Pulsating Idle

[tjh]

Pulsating Idle

Idle bounces from 500 rpm to 1000rpm "only when in gear ". (but not every-time I put the vehicle in gear)

If I release the brake pedal while its doing the pulse thing, it will pull the vehicle along with a bouncy rhythm that matches the revs , up until I accelerate past 1000 rpm.

What Ive tried thus far : Cleaned MAF
Cleaned TB
Cleaned EGR pipe
Replaced TPS
Replaced IACV
Replaced EGRV
Replaced FPR
Replaced FPR vacuum line
Replaced Fuel filter
No dice yet !

Symptoms have progressed into idle hanging up at 2000 rpm after accelerating .
I recently unplugged the pressure switch for the power steering and have not had the Idle hang up again ...Yet .
The idle still continues to pulsate , only when in gear , but not all the time , and it happens more frequently when in reverse .

Intake manifold appears to be in good condition , I will be testing it for leaks .

What,where, else should I be looking ?

[VX crazy]

Vacuum line maybe??????? We get some weird problems, I wish everything had a specific code!

Pulsating Idle

Idle bounces from 500 rpm to 1000rpm "only when in gear ". (but not every-time I put the vehicle in gear)

If I release the brake pedal while its doing the pulse thing, it will pull the vehicle along with a bouncy rhythm that matches the revs , up until I accelerate past 1000 rpm.

What Ive tried thus far : Cleaned MAF
Cleaned TB
Cleaned EGR pipe
Replaced TPS
Replaced IACV
Replaced EGRV
Replaced FPR
Replaced Fuel filter
No dice yet !

Symptoms have progressed into idle hanging up at 2000 rpm after accelerating .
I recently unplugged the pressure switch for the power steering and have not had the Idle hang up again ...Yet .
The idle still continues to pulsate , only when in gear , but not all the time , and it happens more frequently when in reverse .

Intake manifold appears to be in good condition , I will be testing it for leaks .

What,where, else should I be looking ?

[djvx]

did you try to pull a code?

[tjh]

did you try to pull a code?

Yes, suposedly everything is hunky dory.

[blacksambo]

Spray carb cleaner around the common chamber gasket areas and see if the idle lifts. If so, cahnge those gaskets and torque to 13lbs, not 18lbs.

[Triathlete]

The above is a definate possibility. Also check your gas cap...although this usually only causes issues when warm.

[tjh]

Spray carb cleaner around the common chamber gasket areas and see if the idle lifts. If so, cahnge those gaskets and torque to 13lbs, not 18lbs.

Right O , next on my list . NOTE TO SELF : Purchase torque wrench .

The above is a definate possibility. Also check your gas cap...although this usually only causes issues when warm.

What am I checking for ?

Thank you for the leads .

[Triathlete]

Either not on tight or leaking (hard to check without a cap tester though.

[tjh]

Either not on tight or leaking (hard to check without a cap tester though.

I just made a google ! that's a pricey little gadget .

[tjh]

Still no relief for the VX idle problems . I have intake gaskets on order .
Yay! my first engine oil leak today . Where is it coming from ? .... I don't know .

[blacksambo]

Chechk the EGR valve. See if the tube is on tight at the EGR valve base, itself. Use a short handle 22mm to get it tight. Hope this helps, but you cannot go wrong with new common chamber gaskets, either.

[tjh]

Long over-due update . I replaced the battery terminals, and the idle problems have mostly disappeared .

[VXjunky]

when its pulsating ! i aint idle