Question about 1987 Mazda RX-7

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When i run my rpms up around 3500to 5500 and let off it blows a could of bule whight smoke it didon do it till i changed the coolent

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  • rosslong89 Feb 03, 2009

    thanks for the input i just started geting in to the rotary engs if it was a v8 id b fine but that rotary is diffrent im just woundring if it freeze & crack the cyl or strech the head bolts when i bought the car 3 weeks ago it teasted for 10 above 0

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Rotary engines don't have heads, or valves of any kind for that matter. If you changed your coolant to any kind other than the old green style you might have cleaned away the film or deposits that were protecting a crack in a dried out intermediate seal between the rotor housings and the side plates. Now when the rotors side seal rolls past the damaged section it sucks a little coolant into the rotor housing. But almost all rotary engines smoke for a while until they warm up as the oil injectors take a while to draw enough vacuum to lubricate the apex seals properly.

Posted on Feb 04, 2009

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Hi Ross,

I noticed a duplicate post, If you are having problems with the system, add a comment at the bottom of the screen.

As a rule:

  • Black Smoke = Unburnt Fuel, incomplete combustion, bad mix
  • Blue Smoke = Burning Oil
  • White Smoke = Water Vapor, Water getting where it shouldn't be.
White smoke is common in cold weather when you first start your vehicle. It's from condensation. But it should stop as the engine warms up. If it doesn't, the moisture is from another source.

Questions:

  1. Are the smoke episodes accompanied by a loss of power?
  2. Was your coolant level low before you changed the coolant?
  3. Did it overheat? Badly?
I'm leaning toward a partial failure of the head gasket. Here is some info, things to look for and tests to confirm.

Symptoms:
  • Uncontained compression in one or more cylinders = lack of power
  • Coolant seeping into cylinders through the gasket breach creates white smoke
  • Oil seeping into cylinders creates blue smoke
Things to look for:
  • Coolant levels low. As the coolant is burned off, you'll notice the levels are lower
  • Oil in the coolant. If oil is present in the radiator, it's coming from the engine. Another indicator of a failed head gasket. Only a confirmation though, lack of oil does not rule out the possibility.
  • Water in the oil. Pull the oil dipstick. Is it milky and frothy, like it's been whipped? If so coolant is getting into the oil. Again, an indicator, not a confirmation of a blown head gasket.
  • Is the oil level dropping?
The quickest, easiest and (most importantly) cheapest confirmation of this is to run a compression test on each cylinder. I'm surprised your mechanic didn't suggest it.

The test should show high and fairly close compression (100psi or more) on all cylinders. If any of them are significantly lower, something is allowing the gasses to escape. Since piston ring failures would produce blue smoke, not white, that leaves the head gasket.

If you feel comfortable doing it yourself, testers are available at any auto parts store for under $30.00. If you don't, any shop can do it in under half an hour.

All this is to pin point the problem. Then you know what you are dealing with.

Comment me back with your findings.
Mike

Posted on Feb 03, 2009

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2 Answers

My rx7 blows bule whight smoke when i let off


Hi Ross,

As a rule:
  • Black Smoke = Unburnt Fuel, incomplete combustion, bad mix
  • Blue Smoke = Burning Oil
  • White Smoke = Water Vapor, Water getting where it shouldn't be.
White smoke is common in cold weather when you first start your vehicle. It's from condensation. But it should stop as the engine warms up. If it doesn't, the moisture is from another source.

Questions:

  1. Are the smoke episodes accompanied by a loss of power?
  2. Was your coolant level low before you changed the coolant?
  3. Did it overheat? Badly?
I'm leaning toward a partial failure of the head gasket. Here is some info, things to look for and tests to confirm.

Symptoms:
  • Uncontained compression in one or more cylinders = lack of power
  • Coolant seeping into cylinders through the gasket breach creates white smoke
  • Oil seeping into cylinders creates blue smoke
Things to look for:
  • Coolant levels low. As the coolant is burned off, you'll notice the levels are lower
  • Oil in the coolant. If oil is present in the radiator, it's coming from the engine. Another indicator of a failed head gasket. Only a confirmation though, lack of oil does not rule out the possibility.
  • Water in the oil. Pull the oil dipstick. Is it milky and frothy, like it's been whipped? If so coolant is getting into the oil. Again, an indicator, not a confirmation of a blown head gasket.
  • Is the oil level dropping?
The quickest, easiest and (most importantly) cheapest confirmation of this is to run a compression test on each cylinder. I'm surprised your mechanic didn't suggest it.

The test should show high and fairly close compression (100psi or more) on all cylinders. If any of them are significantly lower, something is allowing the gasses to escape. Since piston ring failures would produce blue smoke, not white, that leaves the head gasket.

If you feel comfortable doing it yourself, testers are available at any auto parts store for under $30.00. If you don't, any shop can do it in under half an hour.

All this is to pin point the problem. Then you know what you are dealing with.

Comment me back with your findings.
Mike

Feb 03, 2009 | 1987 Mazda RX-7

2 Answers

My rx7 blows blue whight smoke


Hi Ross,

As a rule:
  • Black Smoke = Unburnt Fuel, incomplete combustion, bad mix
  • Blue Smoke = Burning Oil
  • White Smoke = Water Vapor, Water getting where it shouldn't be.
White smoke is common in cold weather when you first start your vehicle. It's from condensation. But it should stop as the engine warms up. If it doesn't, the moisture is from another source.

Questions:

  1. Are the smoke episodes accompanied by a loss of power?
  2. Was your coolant level low before you changed the coolant?
  3. Did it overheat? Badly?
I'm leaning toward a partial failure of the head gasket. Here is some info, things to look for and tests to confirm.

Symptoms:
  • Uncontained compression in one or more cylinders = lack of power
  • Coolant seeping into cylinders through the gasket breach creates white smoke
  • Oil seeping into cylinders creates blue smoke
Things to look for:
  • Coolant levels low. As the coolant is burned off, you'll notice the levels are lower
  • Oil in the coolant. If oil is present in the radiator, it's coming from the engine. Another indicator of a failed head gasket. Only a confirmation though, lack of oil does not rule out the possibility.
  • Water in the oil. Pull the oil dipstick. Is it milky and frothy, like it's been whipped? If so coolant is getting into the oil. Again, an indicator, not a confirmation of a blown head gasket.
  • Is the oil level dropping?
The quickest, easiest and (most importantly) cheapest confirmation of this is to run a compression test on each cylinder. I'm surprised your mechanic didn't suggest it.

The test should show high and fairly close compression (100psi or more) on all cylinders. If any of them are significantly lower, something is allowing the gasses to escape. Since piston ring failures would produce blue smoke, not white, that leaves the head gasket.

If you feel comfortable doing it yourself, testers are available at any auto parts store for under $30.00. If you don't, any shop can do it in under half an hour.

All this is to pin point the problem. Then you know what you are dealing with.

Comment me back with your findings.
Mike

Feb 03, 2009 | 1987 Mazda RX-7

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