Prospeeder Posted December 27, 2006 Share Posted December 27, 2006 Grrrr some1 has to have an idea where i should start. I got everything back together, and the low idle problem is WORSE now. Now it starts, and then the fast idle kicks down to like 600, then it will slowly decrease the RPMs till its at like 200 and it will stumble badly. Good news, the intake backfires gone tho, and it revs fast. It also pulls harder through its powerband, but i notice sudden losses of power then it comes right back, its very odd. Im not sure if i should be looking at more vacuum leaks (wich im pretty sure there arnt any now) oxygen sensor? No Check engine light, the Coolant temp sensor has the wires directly solderd on. Do codes show up w/o check engine lights also? ill check for codes tomarrow if so Link to comment Share on other sites More sharing options...
ple1ades Posted December 27, 2006 Share Posted December 27, 2006 did you try the TPS? Link to comment Share on other sites More sharing options...
Prospeeder Posted December 27, 2006 Author Share Posted December 27, 2006 whats to "try" about it, like replace it, i have no MPFIs anywhere in the junkyards here, and im not sure on how to adjust it or anything seen somthing in the USRM about a loose mis adjusted throttle cable causing low idle possibly, mine has ALOT of slack, maybe this could cause this, mabye tightneing it up till the idle is better? cause the cold idle is controled by the computer. Ill try that tomarrow Link to comment Share on other sites More sharing options...
ple1ades Posted December 27, 2006 Share Posted December 27, 2006 check this link out http://www.ultimatesubaru.org/forum/showthread.php?t=56613 Link to comment Share on other sites More sharing options...
Prospeeder Posted December 27, 2006 Author Share Posted December 27, 2006 ah alright, ill try repositioning it then, and see what that does. When you did it, did you just move it, go for a drive, move it again, go for a drive? or could you tell by the idle? Link to comment Share on other sites More sharing options...
mikeshoup Posted December 27, 2006 Share Posted December 27, 2006 The TPS on your 86 is going to be completely different from the TPS in the aforementioned post. IMO, repositioning it is not going to help. It does NOT have a variable potentiometer. It has a closed throttle contact switch and a full throttle contact switch. The 83-86 MPFI systems do not use the TPS for accel enrichment like the rest of the FI systems do. Take a multimeter to your TPS and check for continuity. I believe the middle pin is ground and the outside pins are for the other switches. Verify that one switch is closed at closed throttle, and that the other one is closed at full throttle. That's all there is to your TPS. No repositioning will help. I do not believe your problem is the TPS. You need to run a compression test. Not to be alarming you, but rule this out. Link to comment Share on other sites More sharing options...
ple1ades Posted December 27, 2006 Share Posted December 27, 2006 I had to go drive it to really tell if it worked because my car would drive fine then stumble real bad like it was turning off. Even if I gave it more gas it would take a while to come back to life it was so bad I could not drive it. I had to play with it for a while to get it just right but after i did the car ran great. Now for some reason my car wont even start new problems not TPS. Link to comment Share on other sites More sharing options...
Prospeeder Posted December 28, 2006 Author Share Posted December 28, 2006 ok why would it be a compression problem, it ONLY does it when i drive the car, turn it off, and restart it, it idles really really low and stumbles, and if you drive it abit the idle stays a steady 900 now that i adjusted the idle, and adjusting the TPS got rid of ALL of my dead spots and made acceleration much more responsive it pivots and adjusts, so i think its only EA81T's or 85s or somthing). It now only does the low idle when u turn off the car and turn it back on. Driveing makes it clear up. What the heck do i check now?? (ITS NOT the head gaskets, OK? the engine has less than 30k on it and hasnt been overheated, doesnt burn coolant, doesnt overheat, or even get past 1/3 of the gauge, no bubbles, nothing! has great acceleration) Link to comment Share on other sites More sharing options...
mikeshoup Posted December 28, 2006 Share Posted December 28, 2006 I'm positive the 86 lacks the potentiometer. Your acceleration issues were caused because the car wasn't registering full throttle/was registering full throttle when it wasn't the case. I doubt the TPS will cause idle problems. But to be sure your TPS is adjusted correctly, pull out your multimeter and check continuity at full and closed throttle between the two respective switches. Low idle after hot start is a bugger. As if the AAV isn't opening up (the device on the thermostat housing), or a vacuum leak is introduced somewhere only at startup. I seem to remember my 86 XT Turbo doing that when I first got it. The AAV was full of oil and gunk. Check that maybe? I only mentioned compression as it can cause idle issues such as this. Checking compression is never a bad idea (especially if you have access to a tester) and gives you peace of mind that the engine in your vehicle is in good shape. Link to comment Share on other sites More sharing options...
Prospeeder Posted December 28, 2006 Author Share Posted December 28, 2006 so the AAV does control idle at cold and warm idle? does it just unscrew or is there spings and what not under it, is it just a simple valve, the conector has some MAJOR corosion, lol, whoops, ill clean that or try, and see if that helps, and take it apart and clean it, what should i clean it with? brake cleaner? or carb cleaner? unplugging it makes no difference to the idle at all wich is the wierd thing....maybe its not opening at all or energizing (BTW i appreaciate the help, i almost got this bad boy running good) Link to comment Share on other sites More sharing options...
Gloyale Posted December 28, 2006 Share Posted December 28, 2006 I've had 3 of these Ea82T's and all of them idled slighly low after a warm restart. 2 where the early stlye85-86 set up and the other is a 89 and they all do it. Not so much as to cause a stall but idle is around 500-600 when it should be 700-800. Idles fine after runnig again for a few minutes. Not saying you don't have a problem Just that a little bit of this is common in my experience and doesn't affect driving unless it is so bad as to stall. Link to comment Share on other sites More sharing options...
Prospeeder Posted December 29, 2006 Author Share Posted December 29, 2006 well, this is more like 300 or so, and its really rough because of how low it is. I guess its not hurting anything, but id like to solve it also if i over ajdust the TPS woudl that cause some really poor gas mileage? Link to comment Share on other sites More sharing options...
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