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Hi I have a 93 MX-5 1.6L I am having an issue with the engine. When I start off in 1st gesr I have to shift be for 2500 RPM's or my car surges and wont go past 2500 RPM and that's in all gears. I was tod it could possibly be the coil pack but I don't think that's right. Can anyone help please thanks in advance.

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does it happen when you start the car from stone cold?

leads or coilpacks.

Tired, faulty oxygen sensors can give that sort of problem around those rpm.... Does it clear up at higher revs?

tescoking wrote:does it happen when you start the car from stone cold?

yes from cold or hot I have to shift before 2500 or else it surges between 2000 &2500 the whole time.

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NMX516 wrote:Tired, faulty oxygen sensors can give that sort of problem around those rpm.... Does it clear up at higher revs?

no it doesn't clear up istill have the same thing

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First up, replace the spark plugs.

That will help the ignition, and at the same time give you a chance to look at the old plugs and gauge what's happening (really roughly, black sooty = rich, white crusty = lean.. you can google what plugs should look like. MX5s run slightly rich nomrally, so it's not abnormal to see black sooty)

Plugs should cost a total of $15-$20
If that doesn't fix it, well they were probably due anyway.



Is it load dependant? ie: can it rev in neutral ok? just while driving?
When my old plug leads started to die it would run fine without load, and misfire under load (it would then foul the plugs and make it misfire at all times)




There really needs to be a bit more detail.
Does it start ok? or need a fair few cranks?
Does it idle smoothly? or vibrate a lot? (possibly running on 3 cylinders)
Blowing smoke?
Is the timing set properly? (not overly advanced causing severe pinging?)

hks_kansei wrote:First up, replace the spark plugs.

That will help the ignition, and at the same time give you a chance to look at the old plugs and gauge what's happening (really roughly, black sooty = rich, white crusty = lean.. you can google what plugs should look like. MX5s run slightly rich nomrally, so it's not abnormal to see black sooty)

Plugs should cost a total of $15-$20
If that doesn't fix it, well they were probably due anyway.



Is it load dependant? ie: can it rev in neutral ok? just while driving?
When my old plug leads started to die it would run fine without load, and misfire under load (it would then foul the plugs and make it misfire at all times)




There really needs to be a bit more detail.
Does it start ok? or need a fair few cranks?
Does it idle smoothly? or vibrate a lot? (possibly running on 3 cylinders)
Blowing smoke?
Is the timing set properly? (not overly advanced causing severe pinging?)

my vehicle is fine whenever I take off when I shift into first gear it has to be at 2500 rpm anything over that my engine will Serge between 2000 and 2500 rpm there's no pings no rough idle if I rev the engine at idle it will not go past 2500 rpm's it fluctuates between 2000 2500 only if I rev it up

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Sounds like ignition leads to me.

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Black_Penguin wrote:Sounds like ignition leads to me.

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ignition leads?

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Whilst not surging, I had a NA6 that would hesitate/bog down at around 2,000 RPM and replacing the leads ($70 from Plus) fixed the issue.

93mx5 wrote: ignition leads?

AKA Spark Plug Leads



Should cost you around $50 for a set of 4 leads from Mazda.

J.

Second time in this thread they have been suggested. Pretty common symptoms for ignition issues.