22RE Vacuum adjustment
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22RE Vacuum adjustment
My 89 p/u 22re will idle just fine when you're sitting still, but when you apply the brakes the engine idles fluctuate. I tried adjusting the vacuum screw next to the upper plenum but it didnt change any thing. When the engine gets warm, it gets worse. Im guessing this a vacuum leak but im new to yota's so it could be anything. Any ideas?
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what is your brake fluid level?
if it is low and there are no visible leaks than it could be collecting in the brake booster and getting into the vacuum line when the brake is applied.
could be a faulty air control valve.
or just as simple as a vacuum hose leak
if it is low and there are no visible leaks than it could be collecting in the brake booster and getting into the vacuum line when the brake is applied.
could be a faulty air control valve.
or just as simple as a vacuum hose leak
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My 89 p/u 22re will idle just fine when you're sitting still, but when you apply the brakes the engine idles fluctuate. I tried adjusting the vacuum screw next to the upper plenum but it didnt change any thing. When the engine gets warm, it gets worse. Im guessing this a vacuum leak but im new to yota's so it could be anything. Any ideas?
- http://www.4crawler.com/4x4/TLCA_Tru...ech.04.09.html
The adjustment screw on the intake only affects the fast idle speed when the A/C is on (assuming you have A/C installed).
#5
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i've noticed this problem when i've restarted a warm/hot engine that had been shut off only a short time. like running in for smokes. on restart, idle is higher than usual; step on brake pedal and it starts surging. let off, it stops.
does this sound more familiar?
my brakes aren't hard but seem like they require a lot of pressure to stop, but i'm comparing it to my go-kart honda civic so i chalked it up to 'old truck = press harder'
is this a bad booster? what's the current best upgrade/replacement?
does this sound more familiar?
my brakes aren't hard but seem like they require a lot of pressure to stop, but i'm comparing it to my go-kart honda civic so i chalked it up to 'old truck = press harder'
is this a bad booster? what's the current best upgrade/replacement?
#6
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Turn your idle speed down:
- http://www.4crawler.com/4x4/TLCA_Tru...ech.04.09.html
The adjustment screw on the intake only affects the fast idle speed when the A/C is on (assuming you have A/C installed).
- http://www.4crawler.com/4x4/TLCA_Tru...ech.04.09.html
The adjustment screw on the intake only affects the fast idle speed when the A/C is on (assuming you have A/C installed).
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i've noticed this problem when i've restarted a warm/hot engine that had been shut off only a short time. like running in for smokes. on restart, idle is higher than usual; step on brake pedal and it starts surging. let off, it stops.
does this sound more familiar?
my brakes aren't hard but seem like they require a lot of pressure to stop, but i'm comparing it to my go-kart honda civic so i chalked it up to 'old truck = press harder'
is this a bad booster? what's the current best upgrade/replacement?
does this sound more familiar?
my brakes aren't hard but seem like they require a lot of pressure to stop, but i'm comparing it to my go-kart honda civic so i chalked it up to 'old truck = press harder'
is this a bad booster? what's the current best upgrade/replacement?
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The only way to tell for 100% certain if it's the brake booster is to press a few times on the brake pedal with the motor off. Wait until there is a bit of pressure built up in the brake system and hold your foot on the brakes. With your foot keeping pressure on the brake pedal, turn your truck on. If the pedal goes down about half to 3/4 of the way to the floor then your booster is good. If your pedal stays where it's at or moves very little then your booster is bad.
You should have other symptoms of a bad booster as well. You may hear a hissing sound under your dash (vacuum leak in the booster). Your brake pedal will seem very hard to apply during normal conditions. Under idle conditions if you mash on the brakes the engine will idle rough and would want to die (like you're describing).
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i tried adjusting the idle and it worked for a while, then 10 minutes later it started doing it again. i checked the screw and it was in the same place i adjusted it to. should i check the brake booster now, or am i supposed to adjust something else?
#14
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First you got to figure out why it's idling too high or if in fact it is high. First check engine RPM at idle. And go from there. Anything you adjust is pointless till you figure out exactly what engine RPM is.
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Many timing lights has an RPM display or some digital multi-meters do as well:
- http://www.harborfreight.com/lcd-aut...kit-95670.html
- http://www.harborfreight.com/lcd-aut...kit-95670.html
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