idle problems need some advice??

[diamondsm]

1990 eagle talon tsi awd


car was sitting in a cow field for a few years just rebuilt the engine but have been having numerous issues first problem i had no spark second problem had no injector pulse i replaced the ecu that fixed my spark then replaced the mpi relay that fixed my injectors.......newest issue i got the car to be able to start but it will not idle right most of the time it will start up go to about 1300 rpm's and then die out but some times it while pumping the gas i get it to stay running but it jumps up to between 3000 and 4 rpm and holds there??


i have checked all my cauplers for my FMIC piping and the are all nice and tight

i did a vacuum delete on the car i now only have 3 or so vacuum lines (intake manifold to FPR, the waist gate T's into my BOV line witch go's to my intake manifold, and my break booster coming off the rear of my intake manifold....

i have plugged all the lines i believe ( 4 on the T/B, 4 on the FPR sensor, 2 on the EGR, and one coming off the fire wall from under my throttle cables can anyone think of any others??

when deleting all those do i need to leave the sensors plugged in and just plug the vac lines or do i unplug them ??

the sensors im talking about( FPR sensor and the one next to it...and there is one that went to my waist gate think its the boost controller??

 

[gofast63]

Check your tps sensor

 

[007jimmy]

Make sure your throttle cable is not too tight and do a boost leak test. More possibilities could be a faulty ISC or FIAV.. Just tightening clamps is not good enough. Pressurize the system with air and spray soapy water on leak points.

 

[92AWDHX40]

check the tps, isc, and do a boost leak test do that and let us know what you find.

 

[gofast63]

check the tps, isc, and do a boost leak test do that and let us know what you find.

I didnt even think of mentioning the ISC.

 

[punxnotdead185]

I vote ISC also, mine just messed up like that for no reason, just one day it would idle at like 3k rpms and sometimes it would go down to normal but only for a few seconds and it would just go right back up to 3k, it got a block off plate installed that day.

 

[AlaskanDsm]

You really should start out with a BLT with soapy water to make sure that the issue is not air leaks into the system as already stated. You should also try to see if the throttle plate assembly is not dirty and/or sticking. This can also be in conjunction with the throttle cable being too tight or out of adjustment as also stated. Try looking over this information to see if it helps.

(I realize that these are for Idle surge but they contain a lot of good information on testing the sensors too.)

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)
Idle Surge FAQ