tuesday, October 23rd, 2012 AT 6:09 AM
Tiny
VINNYPARRY
  • MEMBER
  • 14 POSTS
Hi the history is this I bought the car with some smoke on start up then it would clear my first thought was stem seals so I replaced all seals and gaskets +stem seals the smoking got worse so I did the same again still smoking so I changed the head, the vales were dry when I put the new head on and yet again it smoked please help its driving me mad cheers mate. Vinny
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Tuesday, October 23rd, 2012 AT 4:46 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Since cylinder head has been done and redone a few times, guess you would have to look at the oil rings.
When replacing the head, was the intake manifolds soaked with oil?

Btw oil in the exhaust system takes some running time to clear and it could be up to a few hours of running.
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Tuesday, October 23rd, 2012 AT 5:07 PM
Tiny
VINNYPARRY
  • MEMBER
  • 14 POSTS
Inlet was wet so I disconnected the pcv so it could not draw oil in that way but it still smoked I have ran it the first time it cleared but the second time it did not but between me running the engine I changed the oil but just made it worse
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Tuesday, October 23rd, 2012 AT 5:19 PM
Tiny
KHLOW2008
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Did you overfill the oil?
Excessive crankcase pressure can result in oil getting to the intake manifold. Was engine heavily sludged when you first worked on it?
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Tuesday, October 23rd, 2012 AT 5:34 PM
Tiny
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Not over filled oil but was sludge when I start work on this engine
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Tuesday, October 23rd, 2012 AT 5:39 PM
Tiny
KHLOW2008
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Check PCV to see if it is clogged or heavily sludged.
On valve cover and engine block, check for other hoses or links from crankcase ventilation to the intake manifold. Ensure they are not clogged.
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Tuesday, October 23rd, 2012 AT 5:46 PM
Tiny
VINNYPARRY
  • MEMBER
  • 14 POSTS
I diconected the pcv valve and ran the engine it made no difference I cleaned all the ports in the rocker cover still no change I made sure the oil was dropping back down into the sump im still scratching my head
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Tuesday, October 23rd, 2012 AT 5:51 PM
Tiny
KHLOW2008
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Unless oil rings are very bad, otherwise they would not be leaving too much oil on the surface of the pistons.

Was the new head valve seals repalced and if yes, did you test if the valve seals were a tight fit?
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Tuesday, October 23rd, 2012 AT 6:02 PM
Tiny
VINNYPARRY
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I did not change stem seals on new head because they were dry when I fitted it and the company that I bought the head off offered me the coplete engine so I would think that there was no problem with the head and there was no sludge in the new head
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Tuesday, October 23rd, 2012 AT 6:05 PM
Tiny
KHLOW2008
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That leaves you with the block components to work on.
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Tuesday, October 23rd, 2012 AT 6:16 PM
Tiny
VINNYPARRY
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Yes and the only thing I can think of is oil control ring, s
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Tuesday, October 23rd, 2012 AT 6:17 PM
Tiny
KHLOW2008
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Yes, there is no other components that can cause that.
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Tuesday, October 23rd, 2012 AT 6:37 PM
Tiny
VINNYPARRY
  • MEMBER
  • 14 POSTS
I hope it is I have already spent 400 on this engine I have never come across this problem before but im not the only one its a big problem on the 2.0 mazda engine I have been searching you tube and its a big problem so thank, s for the advice mate. Vinny
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Tuesday, October 23rd, 2012 AT 6:41 PM
Tiny
KHLOW2008
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You're welcome and good luck.
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Tuesday, October 23rd, 2012 AT 6:46 PM

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