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How do I adjust throttle cable on 1989 chev c2500 to raise idle speed throttlebody injection

I need to set throttle cable to raise engine idle speed. It stalls when I put it into gear otherwise it accelerates okay. The engine idle speed doesnt seem to be fast enough to keep from stalling.

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Can't adj..clean your IAC. Idle Air Control valve, or possibly replace it. The Computer adj's you idle by this valve moving in and out, it gets carboned up and does'nt move like it should.

Posted on Feb 14, 2012

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SOURCE: 1989 chev van w/ 350 backfires through throttle

check distributor cap and rotor button,pops and backfires under a load ,yes sounds like cap and button, hole to help robert b.

Posted on Jul 11, 2009

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I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured


fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

Dec 24, 2013 | 1986 GMC C1500

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My car, an xjs 4lt, 1996 cele', it has a aj16 engine, the idle speed is too fast & will not reduce, i've checked the butterfly & that seems ok, i don't know whether or not the step...


Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.----------

Getting this possibilities checked will help.Thanks.Helpmech.

Aug 31, 2011 | Jaguar XJS Cars & Trucks

1 Answer

Hi VW fans a 2007 Jetta 2.5 liter with a


The problem that you describe is in no way normal. That six second lag that you describe is more than enough time to get you into a serious accident. I have experienced a similar issue on Mitsubishi automobiles. When the hold down on the throttle cable is holding the cable too tight (not enough slack in the cable) or if someone has adjusted the throttle cable to remove the slack causing it to be too tight it will cause a fast idle lag like you describe. On several fuel injected cars stick and automatic I have experienced the engine rev issue you describe. Every time it was fixed by setting the cable tension back too loose.
Another item, if the cable slack does not fix the problem, fuel injected cars are fitted with an Idle Air Control Valve (IACV). They are located on or by the intake throttle valve. The price range for most is $30 to $100. If they malfunction they will raise the idle speed by letting too much air go around the throttle valve raising the engine speed even though the valve is closed. You can check if the throttle cable is too tight yourself. The IACV may have to be checked at the dealer. Only the dealer can tell you if the problem is covered under warranty.
As always check to make sure that there are no loose vacuum lines under the hood.

Mar 25, 2011 | 2007 Volkswagen Jetta 2.5 Sedan

3 Answers

Idle at 250 rpm


Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines. The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced. The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
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Aug 05, 2010 | 1995 Dodge Spirit

3 Answers

My 2005 altima idles high and engine code


This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

Jun 07, 2010 | 2005 Nissan Altima

1 Answer

I need to adjust my qcarb on 1985 gmc-pickup two wheel drive . i need to know what evey screw does


this truck doesnt have a carb, this has a throttle body, its fuel injected,there are no adjustments,every adjustment is done from the factory, the computer controls the idle,trying to raise the idle will throw the tps readings off,

Apr 22, 2010 | 1989 GMC Sierra

2 Answers

Air conditioning causes car to idle or die.


Depending on whether your car is Injected or Carby induction, The aircon system has an IDLE UP circuit which is supposed to raise the Idle while the Aircon Compressor is engaged. The Compressor cycles on & off to charge the system pressure as required. The Idle up system typically uses an IDLE UP SOLENOID which is usually mounted directly on the throttle linkage at the Carby or Throttle body itself, or a Vacuum Solenoid which switches vacuum to a Diaphram which is connected to a linkage on the Carby or Throttle body itself, or a Vacuum Switch which ports air into the throttle body to raise idle (This type on injected vehicles only). It sounds as if the IDLE UP system has failed or is not adjusted properly. Revving the engine spins the compressor faster thus charging the system sufficiently to dis-engage the compressor, which in turn removes the load from the engine, allowing it to idle again. A simple way to test is to disconnect the Aircon clutch wire (make sure it cannot fall into belt) & switch on the Air with the engine running. The RPM should raise typically around 300 RPM. If it doesn't the IDLE UP is not working. Hope this helps.

Dec 07, 2009 | Nissan Pulsar Cars & Trucks

2 Answers

Just installed new carb in my 1989 honda. Used diagram to connect vacuum hoses back up, but car idle speed is too high - up to 2,000rpm. What could be wrong?


try turning down the idle via the idle adjust set screw (usually on the carburetor base). if the problem persists after the engine is warmed up, there may be an issue with the automatic choke. also check the throttle linkage by disconnecting it to see if it is holding the throttle open when connected. if this is the case, you may need to adjust it or find a slightly longer cable.

Oct 04, 2009 | 1989 Honda Accord 4 Door

1 Answer

DIES WHEN I LET OFF OF THE THROTTLE


i recently worked on a 90 civic and i was able to adjust the idle by loosening the throttle cable near the throttlebody (there are a couple of nuts) and adjust it by moving the nuts along the cable adjuster by spinning them until the car idled well again and the owner has had no problems since
(it was not stalling but was very close to it especially at stop lights)
hope this works for you!

Feb 28, 2009 | 1988 Honda Prelude

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