Erratic Idle, Backfiring (Page 2/6)
Patrick AUG 23, 03:58 PM

Since this engine has been "modified" somewhat, and you're experiencing issues...

With the addition of a "cold" air intake, where is the MAT now mounted?

And out of curiosity, does this engine actually still have an EGR solenoid?
Addition1291 AUG 23, 06:00 PM
I've put in the new line connecting everything and it still acts the same. Nothing I do seems to help this issue. I'm getting pretty frustrated with this.

I have no idea where the MAT is. I'm not entirely sure that it has one. It does have an EGR solenoid.
tshark AUG 23, 06:18 PM
I do not understand how camming and boring an engine would affect timing. The cam shaft still rotates, as per usual. Ditto for the distributor and rotor.

The timing could be off.

The tach filter could be bad. You should disconnect it to test.

You should change your intake back to stock, with the MAT sensor.

Once you have tried those things, post back with your results.

[This message has been edited by tshark (edited 08-23-2019).]

Patrick AUG 23, 07:06 PM

quote
Originally posted by Addition1291:

I have no idea where the MAT is. I'm not entirely sure that it has one.



Well... quite possibly this is contributing to your issues.

The MAT sensor is normally attached to the stock air filter canister housing.

[This message has been edited by Patrick (edited 08-23-2019).]

fierosound AUG 23, 07:14 PM

quote
Originally posted by Addition1291:

Now my question is: Would it be kosher to run a vacuum line from there to this existing hole in the "cold" air intake? Nothing was there before, so it would make sense to me.



Find the MAT (Manifold Air Temperature) sensor and stick it in that hole.
It and it's connector should be in the front left corner where the original air cleaner was.
Follow the harness running under the decklid hinge.



------------------
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[This message has been edited by fierosound (edited 08-23-2019).]

Addition1291 AUG 23, 09:20 PM
I checked the distributor. Seemed fine.

I bought a new MAT sensor, installed it, and now the car won't start period. With or without the sensor, the thing won't start.

I can't win.
Gall757 AUG 23, 09:27 PM

quote
Originally posted by Addition1291:

I can't win.



Ah....but you are getting closer to the truth!...
when you have a modified engine, you need a larger tolerance for pain...

[This message has been edited by Gall757 (edited 08-23-2019).]

tshark AUG 23, 09:52 PM
Back up. The car started. You installed the sensor. Nor the car won't start. What else changed?

[This message has been edited by tshark (edited 08-24-2019).]

Patrick AUG 23, 11:28 PM

quote
Originally posted by Addition1291:

I checked the distributor. Seemed fine.



What and how did you actually "check"?
TM_Fiero AUG 24, 07:17 AM
Have you checked or replaced the coil?