Jumpy tack

teamhavok2 · Post by **teamhavok2** » Tue May 08, 2007 12:57 pm

My GT has a newish motor slapped in and not very well. Already found 2 vacume hoses not plugged in one being the main to the vacuume silinoid. The tack has been jumpy and will jolt if you let it jump for a bit. When sitting it will jump a little and turn off. Was told by a local it might be a bad ground (fiberglass) that the mechanic put in. Any ideas what it could be?

Starlite528 · Post by **Starlite528** » Tue May 08, 2007 8:54 pm

Check to make sure that all vacuum lines are going where they are supposed to go, there's a map on the underside of the decklid.

If vacuum is applied to the EGR solenoid while the engine is idleing, it will stall out.

Series8217 · Post by **Series8217** » Wed May 09, 2007 12:30 am

The tach turns off or the engine turns off?
Could be the pickup coil in the dist..

teamhavok2 · Post by **teamhavok2** » Thu May 10, 2007 2:16 pm

it's a brand new distributor including pick up coil and modual. I didn't buy it so i changed the modual with a new one (cheap and had one i was going to use on my last fiero). Car still jumps and engine will stall out when it idles. No spark afterwards. I'm going to follow the lines again but I am 99% sure they are all going to the right place. the ignition coil looks old but not sure that would do it. Put on new spark cables because they had some older ones on it.

Forever-Fiero · Post by **Forever-Fiero** » Thu May 10, 2007 7:32 pm

Tack Filter :thumbleft: Little thing with two white wire's and a white plug. It's just behind the coil.

Xanth · Post by **Xanth** » Thu May 10, 2007 10:08 pm

That can be the problem, I believe the method to check it is jumper it out. Simply jumper the two terminals in the connector, on the wiring harness side. If the tach is still wrong the filter is not the main problem. I jumped mine out and it still reads way high.

teamhavok2 · Post by **teamhavok2** » Fri May 11, 2007 9:18 am

Could it be the vacuume silinoid? seems like if the vacuume is junk and block off from the vaccuem to the egr is not working properly then it would do the same as if i was applying direct pressure to the egr even when idling? That was my orriginal gut feeling but after taking it to a shop they told me to just replace the ignition system and that didn't work. If it was the tack filter wouldn't the problem only consist in the tack? this problem hits the engine and makes the tack jump because it's reading it. I'm still learning but it seems like if my home computer fried I wouldn't change the screen that reads the computer. thanks guys

teamhavok2 · Post by **teamhavok2** » Fri May 11, 2007 3:30 pm

I had a broken plug @ the module and have fixed that (the one from the ignition coil) and after that i swapped out the modual with a new one in case I fried it. While doing that i noticed that there are just to sleeved wires that connect from the coil to the modual. Last few fieros i had clipped on to the modual. This was a new looking distributor with the star style but I'll take a good look at it after work to see if it's been spliced.

Post by **eHoward** » Sat May 12, 2007 1:30 pm

I moved this.

Weponhead · Post by **Weponhead** » Sat May 12, 2007 5:43 pm

teamhavok2 · Post by **teamhavok2** » Tue May 15, 2007 2:29 pm

would the gasket for the egr not being glued cause this? it's on tight but the person that put it in didn't seal it

teamhavok2 · Post by **teamhavok2** » Mon May 21, 2007 2:22 pm

turns out the gasket was reused when they installed the engine. sealed it and it made the problem disapear. Think i might reseal the egr tube in case they did the same thing there.