[Ramage]

having a serious stalling problem on my 92 R/C 318 TBI
and a dumb question. it starts fine but as soon as I shift to drive it stalls. dumb question is could it be caused by the catalytic converter being clogged because it was steaming like crazy after i drove less than a mile.

 

[BigOlDodge]

i dont know if thats the problem but it aint right!

 

[TheRamChargerMan]

Well, a catalytic convertor will steam when it gets hot if it is wet from rain or snow. or from something leaking onto it.

Need more info to help you..it could be many things making it stall.

Does it rev ok in neutral ?
Does it stall or stumble if you leave it in park, idling, and mash the brake pedal to the floor ?
Have you tried putting it in gear at a slightly higher rpm ?
Does it make a dfference if it is drive or reverse ??
Is it a stumbling stall, or is it immediate ?
Does it do the same thing if the tcase is in neutral ? (if you try this, you will have to turn it off before putting it in back in gear)

 

[TaZMaNiaK]

Is the computer giving you any codes?

 

[Ramage]

it will stall as soon as i hit the brake to shift from park to drive if i start it in nuetral and shift to drive without braking it won't stall until i hit the brake. it used to stall occasionally when I wen't up a large hill without hitting the gas. sometimes at idle it will almost stall when in park but rpm will jump back up. i replaced the fuel pump relay a few weeks ago because it was clicking like crazy when trying to start when it's below freezing. the new relay still clicks. and it sounds like a machine gun when it starts then it will settle down to a normal idle.

 

[TheRamChargerMan]

ok..from what I am reading, you hit the brakes and it kills the engine.

You have a bad brake booster diaphragm and it is causing a major vacuum leak..

Try this...set the parking brake. disconnect the vacuum line from the brake booster and plug the line. put the truck in gear. Does it still die

vacuum assists inoperating the brakes. if the diaphragm goes bad, when you hit the brakes, engine vacuum all but goes away...and that is killing your engine.

 

[Ramage]

that sounds right because if i put my foot on the brake pedal for a long time i hear air escaping. but i never would have thought of that as the reason it was stalling thank you