Hey, me again here hehe.

So, today my 2m4 won't start, there is crank, there is fuel pressure, there is ecm (no codes) so I start to checking all connectors on the engine harness and I find there is a broken wire somewhere near the ignition coil.

Sadly seems the wire is not fixable since is broken on the end of the component.

Check the image.




Please if you know what is this and if this can cause the fiero don't start let me know.

Thanks in advance.

dont know about the 4 cyl but there seem to be the tach filter

yes that's the tach filter.

hold up I have a 87 2.5 am I suppose to have a tach filter cause my led tachs don't work right and Its new. theres nothing like that in my car

According to Google it seems it's the tach filter. Now, can this cause the fiero crank but don't start?

quote Originally posted by johnguzman1212: hold up I have a 87 2.5 am I suppose to have a tach filter cause my led tachs don't work right and Its new. theres nothing like that in my car

Whatever it's supposed to have, exposed copper wire being pulled out of the tach filter due to stress, isn't one of the things it's supposed to have.

Btw the wire is not just exposed, it's totally cropped.

I read this filter only controls the tachometer? So can this cause the start problem?

no, what I mean is I don't have a tach filter. theres nothing like that in my car. I was looking for it cause the manual said it had one. I have 2 led tachs my cheap one works fine but my big one don't work right and its setup right. do I need that filter? btw when I bought the car the speedometer and tach didn't work.

The wire only makes the tach read smoothly, if you think it is making the car not run then just cut the wire off and see if it starts. Larry

I jump the filter and the tach is back to work.

Also I detach and attach the distributor wires and now the car is running.

The weird part is sometimes when I stop at Red light the engine turns off by itself (hehehe like the Porsche Panamera) do you think this means my spark plugs or wires are defective? I think last time I change spark plugs was about a year ago.

quote Originally posted by johnguzman1212: no, what I mean is I don't have a tach filter. theres nothing like that in my car. I was looking for it cause the manual said it had one. I have 2 led tachs my cheap one works fine but my big one don't work right and its setup right. do I need that filter? btw when I bought the car the speedometer and tach didn't work.

I don't think the 87-88 2.5 have it, as they are DIS, IIRC.

quote Originally posted by alejandrissimo: I jump the filter and the tach is back to work. Also I detach and attach the distributor wires and now the car is running. The weird part is sometimes when I stop at Red light the engine turns off by itself (hehehe like the Porsche Panamera) do you think this means my spark plugs or wires are defective? I think last time I change spark plugs was about a year ago.

This is why you pull tach filter when have problem w/ HEI.
See my Cave, HE Ignition

If stil has problems shutting down:
plug and wire, likely not
coil and electronic in distributor, likely
bad wires or iffy C500 in engine bay, likely
even iffy ECM or wire/sockets to it, likely

Bad tach filter can kill coil and/or module.
shorted filter can keep power flowing thru the coil and coil can fry.

as for 87 engine can't see filter... doesn't use it.
Try start reading in my Cave, Duke Quick Ref and DIS Ignition

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

So I need to put a new filter then?

Thanks.

[This message has been edited by alejandrissimo (edited 06-09-2014).]

Remove filter.
Fix whatever else and drive to make sure.
install new filter.