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91 Geo:idleing @8.5, when I turn on the headlights the idle drops to about 5 ish,then with wipers and fan down to total 4 ish. is this computor problem, or air idle control module?@ running temp.

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  • Cars & Trucks Master
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Verify the engine is reaching proper operating temperature first, if that is ok then do the following.

You can in most cases repair this stall or slow/unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.

Posted on May 16, 2017

  • 1 more comment 
  • Tim Morey
    Tim Morey May 16, 2017

    Thanks, Ill try it, thanks again.

  • Tim Morey
    Tim Morey May 20, 2017

    ok,IChecked the IAC its fine, no leaky,12vlts it works,power from the computer is ok,now what?

  • yadayada
    yadayada May 21, 2017

    You did not clean the system as described above. I never said it didn't work I said it is dirty.

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WHAT CAR WILL INERCHANGE WITH 94 GEO METRO FOR SPARE TIRE


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Oct 30, 2017 | Geo Cars & Trucks

1 Answer

Idle drops way low with fan,lights,ect..., on@ operating temp195, IAC is good power,no leak, power from computor;yes,under load, lights ect..,what am I overlooking? 91GeoMetro 3 banger


The electrical load on the alternator will pull the engine RPM down. It takes 10 H.P. to run the alternator. The only recourse to low RPM at idle would be to install a larger diameter pulley on the alternator. Extended idle could result in low battery charge rate. Should be fine at hi way speed. The alternator will not put out below 750 Rpm.

May 20, 2017 | Cars & Trucks

1 Answer

1993 geo tracker idle up and down


HOT ENGINE? (ill guess hot)
idle surges.(hunts) (very simple reasons or very hard to find.
the car has 2 engines. G16A and G16B
they work totally opposite, (8valve and 16v)
the vin number tells you the engine type ,digit 8 is engine code
6= G16B 16v
U= G16A 8v
i have factory book. its in chapter 0 these facts.
the cause of idle surge and hunt are:
1: ISC failures. the ISC can stick partially open and then hunts.
clean it and test it . see videos of how.
2: engine running so bad the ISC can nOT regulate idle speeds.

#2 is caused by up to 50 reasons.
8v , air leaks, cause racing idle and iSC goes nuts.
16v , all air leaks cause lean and if too lean the ISC goes nuts.

by nuts , i mean it hunts or gives up.

the list is endless, but the tests are basic,
i cant help you because no engine stated.

http://www.fixkick.com/IDLE-AIR/idle-index-home.html


ISC = IDLES SPEED CONTROLER (a system not just a PART)

Jul 08, 2014 | 1993 Geo Tracker

1 Answer

Idles@2500 rpm until engine warms up


old post
all do, everyone. but. the devil really is in the details with EFI.
this IAC valve does that,
to speed it up warm up , put in a 195F thermostat.
this assumes 800 RPM is hot.
most of these engines, do this. new. bewlow.

1: cold start, for 3 to 15sec, 2500 rpm , worse in alaska.
2: then the above DASH pot closes and IAC takes over, at ~1200
3: then as engine heats the IAC closed inch by micro inch a
its now 100% closed and the ECU not controls idle hot.
using the modulated ISC,
there is a fast idle feature on this year, 950 to1000 rpm hot
with these turned on.
1. headlights hot.
2: defrost glass, rear.
3: heater fan on.
4: a/c on if opted.
other wise 800 is normal hot.

Jan 13, 2014 | 1989 Geo Tracker

1 Answer

Idle speed valve


cold or hot. there are 2, on all suz engines (what transmission, 3sp,4sp or 5sp)
post symptoms, sure bad idle but hot , cold or both
hot means engine is at 180F or more holding......
is hot idle above 800 RPM or Below?
is the idle surging out of control hot?
Does hot idle (spec 800) drop in RPM with cab heat fan on and Headlights turn on at the seam time.? (yes, bad iSC funcition)
if ildle is low, say so, that is cause by other bad parts. (or set wrong)

Dec 11, 2013 | 1991 Geo Tracker

1 Answer

'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

Apr 15, 2013 | 1993 Geo Prizm

1 Answer

Replaced coolant temp sensor like diagnostic code said too didnt help none.it runs ok going down hiway but when i slow down or come to a stop it stalls out wont idle on its own.


There a 2 coolant temp sensors. One for the guage and the other for the computor. You need to replace the one for the computor. With a faulty coolant temp sensor for the computor, it doesn't recognize a cold start to cycle. You know when the engine idles higher when you first start it up in moring then the idle drops as the motor warms up.

Apr 05, 2010 | 1992 Toyota Paseo

2 Answers

FUSE BOX DETAILS


left to right...
1. empty
2. e flashers
3.horn, brake lights
4.clock, trunk light, inside light, radio
5. rad. cooling fan relay (AC only)
6. right side running lights
7. left side running lights
8. right high beam and indicator
9. left high beam and indicator
10. right low beam
11. left low beam
12. reverse,turn signal and inst panel
13. main and transfer fuel pumps, auxiliary air reg., ox sensor heater
14. license plate and glove box light
15. wipers
16. rear defogger
17. heater blower (no AC)
18. cig lighter
19. rad cooling fan (no AC)
20. Heater blower (AC)
21. rad cooling fan (AC only)
22. empty
23. Ox sensor, idle stabilizer,seat belt warning relay, (Digifant only, control unit, idle boost control, idle boost valve)
24. inst panel lights, heater control lights
25. reading lamps
26. empty
27. empty
28. empty

Hope this helps...;-)

Apr 17, 2009 | 1992 Volkswagen Fox

1 Answer

When i start my 92 geo tracker, it starts fine but about 5 seconds later, the idle drops significantly. enough so, that the car sometimes (usually) stalls and i have to restart it. it also stalls...


this is cause because the ISC is busted or can not open enough to keep idle at 800 rpm.

ISC , idle speed controller

but....
the car has a TPS switch on the throttle body.
if it fails to close at idle the ecu will never attempt to set idle.

or
car could be flooding. (too much gas)

you did not say if motor is 8valve or 16v and they are quite different EFI systems.


Feb 19, 2009 | 1992 Geo Tracker

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