dohc KA bogging/bucking at low rpms.

[dougal]

my 92 dohc KA bogs and bucks at low rpms when you are accelerating. almost wants to stall. i changed distributer, cap, roater, wires, plugs, 02 sensor, fuel filter, swapped the maf with another working one and i just put an old water temperature sensor in there. any ideas/help would be much appreciated. thanks .

[dougal]

no one? anyone? i hear it could be an egr valve? does this sound correct?

[skizsystem]

did you check all your vacuum lines?

[240sxrb25]

check vacuum limes and TPS

i had a vacuum line come loose from the EGR unit and it did this

[dougal]

im actually at the point where it wont run at all. but i heard somewhere if u spray carb cleaner around it can help u find ur vacuum leak. is that true? also could this be due to leaky injectors?

[spools420a]

test your maf sensor per FSM,Check for vacuum leaks by making a homade boost leak tester,This will work great for a vacuum leak tester and will even locate a leakey injector o ring since you seem to be leaning towards that being bad,Good luck.

[slothonaleash]

Spray carb cleaner around all your vacuum lines and on your vacuum lines. Look for bubbling, you've found yourself a vac leak. Or just listen for them. Something might be hissing under the engine bay. And it's likely not a snake.

[dougal]

alright, thank u guys so far for the advice. i have no clue hot to make a boost leak tester but i made some progress. i actually adjusted my timing with the distributer and the car will idlle and run now. but at low rpms it bogs and misses when driving.

could that be due to a vacuum leak, bad injectors, fucked up timing?

i pulled a wire off each plug, one at a time, whe the car was running and all of them made a difference. so i know the injectors are functioning, but how do i tell if they are failing slightly or randomly when under load? lol thanx alot guys. ill hopefully be able to get to work reliably again.

[dougal]

and unfortunately i didnt find any snakes.... that would have made up for my car being an asshole whe its 3 degrees out! HAHA