Problem - Misfire
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sily ones now
manifold/ downpipe blowing possibly
or a bad earth somewhere
i kept having a missfire at ow revs
and tured out to be the neg on the battery had worked loose??
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Doesnt seem like the downpipe is blowing.
I can hear a kind of sucking when opening the throttle at idle which conicdes with the missfire at low revs.
If i put my ear over the engine it sounds like it is comming from the air intake gasget where the intake plenum connects to the body of the engine.
Would this need changing?
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sounds like that could be your problem! Or at least worth a look… I replaced my IM gaskets, 10er each of probestore. Mine were completely knackered - theyre metal with some plastic coating and the plastic was in bits. Better that than your IM being cracked...
My gaskets:
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Thanks for the pics.
Just purchased gaskets from ford probe.
Hopefully that will fix my issues…..
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Np, good luck with the gaskets. If thats not the problem I bet they needed done anyway ;)
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high revs the engine just seemd to die / backoff which i immidiatley
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missfire at low and high revs.
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if you set the car in idle then floor it it just coughs and splutters alot where as if you gently press the throttle it doesnt do it so much
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I recently changed the Distributor because it broke.
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I have tried changing the Spark plugs and ht leads but still the problem occurs
IT SEEMS TO STRUGLE WHEN THE ENGINE IS UNDER LOAD
1) IGNITION
First I would have looked at Battery, Sparkplugs and Leads.
(but you have checked those so we can rule that out)
And if your getting a decent spark, we can rule out ignition problems.2) QUESTION
Next I would ask about changing the dizzy, did you have this problem before you changed it? How soon after you changd it did the problem start?Make sure you put all the leads back correctly!
(assuming you swaped it ok and put everything back right)3) FUELING
Next I would be thinking is it a problem with fueling as it seems to occur when under load, so maybe you have a sensor out.- AIR: VAF sensor?
- TEMP: Coolant Temp Sensor?
Let us know how you get on.
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Thanks for the tips.
Will double check the spark plugs / leads but im pretty sure they are ok.
As for the dizzy change, no it was fine before i swapped it. After it was ok for ~6 weeks then faild on the way home from work.
All the leads are back ok, i made sure that i changed one at a time.
On the note of sensors. I did a dignostic check earlier and found that it was giving error code 12. TPS Sensor failure.
Would this give the symptons that i am having? Would the TPS Error be related to the IM Gasget sucking problem?
How would i check the VAF sensor?
Rob
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Yes the TPS sensor is your problem.
It is the Throttle Position Sensor I'm guessing, and that tells the ECU what position your throttle butterfly is in so that it can alter the fueling when you accelerate.
It is attached to your throttle body, I'm not sure about the MX3 but on some cars its easy to change just the sensor, but on others just swap the whole lot. You can pick that stuff cheap from a scrappy and they will let you take it back if its faulty.
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The sensor might not be set right, its adjustable by about 15 degrees, but the sensor can be taken completely off the throttlebody
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Just waiting for a sensor to arrive then will give it a go….
Hoping to get it fixed soon.
Rob
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Had a similar problem with my k8. My catalitic convertor had collapsed and was restricting gas flow.
