idles but dies when reved

[mitsubishimanic]

i own a 1990 talon tsi awd. I bought the car with a fried ecu. OK im completely lost. i am fairly new to dsms still. i just swaped a 91 ecu and transistor into it and followed the tech guide on this site to a t. it also has a brand new coil pack, plugs, and wire. now the car starts and idles a little rough but if i give it any gas it trys to die. its giving me a CEL. also there clicking coming from what i think is the purge control solenoid valve. the pic shows whats clicking. also there are two vacume lines disconnected one is showen in the pic with red dashes on it. the other has yellow dashes on it any idea what those go to would be awsome.

 

[doayamaha]

Do the vacume delete and get rid of those and since you used a 91 ecu in a 90 and followed the guide I take it you switch the two ecu pins that you need to

 

[mitsubishimanic]

ill check out the vacume delete. and ya i swap the wires

 

[Indian]

This might help. You probably have a rats nest of vacuum leaks, so replace the lines as you go.


http://www.dsmtuners.com/forums/art...-speed-shop-vacuum-diagram-removal-1g-2g.html

It's a removal diagram but also shows where the lines connect. What code are you throwing?

 

[blessed1gst]

my idle was rough for a while and would die from a rev turned out my timing was off 2 teeth had my timing redone and it puurrrs

 

[mitsubishimanic]

i dont know what code it is cus i dont have a code reader. with that diagram can just cap the lines that are removed and run the lines as showen and the car will run fine. and i will cam teeth today. would the crank timing do the same thing as well

 

[widsmer]

ECU Code Checking

Try that

 

[JusMX141]

Makes me wonder how much more shit like this you have going on under you hood than you realize:

 

[mitsubishimanic]

yes it is kinda a mystery box but im not giving up. and about that vac delete diagram if i take out all my vac lines and re do them as shown my car under normal circumstances would run fine.

 

[JusMX141]

I repaired a 1990 TSi AWD for a customer one time who complained of a poor (very rough) idle that was not curable no matter what he did to the BISS. The underhood area looked similar to yours- plenty of loose ends on the vacuum lines, so I started ripping things out doing a vacuum line delete. What I found was two of the lines which go underneath the battery tray to the evap canister were either broken or had significant holes in them.

After performing the vacuum delete (blocking off the EGR), and getting the capacitors replaced on the ECU, the car ran absolutely great and idled as smooth as silk.

 

[Ghost1984]

I'm in the same boat with my 2g trying to fix all the crap the previous owner did to it. I'm gonna have to go through all the vacuum lines and probably do the delete as well. GRRRR!

 

[mitsubishimanic]

ok thank u for all the info but the car idles fine it dies if i give it any gas

 

[JusMX141]

Have you tried checking the fuel filter or fuel pressure regulator?

 

[mitsubishimanic]

ok when i got the car it moved it had leaky caps the second time i drove it the ecu fried. did the swap and now its throwing a cel and dies when givin gas. how would a car run if u swithched the wrong wires.

 

[JusMX141]

Depends on which wires you may have mixed up.

Sounds to me like the symptom of no Mass Airflow signal....the ECU is in limp mode.

 

[1GRedRocket]

Have you tried checking the fuel filter or fuel pressure regulator?

this was my first thought, second was vacuum leaks.
also if you can get a reader, finding out what code is being thrown could lead you straight to your problem so i would definitely try and find one for cheap or borrow one from someone

 

[mitsubishimanic]

ok so i screwed up on my ecu swap fixed it now my cels are gone but it starts and idles rough and when i rev it it goes up to 2 grand and wont rev any higher. any ideas.