90 Ranger 2.3 Stalls when in drive after hitting gas then brake as low speeds

[Johnnyboiranger22]

So I have a 90 Ranger 2.3 A4LD i noticed when I have truck in gear or reverse lightly tapping gas and then brake the struck "chokes like it want to stall till the point it actually stalls(no codes stored code 11 system ok). RPM drop 500 for a mili second and go back up. This only happens when coming to a stop otherwise truck drive and revs great. Vaccum? (I can duplicate if i hit brake pedal repeatabley), Fuel filter? IAC? Just some more information I did an engine swap and the engine i swapped in came with a EGR that i just plugged lines as mines does not have an EGR.

 

[RonD]

So in Park or Neutral it doesn't try to stall?

Maybe torque converter

 

[Johnnyboiranger22]

in park truck idles fine in neutral if i hit brake repeatably it chokes when in drive or reverse at barely creeping speeds it chokes more so if i hit brakes

 

[Trippy]

Have you tried replicating the problem with the brake booster hose capped? Could be a leaking brake booster. Are the brakes hard to push? Is there a hissing sound when hitting the brakes?

 

[Johnnyboiranger22]

Yes alot of air/hissing sound when hitting brake pedal but stops on a dime. Could I have vacuum line hooked up wrong?

 

[Trippy]

Try removing the hose from the brake booster and plugging it. Then set the car to drive with the parking brake engaged (so it wont move on you). Depress the brake pedal and see if there is any change to the condition.

 

[Johnnyboiranger22]

Will do! Going to try this tomorrow. Will keep you guys updated

 

[Johnnyboiranger22]

Will try the line tonight. Im starting to feel it is torque converter im going to try to get it up to overdrive and see if locks up

 

[Johnnyboiranger22]

So I tried disconnecting the brake booster and plugging line and what do you know it stop check in drive and reverse. I will try some other things before pinning on booster but it definitely idles fine in drive and reverse with booster disconnected. Thanks again guys!

 

[Bgunner]

Just an FYI any vacuum boosted break when depressed multiple times in a row will cause the idle speed to drop then rebound. Now it should not stall but it will drop then pick back up so after your tests and if you determine it is a vacuum booster that is bad be aware that after changing the booster what i just described, idle dropping low after consecutive presses to the brake, is normal but it should not stall.

 

[Johnnyboiranger22]

Hey guys Just providing an update,

Booster has been changed and Idle drop and stalling has been non existent as of now. even did some burnouts(probably should have but what the heck). Thanks again guys

 

[Bgunner]

Great to hear it and I'm glad there is another older ranger still on the road!

 

[Johnnyboiranger22]

Oh yes I fully rebuilt this thing from gorund up almost all new suspension,brakes new interior with dynamat insulation new carpet, speakers, trims. I even took most of cab off frame sanded down and re sprayed with rust preventive and replace most of body mounts. I probably spent 3 times worth the truck but at the end of the say it keeps me happy.