Please help 93 engine shaking violently
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New User
Joined: Jan 2019
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Please help 93 engine shaking violently
The truck in park or neutral will idle vut will run very rough if you give it gas it'll shake the whole truck to the point it knocked off the muffler if you put it in drive or reverse it'll shake even more violently and will try to dive if you don't keep it runing and if you drive it even tho it is shaking it has like no power
Lead Driver
Joined: Jul 2017
Posts: 9,591
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From: San Jose, CA
Will it idle enough that you can let go of the throttle pedal and go under the hood and check for vacuum leaks? Usually with some sort of fluid-spray to check around the engine.
But if it's running that bad and did have something to do with a vacuum leak, it'd be a pretty bad one I think. Like a big 3/8" or larger hose has failed or popped off it's fitting. Not sure what we have under our upper intake plenums, but on the car 5.0's there are quite a few out of sight underneath. If the hose has fallen off, it would create a big leak.
No way to know for sure if that's an issue with yours until you test. But it's at least one possibility.
Do you have a 5.0 or 5.8 engine? Or a 4.9 perhaps if they were available in '93?
Are you familiar with how to give a quick cursory check for vacuum leaks? If not, let us know and we can run down our various methods and materials.
Good luck.
Paul
But if it's running that bad and did have something to do with a vacuum leak, it'd be a pretty bad one I think. Like a big 3/8" or larger hose has failed or popped off it's fitting. Not sure what we have under our upper intake plenums, but on the car 5.0's there are quite a few out of sight underneath. If the hose has fallen off, it would create a big leak.
No way to know for sure if that's an issue with yours until you test. But it's at least one possibility.
Do you have a 5.0 or 5.8 engine? Or a 4.9 perhaps if they were available in '93?
Are you familiar with how to give a quick cursory check for vacuum leaks? If not, let us know and we can run down our various methods and materials.
Good luck.
Paul
Thread Starter
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New User
Joined: Jan 2019
Posts: 3
Likes: 0
Will it idle enough that you can let go of the throttle pedal and go under the hood and check for vacuum leaks? Usually with some sort of fluid-spray to check around the engine.
But if it's running that bad and did have something to do with a vacuum leak, it'd be a pretty bad one I think. Like a big 3/8" or larger hose has failed or popped off it's fitting. Not sure what we have under our upper intake plenums, but on the car 5.0's there are quite a few out of sight underneath. If the hose has fallen off, it would create a big leak.
No way to know for sure if that's an issue with yours until you test. But it's at least one possibility.
Do you have a 5.0 or 5.8 engine? Or a 4.9 perhaps if they were available in '93?
Are you familiar with how to give a quick cursory check for vacuum leaks? If not, let us know and we can run down our various methods and materials.
Good luck.
Paul
But if it's running that bad and did have something to do with a vacuum leak, it'd be a pretty bad one I think. Like a big 3/8" or larger hose has failed or popped off it's fitting. Not sure what we have under our upper intake plenums, but on the car 5.0's there are quite a few out of sight underneath. If the hose has fallen off, it would create a big leak.
No way to know for sure if that's an issue with yours until you test. But it's at least one possibility.
Do you have a 5.0 or 5.8 engine? Or a 4.9 perhaps if they were available in '93?
Are you familiar with how to give a quick cursory check for vacuum leaks? If not, let us know and we can run down our various methods and materials.
Good luck.
Paul
More Turbo
Joined: Mar 2018
Posts: 635
Likes: 16
Injector harness ok? Any recent work? Have you pulled distributor cap and checked for cracks or damaged rotor? Fuel pressure ok? I had an 89 with 5.0 that I thought bought the farm. Ended up being a bad fuel pressure regulator on the fuel rail. It was dumping gas into the vacuum side. You can pull vac line off of it to check. If there's gas in coming out the vac port you need a new regulator.
I guess a question that should be asked,. Did this happen suddenly or has it been running like crap all along just getting worse to the point you are at now?
I guess a question that should be asked,. Did this happen suddenly or has it been running like crap all along just getting worse to the point you are at now?
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New User
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Injector harness ok? Any recent work? Have you pulled distributor cap and checked for cracks or damaged rotor? Fuel pressure ok? I had an 89 with 5.0 that I thought bought the farm. Ended up being a bad fuel pressure regulator on the fuel rail. It was dumping gas into the vacuum side. You can pull vac line off of it to check. If there's gas in coming out the vac port you need a new regulator.
I guess a question that should be asked,. Did this happen suddenly or has it been running like crap all along just getting worse to the point you are at now?
I guess a question that should be asked,. Did this happen suddenly or has it been running like crap all along just getting worse to the point you are at now?
More Turbo
Joined: Mar 2018
Posts: 635
Likes: 16
I'd start simple then. Pull distributor cap off, make sure cap and rotor are good. Dirty contacts won't cause a sudden issue, you're looking for a bigger issue. Broken rotor or something like that. Damage to the cap.
Then while your there check that fuel regulator, it's on back end of the fuel rail, little round thing with vac hose coming out the end. Just see if there's gas in the vacuum line. It's probably fine if it's dry.
If that stuff is good maybe check the fuel pressure. These efi trucks run like crap if they aren't fed right. I'm not sure the psi you need but it's easy enough to find out.
Plus someone mentioned before getting codes out of it. Don't get nervous if there's a few codes. Sometimes one thing causes more than 1 code to flag.
At least this stuff is all fast to check and rule out. Good luck!
Then while your there check that fuel regulator, it's on back end of the fuel rail, little round thing with vac hose coming out the end. Just see if there's gas in the vacuum line. It's probably fine if it's dry.
If that stuff is good maybe check the fuel pressure. These efi trucks run like crap if they aren't fed right. I'm not sure the psi you need but it's easy enough to find out.
Plus someone mentioned before getting codes out of it. Don't get nervous if there's a few codes. Sometimes one thing causes more than 1 code to flag.
At least this stuff is all fast to check and rule out. Good luck!
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Senior User
Joined: Jun 2019
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From: nw arkansas
I've got a 94 5.8, it started out slowly losing power and shaking bad and it has a standard so it was magnified then it started acting like it jumped time and backfiring. I replaced a lot of stiff cause I don't have stuff to diagnose [problems with then I was looking at the distributor and the plastic broke holding the timing advance and it sheared some ears off the meatal piece down in the bottom so it was getting mixed signals on when to fire I bought a new distributor and it ran perfect. not sure if its what's wrong with yours but that's kind of how mine started out
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