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help 2m4 won`t start

Printed From: West Coast Fieros
Category: Technical Topics Forum
Forum Name: Technical Questions and Discussions
Forum Description: Got a technical question about your fiero? ask it here.
URL: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=142
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Topic: help 2m4 won`t start

Posted By: Dyvyd
Subject: help 2m4 won`t start
Date Posted: 08 April 2007 at 6:20pm

Fuel pump froze put in new one no start fuel gets to injectors but injectors don`t spray. Put power to injectors and they work. put code reader on it flashes code 12 with ign on this according to book means everythings ok anyone know this stuff? I can play with any eng. but don`t know crap about car computers any help would be greatly an happily recieved. I will try your suggeston right away. thanks for your time. Dave Brown

Replies:

Posted By: Capt Fiero
Date Posted: 08 April 2007 at 10:08pm

Remove oil filler cap, have someone crank the engine over and you watch the rockers through the filler hole. If the rockers don't move, then you have blown the timing gear and engine will need to be removed to fix it. I will explain later.

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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.

Posted By: Capt Fiero
Date Posted: 08 April 2007 at 10:48pm

Ok back for a few mins. The 2.5 uses a gear drive timing system, the cam gear is made of a nylon like material. Over time and use the gear may brake or lose a tooth. If that happens the cam stops turning. The cam is what drives the distributor and inside the distributor is the pickup coil, the pickup coil is what tells the ECM to fire the injector(s)

So in short. One bad tooth on the cam gear and the injector won't fire.

Now on a lighter note, just double check that no fuses are blown.

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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.

Posted By: Dyvyd
Date Posted: 09 April 2007 at 6:12am

I am sorry for not saying this sooner I also poured some gas down the intake and varoom it goes till gass runs out

Posted By: Dr.Fiero
Date Posted: 09 April 2007 at 7:20am

The injectors get power all the time - the ECM grounds them (IT in your case!) to fire them.

Pull the clip off the injector.
Turn on the key, and meter out which side is power.
Now take a test light: Clip the lead to the battery, and probe the OTHER wire (that wasn't powered) on the harness.
Have a helper crank the engine. The light should blink every time the ECM fires the injector.

Does your tach needle move when you're cranking?

If not, replace your ignition module - chances are the ECM isn't getting feedback pulses from it, and it then won't fire the injector.

Posted By: Dyvyd
Date Posted: 09 April 2007 at 9:11am

Thanks for the help. I will try that this afternoon. thumbs up you guysand this site. everyone has been great since I joined up

Posted By: Capt Fiero
Date Posted: 09 April 2007 at 7:42pm

So whats the update?

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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.

Posted By: Dyvyd
Date Posted: 09 April 2007 at 9:36pm

after playing with it all day and getting nowhere my stepson looked at it for 10 seconds and found a freyed wire on the solinoid pulled it of and put a new end on it and vrooom it goes. kinda makes me feel stupid and proud all at the same time. Thanks again for the help.Dave

Posted By: Capt Fiero
Date Posted: 09 April 2007 at 11:25pm

Just be glad it was a simple fix. If it was the gear it is a hassle to do it.

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Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.