Question about 1987 Mazda RX-7

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My rx7 blows bule whight smoke when i let off

Between 3000 & 5500 rpm when i let off it blows alot of smoke it didon do that untill i changed the coolent

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  • Mark Egan May 11, 2010

    Why did you change the coolant?

    And are you sure it didn't do it before you changed coolant?

    The smoke you describe, and the timing of when it happens, normally indicates bad valve stem seals (high vacuum when lifting off the pedal).

    If this is a turbo, there could be something going on there as well.

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Justin case you are a *****! Suggesting that the car may have a head gasket!!!! And I quote " Again, an indicator, not a confirmation of a blown head gasket." this car does not have a head gasket!! If you do not know your RX7's do not try to diagnose them!!! The wankel type motor behaves completely different to any other and does not conform to the otto cycle!

Posted on Aug 14, 2012

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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

Posted on Feb 03, 2009

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Mike258
  • 1498 Answers

SOURCE: 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

Posted on Feb 03, 2009

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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

2 Answers

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


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

Feb 03, 2009 | 1987 Mazda RX-7

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