1G 1992 eagle talon runs bad.

[19Collin92]

I need help with this thing to run right. First of all it takes about 5 or 6 cranks before it will start the engine then it will sit there and idle surge till the engine temperature goes normal then the idle sits at about 900 to a 1000 rpm steady. Second when I rev up the engine a little it just rolls black smoke like crazy and I was wondering what would do that and it is getting about 10mpg.

 

[tmoney20g]

my first guess would be a fuel problem, with a stuck open injector (or two). can you give us any background/mods on the car ?

 

[19Collin92]

Well I just put new valves and all new belts in and the timing is spot on it runs just fine, besides the idle surge when it is warming up. It had bent valves for a long time and it was sitting for 4 or 5 years before I got it fixed right. I did fill it with new fuel also but it only gets 10 mpg which is terrible. No mods just a base model.

 

[mitsubishikid]

Could be a bad FIAV,coolant sensor, mas sensor, or a bad ISC.
Also did you do a boost leak test yet?
black smoke would indicate a rich mixture.

 

[19Collin92]

I will check those sensors and the injectors and I do not have a turbo on it yet.

 

[DSM1G90]

Sat 4 to 5 years...did you do an oil change as well, for that oil is probably all gone to varnish and sludge along with mixed in with water due to condensation.

If not, get it changed pronto with two quarts of dino, and a quart of ATF and give it a good flush out for 20 min on idle, then dump it and refill with new oil.

 

[19Collin92]

It through codes 12, 13, 21 and 25 could any of those cause the car to blow black smoke.

 

[SrKegler]

Throwing that many codes usually indicates a blown ground in the ECU.

 

[mitsubishikid]

code 12 is the air flow sensor, code 13 intake air sensor,code 21 is engine coolant temp sensor, code 25 is the Barometric Pressure Sensor.

code 12 is in the maf, code 13 is again in the maf, also code 25 is located in the maf so something wrong with the maf or it's wiring definitely inspect it.
and code 21 being the coolant temp sensor.
So this could be two parts throwing the codes,or it could be the result of something else, I think you should start with both of these sensor, you should inspected and or test both of them.

 

[Lolmooses]

The idle surge only until warm is a shot FIAV guaranteed. I have the same exact thing and tapping on the FIAV would change the way it idled until I stopped tapping on it.

 

[19Collin92]

I fixed it, and the funny thing is it was all in the ECU throwing false codes so I changed it to a old one that I had and now it has no codes and running like a champ.

 

[tmoney20g]

don't throw that ecu out, open it up, take a picture of the circuit board, and let us know what it is ? it could be of use to us here. thanks in advance!

 

[19Collin92]

All right I will open it up and take a picture of it so everyone can see what it looks like.

 

[Lolmooses]

Must be a typical corroded ECU if it was running like crap and throwing a bunch of random codes.

 

[mitsubishikid]

Glad you got it all sorted out man.
It Could be the obvious legendary leaking ecu caps syndrome. oh don't forget, when you post up pictures of the bad ecu, also post up the Mitsubishi part number that is on the bad ecu.