engine violently dies under hard braking?
04-30-2009, 11:55 AM
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engine violently dies under hard braking?
hey guys, been lurking around here for a while now, and i finally picked up a 87 4runner with a 22re a couple weeks ago.
i tried searching but was unsure, but the answer is still a little grey.
its developed a condition where under heavy braking, usually just downhill, the steering wheel will start to shake and the engine itself will shake violently, and the truck will die. this leaves me with stopping and steering the truck without power brakes or steering. vacuum leak?
any help is appreciated, thanks.
i tried searching but was unsure, but the answer is still a little grey.
its developed a condition where under heavy braking, usually just downhill, the steering wheel will start to shake and the engine itself will shake violently, and the truck will die. this leaves me with stopping and steering the truck without power brakes or steering. vacuum leak?
any help is appreciated, thanks.
04-30-2009, 10:42 PM
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take the truck out of gear 
if you have an auto, it would probably be a problem with the transmission
if you don't, that's very odd, as the wheels are directly connected to the engine only via the driveshaft, and in neutral / with clutch engaged, the engine should be essentially idling.
if you have an auto, it would probably be a problem with the transmission
if you don't, that's very odd, as the wheels are directly connected to the engine only via the driveshaft, and in neutral / with clutch engaged, the engine should be essentially idling.
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04-30-2009, 10:52 PM
#8
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It's possible you have a failed brake booster.
Try to replicate the condition with the vehicle idling (stopped) push the brake hard and see if it idles rough. Then plug the brake vacuum hose and see if it still does it.
Try to replicate the condition with the vehicle idling (stopped) push the brake hard and see if it idles rough. Then plug the brake vacuum hose and see if it still does it.
04-30-2009, 10:58 PM
#9
Don't think that's possible to get a truck to vibrate enough to stall just by driving (no matter what the road). My truck rolled and kept running, and I've drive down some BRUTALLY bumpy roads at very high speeds and the engine couldn't have cared less.
04-30-2009, 11:07 PM
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that would be a mythbusters test right there. my 22re is a tank, you couldn't kill it if you tried (that is until you got the timing chain xD)
05-01-2009, 08:23 AM
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take the truck out of gear
if you have an auto, it would probably be a problem with the transmission
if you don't, that's very odd, as the wheels are directly connected to the engine only via the driveshaft, and in neutral / with clutch engaged, the engine should be essentially idling.
if you have an auto, it would probably be a problem with the transmission
if you don't, that's very odd, as the wheels are directly connected to the engine only via the driveshaft, and in neutral / with clutch engaged, the engine should be essentially idling.
i forgot to mention, its a five speed, but the weird thing is it happens more in neutral than when the truck is in gear
05-01-2009, 09:49 AM
#12
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So if you're cruising along and drop the rig into neutral and slam on the brakes the front end will shake like crazy (felt at the steering wheel) and the engine will die?
Crap that's like saying my wife walked across the kitchen, slipped on a banana peel and got pregnant....... There seem to be several causes for differing things that don't seem to add up.
1) Check the rotors for warping. This may be the cause of the front end, and thus steering wheel, shaking like mad.
2) Check the vac system starting with the brake booster and the PCV valve. Let the rig idle in neutral, have someone push down on the brake pedal while you are looking under the hood and listening for any "odd" noises like a vacuum leak.
3) I have no idea what #3 should be.....
I'll do some looking and see what else I can come up with.
Crap that's like saying my wife walked across the kitchen, slipped on a banana peel and got pregnant....... There seem to be several causes for differing things that don't seem to add up.
1) Check the rotors for warping. This may be the cause of the front end, and thus steering wheel, shaking like mad.
2) Check the vac system starting with the brake booster and the PCV valve. Let the rig idle in neutral, have someone push down on the brake pedal while you are looking under the hood and listening for any "odd" noises like a vacuum leak.
3) I have no idea what #3 should be.....
I'll do some looking and see what else I can come up with.
05-01-2009, 11:25 PM
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05-02-2009, 11:41 AM
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05-02-2009, 12:43 PM
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what i mean is do you come to a complete stop, with the transmission in gear, and your foot off the clutch pedal? because that'll stall anything with a manual tranny
05-02-2009, 03:21 PM
#20
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