Question about 1990 Mazda MPV

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During damp weather the engine light comes on, car runs rough at first then runs ok and within a day or two the engine light goes off

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Check spark plugs, leads if fitted or ignition coils sounds like spark is "jumping" due to poor insulation, cheapest option is to try plugs first then leads( if fitted) if it is induvidial coils, wait untill engine is running ok then spray water on each coil in turn and not the effect

Posted on Jun 04, 2010

Testimonial: "Thanks! Someone did suggest the spark plugs. I will do that next"

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2006 ford free star when it rains the PCM gets wet and runs rough. Today it has rained for 3 days @ won't turn over. Battery is fine. Only a problem when it rains.


Rain should not affect your car starting. It sounds as if your battery is failing. Put your headlights on and get someone to turn the key with you looking at the headlights. If they dim to a glow-worm, your battery is not powerful enough. Sometimes a cell will fail and although your get 12 volts, you don't get enough cranking amps.

Regarding starting in damp weather, you can try this. Spray all the ignition leads with WD40 and also the inside and outside of the distributor cap. You can also try this which worked for me on an old Datsun that didn't like damp weather. Get some broadsheet newspapers and tape them together to make one large cover for the engine compartment. Make is about 10 sheets thick. Run the vehicle with this all over the winter. When you drive the paper warms and keeps the leads warm. When you park, any moisture in the air goes into the paper and doesn't condense on the ignition system. Make sure the paper is away from moving part like the radiator fan and the exhaust manifold. Check it after your first short drive, it should stay in place.

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I have a 2008 Suzuki sx4 and it squeals shifting between 2nd and 3rd gear, also when it rains the check engine light comes on for a day or 2, please help


the check light means , scan me.
you scan or they scan, (pick one)
ever get tuneup ever (the 60k miles are important) skip those?
my guess is spark goes bad, wet (damp weather)
and sets P030x codes (DTC errors) called misfire.

the squealing is fan belts, also on the 60k list. bad.

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new spark wires. old wires hate, cold damp weather.
spark plugs, cap,rotor wires, try the 60k mile tuneup. per the opr.guide.
magic happens....
the map is ok.
and to test a map you need the graph and you need to compensate for altitude and local weather (barometer readings) to correct what you see.
is the check engine light glowing running?
most maps read like this, 1bar maps.
http://www.fixkick.com/sensors/my-map.html#Jeep

i bet your's is ok. the map.
your car is a toyota corolla in snake clothing.
the toy FSM covers this is find details.

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1 Answer

Our chev 2003 pickup will get reduced engine power. We can pull over kill it a couple of times and go again but the engine light stays on but it may do it several times within a 20 mile drive. Then if we...


Since I have no idea where you live and what the weather is, I am asking if your engine is carbureted. In cold and damp weather, I had a similar problem which was cured by warmth from the engine heating the carb. (It was called carburetor icing.)

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1 Answer

My ford windstar 2003 hesitates during cold weather or wet conditions. But good during idle. Some time shows blinking engine light.


The flashing and rough running is to to a misfire or misfires cause by arcing due to moisture on ignition components. Eventually these misfires can lead to other problems such as damage catalytic converter. Start by identifying which cylinder(s) is/are misfiring. The arching can be reproduced with a spray bottle filled with soapy water. Spray the ignition components (wires, coils, distributor cap...)and look for the vehicle to idle rough. Replace any faulty component.

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1 Answer

I have a 1994 Firebird 3.4 that runs rough intermittently when warm.


I can't imagine anything being affected by changing the oil other than the valves in the heads. I assume you have good oil pressure hot or cold. I suppose you could be moving a wiring harness around when you take the oil filter off.
It would depend on if the rough running is mechanical or fuel or ignition related to say what to check first. I would have to figure out which area is affected first.
Something like a sensor or a dead miss on one cylinder could turn the check engine light on, but most fuel and mechanical issues will not do it on a car of that year.
If one of the coils was failing when the engine is hot, changing the oil should have no effect.

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1 Answer

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Your oil is a little low, and the timing may be off a bit but if it smooths out after warm it is probably ljust
low oil.

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Replace the distributor cap, rotor and ignition wires with Genuine Nissan Parts and you should be ok.

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