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fanu88

unregulated engine running

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Hello everybody,

I am a new owner of Mazda 626, 1.8 petrol,1996. Please help me in 2 problems, which may be related:

1) When I press the acceleration more strongly (ex, overtaking) it seems like someone's throat, it doesn't accelerate, it doesn't pull and it feels interruptions. If I lift the foot off the pedal and push it easier it will recover.

2) While running, if I switch to neutral, the engine speed ranges from 1500-500-1200-700-1500 rpm and so on. When I stopped the car the engine speed at idle remains fixed at 1400 rpm.

       Where do I start from? 
I apologize for any translation errors (google translate).

 

 

 

 

 

 

 

 


 

 

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You might want to check your throttle body. 

Have you serviced it before? Seems like it's missaligned or clogged. (Don't touch the vents)

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I cleaned the throttle body, egr valve and changed the gaskets. If start the engine it sounds easy in the area of the throttle body as if it were pulling in false air.

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Sounds like you are describing a misfire under acceleration/overtaking. There could be an intake leak pulling extra air in. It could be a timing issue, especially if the belt is old or worn. It could be an ignition issue with the spark plugs, high tension wires, distributor if they are old or worn, or the timing advance mechanism if it is faulty. I have seen plugged catalytic converters cause problems like this, but not on a 626 before, and usually catalytic problems present with a distinct smell.

Surging idle when coasting is an odd one. Could also be related to an intake leak. Could be the idle air screw is too far open, but I don't know this engine well enough to know if it has an idle screw adjustment or not. Do you notice this problem when the vehicle is cold or hot? First start of the day only? Or only after having driven the car some significant distance? Throttle position sensor off-calibration could also cause an issue like this, but it would probably be all the time in neutral or park, and not just when coasting.

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