Question about 2007 Isuzu i-290 Extended Cab

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With my 2007 i-290 4 cylinder on deceleration, while braking, with the ac on, the rpms fluctuate up and down from 1200 to 500?

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This is a compensative reaction from the emmission control center, it's really nothing to be concerned with.

Posted on Sep 06, 2009

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Why does my 88 ford bronco ii hiss when it decelerates from a rev up?


the hiss will be a vacuum leak as the vacuum is at it's highest when deceleration in engine rpms is occurring ( at idle reading is around 15" of mercury but on deceleration goes to high 20's
This will cause a hiss sound in and hoses ,pipes ,brake booster, auto tranny actuator or vent controls controlled by vacuum

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Car jerks rpms


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I have a 1992 Dodge Stealth that revs up to 2000 rpms when I engage the clutch on deceleration for about 5 seconds then idles back down to normal. Ant ideas? Thanks!


This is probably normal on this car. Most cars now days do this to prevent a stall when you suddenly decelerate. I know my 99 Intrepid did this and was normal.

Dec 24, 2012 | 1991 Dodge Stealth

1 Answer

When air conditioner is on, and the car is idling the rpms spike


You most likely have an AC compressor that is cycling on and off to often, this causes the RPMs at idle to fluctuate. The rapid cycling of the AC compressor is caused by a low AC system charge of refrigerant due to a leak in most likely the compressor shaft seal. Please have an AC repair ship confirm this educated guess..

Jul 15, 2012 | 2002 Chevrolet Cavalier

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My 98' Saturn Sl1 air conditioning does not work. Before I got my motor fixed it worked but now that I replaced it with a used new motor it wont blow out cold air. The Heater works prefect but the Ac...


If you didn't take the air compressor off the old engine then you probably have a bad compressor on the new motor. If you did then you may not have installed it or wired it correctly.

With the car in idle, turn the AC on and off and watch the rpms, they should fluctuate slightly when you turn it on and off, if they don't change at all then the compressor probably isn't wired to the controls.

The reason for the fluctuating RPM is that when the compressor kicks on it creates a load on the engine, which causes the rpms to temporarily dip down, the engine will then feed more gas to recover the original RPM.

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I have a 1998 GMC Sierra, 5.7 liter Vortec 4x4. It has 160k miles. I have noticed that it idles at around 500 rpms when its warmed up. Not sure if this is normal. However, I have noticed a bit more...


The normal idle for your engine should be 550 to 600 RPMS so thats not to far off . But the fluctuation is more likely the crank pisition sensor then the EGR valve this engine has a condution called crankshaft wip witch is normal but going down a rough road can somethimes set off a misfire code It wouldn't be a bad idea to take the EGR valve off and clean it and check it but the CPK would give you the fluctuation in RPMS . It still could be a few outer things but this it the most likely cause

Apr 02, 2011 | 1998 GMC Sierra

1 Answer

When I start the car, the temperature guage goes to the normal position, the air coming from the heat vents is cold. When I accelerate the temperature coming out the vents rises and when I decelerate the...


the temp senser is probably shot but easy to replace. i would start there its location is usually the radiator cap and some times on the side of your engine block. as far as fluctuation in temp upon rpms is unfixable, that is just something i call character.

Feb 10, 2011 | 2000 Lincoln LS

1 Answer

My 2005 Colorado RPM's fluctuate on a cold start up, from normal down to 500 Rpm. The truck starts fine, but as soon as I have to push the clutch in and stop, the Rpms will fluctuate about 3x and then it...


eddyblueange_2.jpgthis is an idle valve after 1996 the ecu control the idleing from the engine with this air by pass if this valve is geting bad it can get stuck open or closed or dont working right is an electric selenoid ......... listen for air leaks ....... wen you push the clutch you push the brake too check the brake booster

Dec 28, 2010 | 2005 Chevrolet Colorado

1 Answer

ABS light stays on sounds like a abs pump is staying on. Is there a pump for the abs system?


There is no seperate pump. The following lines will give you more details

Braking force and the tendency of the wheels to lock up are affected by a combination of factors such as the friction coefficient of the road surface, and the difference between the vehicle speed and the road wheel speed. The ABS prevents the road wheels from locking up during heavy braking by controlling the vehicle's brake system hydraulic pressure.
During normal braking, as the rotational speed of the wheel falls, no electric current flows from the ECU to the hydraulic unit. The solenoid valve is not energized. The brake master cylinder hydraulic pressure is applied to the brake unit, and the ABS is not involved. However, even though the ABS is passive during normal braking, its control module is constantly monitoring for rapid deceleration of any of the wheels.
If a wheel-speed sensor signals severe wheel deceleration - which means the wheel is likely to lock up - the ECU sends a current to the hydraulic unit. This energizes the solenoid valve. The action of the valve isolates the brake circuit from the master cylinder. This stops the braking pressure at that wheel from rising, and keeps it constant.
If the sensors signal the wheel is still decelerating too rapidly, the ECU sends a larger current to the hydraulic unit. The armature moves even further and opens the valve. It opens a passage from the brake circuit. Brake fluid is sent from the brake circuit back to the master cylinder. Pressure in the brake caliper circuit is reduced so that the wheel is braked less heavily.
If the wheel sensors indicate that lowering the brake pressure is letting the wheel accelerate again, the ECU stops sending current to the hydraulic unit and de-energizes the solenoid valve. This lets the pressure increase, so that the wheel is again decelerated.
This cycle repeats itself about four to six times per second.
It is normal in an ABS for the valves in the hydraulic control unit to keep changing position as they change the brake pressure that’s being applied. These changes in position may cause rapid pulsations to be felt through the brake pedal.

Jun 06, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

When foot is on brake it hisses under dashboard rpms rise brake goes all the way down what is the problem


This is your master cylinder diagraphm is having a problem. It will either need to e repaired or replaced. The master cylinder is located behind the firewall right behind your motor on the drivers side of hte vehicle

May 21, 2009 | 1995 Pontiac Grand Am

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