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Car shaking and Check Engine after heavy rain

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New User

Apr 24, 2017, 6:06 AM

Post #1 of 4 (767 views)
Car shaking and Check Engine after heavy rain Sign In

Hello, I will try to explain the problem in as much details as I understand.
I am talking about Mazda Protege 2002, 160k mileage.

1.5 years ago my car would die 10 seconds after start; it shaked on D (and not on N), then the Check Engine sign came and then it died. About 15 minutes later, when I almost arranged a tow truck to the mechanic, it actually got better and I drove it to the mechanic. They read the Check Engine codes and said that, in fact, it does not look right so I should drive it a bit until the actual problem comes out. I did so, and about a week later Check Engine sign came again and it turned out that it is a misfire due to old coil. So they repaired (replaced?) the coil, and it got fine.

Then in December I got the very same problem again, with the same symptoms. This time the code revealed a problem with some solenoid (solenoid 2?); the fuel was injected in too big quantities, so somewhere there was no oil at all, and it caused a misfire. So they repaired it.

But then, pretty soon, I started getting the same problem. The car was drivable, and, in fact, the problem would go away after like 5 minutes of driving. The Check Engine light would go away in 3 days. Today I got the same thing again. It shakes on D (especially when I do not press the accel. pedal) and acts normal on N. It begins to act as usual after 5 minutes of drive.

And - maybe it is important - I noticed a while ago, and today it confirmed, that this happens only after pretty heavy rains (the car is not in a carport or garage).

Could you please suggest what can it be?

The timing belt, as well as any other belts, was replaced long ago, somewhere at 100k miles. Other than that, I changed the oil frequently and kept an eye on the car.

Thank you!

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 24, 2017, 6:46 AM

Post #2 of 4 (757 views)
Re: Car shaking and Check Engine after heavy rain Sign In

I think you have the same problem missed a year and a half ago with a code reading that wasn't complete enough?

Try to get a better full code reading now and post the #s not a diagnosis.

Just good guessing as this is aggravated by rain like that you could try to mist plug wires and coil(s) and watch for arcing (sparks) run stray which it should never.

Point that out to someone where it was if you try that.

Hey - later when it says runs rich on this or that of course it senses that if no spark made it so takes interpreting codes they don't tell which item is a problem just the circuit and or on this isolate a cylinder at fault so can concentrate on that,


New User

Apr 24, 2017, 7:18 AM

Post #3 of 4 (750 views)
Re: Car shaking and Check Engine after heavy rain Sign In

Thank you for the response!

I forgot to say that, as the mechanic said, the original codes were not supposed to make a misfire, they should've only affected the performance.
I should also point out that the vehicle passed the emission test.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 24, 2017, 7:48 AM

Post #4 of 4 (726 views)
Re: Car shaking and Check Engine after heavy rain Sign In

Problem in INTERMITTENT so if not present for a period of time info is lost on what it was and just might pass a full inspection but it isn't right.

The right code readers will recall "pending" codes that haven't set off a warning light.
t. Those may only stay in memory for X # of starts and cycles of behaving then lost.

You don't want this this way as if not already it will kill a catalytic converter that might have been just fine otherwise.

The trouble with intermittent is if it hasn't left a good clue in a code and runs perfectly when checked with no memory of what you or mechanic is reduced to some educated guessing and time that it doesn't happen again which is not a cost effective way to approach problems.

That's why I suggested forcing the dampness with a mist, engine cool and see if that forces the problem when it would otherwise be gone if NO OTHER CODES CAN COME UP TO HELP. This is up to your mechanic to diagnose. You've stated it's gone on for a 1+1/2 years it's time to find it,


The clue is it doesn't like wet and worse when cold. When totally warmed up it would be able to dry itself off better and clear up.

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