jinxd12

so i have gone through everything that controls idling and now i am wondering if its either my stock tps or my iacv? i have pulled the iacv off and cleaned it and also the thing under the throttle body. ive have read maybe my tps is bad, but i am thinking of drilling it off and trying to readjust it since its from 94 anyways?? should i do this? also i cant find anywhere that sells iacv less than almost 200 bucks..im goin nuts here cuz im stuck with an idle at 2500+ and cant even drive it right now

Former User

If you cover the top of the throttle body with your hand and the engine does not die, then you have a major vacuum or intake air leak.


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Thread title edited.

jinxd12

cover the top? u mean take the intake off and put my hand oner the opening?

Former User

Yes, or a piece of wood (something that won't be sucked into the IM).

jinxd12

ok ill be right back ill let u know what happens!

jinxd12

ya it died that **** hurt puttin may hand on there haha..but i just read theres the 2 lil holes in there also...the top one i put my finger on and my car dropped down rpms like crazzyyy, so that means bad iacv huh??

Former User

What year and specific engine? What's the set up?

Does the hole/port lead to the IACV or the FITV?

What happens to the idle if you unplug the IACV?

Any CEL codes?

jinxd12

94 del sol b16, the hole i covered goes to the iacv, when i unplug it it drops, but i read its supposed to go higher? ya theres a check engine code, but idk how to read it?

jinxd12

ok i found them i have 6 and 7..also i had 14..then i reset it by unplugging the battery...now i only have 6 and 7 and still idling like crazyyy

Former User

Depends on the engine set up how the IACV responds to being unplugged. Based on your test, it seems that the IACV is receiving a signal to remain open when it shouldn't.

Click the CEL sticky at the top.

Former User

Code 6 (ECT sensor) and 7 (TPS) are common causes for idle problems. Focus on fixing both codes. Make sure they are plugged in and their connectors are not accidentally swapped to other sensors.

jinxd12

can u tell me where the water coolant temp sensor is?? i still have the stock tps so maybe it went bad? or needs to be drilled off and tuned again?

Former User

It's the 2-wire sensor below the distributor.

Measure the output voltages at closed (~0.5V) and wide open (~4.5V) throttle to make sure it is properly calibrated.

And double check for swapped sensor connectors.

jinxd12

yes ive done a tps before thank you! ya the ect, i actually just got a pigtail for it today, do u know if the red goes on the left or right side of the plug? the green plug correct??

Former User

Does it have a Grn/Wht and Red/Wht wires?

I don't believe the wire orientation matters, though I am not absolutely sure.

jinxd12

yes its green and white/ red and white

Former User

Those wires are definitely for the ECT sensor.

What are the wire colors in the connector attached to the TPS?

jinxd12

hold on wait, what are u asking me..my map sensor colors i have are yellow w red stripe...green w white stripe..and white...and the tps colors are green red and yellow

i just checked my codes again i unplugged everything and put them back on and now i only have #6?? coolant sensor, would that make my idle go crazy? im still thinking tps or iacv?

Former User

MAP sensor should be:
Yel/Red, Grn/Blu, Wht

TPS should be:
Red/Blu, Yel/Wht, Grn/Wht


Reset the ECU, run the engine for a minute or two, and then pull the codes again. Do you still only get code 6?

And yes, a faulty ECT can cause the idle problem you are having. Stay focused on the ECT sensor, as well as the TPS if code 7 pops up again.

jinxd12

ya ive been playing with it, still just a code 6, i am really stumped...how much does an ect usually cost??

jinxd12

also my car is at like 2500 rpms as soon as i start it, you dont think thats high even for an ect??

Former User

Is the ECT sensor connected to its plug? If so, bring the engine to operating temperature, turn the ignition switch off, unplug ECT sensor, and then measure resistance across the two sensor terminals. It should read 200-400 Ohms.

jinxd12

ya its a single wire correct..its green w white stripe i think? or is it a 2wire?? if it is the 2wire, what is the single wire one down at the bottom??

jinxd12

http://www.rywire.com/store/images/x_hts_gsrplugs1.jpg

im guessing the coolant temp guage in this pic right? well i only have 1 wire how do i measure ohms on 1 lead??

Former User

You should see the 2-wire ECT sensor just forward of the 1-wire sender unit.